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cmake_minimum_required(VERSION 3.0)
project(CompileFeatures)
if (NOT CMAKE_C_COMPILE_FEATURES AND NOT CMAKE_CXX_COMPILE_FEATURES)
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/dummy.cpp"
"int main(int,char**) { return 0; }\n"
)
add_executable(CompileFeatures "${CMAKE_CURRENT_BINARY_DIR}/dummy.cpp")
return()
endif()
macro(run_test feature lang)
if (";${CMAKE_${lang}_COMPILE_FEATURES};" MATCHES ${feature})
add_library(test_${feature} OBJECT ${feature})
set_property(TARGET test_${feature}
PROPERTY COMPILE_FEATURES "${feature}"
)
else()
list(APPEND ${lang}_non_features ${feature})
endif()
endmacro()
get_property(c_features GLOBAL PROPERTY CMAKE_C_KNOWN_FEATURES)
foreach(feature ${c_features})
run_test(${feature} C)
endforeach()
get_property(cxx_features GLOBAL PROPERTY CMAKE_CXX_KNOWN_FEATURES)
foreach(feature ${cxx_features})
run_test(${feature} CXX)
endforeach()
if (CMAKE_CXX_COMPILER_ID STREQUAL GNU
AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
list(REMOVE_ITEM CXX_non_features
cxx_alignof
)
endif()
if (CMAKE_CXX_COMPILER_ID STREQUAL GNU
AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
# GNU prior to 4.9 does not set any preprocessor define to distinguish
# c++1y from c++11, so CMake does not support c++1y features before GNU 4.9.
list(REMOVE_ITEM CXX_non_features
# GNU 4.8 knows cxx_attributes, but doesn't know [[deprecated]]
# and warns that it is unknown and ignored.
cxx_attribute_deprecated
cxx_binary_literals
cxx_lambda_init_captures
cxx_return_type_deduction
)
endif()
set(C_ext c)
set(C_standard_flag 11)
set(CXX_ext cpp)
set(CXX_standard_flag 14)
foreach(lang CXX C)
if (CMAKE_${lang}_COMPILE_FEATURES)
foreach(feature ${${lang}_non_features})
message("Testing feature : ${feature}")
try_compile(${feature}_works
"${CMAKE_CURRENT_BINARY_DIR}/${feature}_test"
"${CMAKE_CURRENT_SOURCE_DIR}/feature_test.${${lang}_ext}"
COMPILE_DEFINITIONS "-DTEST=${CMAKE_CURRENT_SOURCE_DIR}/${feature}.${${lang}_ext}"
CMAKE_FLAGS "-DCMAKE_${lang}_STANDARD=${${lang}_standard_flag}"
OUTPUT_VARIABLE OUTPUT
)
if (${feature}_works)
message(SEND_ERROR
"Feature ${feature} expected not to work for ${lang} ${CMAKE_${lang}_COMPILER_ID}-${CMAKE_${lang}_COMPILER_VERSION}.
Update the supported features or blacklist it.\n${OUTPUT}")
else()
message("Testing feature : ${feature} -- Fails, as expected.")
endif()
endforeach()
endif()
endforeach()
if (CMAKE_C_COMPILE_FEATURES)
string(FIND "${CMAKE_C_FLAGS}" "-std=" std_flag_idx)
if (std_flag_idx EQUAL -1)
add_executable(default_dialect_C default_dialect.c)
target_compile_definitions(default_dialect_C PRIVATE
DEFAULT_C11=$<EQUAL:${CMAKE_C_STANDARD_DEFAULT},11>
DEFAULT_C99=$<EQUAL:${CMAKE_C_STANDARD_DEFAULT},99>
DEFAULT_C90=$<EQUAL:${CMAKE_C_STANDARD_DEFAULT},90>
)
endif()
endif()
if (CMAKE_CXX_COMPILE_FEATURES)
string(FIND "${CMAKE_CXX_FLAGS}" "-std=" std_flag_idx)
if (std_flag_idx EQUAL -1)
add_executable(default_dialect default_dialect.cpp)
target_compile_definitions(default_dialect PRIVATE
DEFAULT_CXX14=$<EQUAL:${CMAKE_CXX_STANDARD_DEFAULT},14>
DEFAULT_CXX11=$<EQUAL:${CMAKE_CXX_STANDARD_DEFAULT},11>
DEFAULT_CXX98=$<EQUAL:${CMAKE_CXX_STANDARD_DEFAULT},98>
)
endif()
add_executable(CompileFeatures main.cpp)
set_property(TARGET CompileFeatures
PROPERTY COMPILE_FEATURES "cxx_auto_type"
)
set_property(TARGET CompileFeatures
PROPERTY CXX_STANDARD_REQUIRED TRUE
)
add_executable(GenexCompileFeatures main.cpp)
set_property(TARGET GenexCompileFeatures
PROPERTY COMPILE_FEATURES "$<1:cxx_auto_type>;$<0:not_a_feature>"
)
add_library(iface INTERFACE)
set_property(TARGET iface
PROPERTY INTERFACE_COMPILE_FEATURES "cxx_auto_type"
)
add_executable(IfaceCompileFeatures main.cpp)
target_link_libraries(IfaceCompileFeatures iface)
add_definitions(-DEXPECT_OVERRIDE_CONTROL=1)
add_executable(CompileFeaturesGenex genex_test.cpp)
set_property(TARGET CompileFeaturesGenex PROPERTY CXX_STANDARD 11)
target_compile_definitions(CompileFeaturesGenex PRIVATE HAVE_OVERRIDE_CONTROL=$<COMPILE_FEATURES:cxx_final,cxx_override>)
add_executable(CompileFeaturesGenex2 genex_test.cpp)
target_compile_features(CompileFeaturesGenex2 PRIVATE cxx_static_assert)
target_compile_definitions(CompileFeaturesGenex2 PRIVATE HAVE_OVERRIDE_CONTROL=$<COMPILE_FEATURES:cxx_final,cxx_override>)
add_library(static_assert_iface INTERFACE)
target_compile_features(static_assert_iface INTERFACE cxx_static_assert)
add_executable(CompileFeaturesGenex3 genex_test.cpp)
target_link_libraries(CompileFeaturesGenex3 PRIVATE static_assert_iface)
target_compile_definitions(CompileFeaturesGenex3 PRIVATE HAVE_OVERRIDE_CONTROL=$<COMPILE_FEATURES:cxx_final,cxx_override>)
endif()
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