diff options
Diffstat (limited to 'Help/guide')
122 files changed, 3521 insertions, 0 deletions
diff --git a/Help/guide/tutorial/Complete/CMakeLists.txt b/Help/guide/tutorial/Complete/CMakeLists.txt new file mode 100644 index 0000000..1c97545 --- /dev/null +++ b/Help/guide/tutorial/Complete/CMakeLists.txt @@ -0,0 +1,115 @@ +cmake_minimum_required(VERSION 3.3) +project(Tutorial) + +# control where the static and shared libraries are built so that on windows +# we don't need to tinker with the path to run the executable +set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") +set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") +set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") + +set(CMAKE_CXX_STANDARD 14) + +option(BUILD_SHARED_LIBS "Build using shared libraries" ON) + +# the version number. +set(Tutorial_VERSION_MAJOR 1) +set(Tutorial_VERSION_MINOR 0) + +if(APPLE) + set(CMAKE_INSTALL_RPATH "@executable_path/../lib") +elseif(UNIX) + set(CMAKE_INSTALL_RPATH "$ORIGIN/../lib") +endif() + +# configure a header file to pass the version number only +configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + +# add the MathFunctions library +add_subdirectory(MathFunctions) + +# add the executable +add_executable(Tutorial tutorial.cxx) +target_link_libraries(Tutorial MathFunctions) + +# add the binary tree to the search path for include files +# so that we will find TutorialConfig.h +target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ) + +# add the install targets +install(TARGETS Tutorial DESTINATION bin) +install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h" + DESTINATION include + ) + +# enable testing +enable_testing() + +# does the application run +add_test(NAME Runs COMMAND Tutorial 25) + +# does the usage message work? +add_test(NAME Usage COMMAND Tutorial) +set_tests_properties(Usage + PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number" + ) + +# define a function to simplify adding tests +function(do_test target arg result) + add_test(NAME Comp${arg} COMMAND ${target} ${arg}) + set_tests_properties(Comp${arg} + PROPERTIES PASS_REGULAR_EXPRESSION ${result} + ) +endfunction(do_test) + +# do a bunch of result based tests +do_test(Tutorial 4 "4 is 2") +do_test(Tutorial 9 "9 is 3") +do_test(Tutorial 5 "5 is 2.236") +do_test(Tutorial 7 "7 is 2.645") +do_test(Tutorial 25 "25 is 5") +do_test(Tutorial -25 "-25 is [-nan|nan|0]") +do_test(Tutorial 0.0001 "0.0001 is 0.01") + +include(InstallRequiredSystemLibraries) +set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/License.txt") +set(CPACK_PACKAGE_VERSION_MAJOR "${Tutorial_VERSION_MAJOR}") +set(CPACK_PACKAGE_VERSION_MINOR "${Tutorial_VERSION_MINOR}") +include(CPack) + +# install the configuration targets +install(EXPORT MathFunctionsTargets + FILE MathFunctionsTargets.cmake + DESTINATION lib/cmake/MathFunctions +) + +include(CMakePackageConfigHelpers) +# generate the config file that is includes the exports +configure_package_config_file(${CMAKE_CURRENT_SOURCE_DIR}/Config.cmake.in + "${CMAKE_CURRENT_BINARY_DIR}/MathFunctionsConfig.cmake" + INSTALL_DESTINATION "lib/cmake/example" + NO_SET_AND_CHECK_MACRO + NO_CHECK_REQUIRED_COMPONENTS_MACRO + ) +# generate the version file for the config file +write_basic_package_version_file( + "${CMAKE_CURRENT_BINARY_DIR}/MathFunctionsConfigVersion.cmake" + VERSION "${Tutorial_VERSION_MAJOR}.${Tutorial_VERSION_MINOR}" + COMPATIBILITY AnyNewerVersion +) + +# install the configuration file +install(FILES + ${CMAKE_CURRENT_BINARY_DIR}/MathFunctionsConfig.cmake + DESTINATION lib/cmake/MathFunctions + ) + +# generate the export targets for the build tree +# needs to be after the install(TARGETS ) command +export(EXPORT MathFunctionsTargets + FILE "${CMAKE_CURRENT_BINARY_DIR}/MathFunctionsTargets.cmake" +) diff --git a/Help/guide/tutorial/Complete/Config.cmake.in b/Help/guide/tutorial/Complete/Config.cmake.in new file mode 100644 index 0000000..17cbabd --- /dev/null +++ b/Help/guide/tutorial/Complete/Config.cmake.in @@ -0,0 +1,4 @@ + +@PACKAGE_INIT@ + +include ( "${CMAKE_CURRENT_LIST_DIR}/MathFunctionsTargets.cmake" ) diff --git a/Help/guide/tutorial/Complete/License.txt b/Help/guide/tutorial/Complete/License.txt new file mode 100644 index 0000000..c62d00b --- /dev/null +++ b/Help/guide/tutorial/Complete/License.txt @@ -0,0 +1,2 @@ +This is the open source License.txt file introduced in +CMake/Tutorial/Step7... diff --git a/Help/guide/tutorial/Complete/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Complete/MathFunctions/CMakeLists.txt new file mode 100644 index 0000000..161ad64 --- /dev/null +++ b/Help/guide/tutorial/Complete/MathFunctions/CMakeLists.txt @@ -0,0 +1,68 @@ + +# add the library that runs +add_library(MathFunctions MathFunctions.cxx) + +# state that anybody linking to us needs to include the current source dir +# to find MathFunctions.h, while we don't. +target_include_directories(MathFunctions + INTERFACE + $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}> + $<INSTALL_INTERFACE:include> + ) + +# should we use our own math functions +option(USE_MYMATH "Use tutorial provided math implementation" ON) +if(USE_MYMATH) + + # does this system provide the log and exp functions? + include(CheckSymbolExists) + set(CMAKE_REQUIRED_LIBRARIES "m") + check_symbol_exists(log "math.h" HAVE_LOG) + check_symbol_exists(exp "math.h" HAVE_EXP) + + # first we add the executable that generates the table + add_executable(MakeTable MakeTable.cxx) + + # add the command to generate the source code + add_custom_command( + OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h + COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h + DEPENDS MakeTable + ) + + # library that just does sqrt + add_library(SqrtLibrary STATIC + mysqrt.cxx + ${CMAKE_CURRENT_BINARY_DIR}/Table.h + ) + + # state that we depend on our binary dir to find Table.h + target_include_directories(SqrtLibrary PRIVATE + ${CMAKE_CURRENT_BINARY_DIR} + ) + + set_target_properties(SqrtLibrary PROPERTIES + POSITION_INDEPENDENT_CODE ${BUILD_SHARED_LIBS} + ) + + target_compile_definitions(SqrtLibrary PRIVATE + "$<$<BOOL:${HAVE_LOG}>:HAVE_LOG>" + "$<$<BOOL:${HAVE_EXP}>:HAVE_EXP>" + ) + target_link_libraries(MathFunctions PRIVATE SqrtLibrary) +endif() + +target_compile_definitions(MathFunctions PRIVATE "$<$<BOOL:${USE_MYMATH}>:USE_MYMATH>") + +# define the symbol stating we are using the declspec(dllexport) when +# building on windows +target_compile_definitions(MathFunctions PRIVATE "EXPORTING_MYMATH") + +# setup the version numbering +set_property(TARGET MathFunctions PROPERTY VERSION "1.0.0") +set_property(TARGET MathFunctions PROPERTY SOVERSION "1") + +install(TARGETS MathFunctions + DESTINATION lib + EXPORT MathFunctionsTargets) +install(FILES MathFunctions.h DESTINATION include) diff --git a/Help/guide/tutorial/Complete/MathFunctions/MakeTable.cxx b/Help/guide/tutorial/Complete/MathFunctions/MakeTable.cxx new file mode 100644 index 0000000..ee58556 --- /dev/null +++ b/Help/guide/tutorial/Complete/MathFunctions/MakeTable.cxx @@ -0,0 +1,25 @@ +// A simple program that builds a sqrt table +#include <cmath> +#include <fstream> +#include <iostream> + +int main(int argc, char* argv[]) +{ + // make sure we have enough arguments + if (argc < 2) { + return 1; + } + + std::ofstream fout(argv[1], std::ios_base::out); + const bool fileOpen = fout.is_open(); + if (fileOpen) { + fout << "double sqrtTable[] = {" << std::endl; + for (int i = 0; i < 10; ++i) { + fout << sqrt(static_cast<double>(i)) << "," << std::endl; + } + // close the table with a zero + fout << "0};" << std::endl; + fout.close(); + } + return fileOpen ? 0 : 1; // return 0 if wrote the file +} diff --git a/Help/guide/tutorial/Complete/MathFunctions/MathFunctions.cxx b/Help/guide/tutorial/Complete/MathFunctions/MathFunctions.cxx new file mode 100644 index 0000000..5351184 --- /dev/null +++ b/Help/guide/tutorial/Complete/MathFunctions/MathFunctions.cxx @@ -0,0 +1,18 @@ + +#include "MathFunctions.h" +#include <cmath> + +#ifdef USE_MYMATH +# include "mysqrt.h" +#endif + +namespace mathfunctions { +double sqrt(double x) +{ +#ifdef USE_MYMATH + return detail::mysqrt(x); +#else + return std::sqrt(x); +#endif +} +} diff --git a/Help/guide/tutorial/Complete/MathFunctions/MathFunctions.h b/Help/guide/tutorial/Complete/MathFunctions/MathFunctions.h new file mode 100644 index 0000000..3fb547b --- /dev/null +++ b/Help/guide/tutorial/Complete/MathFunctions/MathFunctions.h @@ -0,0 +1,14 @@ + +#if defined(_WIN32) +# if defined(EXPORTING_MYMATH) +# define DECLSPEC __declspec(dllexport) +# else +# define DECLSPEC __declspec(dllimport) +# endif +#else // non windows +# define DECLSPEC +#endif + +namespace mathfunctions { +double DECLSPEC sqrt(double x); +} diff --git a/Help/guide/tutorial/Complete/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Complete/MathFunctions/mysqrt.cxx new file mode 100644 index 0000000..96d9421 --- /dev/null +++ b/Help/guide/tutorial/Complete/MathFunctions/mysqrt.cxx @@ -0,0 +1,45 @@ +#include "MathFunctions.h" +#include <iostream> + +// include the generated table +#include "Table.h" + +#include <cmath> + +namespace mathfunctions { +namespace detail { +// a hack square root calculation using simple operations +double mysqrt(double x) +{ + if (x <= 0) { + return 0; + } + + // if we have both log and exp then use them +#if defined(HAVE_LOG) && defined(HAVE_EXP) + double result = exp(log(x) * 0.5); + std::cout << "Computing sqrt of " << x << " to be " << result << " using log" + << std::endl; +#else + // use the table to help find an initial value + double result = x; + if (x >= 1 && x < 10) { + result = sqrtTable[static_cast<int>(x)]; + } + + // if we have both log and exp then use them + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result * result); + result = result + 0.5 * delta / result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } +#endif + return result; +} +} +} diff --git a/Help/guide/tutorial/Complete/MathFunctions/mysqrt.h b/Help/guide/tutorial/Complete/MathFunctions/mysqrt.h new file mode 100644 index 0000000..e1c42ef --- /dev/null +++ b/Help/guide/tutorial/Complete/MathFunctions/mysqrt.h @@ -0,0 +1,6 @@ + +namespace mathfunctions { +namespace detail { +double mysqrt(double x); +} +} diff --git a/Help/guide/tutorial/Complete/TutorialConfig.h.in b/Help/guide/tutorial/Complete/TutorialConfig.h.in new file mode 100644 index 0000000..8cd2fc9 --- /dev/null +++ b/Help/guide/tutorial/Complete/TutorialConfig.h.in @@ -0,0 +1,3 @@ +// the configured version number +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ diff --git a/Help/guide/tutorial/Complete/tutorial.cxx b/Help/guide/tutorial/Complete/tutorial.cxx new file mode 100644 index 0000000..4451cbd --- /dev/null +++ b/Help/guide/tutorial/Complete/tutorial.cxx @@ -0,0 +1,25 @@ +// A simple program that computes the square root of a number +#include <iostream> +#include <sstream> +#include <string> + +#include "MathFunctions.h" +#include "TutorialConfig.h" + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "." + << Tutorial_VERSION_MINOR << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = std::stod(argv[1]); + + const double outputValue = mathfunctions::sqrt(inputValue); + + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} diff --git a/Help/guide/tutorial/Consumer/CMakeLists.txt b/Help/guide/tutorial/Consumer/CMakeLists.txt new file mode 100644 index 0000000..5097917 --- /dev/null +++ b/Help/guide/tutorial/Consumer/CMakeLists.txt @@ -0,0 +1,50 @@ +cmake_minimum_required(VERSION 3.3) + +if(NOT DEFINED CMAKE_CXX_STANDARD) + set(CMAKE_CXX_STANDARD 14) +endif() + + +function(find_external_dependency name) + set(${name}_ROOT "" CACHE PATH "Root directory to find ${name}") + mark_as_advanced(${name}_DIR) + find_package(${name} PATHS ${${name}_ROOT} REQUIRED) +endfunction() + + +project(Consumer) + +find_external_dependency(MathFunctions) + +add_library(consumer consumer.cxx) +target_link_libraries(consumer PUBLIC MathFunctions) + +# install the consumer library +install(TARGETS consumer DESTINATION bin EXPORT ConsumerTargets) + +# install the configuration targets +install(EXPORT ConsumerTargets + FILE ConsumerTargets.cmake + DESTINATION lib/cmake/Consumer +) + +include(CMakePackageConfigHelpers) +# generate the config file that is includes the exports +configure_package_config_file(${CMAKE_CURRENT_SOURCE_DIR}/Config.cmake.in + "${CMAKE_CURRENT_BINARY_DIR}/ConsumerConfig.cmake" + INSTALL_DESTINATION "lib/cmake/example" + NO_SET_AND_CHECK_MACRO + NO_CHECK_REQUIRED_COMPONENTS_MACRO + ) + +# install the configuration file +install(FILES + ${CMAKE_CURRENT_BINARY_DIR}/ConsumerConfig.cmake + DESTINATION lib/cmake/Consumer + ) + +# generate the export targets for the build tree +# needs to be after the install(TARGETS ) command +export(EXPORT ConsumerTargets + FILE "${CMAKE_CURRENT_BINARY_DIR}/ConsumerTargets.cmake" +) diff --git a/Help/guide/tutorial/Consumer/Config.cmake.in b/Help/guide/tutorial/Consumer/Config.cmake.in new file mode 100644 index 0000000..0b3f1e4 --- /dev/null +++ b/Help/guide/tutorial/Consumer/Config.cmake.in @@ -0,0 +1,14 @@ + +@PACKAGE_INIT@ + +include(CMakeFindDependencyMacro) + +function(find_external_dependency name) + set(${name}_ROOT "" CACHE PATH "Root directory to find ${name}") + mark_as_advanced(${name}_DIR) + find_dependency(${name} PATHS ${${name}_ROOT} REQUIRED) +endfunction() + +find_external_dependency(MathFunctions) + +include ( "${CMAKE_CURRENT_LIST_DIR}/ConsumerTargets.cmake" ) diff --git a/Help/guide/tutorial/Consumer/consumer.cxx b/Help/guide/tutorial/Consumer/consumer.cxx new file mode 100644 index 0000000..ae7877b --- /dev/null +++ b/Help/guide/tutorial/Consumer/consumer.cxx @@ -0,0 +1,11 @@ +// A simple function that computes the square root of a number +#include <iostream> +#include <sstream> +#include <string> + +#include "MathFunctions.h" + +double string_square_root(std::string const& value) +{ + return mathfunctions::sqrt(std::stod(value)); +} diff --git a/Help/guide/tutorial/Consumer/directions.txt b/Help/guide/tutorial/Consumer/directions.txt new file mode 100644 index 0000000..6a70aab --- /dev/null +++ b/Help/guide/tutorial/Consumer/directions.txt @@ -0,0 +1,6 @@ +# Import a CMake Project# + +This examples shows how a project can find other CMake packages that +generated Config.cmake files. + +It also shows how to state a projects external dependencies when generating a Config.cmake. diff --git a/Help/guide/tutorial/MultiPackage/CMakeLists.txt b/Help/guide/tutorial/MultiPackage/CMakeLists.txt new file mode 100644 index 0000000..067e807 --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/CMakeLists.txt @@ -0,0 +1,109 @@ +cmake_minimum_required(VERSION 3.3) +project(Tutorial) + +# control how we mark up Debug libraries compared to Release libraries +set(CMAKE_DEBUG_POSTFIX "-d") + +# control where the static and shared libraries are built so that on windows +# we don't need to tinker with the path to run the executable +set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") +set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") + +option(BUILD_SHARED_LIBS "Build using shared libraries" ON) + +# the version number. +set(Tutorial_VERSION_MAJOR 1) +set(Tutorial_VERSION_MINOR 0) + +# configure a header file to pass the version number only +configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + +# add the MathFunctions library +add_subdirectory(MathFunctions) + +# add the executable +add_executable(Tutorial tutorial.cxx) +target_link_libraries(Tutorial MathFunctions) + +# add the binary tree to the search path for include files +# so that we will find TutorialConfig.h +target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ) + +# add the install targets +install(TARGETS Tutorial DESTINATION bin) +install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h" + DESTINATION include + ) + +# enable testing +enable_testing() + +# does the application run +add_test(NAME Runs COMMAND Tutorial 25) + +# does the usage message work? +add_test(NAME Usage COMMAND Tutorial) +set_tests_properties(Usage + PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number" + ) + +# define a function to simplify adding tests +function(do_test target arg result) + add_test(NAME Comp${arg} COMMAND ${target} ${arg}) + set_tests_properties(Comp${arg} + PROPERTIES PASS_REGULAR_EXPRESSION ${result} + ) +endfunction(do_test) + +# do a bunch of result based tests +do_test(Tutorial 4 "4 is 2") +do_test(Tutorial 9 "9 is 3") +do_test(Tutorial 5 "5 is 2.236") +do_test(Tutorial 7 "7 is 2.645") +do_test(Tutorial 25 "25 is 5") +do_test(Tutorial -25 "-25 is [-nan|nan|0]") +do_test(Tutorial 0.0001 "0.0001 is 0.01") + +include(InstallRequiredSystemLibraries) +set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/License.txt") +set(CPACK_PACKAGE_VERSION_MAJOR "${Tutorial_VERSION_MAJOR}") +set(CPACK_PACKAGE_VERSION_MINOR "${Tutorial_VERSION_MINOR}") +include(CPack) + +# install the configuration targets +install(EXPORT MathFunctionsTargets + FILE MathFunctionsTargets.cmake + DESTINATION lib/cmake/MathFunctions +) + +include(CMakePackageConfigHelpers) +# generate the config file that is includes the exports +configure_package_config_file(${CMAKE_CURRENT_SOURCE_DIR}/Config.cmake.in + "${CMAKE_CURRENT_BINARY_DIR}/MathFunctionsConfig.cmake" + INSTALL_DESTINATION "lib/cmake/example" + NO_SET_AND_CHECK_MACRO + NO_CHECK_REQUIRED_COMPONENTS_MACRO + ) +# generate the version file for the config file +write_basic_package_version_file( + "${CMAKE_CURRENT_BINARY_DIR}/MathFunctionsConfigVersion.cmake" + VERSION "${Tutorial_VERSION_MAJOR}.${Tutorial_VERSION_MINOR}" + COMPATIBILITY AnyNewerVersion +) + +# install the configuration file +install(FILES + ${CMAKE_CURRENT_BINARY_DIR}/MathFunctionsConfig.cmake + DESTINATION lib/cmake/MathFunctions + ) + +# generate the export targets for the build tree +# needs to be after the install(TARGETS ) command +export(EXPORT MathFunctionsTargets + FILE "${CMAKE_CURRENT_BINARY_DIR}/MathFunctionsTargets.cmake" +) diff --git a/Help/guide/tutorial/MultiPackage/Config.cmake.in b/Help/guide/tutorial/MultiPackage/Config.cmake.in new file mode 100644 index 0000000..17cbabd --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/Config.cmake.in @@ -0,0 +1,4 @@ + +@PACKAGE_INIT@ + +include ( "${CMAKE_CURRENT_LIST_DIR}/MathFunctionsTargets.cmake" ) diff --git a/Help/guide/tutorial/MultiPackage/License.txt b/Help/guide/tutorial/MultiPackage/License.txt new file mode 100644 index 0000000..c62d00b --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/License.txt @@ -0,0 +1,2 @@ +This is the open source License.txt file introduced in +CMake/Tutorial/Step7... diff --git a/Help/guide/tutorial/MultiPackage/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/MultiPackage/MathFunctions/CMakeLists.txt new file mode 100644 index 0000000..161ad64 --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/MathFunctions/CMakeLists.txt @@ -0,0 +1,68 @@ + +# add the library that runs +add_library(MathFunctions MathFunctions.cxx) + +# state that anybody linking to us needs to include the current source dir +# to find MathFunctions.h, while we don't. +target_include_directories(MathFunctions + INTERFACE + $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}> + $<INSTALL_INTERFACE:include> + ) + +# should we use our own math functions +option(USE_MYMATH "Use tutorial provided math implementation" ON) +if(USE_MYMATH) + + # does this system provide the log and exp functions? + include(CheckSymbolExists) + set(CMAKE_REQUIRED_LIBRARIES "m") + check_symbol_exists(log "math.h" HAVE_LOG) + check_symbol_exists(exp "math.h" HAVE_EXP) + + # first we add the executable that generates the table + add_executable(MakeTable MakeTable.cxx) + + # add the command to generate the source code + add_custom_command( + OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h + COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h + DEPENDS MakeTable + ) + + # library that just does sqrt + add_library(SqrtLibrary STATIC + mysqrt.cxx + ${CMAKE_CURRENT_BINARY_DIR}/Table.h + ) + + # state that we depend on our binary dir to find Table.h + target_include_directories(SqrtLibrary PRIVATE + ${CMAKE_CURRENT_BINARY_DIR} + ) + + set_target_properties(SqrtLibrary PROPERTIES + POSITION_INDEPENDENT_CODE ${BUILD_SHARED_LIBS} + ) + + target_compile_definitions(SqrtLibrary PRIVATE + "$<$<BOOL:${HAVE_LOG}>:HAVE_LOG>" + "$<$<BOOL:${HAVE_EXP}>:HAVE_EXP>" + ) + target_link_libraries(MathFunctions PRIVATE SqrtLibrary) +endif() + +target_compile_definitions(MathFunctions PRIVATE "$<$<BOOL:${USE_MYMATH}>:USE_MYMATH>") + +# define the symbol stating we are using the declspec(dllexport) when +# building on windows +target_compile_definitions(MathFunctions PRIVATE "EXPORTING_MYMATH") + +# setup the version numbering +set_property(TARGET MathFunctions PROPERTY VERSION "1.0.0") +set_property(TARGET MathFunctions PROPERTY SOVERSION "1") + +install(TARGETS MathFunctions + DESTINATION lib + EXPORT MathFunctionsTargets) +install(FILES MathFunctions.h DESTINATION include) diff --git a/Help/guide/tutorial/MultiPackage/MathFunctions/MakeTable.cxx b/Help/guide/tutorial/MultiPackage/MathFunctions/MakeTable.cxx new file mode 100644 index 0000000..ee58556 --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/MathFunctions/MakeTable.cxx @@ -0,0 +1,25 @@ +// A simple program that builds a sqrt table +#include <cmath> +#include <fstream> +#include <iostream> + +int main(int argc, char* argv[]) +{ + // make sure we have enough arguments + if (argc < 2) { + return 1; + } + + std::ofstream fout(argv[1], std::ios_base::out); + const bool fileOpen = fout.is_open(); + if (fileOpen) { + fout << "double sqrtTable[] = {" << std::endl; + for (int i = 0; i < 10; ++i) { + fout << sqrt(static_cast<double>(i)) << "," << std::endl; + } + // close the table with a zero + fout << "0};" << std::endl; + fout.close(); + } + return fileOpen ? 0 : 1; // return 0 if wrote the file +} diff --git a/Help/guide/tutorial/MultiPackage/MathFunctions/MathFunctions.cxx b/Help/guide/tutorial/MultiPackage/MathFunctions/MathFunctions.cxx new file mode 100644 index 0000000..5351184 --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/MathFunctions/MathFunctions.cxx @@ -0,0 +1,18 @@ + +#include "MathFunctions.h" +#include <cmath> + +#ifdef USE_MYMATH +# include "mysqrt.h" +#endif + +namespace mathfunctions { +double sqrt(double x) +{ +#ifdef USE_MYMATH + return detail::mysqrt(x); +#else + return std::sqrt(x); +#endif +} +} diff --git a/Help/guide/tutorial/MultiPackage/MathFunctions/MathFunctions.h b/Help/guide/tutorial/MultiPackage/MathFunctions/MathFunctions.h new file mode 100644 index 0000000..3fb547b --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/MathFunctions/MathFunctions.h @@ -0,0 +1,14 @@ + +#if defined(_WIN32) +# if defined(EXPORTING_MYMATH) +# define DECLSPEC __declspec(dllexport) +# else +# define DECLSPEC __declspec(dllimport) +# endif +#else // non windows +# define DECLSPEC +#endif + +namespace mathfunctions { +double DECLSPEC sqrt(double x); +} diff --git a/Help/guide/tutorial/MultiPackage/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/MultiPackage/MathFunctions/mysqrt.cxx new file mode 100644 index 0000000..96d9421 --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/MathFunctions/mysqrt.cxx @@ -0,0 +1,45 @@ +#include "MathFunctions.h" +#include <iostream> + +// include the generated table +#include "Table.h" + +#include <cmath> + +namespace mathfunctions { +namespace detail { +// a hack square root calculation using simple operations +double mysqrt(double x) +{ + if (x <= 0) { + return 0; + } + + // if we have both log and exp then use them +#if defined(HAVE_LOG) && defined(HAVE_EXP) + double result = exp(log(x) * 0.5); + std::cout << "Computing sqrt of " << x << " to be " << result << " using log" + << std::endl; +#else + // use the table to help find an initial value + double result = x; + if (x >= 1 && x < 10) { + result = sqrtTable[static_cast<int>(x)]; + } + + // if we have both log and exp then use them + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result * result); + result = result + 0.5 * delta / result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } +#endif + return result; +} +} +} diff --git a/Help/guide/tutorial/MultiPackage/MathFunctions/mysqrt.h b/Help/guide/tutorial/MultiPackage/MathFunctions/mysqrt.h new file mode 100644 index 0000000..e1c42ef --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/MathFunctions/mysqrt.h @@ -0,0 +1,6 @@ + +namespace mathfunctions { +namespace detail { +double mysqrt(double x); +} +} diff --git a/Help/guide/tutorial/MultiPackage/MultiCPackConfig.cmake b/Help/guide/tutorial/MultiPackage/MultiCPackConfig.cmake new file mode 100644 index 0000000..403b633 --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/MultiCPackConfig.cmake @@ -0,0 +1,7 @@ + +include("release/CPackConfig.cmake") + +set(CPACK_INSTALL_CMAKE_PROJECTS + "debug;Tutorial;ALL;/" + "release;Tutorial;ALL;/" + ) diff --git a/Help/guide/tutorial/MultiPackage/TutorialConfig.h.in b/Help/guide/tutorial/MultiPackage/TutorialConfig.h.in new file mode 100644 index 0000000..8cd2fc9 --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/TutorialConfig.h.in @@ -0,0 +1,3 @@ +// the configured version number +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ diff --git a/Help/guide/tutorial/MultiPackage/directions.txt b/Help/guide/tutorial/MultiPackage/directions.txt new file mode 100644 index 0000000..c3102bb --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/directions.txt @@ -0,0 +1,34 @@ +# Packaging Debug and Release # + +By default CMake is model is that a build directory only contains a single +configuration, be it Debug, Release, MinSizeRel, or RelWithDebInfo. + +But it is possible to setup CPack to bundle multiple build directories at the same +time to build a package that contains multiple configurations of the same project. + +First we need to ahead and construct a directory called 'multi_config' this +will contain all the builds that we want to package together. + +Second create a 'debug' and 'release' directory underneath 'multi_config'. At +the end you should have a layout that looks like: + +─ multi_config + ├── debug + └── release + +Now we need to setup debug and release builds, which would roughly entail +the following: + + cd debug + cmake -DCMAKE_BUILD_TYPE=Debug ../../MultiPackage/ + cmake --build . + cd ../release + cmake -DCMAKE_BUILD_TYPE=Release ../../MultiPackage/ + cmake --build . + cd .. + + +Now that both the debug and release builds are complete we can now use +the custom MultiCPackConfig to package both builds into a single release. + + cpack --config ../../MultiPackage/MultiCPackConfig.cmake diff --git a/Help/guide/tutorial/MultiPackage/tutorial.cxx b/Help/guide/tutorial/MultiPackage/tutorial.cxx new file mode 100644 index 0000000..4451cbd --- /dev/null +++ b/Help/guide/tutorial/MultiPackage/tutorial.cxx @@ -0,0 +1,25 @@ +// A simple program that computes the square root of a number +#include <iostream> +#include <sstream> +#include <string> + +#include "MathFunctions.h" +#include "TutorialConfig.h" + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "." + << Tutorial_VERSION_MINOR << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = std::stod(argv[1]); + + const double outputValue = mathfunctions::sqrt(inputValue); + + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} diff --git a/Help/guide/tutorial/Readme.txt b/Help/guide/tutorial/Readme.txt new file mode 100644 index 0000000..74eb01a --- /dev/null +++ b/Help/guide/tutorial/Readme.txt @@ -0,0 +1,16 @@ + +Step 0: A Starting Point +Step 1: Configure a File and C++11 Controls +Step 2: Adding a Library +Step 3: Usage Requirements for Library +Step 4: Installing and Testing +Step 5: System Introspection +Step 6: Custom Command and Generated File +Step 7: Building an Installer +Step 8: CDash submission +Step 9: Mixing Static and Shared +Step 10: Generator Expressions +Step 11: Adding Export Configuration +Complete: End result of Step 11 +Consumer: Example of Import Packages +MultiPackage: How to package Debug and Release versions diff --git a/Help/guide/tutorial/Step1/CMakeLists.txt b/Help/guide/tutorial/Step1/CMakeLists.txt new file mode 100644 index 0000000..141f0c2 --- /dev/null +++ b/Help/guide/tutorial/Step1/CMakeLists.txt @@ -0,0 +1,3 @@ +project(Tutorial) + +add_executable(Tutorial tutorial.cxx) diff --git a/Help/guide/tutorial/Step1/TutorialConfig.h.in b/Help/guide/tutorial/Step1/TutorialConfig.h.in new file mode 100644 index 0000000..7e4d7fa --- /dev/null +++ b/Help/guide/tutorial/Step1/TutorialConfig.h.in @@ -0,0 +1,3 @@ +// the configured options and settings for Tutorial +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ diff --git a/Help/guide/tutorial/Step1/directions.txt b/Help/guide/tutorial/Step1/directions.txt new file mode 100644 index 0000000..827d775 --- /dev/null +++ b/Help/guide/tutorial/Step1/directions.txt @@ -0,0 +1,95 @@ +# Adding a Version Number and Configured Header File # + +The first feature we will add is to provide our executable and project with a +version number. While we could do this exclusively in the source code, using +CMakeLists provides more flexibility. + +To add a version number we modify the CMakeLists file as follows: + + cmake_minimum_required(VERSION 3.3) + project(Tutorial) + + # the version number. + set(Tutorial_VERSION_MAJOR 1) + set(Tutorial_VERSION_MINOR 0) + + # configure a header file to pass some of the CMake settings + # to the source code + configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + + # add the executable + add_executable(Tutorial tutorial.cxx) + + # add the binary tree to the search path for include files + # so that we will find TutorialConfig.h + target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ) + + +We then create a TutorialConfig.h.in file in the source tree with the +following contents: + + // the configured options and settings for Tutorial + #define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ + #define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ + +When CMake configures this header file the values for @Tutorial_VERSION_MAJOR@ +and @Tutorial_VERSION_MINOR@ will be replaced by the values from the CMakeLists +file. Next we modify tutorial.cxx to include the configured header file and to +make use of the version numbers. The resulting source code is listed below. + + // A simple program that computes the square root of a number + #include <cmath> + #include <iostream> + #include <string> + #include <sstream> + + #include "TutorialConfig.h" + + int main (int argc, char *argv[]) + { + if (argc < 2) { + std::cout << argv[0] << " Version " + << Tutorial_VERSION_MAJOR << "." << Tutorial_VERSION_MINOR + << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = atof(argv[1]); + + double outputValue = sqrt(inputValue); + std::cout << "The square root of " + << inputValue << " is " << outputValue << std::endl; + return 0; + } + +# Adding C++11 support # + +Let's add some C++11 features to our project. We will need to explicitly state +in the CMake code that it should use the correct flags. The easiest way to +enable C++11 support for CMake is by using the CMAKE_CXX_STANDARD +and CMAKE_CXX_STANDARD_REQUIRED variables. + +First, replace `atof` with `std::stod` in tutorial.cxx. + +Then, add the CMAKE_CXX_STANDARD and CMAKE_CXX_STANDARD_REQUIRED variables to +the CMakeLists file. The STANADARD value should be set to 11, and REQUIRED +should be set to True. + + +# Build and Test # + +Run cmake or cmake-gui to configure the project and then build it with your +chosen build tool + +cd to the directory where Tutorial was built (likely the make directory or +a Debug or Release build configuration subdirectory) and run these commands: + + Tutorial 4294967296 + Tutorial 10 + Tutorial diff --git a/Help/guide/tutorial/Step1/tutorial.cxx b/Help/guide/tutorial/Step1/tutorial.cxx new file mode 100644 index 0000000..f8dd0c6 --- /dev/null +++ b/Help/guide/tutorial/Step1/tutorial.cxx @@ -0,0 +1,20 @@ +// A simple program that computes the square root of a number +#include <cmath> +#include <cstdlib> +#include <iostream> +#include <string> + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = atof(argv[1]); + + double outputValue = sqrt(inputValue); + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} diff --git a/Help/guide/tutorial/Step10/CMakeLists.txt b/Help/guide/tutorial/Step10/CMakeLists.txt new file mode 100644 index 0000000..79aadd5 --- /dev/null +++ b/Help/guide/tutorial/Step10/CMakeLists.txt @@ -0,0 +1,76 @@ +cmake_minimum_required(VERSION 3.3) +project(Tutorial) + +# control where the static and shared libraries are built so that on windows +# we don't need to tinker with the path to run the executable +set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") +set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") +set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") + +set(CMAKE_CXX_STANDARD 14) + +option(BUILD_SHARED_LIBS "Build using shared libraries" ON) + +# the version number. +set(Tutorial_VERSION_MAJOR 1) +set(Tutorial_VERSION_MINOR 0) + +# configure a header file to pass the version number only +configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + +# add the MathFunctions library +add_subdirectory(MathFunctions) + +# add the executable +add_executable(Tutorial tutorial.cxx) +target_link_libraries(Tutorial MathFunctions) + +# add the binary tree to the search path for include files +# so that we will find TutorialConfig.h +target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ) + +# add the install targets +install(TARGETS Tutorial DESTINATION bin) +install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h" + DESTINATION include + ) + +# enable testing +enable_testing() + +# does the application run +add_test(NAME Runs COMMAND Tutorial 25) + +# does the usage message work? +add_test(NAME Usage COMMAND Tutorial) +set_tests_properties(Usage + PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number" + ) + +# define a function to simplify adding tests +function(do_test target arg result) + add_test(NAME Comp${arg} COMMAND ${target} ${arg}) + set_tests_properties(Comp${arg} + PROPERTIES PASS_REGULAR_EXPRESSION ${result} + ) +endfunction(do_test) + +# do a bunch of result based tests +do_test(Tutorial 4 "4 is 2") +do_test(Tutorial 9 "9 is 3") +do_test(Tutorial 5 "5 is 2.236") +do_test(Tutorial 7 "7 is 2.645") +do_test(Tutorial 25 "25 is 5") +do_test(Tutorial -25 "-25 is [-nan|nan|0]") +do_test(Tutorial 0.0001 "0.0001 is 0.01") + +include(InstallRequiredSystemLibraries) +set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/License.txt") +set(CPACK_PACKAGE_VERSION_MAJOR "${Tutorial_VERSION_MAJOR}") +set(CPACK_PACKAGE_VERSION_MINOR "${Tutorial_VERSION_MINOR}") +include(CPack) diff --git a/Help/guide/tutorial/Step10/License.txt b/Help/guide/tutorial/Step10/License.txt new file mode 100644 index 0000000..c62d00b --- /dev/null +++ b/Help/guide/tutorial/Step10/License.txt @@ -0,0 +1,2 @@ +This is the open source License.txt file introduced in +CMake/Tutorial/Step7... diff --git a/Help/guide/tutorial/Step10/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step10/MathFunctions/CMakeLists.txt new file mode 100644 index 0000000..7a23505 --- /dev/null +++ b/Help/guide/tutorial/Step10/MathFunctions/CMakeLists.txt @@ -0,0 +1,61 @@ + +# add the library that runs +add_library(MathFunctions MathFunctions.cxx) + +# state that anybody linking to us needs to include the current source dir +# to find MathFunctions.h, while we don't. +target_include_directories(MathFunctions + INTERFACE ${CMAKE_CURRENT_SOURCE_DIR} + ) + +# should we use our own math functions +option(USE_MYMATH "Use tutorial provided math implementation" ON) +if(USE_MYMATH) + + # does this system provide the log and exp functions? + include(CheckSymbolExists) + set(CMAKE_REQUIRED_LIBRARIES "m") + check_symbol_exists(log "math.h" HAVE_LOG) + check_symbol_exists(exp "math.h" HAVE_EXP) + + # first we add the executable that generates the table + add_executable(MakeTable MakeTable.cxx) + + # add the command to generate the source code + add_custom_command( + OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h + COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h + DEPENDS MakeTable + ) + + # library that just does sqrt + add_library(SqrtLibrary STATIC + mysqrt.cxx + ${CMAKE_CURRENT_BINARY_DIR}/Table.h + ) + + # state that we depend on our binary dir to find Table.h + target_include_directories(SqrtLibrary PRIVATE + ${CMAKE_CURRENT_BINARY_DIR} + ) + + # state that SqrtLibrary need PIC when the default is shared libraries + set_target_properties(SqrtLibrary PROPERTIES + POSITION_INDEPENDENT_CODE ${BUILD_SHARED_LIBS} + ) + + target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH") + if(HAVE_LOG AND HAVE_EXP) + target_compile_definitions(SqrtLibrary + PRIVATE "HAVE_LOG" "HAVE_EXP") + endif() + + target_link_libraries(MathFunctions PRIVATE SqrtLibrary) +endif() + +# define the symbol stating we are using the declspec(dllexport) when +# building on windows +target_compile_definitions(MathFunctions PRIVATE "EXPORTING_MYMATH") + +install(TARGETS MathFunctions DESTINATION lib) +install(FILES MathFunctions.h DESTINATION include) diff --git a/Help/guide/tutorial/Step10/MathFunctions/MakeTable.cxx b/Help/guide/tutorial/Step10/MathFunctions/MakeTable.cxx new file mode 100644 index 0000000..ee58556 --- /dev/null +++ b/Help/guide/tutorial/Step10/MathFunctions/MakeTable.cxx @@ -0,0 +1,25 @@ +// A simple program that builds a sqrt table +#include <cmath> +#include <fstream> +#include <iostream> + +int main(int argc, char* argv[]) +{ + // make sure we have enough arguments + if (argc < 2) { + return 1; + } + + std::ofstream fout(argv[1], std::ios_base::out); + const bool fileOpen = fout.is_open(); + if (fileOpen) { + fout << "double sqrtTable[] = {" << std::endl; + for (int i = 0; i < 10; ++i) { + fout << sqrt(static_cast<double>(i)) << "," << std::endl; + } + // close the table with a zero + fout << "0};" << std::endl; + fout.close(); + } + return fileOpen ? 0 : 1; // return 0 if wrote the file +} diff --git a/Help/guide/tutorial/Step10/MathFunctions/MathFunctions.cxx b/Help/guide/tutorial/Step10/MathFunctions/MathFunctions.cxx new file mode 100644 index 0000000..5351184 --- /dev/null +++ b/Help/guide/tutorial/Step10/MathFunctions/MathFunctions.cxx @@ -0,0 +1,18 @@ + +#include "MathFunctions.h" +#include <cmath> + +#ifdef USE_MYMATH +# include "mysqrt.h" +#endif + +namespace mathfunctions { +double sqrt(double x) +{ +#ifdef USE_MYMATH + return detail::mysqrt(x); +#else + return std::sqrt(x); +#endif +} +} diff --git a/Help/guide/tutorial/Step10/MathFunctions/MathFunctions.h b/Help/guide/tutorial/Step10/MathFunctions/MathFunctions.h new file mode 100644 index 0000000..3fb547b --- /dev/null +++ b/Help/guide/tutorial/Step10/MathFunctions/MathFunctions.h @@ -0,0 +1,14 @@ + +#if defined(_WIN32) +# if defined(EXPORTING_MYMATH) +# define DECLSPEC __declspec(dllexport) +# else +# define DECLSPEC __declspec(dllimport) +# endif +#else // non windows +# define DECLSPEC +#endif + +namespace mathfunctions { +double DECLSPEC sqrt(double x); +} diff --git a/Help/guide/tutorial/Step10/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step10/MathFunctions/mysqrt.cxx new file mode 100644 index 0000000..96d9421 --- /dev/null +++ b/Help/guide/tutorial/Step10/MathFunctions/mysqrt.cxx @@ -0,0 +1,45 @@ +#include "MathFunctions.h" +#include <iostream> + +// include the generated table +#include "Table.h" + +#include <cmath> + +namespace mathfunctions { +namespace detail { +// a hack square root calculation using simple operations +double mysqrt(double x) +{ + if (x <= 0) { + return 0; + } + + // if we have both log and exp then use them +#if defined(HAVE_LOG) && defined(HAVE_EXP) + double result = exp(log(x) * 0.5); + std::cout << "Computing sqrt of " << x << " to be " << result << " using log" + << std::endl; +#else + // use the table to help find an initial value + double result = x; + if (x >= 1 && x < 10) { + result = sqrtTable[static_cast<int>(x)]; + } + + // if we have both log and exp then use them + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result * result); + result = result + 0.5 * delta / result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } +#endif + return result; +} +} +} diff --git a/Help/guide/tutorial/Step10/MathFunctions/mysqrt.h b/Help/guide/tutorial/Step10/MathFunctions/mysqrt.h new file mode 100644 index 0000000..e1c42ef --- /dev/null +++ b/Help/guide/tutorial/Step10/MathFunctions/mysqrt.h @@ -0,0 +1,6 @@ + +namespace mathfunctions { +namespace detail { +double mysqrt(double x); +} +} diff --git a/Help/guide/tutorial/Step10/TutorialConfig.h.in b/Help/guide/tutorial/Step10/TutorialConfig.h.in new file mode 100644 index 0000000..8cd2fc9 --- /dev/null +++ b/Help/guide/tutorial/Step10/TutorialConfig.h.in @@ -0,0 +1,3 @@ +// the configured version number +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ diff --git a/Help/guide/tutorial/Step10/directions.txt b/Help/guide/tutorial/Step10/directions.txt new file mode 100644 index 0000000..5317b54 --- /dev/null +++ b/Help/guide/tutorial/Step10/directions.txt @@ -0,0 +1,38 @@ +# Adding Generator Expressions # + +Generator expressions are evaluated during build system generation to produce +information specific to each build configuration. + +Generator expressions are allowed in the context of many target properties, such +as LINK_LIBRARIES, INCLUDE_DIRECTORIES, COMPILE_DEFINITIONS and others. They may +also be used when using commands to populate those properties, such as +target_link_libraries(), target_include_directories(), +target_compile_definitions() and others. + +Generator expressions may to used to enable conditional linking, conditional +definitions used when compiling, and conditional include directories and more. +The conditions may be based on the build configuration, target properties, +platform information or any other queryable information. + +There are different types of generator expressions including Logical, +Informational, and Output expressions. + +Logical expressions are used to create conditional output. The basic expressions +are the 0 and 1 expressions. A "$<0:...>" results in the empty string, and +"$<1:...>" results in the content of "...". They can also be nested. +For example: + + if(HAVE_LOG AND HAVE_EXP) + target_compile_definitions(SqrtLibrary + PRIVATE "HAVE_LOG" "HAVE_EXP") + endif() + +Can be rewritten with generator expressions: + + target_compile_definitions(SqrtLibrary PRIVATE + "$<$<BOOL:${HAVE_LOG}>:HAVE_LOG>" + "$<$<BOOL:${HAVE_EXP}>:HAVE_EXP>" + ) + +Note that "${HAVE_LOG}" is evaluated at CMake configure time while +"$<$<BOOL:${HAVE_LOG}>:HAVE_LOG>" is evaluated at build system generation time. diff --git a/Help/guide/tutorial/Step10/tutorial.cxx b/Help/guide/tutorial/Step10/tutorial.cxx new file mode 100644 index 0000000..4451cbd --- /dev/null +++ b/Help/guide/tutorial/Step10/tutorial.cxx @@ -0,0 +1,25 @@ +// A simple program that computes the square root of a number +#include <iostream> +#include <sstream> +#include <string> + +#include "MathFunctions.h" +#include "TutorialConfig.h" + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "." + << Tutorial_VERSION_MINOR << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = std::stod(argv[1]); + + const double outputValue = mathfunctions::sqrt(inputValue); + + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} diff --git a/Help/guide/tutorial/Step11/CMakeLists.txt b/Help/guide/tutorial/Step11/CMakeLists.txt new file mode 100644 index 0000000..79aadd5 --- /dev/null +++ b/Help/guide/tutorial/Step11/CMakeLists.txt @@ -0,0 +1,76 @@ +cmake_minimum_required(VERSION 3.3) +project(Tutorial) + +# control where the static and shared libraries are built so that on windows +# we don't need to tinker with the path to run the executable +set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") +set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") +set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") + +set(CMAKE_CXX_STANDARD 14) + +option(BUILD_SHARED_LIBS "Build using shared libraries" ON) + +# the version number. +set(Tutorial_VERSION_MAJOR 1) +set(Tutorial_VERSION_MINOR 0) + +# configure a header file to pass the version number only +configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + +# add the MathFunctions library +add_subdirectory(MathFunctions) + +# add the executable +add_executable(Tutorial tutorial.cxx) +target_link_libraries(Tutorial MathFunctions) + +# add the binary tree to the search path for include files +# so that we will find TutorialConfig.h +target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ) + +# add the install targets +install(TARGETS Tutorial DESTINATION bin) +install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h" + DESTINATION include + ) + +# enable testing +enable_testing() + +# does the application run +add_test(NAME Runs COMMAND Tutorial 25) + +# does the usage message work? +add_test(NAME Usage COMMAND Tutorial) +set_tests_properties(Usage + PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number" + ) + +# define a function to simplify adding tests +function(do_test target arg result) + add_test(NAME Comp${arg} COMMAND ${target} ${arg}) + set_tests_properties(Comp${arg} + PROPERTIES PASS_REGULAR_EXPRESSION ${result} + ) +endfunction(do_test) + +# do a bunch of result based tests +do_test(Tutorial 4 "4 is 2") +do_test(Tutorial 9 "9 is 3") +do_test(Tutorial 5 "5 is 2.236") +do_test(Tutorial 7 "7 is 2.645") +do_test(Tutorial 25 "25 is 5") +do_test(Tutorial -25 "-25 is [-nan|nan|0]") +do_test(Tutorial 0.0001 "0.0001 is 0.01") + +include(InstallRequiredSystemLibraries) +set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/License.txt") +set(CPACK_PACKAGE_VERSION_MAJOR "${Tutorial_VERSION_MAJOR}") +set(CPACK_PACKAGE_VERSION_MINOR "${Tutorial_VERSION_MINOR}") +include(CPack) diff --git a/Help/guide/tutorial/Step11/License.txt b/Help/guide/tutorial/Step11/License.txt new file mode 100644 index 0000000..c62d00b --- /dev/null +++ b/Help/guide/tutorial/Step11/License.txt @@ -0,0 +1,2 @@ +This is the open source License.txt file introduced in +CMake/Tutorial/Step7... diff --git a/Help/guide/tutorial/Step11/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step11/MathFunctions/CMakeLists.txt new file mode 100644 index 0000000..760d6a5 --- /dev/null +++ b/Help/guide/tutorial/Step11/MathFunctions/CMakeLists.txt @@ -0,0 +1,60 @@ + +# add the library that runs +add_library(MathFunctions MathFunctions.cxx) + +# state that anybody linking to us needs to include the current source dir +# to find MathFunctions.h, while we don't. +target_include_directories(MathFunctions + INTERFACE ${CMAKE_CURRENT_SOURCE_DIR} + ) + +# should we use our own math functions +option(USE_MYMATH "Use tutorial provided math implementation" ON) +if(USE_MYMATH) + + # does this system provide the log and exp functions? + include(CheckSymbolExists) + set(CMAKE_REQUIRED_LIBRARIES "m") + check_symbol_exists(log "math.h" HAVE_LOG) + check_symbol_exists(exp "math.h" HAVE_EXP) + + # first we add the executable that generates the table + add_executable(MakeTable MakeTable.cxx) + + # add the command to generate the source code + add_custom_command( + OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h + COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h + DEPENDS MakeTable + ) + + # library that just does sqrt + add_library(SqrtLibrary STATIC + mysqrt.cxx + ${CMAKE_CURRENT_BINARY_DIR}/Table.h + ) + + # state that we depend on our binary dir to find Table.h + target_include_directories(SqrtLibrary PRIVATE + ${CMAKE_CURRENT_BINARY_DIR} + ) + + set_target_properties(SqrtLibrary PROPERTIES + POSITION_INDEPENDENT_CODE ${BUILD_SHARED_LIBS} + ) + + target_compile_definitions(SqrtLibrary PRIVATE + "$<$<BOOL:${HAVE_LOG}>:HAVE_LOG>" + "$<$<BOOL:${HAVE_EXP}>:HAVE_EXP>" + ) + target_link_libraries(MathFunctions PRIVATE SqrtLibrary) +endif() + +target_compile_definitions(MathFunctions PRIVATE "$<$<BOOL:${USE_MYMATH}>:USE_MYMATH>") + +# define the symbol stating we are using the declspec(dllexport) when +#building on windows +target_compile_definitions(MathFunctions PRIVATE "EXPORTING_MYMATH") + +install(TARGETS MathFunctions DESTINATION lib) +install(FILES MathFunctions.h DESTINATION include) diff --git a/Help/guide/tutorial/Step11/MathFunctions/MakeTable.cxx b/Help/guide/tutorial/Step11/MathFunctions/MakeTable.cxx new file mode 100644 index 0000000..ee58556 --- /dev/null +++ b/Help/guide/tutorial/Step11/MathFunctions/MakeTable.cxx @@ -0,0 +1,25 @@ +// A simple program that builds a sqrt table +#include <cmath> +#include <fstream> +#include <iostream> + +int main(int argc, char* argv[]) +{ + // make sure we have enough arguments + if (argc < 2) { + return 1; + } + + std::ofstream fout(argv[1], std::ios_base::out); + const bool fileOpen = fout.is_open(); + if (fileOpen) { + fout << "double sqrtTable[] = {" << std::endl; + for (int i = 0; i < 10; ++i) { + fout << sqrt(static_cast<double>(i)) << "," << std::endl; + } + // close the table with a zero + fout << "0};" << std::endl; + fout.close(); + } + return fileOpen ? 0 : 1; // return 0 if wrote the file +} diff --git a/Help/guide/tutorial/Step11/MathFunctions/MathFunctions.cxx b/Help/guide/tutorial/Step11/MathFunctions/MathFunctions.cxx new file mode 100644 index 0000000..5351184 --- /dev/null +++ b/Help/guide/tutorial/Step11/MathFunctions/MathFunctions.cxx @@ -0,0 +1,18 @@ + +#include "MathFunctions.h" +#include <cmath> + +#ifdef USE_MYMATH +# include "mysqrt.h" +#endif + +namespace mathfunctions { +double sqrt(double x) +{ +#ifdef USE_MYMATH + return detail::mysqrt(x); +#else + return std::sqrt(x); +#endif +} +} diff --git a/Help/guide/tutorial/Step11/MathFunctions/MathFunctions.h b/Help/guide/tutorial/Step11/MathFunctions/MathFunctions.h new file mode 100644 index 0000000..3fb547b --- /dev/null +++ b/Help/guide/tutorial/Step11/MathFunctions/MathFunctions.h @@ -0,0 +1,14 @@ + +#if defined(_WIN32) +# if defined(EXPORTING_MYMATH) +# define DECLSPEC __declspec(dllexport) +# else +# define DECLSPEC __declspec(dllimport) +# endif +#else // non windows +# define DECLSPEC +#endif + +namespace mathfunctions { +double DECLSPEC sqrt(double x); +} diff --git a/Help/guide/tutorial/Step11/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step11/MathFunctions/mysqrt.cxx new file mode 100644 index 0000000..96d9421 --- /dev/null +++ b/Help/guide/tutorial/Step11/MathFunctions/mysqrt.cxx @@ -0,0 +1,45 @@ +#include "MathFunctions.h" +#include <iostream> + +// include the generated table +#include "Table.h" + +#include <cmath> + +namespace mathfunctions { +namespace detail { +// a hack square root calculation using simple operations +double mysqrt(double x) +{ + if (x <= 0) { + return 0; + } + + // if we have both log and exp then use them +#if defined(HAVE_LOG) && defined(HAVE_EXP) + double result = exp(log(x) * 0.5); + std::cout << "Computing sqrt of " << x << " to be " << result << " using log" + << std::endl; +#else + // use the table to help find an initial value + double result = x; + if (x >= 1 && x < 10) { + result = sqrtTable[static_cast<int>(x)]; + } + + // if we have both log and exp then use them + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result * result); + result = result + 0.5 * delta / result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } +#endif + return result; +} +} +} diff --git a/Help/guide/tutorial/Step11/MathFunctions/mysqrt.h b/Help/guide/tutorial/Step11/MathFunctions/mysqrt.h new file mode 100644 index 0000000..e1c42ef --- /dev/null +++ b/Help/guide/tutorial/Step11/MathFunctions/mysqrt.h @@ -0,0 +1,6 @@ + +namespace mathfunctions { +namespace detail { +double mysqrt(double x); +} +} diff --git a/Help/guide/tutorial/Step11/TutorialConfig.h.in b/Help/guide/tutorial/Step11/TutorialConfig.h.in new file mode 100644 index 0000000..8cd2fc9 --- /dev/null +++ b/Help/guide/tutorial/Step11/TutorialConfig.h.in @@ -0,0 +1,3 @@ +// the configured version number +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ diff --git a/Help/guide/tutorial/Step11/directions.txt b/Help/guide/tutorial/Step11/directions.txt new file mode 100644 index 0000000..ebb5def --- /dev/null +++ b/Help/guide/tutorial/Step11/directions.txt @@ -0,0 +1,104 @@ +# Adding Export Configuration # + +During Step 4 of the tutorial we added the ability for CMake to install the +library and headers of the project. During Step 7 we added the ability +to package up this information so it could be distributed to other people. + +The next step is to add the necessary information so that other CMake projects +can use our project, be it from a build directory, a local install or when +packaged. + +The first step is to update our install(TARGETS) commands to not only specify +a DESTINATION but also an EXPORT. The EXPORT keyword generates and installs a +CMake file containing code to import all targets listed in the install command +from the installation tree. So let's go ahead and explicitly EXPORT the +MathFunctions library by updating the install command in +MathFunctions/CMakeLists.txt to look like: + + install(TARGETS MathFunctions DESTINATION lib EXPORT MathFunctionsTargets) + +Now that we have MathFunctions being exported, we also need to explicitly install +the generated MathFunctionsTargets.cmake file. This is done by adding +the following to the bottom of the top-level CMakeLists.txt: + + # install the configuration targets + install(EXPORT MathFunctionsTargets + FILE MathFunctionsTargets.cmake + DESTINATION lib/cmake/MathFunctions + ) + +At this point you should try and run CMake. If everything is setup properly +you will see that CMake will generate an error that looks like: + + Target "MathFunctions" INTERFACE_INCLUDE_DIRECTORIES property contains + path: + + "/Users/robert/Documents/CMakeClass/Tutorial/Step11/MathFunctions" + + which is prefixed in the source directory. + +What CMake is trying to say is that during generating the export information +it will export a path that is intrinsically tied to the current machine and +will not be valid on other machines. The solution to this is to update the +MathFunctions target_include_directories to understand that it needs different +INTERFACE locations when being used from within the build directory and from an +install / package. This means converting the target_include_directories +call for MathFunctions to look like: + + target_include_directories(MathFunctions + INTERFACE + $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}> + $<INSTALL_INTERFACE:include> + ) + +Once this has been updated, we can re-run CMake and see verify that it doesn't +warn anymore. + +At this point, we have CMake properly packaging the target information that is +required but we will still need to generate a MathFunctionsConfig.cmake, so +that the CMake find_package command can find our project. So let's go ahead and +add a new file to the top-level of the project called Config.cmake.in with the +following contents: + + @PACKAGE_INIT@ + + include ( "${CMAKE_CURRENT_LIST_DIR}/MathFunctionsTargets.cmake" ) + +Then, to properly configure and install that file, add the following to the +bottom of the top-level CMakeLists: + + include(CMakePackageConfigHelpers) + # generate the config file that is includes the exports + configure_package_config_file(${CMAKE_CURRENT_SOURCE_DIR}/Config.cmake.in + "${CMAKE_CURRENT_BINARY_DIR}/MathFunctionsConfig.cmake" + INSTALL_DESTINATION "lib/cmake/example" + NO_SET_AND_CHECK_MACRO + NO_CHECK_REQUIRED_COMPONENTS_MACRO + ) + # generate the version file for the config file + write_basic_package_version_file( + "${CMAKE_CURRENT_BINARY_DIR}/MathFunctionsConfigVersion.cmake" + VERSION "${Tutorial_VERSION_MAJOR}.${Tutorial_VERSION_MINOR}" + COMPATIBILITY AnyNewerVersion + ) + + # install the configuration file + install(FILES + ${CMAKE_CURRENT_BINARY_DIR}/MathFunctionsConfig.cmake + DESTINATION lib/cmake/MathFunctions + ) + +At this point, we have generated a relocatable CMake Configuration for our project +that can be used after the project has been installed or packaged. If we want +our project to also be used from a build directory we only have to add +the following to the bottom of the top level CMakeLists: + + # generate the export targets for the build tree + # needs to be after the install(TARGETS ) command + export(EXPORT MathFunctionsTargets + FILE "${CMAKE_CURRENT_BINARY_DIR}/MathFunctionsTargets.cmake" + ) + +With this export call we now generate a Targets.cmake, allowing the configured +MathFunctionsConfig.cmake in the build directory to be used by other projects, +without needing it to be installed. diff --git a/Help/guide/tutorial/Step11/tutorial.cxx b/Help/guide/tutorial/Step11/tutorial.cxx new file mode 100644 index 0000000..38d4a79 --- /dev/null +++ b/Help/guide/tutorial/Step11/tutorial.cxx @@ -0,0 +1,25 @@ +// A simple program that computes the square root of a number +#include <cmath> +#include <iostream> +#include <string> + +#include "MathFunctions.h" +#include "TutorialConfig.h" + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "." + << Tutorial_VERSION_MINOR << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = std::stod(argv[1]); + + const double outputValue = mathfunctions::sqrt(inputValue); + + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} diff --git a/Help/guide/tutorial/Step2/CMakeLists.txt b/Help/guide/tutorial/Step2/CMakeLists.txt new file mode 100644 index 0000000..8e50e7c --- /dev/null +++ b/Help/guide/tutorial/Step2/CMakeLists.txt @@ -0,0 +1,23 @@ +cmake_minimum_required(VERSION 3.3) +project(Tutorial) + +set(CMAKE_CXX_STANDARD 14) +# the version number. +set(Tutorial_VERSION_MAJOR 1) +set(Tutorial_VERSION_MINOR 0) + +# configure a header file to pass some of the CMake settings +# to the source code +configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + +# add the executable +add_executable(Tutorial tutorial.cxx) + +# add the binary tree to the search path for include files +# so that we will find TutorialConfig.h +target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ) diff --git a/Help/guide/tutorial/Step2/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step2/MathFunctions/CMakeLists.txt new file mode 100644 index 0000000..8b443a6 --- /dev/null +++ b/Help/guide/tutorial/Step2/MathFunctions/CMakeLists.txt @@ -0,0 +1 @@ +add_library(MathFunctions mysqrt.cxx) diff --git a/Help/guide/tutorial/Step2/MathFunctions/MathFunctions.h b/Help/guide/tutorial/Step2/MathFunctions/MathFunctions.h new file mode 100644 index 0000000..cd36bcc --- /dev/null +++ b/Help/guide/tutorial/Step2/MathFunctions/MathFunctions.h @@ -0,0 +1 @@ +double mysqrt(double x); diff --git a/Help/guide/tutorial/Step2/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step2/MathFunctions/mysqrt.cxx new file mode 100644 index 0000000..7d9379e --- /dev/null +++ b/Help/guide/tutorial/Step2/MathFunctions/mysqrt.cxx @@ -0,0 +1,23 @@ +#include "MathFunctions.h" +#include <iostream> + +// a hack square root calculation using simple operations +double mysqrt(double x) +{ + if (x <= 0) { + return 0; + } + + double result = x; + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result * result); + result = result + 0.5 * delta / result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } + return result; +} diff --git a/Help/guide/tutorial/Step2/TutorialConfig.h.in b/Help/guide/tutorial/Step2/TutorialConfig.h.in new file mode 100644 index 0000000..7e4d7fa --- /dev/null +++ b/Help/guide/tutorial/Step2/TutorialConfig.h.in @@ -0,0 +1,3 @@ +// the configured options and settings for Tutorial +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ diff --git a/Help/guide/tutorial/Step2/directions.txt b/Help/guide/tutorial/Step2/directions.txt new file mode 100644 index 0000000..48de7a2 --- /dev/null +++ b/Help/guide/tutorial/Step2/directions.txt @@ -0,0 +1,101 @@ +# Adding a Library # + +Now we will add a library to our project. This library will contain our own +implementation for computing the square root of a number. The executable can +then use this library instead of the standard square root function provided by +the compiler. + +For this tutorial we will put the library into a subdirectory +called MathFunctions. It will have the following one line CMakeLists file: + + add_library(MathFunctions mysqrt.cxx) + +The source file mysqrt.cxx has one function called mysqrt that provides similar +functionality to the compiler’s sqrt function. To make use of the new library +we add an add_subdirectory call in the top-level CMakeLists file so that the +library will get built. We add the new library to the executable, and add the +MathFunctions as an include directory so that mqsqrt.h header file can be +found. The last few lines of the top-level CMakeLists file now look like: + + + add_subdirectory(MathFunctions) + + #add the executable + add_executable(Tutorial tutorial.cxx) + + target_link_libraries(Tutorial ${EXTRA_LIBS}) + + +Now let us make the MathFunctions library optional. While for the tutorial +there really isn’t any need to do so, but with larger projects this is a common +occurrence. The first step is to add an option to the top-level CMakeLists file. + + option (USE_MYMATH + "Use tutorial provided math implementation" ON) + +This will show up in CMake GUI and ccmake with a default value of ON that can +be changed by the user. This setting will be stored so that the user does not +need to set the value each time they run CMake on this build directory. + +The next change is to make building and linking the MathFunctions library +conditional. To do this we change the top-level CMakeLists file to look like +the following: + + cmake_minimum_required(VERSION 3.3) + project(Tutorial) + + set(CMAKE_CXX_STANDARD 14) + + # the version number. + set(Tutorial_VERSION_MAJOR 1) + set(Tutorial_VERSION_MINOR 0) + + # configure a header file to pass some of the CMake settings + # to the source code + configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + + # should we use our own math functions + option(USE_MYMATH "Use tutorial provided math implementation" ON) + + # add the MathFunctions library? + if(USE_MYMATH) + add_subdirectory(MathFunctions) + list(APPEND EXTRA_LIBS MathFunctions) + list(APPEND EXTRA_INCLUDES "${PROJECT_SOURCE_DIR}/MathFunctions") + endif(USE_MYMATH) + + # add the executable + add_executable(Tutorial tutorial.cxx) + + target_link_libraries(Tutorial ${EXTRA_LIBS}) + + # add the binary tree to the search path for include files + # so that we will find TutorialConfig.h + target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ${EXTRA_INCLUDES} + ) + +Note the use of the variables EXTRA_LIBS, and EXTRA_INCLUDES to collect +up any optional libraries to later be linked into the executable. This is a +classic approach when dealing with many optional components, we will cover the +modern approach in the next step. For now the corresponding changes to the +source code are fairly straightforward and leave us with: + + #ifdef USE_MYMATH + double outputValue = mysqrt(inputValue); + #else + double outputValue = sqrt(inputValue); + #endif + +Since the source code now requires USE_MYMATH we can add it to the +TutorialConfig.h.in. Simply add the following line: + #cmakedefine USE_MYMATH + +Run cmake or cmake-gui to configure the project and then build it with your +chosen build tool and then run the built Tutorial executable. + +Which function gives better results, Step1’s sqrt or Step2’s mysqrt? diff --git a/Help/guide/tutorial/Step2/tutorial.cxx b/Help/guide/tutorial/Step2/tutorial.cxx new file mode 100644 index 0000000..5ba34e8 --- /dev/null +++ b/Help/guide/tutorial/Step2/tutorial.cxx @@ -0,0 +1,23 @@ +// A simple program that computes the square root of a number +#include <cmath> +#include <iostream> +#include <string> + +#include "TutorialConfig.h" + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "." + << Tutorial_VERSION_MINOR << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = std::stod(argv[1]); + + double outputValue = sqrt(inputValue); + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} diff --git a/Help/guide/tutorial/Step3/CMakeLists.txt b/Help/guide/tutorial/Step3/CMakeLists.txt new file mode 100644 index 0000000..baa0a44 --- /dev/null +++ b/Help/guide/tutorial/Step3/CMakeLists.txt @@ -0,0 +1,37 @@ +cmake_minimum_required(VERSION 3.3) +project(Tutorial) + +set(CMAKE_CXX_STANDARD 14) + +# should we use our own math functions +option(USE_MYMATH "Use tutorial provided math implementation" ON) + +# the version number. +set(Tutorial_VERSION_MAJOR 1) +set(Tutorial_VERSION_MINOR 0) + +# configure a header file to pass some of the CMake settings +# to the source code +configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + +# add the MathFunctions library? +if(USE_MYMATH) + add_subdirectory(MathFunctions) + list(APPEND EXTRA_LIBS MathFunctions) + list(APPEND EXTRA_INCLUDES "${PROJECT_SOURCE_DIR}/MathFunctions") +endif(USE_MYMATH) + +# add the executable +add_executable(Tutorial tutorial.cxx) + +target_link_libraries(Tutorial ${EXTRA_LIBS}) + +# add the binary tree to the search path for include files +# so that we will find TutorialConfig.h +target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ${EXTRA_INCLUDES} + ) diff --git a/Help/guide/tutorial/Step3/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step3/MathFunctions/CMakeLists.txt new file mode 100644 index 0000000..8b443a6 --- /dev/null +++ b/Help/guide/tutorial/Step3/MathFunctions/CMakeLists.txt @@ -0,0 +1 @@ +add_library(MathFunctions mysqrt.cxx) diff --git a/Help/guide/tutorial/Step3/MathFunctions/MathFunctions.h b/Help/guide/tutorial/Step3/MathFunctions/MathFunctions.h new file mode 100644 index 0000000..cd36bcc --- /dev/null +++ b/Help/guide/tutorial/Step3/MathFunctions/MathFunctions.h @@ -0,0 +1 @@ +double mysqrt(double x); diff --git a/Help/guide/tutorial/Step3/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step3/MathFunctions/mysqrt.cxx new file mode 100644 index 0000000..7d9379e --- /dev/null +++ b/Help/guide/tutorial/Step3/MathFunctions/mysqrt.cxx @@ -0,0 +1,23 @@ +#include "MathFunctions.h" +#include <iostream> + +// a hack square root calculation using simple operations +double mysqrt(double x) +{ + if (x <= 0) { + return 0; + } + + double result = x; + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result * result); + result = result + 0.5 * delta / result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } + return result; +} diff --git a/Help/guide/tutorial/Step3/TutorialConfig.h.in b/Help/guide/tutorial/Step3/TutorialConfig.h.in new file mode 100644 index 0000000..e23f521 --- /dev/null +++ b/Help/guide/tutorial/Step3/TutorialConfig.h.in @@ -0,0 +1,4 @@ +// the configured options and settings for Tutorial +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ +#cmakedefine USE_MYMATH diff --git a/Help/guide/tutorial/Step3/directions.txt b/Help/guide/tutorial/Step3/directions.txt new file mode 100644 index 0000000..54d0318 --- /dev/null +++ b/Help/guide/tutorial/Step3/directions.txt @@ -0,0 +1,26 @@ +# Adding Usage Requirements for Library # + +Usage requirements allow for far better control over a library / executable's +link and include line. While also giving more control over the transitive +property of targets inside CMake. The primary commands that leverage usage +requirements are: + + - target_compile_definitions + - target_compile_options + - target_include_directories + - target_link_libraries + +First up is MathFunctions. We first state that anybody linking to MathFunctions +needs to include the current source directory, while MathFunctions itself +doesn't. So this can become an INTERFACE usage requirement. + +Remember INTERFACE means things that consumers require but the producer doesn't. + + target_include_directories(MathFunctions + INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}) + +Now that we've specified usage requirements for MathFunctions we can safely remove +our uses of the EXTRA_INCLUDES variable. + +Run cmake or cmake-gui to configure the project and then build it with your +chosen build tool. diff --git a/Help/guide/tutorial/Step3/tutorial.cxx b/Help/guide/tutorial/Step3/tutorial.cxx new file mode 100644 index 0000000..c2b89df --- /dev/null +++ b/Help/guide/tutorial/Step3/tutorial.cxx @@ -0,0 +1,32 @@ +// A simple program that computes the square root of a number +#include <cmath> +#include <iostream> +#include <string> + +#include "TutorialConfig.h" + +#ifdef USE_MYMATH +# include "MathFunctions.h" +#endif + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "." + << Tutorial_VERSION_MINOR << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = std::stod(argv[1]); + +#ifdef USE_MYMATH + double outputValue = mysqrt(inputValue); +#else + double outputValue = sqrt(inputValue); +#endif + + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} diff --git a/Help/guide/tutorial/Step4/CMakeLists.txt b/Help/guide/tutorial/Step4/CMakeLists.txt new file mode 100644 index 0000000..9ce60b9 --- /dev/null +++ b/Help/guide/tutorial/Step4/CMakeLists.txt @@ -0,0 +1,35 @@ +cmake_minimum_required(VERSION 3.3) +project(Tutorial) + +set(CMAKE_CXX_STANDARD 14) + +# should we use our own math functions +option(USE_MYMATH "Use tutorial provided math implementation" ON) + +# the version number. +set(Tutorial_VERSION_MAJOR 1) +set(Tutorial_VERSION_MINOR 0) + +# configure a header file to pass some of the CMake settings +# to the source code +configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + +# add the MathFunctions library? +if(USE_MYMATH) + add_subdirectory(MathFunctions) + list(APPEND EXTRA_LIBS MathFunctions) +endif(USE_MYMATH) + +# add the executable +add_executable(Tutorial tutorial.cxx) + +target_link_libraries(Tutorial PUBLIC ${EXTRA_LIBS}) + +# add the binary tree to the search path for include files +# so that we will find TutorialConfig.h +target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ) diff --git a/Help/guide/tutorial/Step4/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step4/MathFunctions/CMakeLists.txt new file mode 100644 index 0000000..0515852 --- /dev/null +++ b/Help/guide/tutorial/Step4/MathFunctions/CMakeLists.txt @@ -0,0 +1,7 @@ +add_library(MathFunctions mysqrt.cxx) + +# state that anybody linking to us needs to include the current source dir +# to find MathFunctions.h, while we don't. +target_include_directories(MathFunctions + INTERFACE ${CMAKE_CURRENT_SOURCE_DIR} + ) diff --git a/Help/guide/tutorial/Step4/MathFunctions/MathFunctions.h b/Help/guide/tutorial/Step4/MathFunctions/MathFunctions.h new file mode 100644 index 0000000..cd36bcc --- /dev/null +++ b/Help/guide/tutorial/Step4/MathFunctions/MathFunctions.h @@ -0,0 +1 @@ +double mysqrt(double x); diff --git a/Help/guide/tutorial/Step4/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step4/MathFunctions/mysqrt.cxx new file mode 100644 index 0000000..7d9379e --- /dev/null +++ b/Help/guide/tutorial/Step4/MathFunctions/mysqrt.cxx @@ -0,0 +1,23 @@ +#include "MathFunctions.h" +#include <iostream> + +// a hack square root calculation using simple operations +double mysqrt(double x) +{ + if (x <= 0) { + return 0; + } + + double result = x; + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result * result); + result = result + 0.5 * delta / result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } + return result; +} diff --git a/Help/guide/tutorial/Step4/TutorialConfig.h.in b/Help/guide/tutorial/Step4/TutorialConfig.h.in new file mode 100644 index 0000000..e23f521 --- /dev/null +++ b/Help/guide/tutorial/Step4/TutorialConfig.h.in @@ -0,0 +1,4 @@ +// the configured options and settings for Tutorial +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ +#cmakedefine USE_MYMATH diff --git a/Help/guide/tutorial/Step4/directions.txt b/Help/guide/tutorial/Step4/directions.txt new file mode 100644 index 0000000..91e4043 --- /dev/null +++ b/Help/guide/tutorial/Step4/directions.txt @@ -0,0 +1,72 @@ +# Installing and Testing # + +Now we can start adding testing support and install rules to our project. + +The install rules are fairly simple; for MathFunctions we install the library +and header file, for the application we install the executable and configured +header. + +So to MathFunctions/CMakeLists.txt we add: + + install (TARGETS MathFunctions DESTINATION bin) + install (FILES MathFunctions.h DESTINATION include) + +And the to top-level CMakeLists.txt we add: + + install(TARGETS Tutorial DESTINATION bin) + install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h" + DESTINATION include + ) + +That is all that is needed to create a basic local install of the tutorial. + +Run cmake or cmake-gui to configure the project and then build it with your +chosen build tool. Then build the “install” target by typing 'make install' +from the command line or build the INSTALL target from an IDE. This will +install the appropriate header files, libraries, and executables. + +Verify that the installed Tutorial runs. Note: The CMake variable +CMAKE_INSTALL_PREFIX is used to determine the root of where the files will +be installed. + +Next let's test our application. Adding testing is an easy process. At the +end of the top-level CMakeLists file we can add a number of basic tests to +verify that the application is working correctly. + + # enable testing + enable_testing() + + # does the application run + add_test(NAME Runs COMMAND Tutorial 25) + + # does the usage message work? + add_test(NAME Usage COMMAND Tutorial) + set_tests_properties(Usage + PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number" + ) + + # define a function to simplify adding tests + function(do_test target arg result) + add_test(NAME Comp${arg} COMMAND ${target} ${arg}) + set_tests_properties(Comp${arg} + PROPERTIES PASS_REGULAR_EXPRESSION ${result} + ) + endfunction(do_test) + + # do a bunch of result based tests + do_test(Tutorial 25 "25 is 5") + do_test(Tutorial -25 "-25 is [-nan|nan|0]") + do_test(Tutorial 0.0001 "0.0001 is 0.01") + +The first test simply verifies that the application runs, does not segfault or +otherwise crash, and has a zero return value. This is the basic form of a CTest +test. + +The Usage test uses a regular expression to verify that the usage message +is printed when an incorrect number of arguments are provided. + +Lastly, we have a function called do_test that simplifies running the +application and verifying that the computed square root is correct for given +input. + +To run tests, cd to the binary directory and run “ctest -N” and “ctest -VV”. diff --git a/Help/guide/tutorial/Step4/tutorial.cxx b/Help/guide/tutorial/Step4/tutorial.cxx new file mode 100644 index 0000000..c2b89df --- /dev/null +++ b/Help/guide/tutorial/Step4/tutorial.cxx @@ -0,0 +1,32 @@ +// A simple program that computes the square root of a number +#include <cmath> +#include <iostream> +#include <string> + +#include "TutorialConfig.h" + +#ifdef USE_MYMATH +# include "MathFunctions.h" +#endif + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "." + << Tutorial_VERSION_MINOR << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = std::stod(argv[1]); + +#ifdef USE_MYMATH + double outputValue = mysqrt(inputValue); +#else + double outputValue = sqrt(inputValue); +#endif + + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} diff --git a/Help/guide/tutorial/Step5/CMakeLists.txt b/Help/guide/tutorial/Step5/CMakeLists.txt new file mode 100644 index 0000000..828b9fc --- /dev/null +++ b/Help/guide/tutorial/Step5/CMakeLists.txt @@ -0,0 +1,69 @@ +cmake_minimum_required(VERSION 3.3) +project(Tutorial) + +set(CMAKE_CXX_STANDARD 14) + +# should we use our own math functions +option(USE_MYMATH "Use tutorial provided math implementation" ON) + +# the version number. +set(Tutorial_VERSION_MAJOR 1) +set(Tutorial_VERSION_MINOR 0) + +# configure a header file to pass some of the CMake settings +# to the source code +configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + +# add the MathFunctions library? +if(USE_MYMATH) + add_subdirectory(MathFunctions) + list(APPEND EXTRA_LIBS MathFunctions) +endif() + +# add the executable +add_executable(Tutorial tutorial.cxx) +target_link_libraries(Tutorial PUBLIC ${EXTRA_LIBS}) + +# add the binary tree to the search path for include files +# so that we will find TutorialConfig.h +target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ) + +# add the install targets +install(TARGETS Tutorial DESTINATION bin) +install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h" + DESTINATION include + ) + +# enable testing +enable_testing() + +# does the application run +add_test(NAME Runs COMMAND Tutorial 25) + +# does the usage message work? +add_test(NAME Usage COMMAND Tutorial) +set_tests_properties(Usage + PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number" + ) + +# define a function to simplify adding tests +function(do_test target arg result) + add_test(NAME Comp${arg} COMMAND ${target} ${arg}) + set_tests_properties(Comp${arg} + PROPERTIES PASS_REGULAR_EXPRESSION ${result} + ) +endfunction(do_test) + +# do a bunch of result based tests +do_test(Tutorial 4 "4 is 2") +do_test(Tutorial 9 "9 is 3") +do_test(Tutorial 5 "5 is 2.236") +do_test(Tutorial 7 "7 is 2.645") +do_test(Tutorial 25 "25 is 5") +do_test(Tutorial -25 "-25 is [-nan|nan|0]") +do_test(Tutorial 0.0001 "0.0001 is 0.01") diff --git a/Help/guide/tutorial/Step5/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step5/MathFunctions/CMakeLists.txt new file mode 100644 index 0000000..11cf412 --- /dev/null +++ b/Help/guide/tutorial/Step5/MathFunctions/CMakeLists.txt @@ -0,0 +1,10 @@ +add_library(MathFunctions mysqrt.cxx) + +# state that anybody linking to us needs to include the current source dir +# to find MathFunctions.h, while we don't. +target_include_directories(MathFunctions + INTERFACE ${CMAKE_CURRENT_SOURCE_DIR} + ) + +install(TARGETS MathFunctions DESTINATION lib) +install(FILES MathFunctions.h DESTINATION include) diff --git a/Help/guide/tutorial/Step5/MathFunctions/MakeTable.cxx b/Help/guide/tutorial/Step5/MathFunctions/MakeTable.cxx new file mode 100644 index 0000000..ee58556 --- /dev/null +++ b/Help/guide/tutorial/Step5/MathFunctions/MakeTable.cxx @@ -0,0 +1,25 @@ +// A simple program that builds a sqrt table +#include <cmath> +#include <fstream> +#include <iostream> + +int main(int argc, char* argv[]) +{ + // make sure we have enough arguments + if (argc < 2) { + return 1; + } + + std::ofstream fout(argv[1], std::ios_base::out); + const bool fileOpen = fout.is_open(); + if (fileOpen) { + fout << "double sqrtTable[] = {" << std::endl; + for (int i = 0; i < 10; ++i) { + fout << sqrt(static_cast<double>(i)) << "," << std::endl; + } + // close the table with a zero + fout << "0};" << std::endl; + fout.close(); + } + return fileOpen ? 0 : 1; // return 0 if wrote the file +} diff --git a/Help/guide/tutorial/Step5/MathFunctions/MathFunctions.h b/Help/guide/tutorial/Step5/MathFunctions/MathFunctions.h new file mode 100644 index 0000000..cd36bcc --- /dev/null +++ b/Help/guide/tutorial/Step5/MathFunctions/MathFunctions.h @@ -0,0 +1 @@ +double mysqrt(double x); diff --git a/Help/guide/tutorial/Step5/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step5/MathFunctions/mysqrt.cxx new file mode 100644 index 0000000..7d9379e --- /dev/null +++ b/Help/guide/tutorial/Step5/MathFunctions/mysqrt.cxx @@ -0,0 +1,23 @@ +#include "MathFunctions.h" +#include <iostream> + +// a hack square root calculation using simple operations +double mysqrt(double x) +{ + if (x <= 0) { + return 0; + } + + double result = x; + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result * result); + result = result + 0.5 * delta / result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } + return result; +} diff --git a/Help/guide/tutorial/Step5/TutorialConfig.h.in b/Help/guide/tutorial/Step5/TutorialConfig.h.in new file mode 100644 index 0000000..e23f521 --- /dev/null +++ b/Help/guide/tutorial/Step5/TutorialConfig.h.in @@ -0,0 +1,4 @@ +// the configured options and settings for Tutorial +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ +#cmakedefine USE_MYMATH diff --git a/Help/guide/tutorial/Step5/directions.txt b/Help/guide/tutorial/Step5/directions.txt new file mode 100644 index 0000000..e6f5197 --- /dev/null +++ b/Help/guide/tutorial/Step5/directions.txt @@ -0,0 +1,69 @@ +# Adding System Introspection # + +Let us consider adding some code to our project that depends on features the +target platform may not have. For this example, we will add some code that +depends on whether or not the target platform has the log and exp functions. Of +course almost every platform has these functions but for this tutorial assume +that they are not common. + +If the platform has log and exp then we will use them to compute the square +root in the mysqrt function. We first test for the availability of these +functions using the CheckSymbolExists.cmake macro in the top-level CMakeLists +file as follows: + + # does this system provide the log and exp functions? + include(CheckSymbolExists) + set(CMAKE_REQUIRED_LIBRARIES "m") + check_symbol_exists(log "math.h" HAVE_LOG) + check_symbol_exists(exp "math.h" HAVE_EXP) + +Now let's add these defines to TutorialConfig.h.in so that we can use them +from mysqrt.cxx: + + // does the platform provide exp and log functions? + #cmakedefine HAVE_LOG + #cmakedefine HAVE_EXP + +Modify mysqrt.cxx to include math.h. Next, in the mysqrt function we can +provide an alternate implementation based on log and exp if they are available +on the system using the following code: + + // if we have both log and exp then use them + #if defined(HAVE_LOG) && defined (HAVE_EXP) + double result = exp(log(x)*0.5); + std::cout << "Computing sqrt of " << x << " to be " << result << " using log" << std::endl; + #else + ... + +Run cmake or cmake-gui to configure the project and then build it with your +chosen build tool. + +You will notice that even though HAVE_LOG and HAVE_EXP are both defined mysqrt +isn't using them. We should realize quickly that we have forgotten to include +TutorialConfig.h in mysqrt.cxx. We will also need to update +MathFunctions/CMakeLists.txt with where it is located. + +So let's go ahead and update MathFunctions/CMakeLists.txt to look like: + + add_library(MathFunctions mysqrt.cxx) + + target_include_directories(MathFunctions + INTERFACE ${CMAKE_CURRENT_SOURCE_DIR} + PRIVATE ${Tutorial_BINARY_DIR} + ) + + install(TARGETS MathFunctions DESTINATION lib) + install(FILES MathFunctions.h DESTINATION include) + +Now all we need to do is include TutorialConfig.h in mysqrt.cxx + +At this point you should go ahead and build the project again. + +Run the built Tutorial executable. Which function gives better results now, +Step1’s sqrt or Step5’s mysqrt? + +Exercise: Why is it important that we configure TutorialConfig.h.in after the +checks for HAVE_LOG and HAVE_EXP? What would happen if we inverted the two? + +Exercise: Is there a better place for us to save the HAVE_LOG and HAVE_EXP +values other than in TutorialConfig.h? diff --git a/Help/guide/tutorial/Step5/tutorial.cxx b/Help/guide/tutorial/Step5/tutorial.cxx new file mode 100644 index 0000000..c2b89df --- /dev/null +++ b/Help/guide/tutorial/Step5/tutorial.cxx @@ -0,0 +1,32 @@ +// A simple program that computes the square root of a number +#include <cmath> +#include <iostream> +#include <string> + +#include "TutorialConfig.h" + +#ifdef USE_MYMATH +# include "MathFunctions.h" +#endif + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "." + << Tutorial_VERSION_MINOR << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = std::stod(argv[1]); + +#ifdef USE_MYMATH + double outputValue = mysqrt(inputValue); +#else + double outputValue = sqrt(inputValue); +#endif + + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} diff --git a/Help/guide/tutorial/Step6/CMakeLists.txt b/Help/guide/tutorial/Step6/CMakeLists.txt new file mode 100644 index 0000000..a78b0ff --- /dev/null +++ b/Help/guide/tutorial/Step6/CMakeLists.txt @@ -0,0 +1,75 @@ +cmake_minimum_required(VERSION 3.3) +project(Tutorial) + +set(CMAKE_CXX_STANDARD 14) + +# the version number. +set(Tutorial_VERSION_MAJOR 1) +set(Tutorial_VERSION_MINOR 0) + +# does this system provide the log and exp functions? +include(CheckSymbolExists) +set(CMAKE_REQUIRED_LIBRARIES "m") +check_symbol_exists(log "math.h" HAVE_LOG) +check_symbol_exists(exp "math.h" HAVE_EXP) + +# should we use our own math functions +option(USE_MYMATH "Use tutorial provided math implementation" ON) + +# configure a header file to pass some of the CMake settings +# to the source code +configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + +# add the MathFunctions library? +if(USE_MYMATH) + add_subdirectory(MathFunctions) + list(APPEND EXTRA_LIBS MathFunctions) +endif() + +# add the executable +add_executable(Tutorial tutorial.cxx) +target_link_libraries(Tutorial PUBLIC ${EXTRA_LIBS}) + +# add the binary tree to the search path for include files +# so that we will find TutorialConfig.h +target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ) + +# add the install targets +install(TARGETS Tutorial DESTINATION bin) +install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h" + DESTINATION include + ) + +# enable testing +enable_testing() + +# does the application run +add_test(NAME Runs COMMAND Tutorial 25) + +# does the usage message work? +add_test(NAME Usage COMMAND Tutorial) +set_tests_properties(Usage + PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number" + ) + +# define a function to simplify adding tests +function(do_test target arg result) + add_test(NAME Comp${arg} COMMAND ${target} ${arg}) + set_tests_properties(Comp${arg} + PROPERTIES PASS_REGULAR_EXPRESSION ${result} + ) +endfunction(do_test) + +# do a bunch of result based tests +do_test(Tutorial 4 "4 is 2") +do_test(Tutorial 9 "9 is 3") +do_test(Tutorial 5 "5 is 2.236") +do_test(Tutorial 7 "7 is 2.645") +do_test(Tutorial 25 "25 is 5") +do_test(Tutorial -25 "-25 is [-nan|nan|0]") +do_test(Tutorial 0.0001 "0.0001 is 0.01") diff --git a/Help/guide/tutorial/Step6/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step6/MathFunctions/CMakeLists.txt new file mode 100644 index 0000000..2946075 --- /dev/null +++ b/Help/guide/tutorial/Step6/MathFunctions/CMakeLists.txt @@ -0,0 +1,14 @@ +add_library(MathFunctions mysqrt.cxx) + +# state that anybody linking to us needs to include the current source dir +# to find MathFunctions.h, while we don't. +# state that we depend on Tutorial_BINARY_DIR but consumers don't, as the +# TutorialConfig.h include is an implementation detail + +target_include_directories(MathFunctions + INTERFACE ${CMAKE_CURRENT_SOURCE_DIR} + PRIVATE ${Tutorial_BINARY_DIR} + ) + +install(TARGETS MathFunctions DESTINATION lib) +install(FILES MathFunctions.h DESTINATION include) diff --git a/Help/guide/tutorial/Step6/MathFunctions/MakeTable.cxx b/Help/guide/tutorial/Step6/MathFunctions/MakeTable.cxx new file mode 100644 index 0000000..ee58556 --- /dev/null +++ b/Help/guide/tutorial/Step6/MathFunctions/MakeTable.cxx @@ -0,0 +1,25 @@ +// A simple program that builds a sqrt table +#include <cmath> +#include <fstream> +#include <iostream> + +int main(int argc, char* argv[]) +{ + // make sure we have enough arguments + if (argc < 2) { + return 1; + } + + std::ofstream fout(argv[1], std::ios_base::out); + const bool fileOpen = fout.is_open(); + if (fileOpen) { + fout << "double sqrtTable[] = {" << std::endl; + for (int i = 0; i < 10; ++i) { + fout << sqrt(static_cast<double>(i)) << "," << std::endl; + } + // close the table with a zero + fout << "0};" << std::endl; + fout.close(); + } + return fileOpen ? 0 : 1; // return 0 if wrote the file +} diff --git a/Help/guide/tutorial/Step6/MathFunctions/MathFunctions.h b/Help/guide/tutorial/Step6/MathFunctions/MathFunctions.h new file mode 100644 index 0000000..cd36bcc --- /dev/null +++ b/Help/guide/tutorial/Step6/MathFunctions/MathFunctions.h @@ -0,0 +1 @@ +double mysqrt(double x); diff --git a/Help/guide/tutorial/Step6/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step6/MathFunctions/mysqrt.cxx new file mode 100644 index 0000000..b9ad20a --- /dev/null +++ b/Help/guide/tutorial/Step6/MathFunctions/mysqrt.cxx @@ -0,0 +1,33 @@ +#include "MathFunctions.h" +#include "TutorialConfig.h" +#include <iostream> + +#include <cmath> + +// a hack square root calculation using simple operations +double mysqrt(double x) +{ + if (x <= 0) { + return 0; + } + + // if we have both log and exp then use them +#if defined(HAVE_LOG) && defined(HAVE_EXP) + double result = exp(log(x) * 0.5); + std::cout << "Computing sqrt of " << x << " to be " << result << " using log" + << std::endl; +#else + double result = x; + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result * result); + result = result + 0.5 * delta / result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } +#endif + return result; +} diff --git a/Help/guide/tutorial/Step6/TutorialConfig.h.in b/Help/guide/tutorial/Step6/TutorialConfig.h.in new file mode 100644 index 0000000..e97ce24 --- /dev/null +++ b/Help/guide/tutorial/Step6/TutorialConfig.h.in @@ -0,0 +1,8 @@ +// the configured options and settings for Tutorial +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ +#cmakedefine USE_MYMATH + +// does the platform provide exp and log functions? +#cmakedefine HAVE_LOG +#cmakedefine HAVE_EXP diff --git a/Help/guide/tutorial/Step6/directions.txt b/Help/guide/tutorial/Step6/directions.txt new file mode 100644 index 0000000..42b9f06 --- /dev/null +++ b/Help/guide/tutorial/Step6/directions.txt @@ -0,0 +1,104 @@ +# Adding a Custom Command and Generated File # + +In this section we will show how you can add a generated source file into the +build process of an application. For this example, we will create a table of +precomputed square roots as part of the build process, and then compile that +table into our application. + +To accomplish this, we first need a program that will generate the table. In the +MathFunctions subdirectory a new source file named MakeTable.cxx will do just that. + + // A simple program that builds a sqrt table + #include <iostream> + #include <fstream> + #include <cmath> + + int main (int argc, char *argv[]) + { + // make sure we have enough arguments + if (argc < 2) { + return 1; + } + + std::ofstream fout(argv[1],std::ios_base::out); + const bool fileOpen = fout.is_open(); + if(fileOpen) { + fout << "double sqrtTable[] = {" << std::endl; + for (int i = 0; i < 10; ++i) { + fout << sqrt(static_cast<double>(i)) << "," << std::endl; + } + // close the table with a zero + fout << "0};" << std::endl; + fout.close(); + } + return fileOpen ? 0 : 1; // return 0 if wrote the file + } + +Note that the table is produced as valid C++ code and that the output filename +is passed in as an argument. + +The next step is to add the appropriate commands to MathFunctions’ CMakeLists +file to build the MakeTable executable and then run it as part of the build +process. A few commands are needed to accomplish this, as shown below: + + # first we add the executable that generates the table + add_executable(MakeTable MakeTable.cxx) + + # add the command to generate the source code + add_custom_command( + OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h + COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h + DEPENDS MakeTable + ) + + # add the main library + add_library(MathFunctions + mysqrt.cxx + ${CMAKE_CURRENT_BINARY_DIR}/Table.h + ) + + target_include_directories(MathFunctions + INTERFACE ${CMAKE_CURRENT_SOURCE_DIR} + PUBLIC ${Tutorial_BINARY_DIR} + # add the binary tree directory to the search path for include files + ${CMAKE_CURRENT_BINARY_DIR} + ) + + install(TARGETS MathFunctions DESTINATION lib) + install(FILES MathFunctions.h DESTINATION include) + +First, the executable for MakeTable is added as any other executable would be +added. Then we add a custom command that specifies how to produce Table.h by +running MakeTable. Next we have to let CMake know that mysqrt.cxx depends on +the generated file Table.h. This is done by adding the generated Table.h to the +list of sources for the library MathFunctions. We also have to add the current +binary directory to the list of include directories so that Table.h can be +found and included by mysqrt.cxx. + +Now let's use the generated table. First, modify mysqrt.cxx to include Table.h. +Next, we can rewrite the mysqrt function to use the table: + + if (x <= 0) { + return 0; + } + + // use the table to help find an initial value + double result = x; + if (x >= 1 && x < 10) { + result = sqrtTable[static_cast<int>(x)]; + } + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result*result); + result = result + 0.5*delta/result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } + +Run cmake or cmake-gui to configure the project and then build it with your +chosen build tool. When this project is built it will first build the MakeTable +executable. It will then run MakeTable to produce Table.h. Finally, it will +compile mysqrt.cxx which includes Table.h to produce the MathFunctions library. diff --git a/Help/guide/tutorial/Step6/tutorial.cxx b/Help/guide/tutorial/Step6/tutorial.cxx new file mode 100644 index 0000000..c2b89df --- /dev/null +++ b/Help/guide/tutorial/Step6/tutorial.cxx @@ -0,0 +1,32 @@ +// A simple program that computes the square root of a number +#include <cmath> +#include <iostream> +#include <string> + +#include "TutorialConfig.h" + +#ifdef USE_MYMATH +# include "MathFunctions.h" +#endif + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "." + << Tutorial_VERSION_MINOR << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = std::stod(argv[1]); + +#ifdef USE_MYMATH + double outputValue = mysqrt(inputValue); +#else + double outputValue = sqrt(inputValue); +#endif + + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} diff --git a/Help/guide/tutorial/Step7/CMakeLists.txt b/Help/guide/tutorial/Step7/CMakeLists.txt new file mode 100644 index 0000000..33aa039 --- /dev/null +++ b/Help/guide/tutorial/Step7/CMakeLists.txt @@ -0,0 +1,75 @@ +cmake_minimum_required(VERSION 3.3) +project(Tutorial) + +set(CMAKE_CXX_STANDARD 14) + +# the version number. +set(Tutorial_VERSION_MAJOR 1) +set(Tutorial_VERSION_MINOR 0) + +# does this system provide the log and exp functions? +include(CheckSymbolExists) +set(CMAKE_REQUIRED_LIBRARIES "m") +check_symbol_exists(log "math.h" HAVE_LOG) +check_symbol_exists(exp "math.h" HAVE_EXP) + +# should we use our own math functions +option(USE_MYMATH "Use tutorial provided math implementation" ON) + +# configure a header file to pass some of the CMake settings +# to the source code +configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + +# add the MathFunctions library? +if(USE_MYMATH) + add_subdirectory(MathFunctions) + list(APPEND EXTRA_LIBS MathFunctions) +endif(USE_MYMATH) + +# add the executable +add_executable(Tutorial tutorial.cxx) +target_link_libraries(Tutorial PUBLIC ${EXTRA_LIBS}) + +# add the binary tree to the search path for include files +# so that we will find TutorialConfig.h +target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ) + +# add the install targets +install(TARGETS Tutorial DESTINATION bin) +install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h" + DESTINATION include + ) + +# enable testing +enable_testing() + +# does the application run +add_test(NAME Runs COMMAND Tutorial 25) + +# does the usage message work? +add_test(NAME Usage COMMAND Tutorial) +set_tests_properties(Usage + PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number" + ) + +# define a function to simplify adding tests +function(do_test target arg result) + add_test(NAME Comp${arg} COMMAND ${target} ${arg}) + set_tests_properties(Comp${arg} + PROPERTIES PASS_REGULAR_EXPRESSION ${result} + ) +endfunction(do_test) + +# do a bunch of result based tests +do_test(Tutorial 4 "4 is 2") +do_test(Tutorial 9 "9 is 3") +do_test(Tutorial 5 "5 is 2.236") +do_test(Tutorial 7 "7 is 2.645") +do_test(Tutorial 25 "25 is 5") +do_test(Tutorial -25 "-25 is [-nan|nan|0]") +do_test(Tutorial 0.0001 "0.0001 is 0.01") diff --git a/Help/guide/tutorial/Step7/License.txt b/Help/guide/tutorial/Step7/License.txt new file mode 100644 index 0000000..c62d00b --- /dev/null +++ b/Help/guide/tutorial/Step7/License.txt @@ -0,0 +1,2 @@ +This is the open source License.txt file introduced in +CMake/Tutorial/Step7... diff --git a/Help/guide/tutorial/Step7/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step7/MathFunctions/CMakeLists.txt new file mode 100644 index 0000000..dc3eb98 --- /dev/null +++ b/Help/guide/tutorial/Step7/MathFunctions/CMakeLists.txt @@ -0,0 +1,29 @@ +# first we add the executable that generates the table +add_executable(MakeTable MakeTable.cxx) + +# add the command to generate the source code +add_custom_command( + OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h + COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h + DEPENDS MakeTable + ) + +# add the main library +add_library(MathFunctions + mysqrt.cxx + ${CMAKE_CURRENT_BINARY_DIR}/Table.h + ) + +# state that anybody linking to us needs to include the current source dir +# to find MathFunctions.h, while we don't. +# state that we depend on Tutorial_BINARY_DIR but consumers don't, as the +# TutorialConfig.h include is an implementation detail +# state that we depend on our binary dir to find Table.h +target_include_directories(MathFunctions + INTERFACE ${CMAKE_CURRENT_SOURCE_DIR} + PRIVATE ${Tutorial_BINARY_DIR} + ${CMAKE_CURRENT_BINARY_DIR} + ) + +install(TARGETS MathFunctions DESTINATION lib) +install(FILES MathFunctions.h DESTINATION include) diff --git a/Help/guide/tutorial/Step7/MathFunctions/MakeTable.cxx b/Help/guide/tutorial/Step7/MathFunctions/MakeTable.cxx new file mode 100644 index 0000000..ee58556 --- /dev/null +++ b/Help/guide/tutorial/Step7/MathFunctions/MakeTable.cxx @@ -0,0 +1,25 @@ +// A simple program that builds a sqrt table +#include <cmath> +#include <fstream> +#include <iostream> + +int main(int argc, char* argv[]) +{ + // make sure we have enough arguments + if (argc < 2) { + return 1; + } + + std::ofstream fout(argv[1], std::ios_base::out); + const bool fileOpen = fout.is_open(); + if (fileOpen) { + fout << "double sqrtTable[] = {" << std::endl; + for (int i = 0; i < 10; ++i) { + fout << sqrt(static_cast<double>(i)) << "," << std::endl; + } + // close the table with a zero + fout << "0};" << std::endl; + fout.close(); + } + return fileOpen ? 0 : 1; // return 0 if wrote the file +} diff --git a/Help/guide/tutorial/Step7/MathFunctions/MathFunctions.h b/Help/guide/tutorial/Step7/MathFunctions/MathFunctions.h new file mode 100644 index 0000000..cd36bcc --- /dev/null +++ b/Help/guide/tutorial/Step7/MathFunctions/MathFunctions.h @@ -0,0 +1 @@ +double mysqrt(double x); diff --git a/Help/guide/tutorial/Step7/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step7/MathFunctions/mysqrt.cxx new file mode 100644 index 0000000..5272f56 --- /dev/null +++ b/Help/guide/tutorial/Step7/MathFunctions/mysqrt.cxx @@ -0,0 +1,34 @@ +#include "MathFunctions.h" +#include "TutorialConfig.h" +#include <iostream> + +// include the generated table +#include "Table.h" + +#include <cmath> + +// a hack square root calculation using simple operations +double mysqrt(double x) +{ + if (x <= 0) { + return 0; + } + + // use the table to help find an initial value + double result = x; + if (x >= 1 && x < 10) { + result = sqrtTable[static_cast<int>(x)]; + } + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result * result); + result = result + 0.5 * delta / result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } + + return result; +} diff --git a/Help/guide/tutorial/Step7/TutorialConfig.h.in b/Help/guide/tutorial/Step7/TutorialConfig.h.in new file mode 100644 index 0000000..e97ce24 --- /dev/null +++ b/Help/guide/tutorial/Step7/TutorialConfig.h.in @@ -0,0 +1,8 @@ +// the configured options and settings for Tutorial +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ +#cmakedefine USE_MYMATH + +// does the platform provide exp and log functions? +#cmakedefine HAVE_LOG +#cmakedefine HAVE_EXP diff --git a/Help/guide/tutorial/Step7/directions.txt b/Help/guide/tutorial/Step7/directions.txt new file mode 100644 index 0000000..7d7c2ea --- /dev/null +++ b/Help/guide/tutorial/Step7/directions.txt @@ -0,0 +1,40 @@ +# Building an Installer # + +Next suppose that we want to distribute our project to other people so that they +can use it. We want to provide both binary and source distributions on a variety +of platforms. This is a little different from the install we did previously in +the Installing and Testing section (Step 4), where we were installing the +binaries that we had built from the source code. In this example we will be +building installation packages that support binary installations and package +management features. To accomplish this we will use CPack to create platform +specific installers. Specifically we need to add a few lines to the bottom of +our top-level CMakeLists.txt file. + + include(InstallRequiredSystemLibraries) + set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/License.txt") + set(CPACK_PACKAGE_VERSION_MAJOR "${Tutorial_VERSION_MAJOR}") + set(CPACK_PACKAGE_VERSION_MINOR "${Tutorial_VERSION_MINOR}") + include(CPack) + +That is all there is to it. We start by including InstallRequiredSystemLibraries. +This module will include any runtime libraries that are needed by the project +for the current platform. Next we set some CPack variables to where we have +stored the license and version information for this project. The version +information makes use of the variables we set earlier in this tutorial. Finally +we include the CPack module which will use these variables and some other +properties of the system you are on to setup an installer. + +The next step is to build the project in the usual manner and then run CPack +on it. To build a binary distribution you would run: + + cpack + +To create a source distribution you would type: + + cpack -C CPackSourceConfig.cmake + +Alternatively, run “make package” or right click the Package target and +“Build Project” from an IDE. + +Run the installer executable found in the binary directory. Then run the +installed executable and verify that it works. diff --git a/Help/guide/tutorial/Step7/tutorial.cxx b/Help/guide/tutorial/Step7/tutorial.cxx new file mode 100644 index 0000000..c2b89df --- /dev/null +++ b/Help/guide/tutorial/Step7/tutorial.cxx @@ -0,0 +1,32 @@ +// A simple program that computes the square root of a number +#include <cmath> +#include <iostream> +#include <string> + +#include "TutorialConfig.h" + +#ifdef USE_MYMATH +# include "MathFunctions.h" +#endif + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "." + << Tutorial_VERSION_MINOR << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = std::stod(argv[1]); + +#ifdef USE_MYMATH + double outputValue = mysqrt(inputValue); +#else + double outputValue = sqrt(inputValue); +#endif + + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} diff --git a/Help/guide/tutorial/Step8/CMakeLists.txt b/Help/guide/tutorial/Step8/CMakeLists.txt new file mode 100644 index 0000000..03dc7c0 --- /dev/null +++ b/Help/guide/tutorial/Step8/CMakeLists.txt @@ -0,0 +1,81 @@ +cmake_minimum_required(VERSION 3.3) +project(Tutorial) + +set(CMAKE_CXX_STANDARD 14) + +# the version number. +set(Tutorial_VERSION_MAJOR 1) +set(Tutorial_VERSION_MINOR 0) + +# does this system provide the log and exp functions? +include(CheckSymbolExists) +set(CMAKE_REQUIRED_LIBRARIES "m") +check_symbol_exists(log "math.h" HAVE_LOG) +check_symbol_exists(exp "math.h" HAVE_EXP) + +# should we use our own math functions +option(USE_MYMATH "Use tutorial provided math implementation" ON) + +# configure a header file to pass some of the CMake settings +# to the source code +configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + +# add the MathFunctions library? +if(USE_MYMATH) + add_subdirectory(MathFunctions) + list(APPEND EXTRA_LIBS MathFunctions) +endif(USE_MYMATH) + +# add the executable +add_executable(Tutorial tutorial.cxx) +target_link_libraries(Tutorial PUBLIC ${EXTRA_LIBS}) + +# add the binary tree to the search path for include files +# so that we will find TutorialConfig.h +target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ) + +# add the install targets +install(TARGETS Tutorial DESTINATION bin) +install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h" + DESTINATION include + ) + +# enable testing +enable_testing() + +# does the application run +add_test(NAME Runs COMMAND Tutorial 25) + +# does the usage message work? +add_test(NAME Usage COMMAND Tutorial) +set_tests_properties(Usage + PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number" + ) + +# define a function to simplify adding tests +function(do_test target arg result) +add_test(NAME Comp${arg} COMMAND ${target} ${arg}) + set_tests_properties(Comp${arg} + PROPERTIES PASS_REGULAR_EXPRESSION ${result} + ) +endfunction(do_test) + +# do a bunch of result based tests +do_test(Tutorial 4 "4 is 2") +do_test(Tutorial 9 "9 is 3") +do_test(Tutorial 5 "5 is 2.236") +do_test(Tutorial 7 "7 is 2.645") +do_test(Tutorial 25 "25 is 5") +do_test(Tutorial -25 "-25 is [-nan|nan|0]") +do_test(Tutorial 0.0001 "0.0001 is 0.01") + +include(InstallRequiredSystemLibraries) +set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/License.txt") +set(CPACK_PACKAGE_VERSION_MAJOR "${Tutorial_VERSION_MAJOR}") +set(CPACK_PACKAGE_VERSION_MINOR "${Tutorial_VERSION_MINOR}") +include(CPack) diff --git a/Help/guide/tutorial/Step8/License.txt b/Help/guide/tutorial/Step8/License.txt new file mode 100644 index 0000000..c62d00b --- /dev/null +++ b/Help/guide/tutorial/Step8/License.txt @@ -0,0 +1,2 @@ +This is the open source License.txt file introduced in +CMake/Tutorial/Step7... diff --git a/Help/guide/tutorial/Step8/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step8/MathFunctions/CMakeLists.txt new file mode 100644 index 0000000..dc3eb98 --- /dev/null +++ b/Help/guide/tutorial/Step8/MathFunctions/CMakeLists.txt @@ -0,0 +1,29 @@ +# first we add the executable that generates the table +add_executable(MakeTable MakeTable.cxx) + +# add the command to generate the source code +add_custom_command( + OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h + COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h + DEPENDS MakeTable + ) + +# add the main library +add_library(MathFunctions + mysqrt.cxx + ${CMAKE_CURRENT_BINARY_DIR}/Table.h + ) + +# state that anybody linking to us needs to include the current source dir +# to find MathFunctions.h, while we don't. +# state that we depend on Tutorial_BINARY_DIR but consumers don't, as the +# TutorialConfig.h include is an implementation detail +# state that we depend on our binary dir to find Table.h +target_include_directories(MathFunctions + INTERFACE ${CMAKE_CURRENT_SOURCE_DIR} + PRIVATE ${Tutorial_BINARY_DIR} + ${CMAKE_CURRENT_BINARY_DIR} + ) + +install(TARGETS MathFunctions DESTINATION lib) +install(FILES MathFunctions.h DESTINATION include) diff --git a/Help/guide/tutorial/Step8/MathFunctions/MakeTable.cxx b/Help/guide/tutorial/Step8/MathFunctions/MakeTable.cxx new file mode 100644 index 0000000..ee58556 --- /dev/null +++ b/Help/guide/tutorial/Step8/MathFunctions/MakeTable.cxx @@ -0,0 +1,25 @@ +// A simple program that builds a sqrt table +#include <cmath> +#include <fstream> +#include <iostream> + +int main(int argc, char* argv[]) +{ + // make sure we have enough arguments + if (argc < 2) { + return 1; + } + + std::ofstream fout(argv[1], std::ios_base::out); + const bool fileOpen = fout.is_open(); + if (fileOpen) { + fout << "double sqrtTable[] = {" << std::endl; + for (int i = 0; i < 10; ++i) { + fout << sqrt(static_cast<double>(i)) << "," << std::endl; + } + // close the table with a zero + fout << "0};" << std::endl; + fout.close(); + } + return fileOpen ? 0 : 1; // return 0 if wrote the file +} diff --git a/Help/guide/tutorial/Step8/MathFunctions/MathFunctions.h b/Help/guide/tutorial/Step8/MathFunctions/MathFunctions.h new file mode 100644 index 0000000..cd36bcc --- /dev/null +++ b/Help/guide/tutorial/Step8/MathFunctions/MathFunctions.h @@ -0,0 +1 @@ +double mysqrt(double x); diff --git a/Help/guide/tutorial/Step8/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step8/MathFunctions/mysqrt.cxx new file mode 100644 index 0000000..5b862fb --- /dev/null +++ b/Help/guide/tutorial/Step8/MathFunctions/mysqrt.cxx @@ -0,0 +1,42 @@ +#include "MathFunctions.h" +#include "TutorialConfig.h" +#include <iostream> + +// include the generated table +#include "Table.h" + +#include <cmath> + +// a hack square root calculation using simple operations +double mysqrt(double x) +{ + if (x <= 0) { + return 0; + } + + // if we have both log and exp then use them +#if defined(HAVE_LOG) && defined(HAVE_EXP) + double result = exp(log(x) * 0.5); + std::cout << "Computing sqrt of " << x << " to be " << result << " using log" + << std::endl; +#else + // use the table to help find an initial value + double result = x; + if (x >= 1 && x < 10) { + result = sqrtTable[static_cast<int>(x)]; + } + + // if we have both log and exp then use them + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result * result); + result = result + 0.5 * delta / result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } +#endif + return result; +} diff --git a/Help/guide/tutorial/Step8/TutorialConfig.h.in b/Help/guide/tutorial/Step8/TutorialConfig.h.in new file mode 100644 index 0000000..e97ce24 --- /dev/null +++ b/Help/guide/tutorial/Step8/TutorialConfig.h.in @@ -0,0 +1,8 @@ +// the configured options and settings for Tutorial +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ +#cmakedefine USE_MYMATH + +// does the platform provide exp and log functions? +#cmakedefine HAVE_LOG +#cmakedefine HAVE_EXP diff --git a/Help/guide/tutorial/Step8/directions.txt b/Help/guide/tutorial/Step8/directions.txt new file mode 100644 index 0000000..588d9c6 --- /dev/null +++ b/Help/guide/tutorial/Step8/directions.txt @@ -0,0 +1,38 @@ +# Adding Support for a Dashboard # + +Adding support for submitting our test results to a dashboard is very easy. We +already defined a number of tests for our project in the earlier steps of this +tutorial. We just have to run those tests and submit them to a dashboard. To +include support for dashboards we include the CTest module in our top-level +CMakeLists.txt. + +Replace: + # enable testing + enable_testing() + +With: + # enable dashboard scripting + include(CTest) + +The CTest module will automatically call enable_testing(), so +we can remove it from our CMake files. + +We will also need to create a CTestConfig.cmake file where we can specify the +name of the project and where to submit the dashboard. + + set(CTEST_PROJECT_NAME "CMakeTutorial") + set(CTEST_NIGHTLY_START_TIME "01:00:00 UTC") + + set(CTEST_DROP_METHOD "http") + set(CTEST_DROP_SITE "my.cdash.org/") + set(CTEST_DROP_LOCATION "/submit.php?project=CMakeTutorial") + set(CTEST_DROP_SITE_CDASH TRUE) + +CTest will read in this file when it runs. To create a simple dashboard you can +run cmake or cmake-gui to configure the project, but do not build it yet. +Instead, change directory to the binary tree, and then run: + 'ctest [-VV] –D Experimental'. On Windows, build the EXPERIMENTAL target. + +Ctest will build and test the project and submit results to the Kitware public +dashboard. The results of your dashboard will be uploaded to Kitware's public +dashboard here: https://my.cdash.org/index.php?project=CMakeTutorial. diff --git a/Help/guide/tutorial/Step8/tutorial.cxx b/Help/guide/tutorial/Step8/tutorial.cxx new file mode 100644 index 0000000..c2b89df --- /dev/null +++ b/Help/guide/tutorial/Step8/tutorial.cxx @@ -0,0 +1,32 @@ +// A simple program that computes the square root of a number +#include <cmath> +#include <iostream> +#include <string> + +#include "TutorialConfig.h" + +#ifdef USE_MYMATH +# include "MathFunctions.h" +#endif + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "." + << Tutorial_VERSION_MINOR << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = std::stod(argv[1]); + +#ifdef USE_MYMATH + double outputValue = mysqrt(inputValue); +#else + double outputValue = sqrt(inputValue); +#endif + + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} diff --git a/Help/guide/tutorial/Step9/CMakeLists.txt b/Help/guide/tutorial/Step9/CMakeLists.txt new file mode 100644 index 0000000..4981fe2 --- /dev/null +++ b/Help/guide/tutorial/Step9/CMakeLists.txt @@ -0,0 +1,80 @@ +cmake_minimum_required(VERSION 3.3) +project(Tutorial) + +set(CMAKE_CXX_STANDARD 14) + +# the version number. +set(Tutorial_VERSION_MAJOR 1) +set(Tutorial_VERSION_MINOR 0) + +# does this system provide the log and exp functions? +include(CheckSymbolExists) +set(CMAKE_REQUIRED_LIBRARIES "m") +check_symbol_exists(log "math.h" HAVE_LOG) +check_symbol_exists(exp "math.h" HAVE_EXP) + +# should we use our own math functions +option(USE_MYMATH "Use tutorial provided math implementation" ON) + +# configure a header file to pass the version number only +configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + +# add the MathFunctions library? +if(USE_MYMATH) + add_subdirectory(MathFunctions) + list(APPEND EXTRA_LIBS MathFunctions) +endif() + +# add the executable +add_executable(Tutorial tutorial.cxx) +target_link_libraries(Tutorial PUBLIC ${EXTRA_LIBS}) + +# add the binary tree to the search path for include files +# so that we will find TutorialConfig.h +target_include_directories(Tutorial PUBLIC + "${PROJECT_BINARY_DIR}" + ) + +# add the install targets +install(TARGETS Tutorial DESTINATION bin) +install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h" + DESTINATION include + ) + +# enable testing +include(CTest) + +# does the application run +add_test(NAME Runs COMMAND Tutorial 25) + +# does the usage message work? +add_test(NAME Usage COMMAND Tutorial) +set_tests_properties(Usage + PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number" + ) + +# define a function to simplify adding tests +function(do_test target arg result) + add_test(NAME Comp${arg} COMMAND ${target} ${arg}) + set_tests_properties(Comp${arg} + PROPERTIES PASS_REGULAR_EXPRESSION ${result} + ) +endfunction(do_test) + +# do a bunch of result based tests +do_test(Tutorial 4 "4 is 2") +do_test(Tutorial 9 "9 is 3") +do_test(Tutorial 5 "5 is 2.236") +do_test(Tutorial 7 "7 is 2.645") +do_test(Tutorial 25 "25 is 5") +do_test(Tutorial -25 "-25 is [-nan|nan|0]") +do_test(Tutorial 0.0001 "0.0001 is 0.01") + +include(InstallRequiredSystemLibraries) +set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/License.txt") +set(CPACK_PACKAGE_VERSION_MAJOR "${Tutorial_VERSION_MAJOR}") +set(CPACK_PACKAGE_VERSION_MINOR "${Tutorial_VERSION_MINOR}") +include(CPack) diff --git a/Help/guide/tutorial/Step9/CTestConfig.cmake b/Help/guide/tutorial/Step9/CTestConfig.cmake new file mode 100644 index 0000000..7a927ac --- /dev/null +++ b/Help/guide/tutorial/Step9/CTestConfig.cmake @@ -0,0 +1,15 @@ +## This file should be placed in the root directory of your project. +## Then modify the CMakeLists.txt file in the root directory of your +## project to incorporate the testing dashboard. +## +## # The following are required to submit to the CDash dashboard: +## ENABLE_TESTING() +## INCLUDE(CTest) + +set(CTEST_PROJECT_NAME "CMakeTutorial") +set(CTEST_NIGHTLY_START_TIME "00:00:00 EST") + +set(CTEST_DROP_METHOD "http") +set(CTEST_DROP_SITE "my.cdash.org") +set(CTEST_DROP_LOCATION "/submit.php?project=CMakeTutorial") +set(CTEST_DROP_SITE_CDASH TRUE) diff --git a/Help/guide/tutorial/Step9/License.txt b/Help/guide/tutorial/Step9/License.txt new file mode 100644 index 0000000..c62d00b --- /dev/null +++ b/Help/guide/tutorial/Step9/License.txt @@ -0,0 +1,2 @@ +This is the open source License.txt file introduced in +CMake/Tutorial/Step7... diff --git a/Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt new file mode 100644 index 0000000..e651a57 --- /dev/null +++ b/Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt @@ -0,0 +1,35 @@ +# first we add the executable that generates the table +add_executable(MakeTable MakeTable.cxx) + +# add the command to generate the source code +add_custom_command( + OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h + COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h + DEPENDS MakeTable + ) + +# add the main library +add_library(MathFunctions + mysqrt.cxx + ${CMAKE_CURRENT_BINARY_DIR}/Table.h + ) + +# state that anybody linking to us needs to include the current source dir +# to find MathFunctions.h, while we don't. +# state that we depend on our binary dir to find Table.h +target_include_directories(MathFunctions + INTERFACE ${CMAKE_CURRENT_SOURCE_DIR} + PRIVATE ${CMAKE_CURRENT_BINARY_DIR} + ) + +# use compile definitions to state if we have enabled USE_MYMATH +# and that anything that links to use will get this define +target_compile_definitions(MathFunctions INTERFACE "USE_MYMATH") + +if(HAVE_LOG AND HAVE_EXP) + target_compile_definitions(MathFunctions + PRIVATE "HAVE_LOG" "HAVE_EXP") +endif() + +install(TARGETS MathFunctions DESTINATION lib) +install(FILES MathFunctions.h DESTINATION include) diff --git a/Help/guide/tutorial/Step9/MathFunctions/MakeTable.cxx b/Help/guide/tutorial/Step9/MathFunctions/MakeTable.cxx new file mode 100644 index 0000000..ee58556 --- /dev/null +++ b/Help/guide/tutorial/Step9/MathFunctions/MakeTable.cxx @@ -0,0 +1,25 @@ +// A simple program that builds a sqrt table +#include <cmath> +#include <fstream> +#include <iostream> + +int main(int argc, char* argv[]) +{ + // make sure we have enough arguments + if (argc < 2) { + return 1; + } + + std::ofstream fout(argv[1], std::ios_base::out); + const bool fileOpen = fout.is_open(); + if (fileOpen) { + fout << "double sqrtTable[] = {" << std::endl; + for (int i = 0; i < 10; ++i) { + fout << sqrt(static_cast<double>(i)) << "," << std::endl; + } + // close the table with a zero + fout << "0};" << std::endl; + fout.close(); + } + return fileOpen ? 0 : 1; // return 0 if wrote the file +} diff --git a/Help/guide/tutorial/Step9/MathFunctions/MathFunctions.cxx b/Help/guide/tutorial/Step9/MathFunctions/MathFunctions.cxx new file mode 100644 index 0000000..5351184 --- /dev/null +++ b/Help/guide/tutorial/Step9/MathFunctions/MathFunctions.cxx @@ -0,0 +1,18 @@ + +#include "MathFunctions.h" +#include <cmath> + +#ifdef USE_MYMATH +# include "mysqrt.h" +#endif + +namespace mathfunctions { +double sqrt(double x) +{ +#ifdef USE_MYMATH + return detail::mysqrt(x); +#else + return std::sqrt(x); +#endif +} +} diff --git a/Help/guide/tutorial/Step9/MathFunctions/MathFunctions.h b/Help/guide/tutorial/Step9/MathFunctions/MathFunctions.h new file mode 100644 index 0000000..cd36bcc --- /dev/null +++ b/Help/guide/tutorial/Step9/MathFunctions/MathFunctions.h @@ -0,0 +1 @@ +double mysqrt(double x); diff --git a/Help/guide/tutorial/Step9/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step9/MathFunctions/mysqrt.cxx new file mode 100644 index 0000000..8b82141 --- /dev/null +++ b/Help/guide/tutorial/Step9/MathFunctions/mysqrt.cxx @@ -0,0 +1,41 @@ +#include "MathFunctions.h" +#include <iostream> + +// include the generated table +#include "Table.h" + +#include <cmath> + +// a hack square root calculation using simple operations +double mysqrt(double x) +{ + if (x <= 0) { + return 0; + } + + // if we have both log and exp then use them +#if defined(HAVE_LOG) && defined(HAVE_EXP) + double result = exp(log(x) * 0.5); + std::cout << "Computing sqrt of " << x << " to be " << result << " using log" + << std::endl; +#else + // use the table to help find an initial value + double result = x; + if (x >= 1 && x < 10) { + result = sqrtTable[static_cast<int>(x)]; + } + + // if we have both log and exp then use them + + // do ten iterations + for (int i = 0; i < 10; ++i) { + if (result <= 0) { + result = 0.1; + } + double delta = x - (result * result); + result = result + 0.5 * delta / result; + std::cout << "Computing sqrt of " << x << " to be " << result << std::endl; + } +#endif + return result; +} diff --git a/Help/guide/tutorial/Step9/MathFunctions/mysqrt.h b/Help/guide/tutorial/Step9/MathFunctions/mysqrt.h new file mode 100644 index 0000000..e1c42ef --- /dev/null +++ b/Help/guide/tutorial/Step9/MathFunctions/mysqrt.h @@ -0,0 +1,6 @@ + +namespace mathfunctions { +namespace detail { +double mysqrt(double x); +} +} diff --git a/Help/guide/tutorial/Step9/TutorialConfig.h.in b/Help/guide/tutorial/Step9/TutorialConfig.h.in new file mode 100644 index 0000000..8cd2fc9 --- /dev/null +++ b/Help/guide/tutorial/Step9/TutorialConfig.h.in @@ -0,0 +1,3 @@ +// the configured version number +#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@ +#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@ diff --git a/Help/guide/tutorial/Step9/directions.txt b/Help/guide/tutorial/Step9/directions.txt new file mode 100644 index 0000000..8771637 --- /dev/null +++ b/Help/guide/tutorial/Step9/directions.txt @@ -0,0 +1,166 @@ +# Mixing Static and Shared # + +In this section we will show how by using the BUILD_SHARED_LIBS variable we can +control the default behavior of add_library, and allow control over how +libraries without an explicit type ( STATIC/SHARED/MODULE/OBJECT ) are built. + +To accomplish this we need to add BUILD_SHARED_LIBS to the top level +CMakeLists.txt. We use the option command as it allows users to optionally +select if the value should be On or Off. + +Next we are going to refactor MathFunctions to become a real library that +encapsulates using mysqrt or sqrt, instead of requiring the calling code +to do this logic. This will also mean that USE_MYMATH will not control building +MathFuctions, but instead will control the behavior of this library. + +The first step is to update the starting section of the top level CMakeLists.txt +to look like: + + cmake_minimum_required(VERSION 3.3) + project(Tutorial) + + # control where the static and shared libraries are built so that on windows + # we don't need to tinker with the path to run the executable + set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") + set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}") + + set(CMAKE_CXX_STANDARD 11) + set(CMAKE_CXX_STANDARD_REQUIRED True) + + option(BUILD_SHARED_LIBS "Build using shared libraries" ON) + + # the version number. + set(Tutorial_VERSION_MAJOR 1) + set(Tutorial_VERSION_MINOR 0) + + # configure a header file to pass the version number only + configure_file( + "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in" + "${PROJECT_BINARY_DIR}/TutorialConfig.h" + ) + + # add the MathFunctions library + add_subdirectory(MathFunctions) + + # add the executable + add_executable(Tutorial tutorial.cxx) + target_link_libraries(Tutorial PUBLIC MathFunctions) + +Now that we have made MathFunctions always be used, we will need to update +the logic of that library. So, in MathFunctions/CMakeLists.txt we need to +create a SqrtLibrary that will conditionally be built when USE_MYMATH is +enabled. Now, since this is a tutorial, we are going to explicitly require +that SqrtLibrary is built statically. + +The end result is that MathFunctions/CMakeLists.txt should look like: + + # add the library that runs + add_library(MathFunctions MathFunctions.cxx) + + # state that anybody linking to us needs to include the current source dir + # to find MathFunctions.h, while we don't. + target_include_directories(MathFunctions + INTERFACE ${CMAKE_CURRENT_SOURCE_DIR} + ) + + # should we use our own math functions + option(USE_MYMATH "Use tutorial provided math implementation" ON) + if(USE_MYMATH) + + # does this system provide the log and exp functions? + include(CheckSymbolExists) + set(CMAKE_REQUIRED_LIBRARIES "m") + check_symbol_exists(log "math.h" HAVE_LOG) + check_symbol_exists(exp "math.h" HAVE_EXP) + + # first we add the executable that generates the table + add_executable(MakeTable MakeTable.cxx) + + # add the command to generate the source code + add_custom_command( + OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h + COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h + DEPENDS MakeTable + ) + + # library that just does sqrt + add_library(SqrtLibrary STATIC + mysqrt.cxx + ${CMAKE_CURRENT_BINARY_DIR}/Table.h + ) + + # state that we depend on our binary dir to find Table.h + target_include_directories(SqrtLibrary PRIVATE + ${CMAKE_CURRENT_BINARY_DIR} + ) + + target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH") + if(HAVE_LOG AND HAVE_EXP) + target_compile_definitions(SqrtLibrary + PRIVATE "HAVE_LOG" "HAVE_EXP") + endif() + + target_link_libraries(MathFunctions PRIVATE SqrtLibrary) + endif() + + # define the symbol stating we are using the declspec(dllexport) when + # building on windows + target_compile_definitions(MathFunctions PRIVATE "EXPORTING_MYMATH") + + install(TARGETS MathFunctions DESTINATION lib) + install(FILES MathFunctions.h DESTINATION include) + +Next, update MathFunctions/mysqrt.cxx to use the mathfunctions and detail namespaces: + + #include <iostream> + #include "MathFunctions.h" + + // include the generated table + #include "Table.h" + + #include <cmath> + + namespace mathfunctions { + namespace detail { + // a hack square root calculation using simple operations + double mysqrt(double x) + { + ... + + return result; + } + } + } + +We also need to make some changes in tutorial.cxx, so that it no longer uses USE_MYMATH: +1. Always include MathFunctions.h +2. Always use mathfunctions::sqrt + +Finally, update MathFunctions/MathFunctions.h to use dll export defines: + + #if defined(_WIN32) + #if defined(EXPORTING_MYMATH) + #define DECLSPEC __declspec(dllexport) + #else + #define DECLSPEC __declspec(dllimport) + #endif + #else //non windows + #define DECLSPEC + #endif + + namespace mathfunctions + { + double DECLSPEC sqrt(double x); + } + +At this point, if you build everything, you will notice that linking fails +as we are combining a static library without position enabled code with a +library that has position enabled code. This solution to this is to explicitly +set the POSITION_INDEPENDENT_CODE target property of SqrtLibrary to be True no +matter the build type. + +Exercise: We modified MathFunctions.h to use dll export defines. Using CMake +documentation can you find a helper module to simplify this? + +Exercise: Determine what command is enabling PIC for SqrtLibrary. +What happens if we remove said command? diff --git a/Help/guide/tutorial/Step9/tutorial.cxx b/Help/guide/tutorial/Step9/tutorial.cxx new file mode 100644 index 0000000..6c41859 --- /dev/null +++ b/Help/guide/tutorial/Step9/tutorial.cxx @@ -0,0 +1,33 @@ +// A simple program that computes the square root of a number +#include <cmath> +#include <iostream> +#include <sstream> +#include <string> + +#include "TutorialConfig.h" + +#ifdef USE_MYMATH +# include "MathFunctions.h" +#endif + +int main(int argc, char* argv[]) +{ + if (argc < 2) { + std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "." + << Tutorial_VERSION_MINOR << std::endl; + std::cout << "Usage: " << argv[0] << " number" << std::endl; + return 1; + } + + double inputValue = std::stod(argv[1]); + +#ifdef USE_MYMATH + double outputValue = mysqrt(inputValue); +#else + double outputValue = sqrt(inputValue); +#endif + + std::cout << "The square root of " << inputValue << " is " << outputValue + << std::endl; + return 0; +} |