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include(${CMAKE_CURRENT_LIST_DIR}/cm_message_checks_compat.cmake)
function(cm_check_cxx_feature name)
set(TRY_RUN_FEATURE "${ARGN}")
string(TOUPPER ${name} FEATURE)
if(NOT DEFINED CMake_HAVE_CXX_${FEATURE})
cm_message_checks_compat(
"Checking if compiler supports C++ ${name}"
__checkStart __checkPass __checkFail)
message(${__checkStart})
if(CMAKE_CXX_STANDARD)
set(maybe_cxx_standard -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD})
else()
set(maybe_cxx_standard "")
endif()
if (TRY_RUN_FEATURE)
try_run(CMake_RUN_CXX_${FEATURE} CMake_COMPILE_CXX_${FEATURE}
${CMAKE_CURRENT_BINARY_DIR}
${CMAKE_CURRENT_LIST_DIR}/cm_cxx_${name}.cxx
CMAKE_FLAGS ${maybe_cxx_standard}
OUTPUT_VARIABLE OUTPUT
)
if (CMake_RUN_CXX_${FEATURE} EQUAL "0" AND CMake_COMPILE_CXX_${FEATURE})
set(CMake_HAVE_CXX_${FEATURE} ON CACHE INTERNAL "TRY_RUN" FORCE)
else()
set(CMake_HAVE_CXX_${FEATURE} OFF CACHE INTERNAL "TRY_RUN" FORCE)
endif()
else()
try_compile(CMake_HAVE_CXX_${FEATURE}
${CMAKE_CURRENT_BINARY_DIR}
${CMAKE_CURRENT_LIST_DIR}/cm_cxx_${name}.cxx
CMAKE_FLAGS ${maybe_cxx_standard}
OUTPUT_VARIABLE OUTPUT
)
endif()
set(check_output "${OUTPUT}")
# Filter out MSBuild output that looks like a warning.
string(REGEX REPLACE " +0 Warning\\(s\\)" "" check_output "${check_output}")
# Filter out MSBuild output that looks like a warning.
string(REGEX REPLACE "[^\n]*warning MSB[0-9][0-9][0-9][0-9][^\n]*" "" check_output "${check_output}")
# Filter out warnings caused by user flags.
string(REGEX REPLACE "[^\n]*warning:[^\n]*-Winvalid-command-line-argument[^\n]*" "" check_output "${check_output}")
# Filter out warnings caused by local configuration.
string(REGEX REPLACE "[^\n]*warning:[^\n]*directory not found for option[^\n]*" "" check_output "${check_output}")
string(REGEX REPLACE "[^\n]*warning:[^\n]*object file compiled with -mlong-branch which is no longer needed[^\n]*" "" check_output "${check_output}")
# Filter out other warnings unrelated to feature checks.
string(REGEX REPLACE "[^\n]*warning:[^\n]*sprintf\\(\\) is often misused, please use snprintf[^\n]*" "" check_output "${check_output}")
# Filter out libhugetlbfs warnings.
string(REGEX REPLACE "[^\n]*libhugetlbfs [^\n]*: WARNING[^\n]*" "" check_output "${check_output}")
# Filter out xcodebuild warnings.
string(REGEX REPLACE "[^\n]* xcodebuild\\[[0-9]*:[0-9]*\\] warning: [^\n]*" "" check_output "${check_output}")
# Filter out icpc warnings
string(REGEX REPLACE "[^\n]*icpc: command line warning #10121: overriding [^\n]*" "" check_output "${check_output}")
# Filter out ld warnings.
string(REGEX REPLACE "[^\n]*ld: warning: [^\n]*" "" check_output "${check_output}")
# If using the feature causes warnings, treat it as broken/unavailable.
if(check_output MATCHES "(^|[ :])[Ww][Aa][Rr][Nn][Ii][Nn][Gg]")
set(CMake_HAVE_CXX_${FEATURE} OFF CACHE INTERNAL "TRY_COMPILE" FORCE)
endif()
if(CMake_HAVE_CXX_${FEATURE})
message(${__checkPass} "yes")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Determining if compiler supports C++ ${name} passed with the following output:\n"
"${OUTPUT}\n"
"\n"
)
else()
message(${__checkFail} "no")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining if compiler supports C++ ${name} failed with the following output:\n"
"${OUTPUT}\n"
"\n"
)
endif()
endif()
endfunction()
cm_check_cxx_feature(make_unique)
if(CMake_HAVE_CXX_MAKE_UNIQUE)
set(CMake_HAVE_CXX_UNIQUE_PTR 1)
endif()
cm_check_cxx_feature(unique_ptr)
if (NOT CMAKE_CXX_STANDARD LESS "17"
AND NOT MSYS # FIXME: RunCMake.cmake_path cases crash with MSYS std::filesystem
)
if (NOT CMAKE_CROSSCOMPILING OR CMAKE_CROSSCOMPILING_EMULATOR)
cm_check_cxx_feature(filesystem TRY_RUN)
else()
# In cross-compiling mode, it is not possible to check implementation bugs
# so rely only on conformance done by compilation
cm_check_cxx_feature(filesystem)
endif()
else()
set(CMake_HAVE_CXX_FILESYSTEM FALSE)
endif()
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