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# 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)
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