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cmake_minimum_required(VERSION 3.1.0)
project(WriteCompilerDetectionHeader)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
include(WriteCompilerDetectionHeader)
get_property(cxx_known_features GLOBAL PROPERTY CMAKE_CXX_KNOWN_FEATURES)
get_property(c_known_features GLOBAL PROPERTY CMAKE_C_KNOWN_FEATURES)
write_compiler_detection_header(
FILE "${CMAKE_CURRENT_BINARY_DIR}/test_compiler_detection.h"
PREFIX TEST
COMPILERS GNU Clang AppleClang MSVC
VERSION 3.1
PROLOG "// something"
EPILOG "// more"
FEATURES
${cxx_known_features} ${c_known_features}
)
if (NOT CMAKE_CXX_COMPILE_FEATURES AND NOT CMAKE_C_COMPILE_FEATURES)
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/dummy.cpp"
"int main(int,char**) { return 0; }\n"
)
add_executable(WriteCompilerDetectionHeader "${CMAKE_CURRENT_BINARY_DIR}/dummy.cpp")
include(CheckCXXSourceCompiles)
check_cxx_source_compiles("#include \"${CMAKE_CURRENT_BINARY_DIR}/test_compiler_detection.h\"\nint main() { return 0; }\n"
file_include_works
)
if (file_include_works)
message(SEND_ERROR "Inclusion of ${CMAKE_CURRENT_BINARY_DIR}/test_compiler_detection.h was expected to cause an error, but did not.")
endif()
return()
endif()
string(REGEX REPLACE "^([0-9]+)\\.[0-9]+\\.[0-9]+.*" "\\1" COMPILER_VERSION_MAJOR "${CMAKE_CXX_COMPILER_VERSION}")
string(REGEX REPLACE "^[0-9]+\\.([0-9]+)\\.[0-9]+.*" "\\1" COMPILER_VERSION_MINOR "${CMAKE_CXX_COMPILER_VERSION}")
string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" COMPILER_VERSION_PATCH "${CMAKE_CXX_COMPILER_VERSION}")
macro(set_defines target true_defs false_defs)
set(defines)
foreach(def ${true_defs})
list(APPEND defines ${def}=1)
endforeach()
foreach(def ${false_defs})
list(APPEND defines ${def}=0)
endforeach()
target_compile_definitions(${target}
PRIVATE
${defines}
EXPECTED_COMPILER_VERSION_MAJOR=${COMPILER_VERSION_MAJOR}
EXPECTED_COMPILER_VERSION_MINOR=${COMPILER_VERSION_MINOR}
EXPECTED_COMPILER_VERSION_PATCH=${COMPILER_VERSION_PATCH}
)
endmacro()
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU"
OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang"
OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
# False for C++98 mode.
list(APPEND false_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
list(APPEND false_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
endif()
# for msvc the compiler version determines which c++11 features are available.
# Both variadic templates and delegating constructors support exist in
# all versions that we write compile headers for.
if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC" AND
";${CMAKE_CXX_COMPILE_FEATURES};" MATCHES ";cxx_delegating_constructors;")
list(APPEND true_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
list(APPEND true_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
else(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
list(APPEND false_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
list(APPEND false_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
endif()
if (CMAKE_C_COMPILER_ID STREQUAL "GNU"
OR CMAKE_C_COMPILER_ID STREQUAL "Clang"
OR CMAKE_C_COMPILER_ID STREQUAL "AppleClang")
add_executable(C_undefined c_undefined.c)
set_property(TARGET C_undefined PROPERTY CXX_STANDARD 90)
target_compile_options(C_undefined PRIVATE -Werror=undef)
endif()
add_executable(WriteCompilerDetectionHeader main.cpp)
set_property(TARGET WriteCompilerDetectionHeader PROPERTY CXX_STANDARD 98)
set_defines(WriteCompilerDetectionHeader "${true_defs}" "${false_defs}")
write_compiler_detection_header(
FILE "${CMAKE_CURRENT_BINARY_DIR}/compiler_multi_files/multi_file_compiler_detection.h"
PREFIX MULTI
OUTPUT_FILES_VAR multi_files
OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/compiler_multi_files/compiler_support"
COMPILERS GNU Clang AppleClang MSVC
VERSION 3.1
FEATURES
${cxx_known_features} ${c_known_features}
)
add_executable(multi_files multi_files.cpp)
set_property(TARGET multi_files PROPERTY CXX_STANDARD 98)
target_include_directories(multi_files PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/compiler_multi_files)
set_defines(multi_files "${true_defs}" "${false_defs}")
if(MSVC)
return() # MSVC has only one mode.
endif()
# Since GNU 4.7
if (";${CMAKE_CXX_COMPILE_FEATURES};" MATCHES ";cxx_delegating_constructors;")
list(APPEND true_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
list(REMOVE_ITEM false_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
endif()
# Since GNU 4.4
if (";${CMAKE_CXX_COMPILE_FEATURES};" MATCHES ";cxx_variadic_templates;")
list(APPEND true_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
list(REMOVE_ITEM false_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
endif()
add_executable(WriteCompilerDetectionHeader_11 main.cpp)
set_property(TARGET WriteCompilerDetectionHeader_11 PROPERTY CXX_STANDARD 11)
set_defines(WriteCompilerDetectionHeader_11 "${true_defs}" "${false_defs}")
add_executable(multi_files_11 multi_files.cpp)
set_property(TARGET multi_files_11 PROPERTY CXX_STANDARD 11)
target_include_directories(multi_files_11 PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/compiler_multi_files)
set_defines(multi_files_11 "${true_defs}" "${false_defs}")
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