ref: 1639592368fc2dadc82d63f3be6f17ed0b554d71
dir: /cmake/CFeatureCheck.cmake/
# - Compile and run code to check for C features # # This functions compiles a source file under the `cmake` folder # and adds the corresponding `HAVE_[FILENAME]` flag to the CMake # environment # # c_feature_check(<FLAG> [<VARIANT>]) # # - Example # # include(CFeatureCheck) # c_feature_check(VLA) if(__c_feature_check) return() endif() set(__c_feature_check INCLUDED) function(c_feature_check FILE) string(TOLOWER ${FILE} FILE) string(TOUPPER ${FILE} VAR) string(TOUPPER "${VAR}_SUPPORTED" FEATURE) if (DEFINED ${VAR}_SUPPORTED) set(${VAR}_SUPPORTED 1 PARENT_SCOPE) return() endif() if (NOT DEFINED COMPILE_${FEATURE}) message(STATUS "Performing Test ${FEATURE}") try_compile(COMPILE_${FEATURE} ${PROJECT_BINARY_DIR} ${PROJECT_SOURCE_DIR}/cmake/${FILE}.c) endif() if(COMPILE_${FEATURE}) message(STATUS "Performing Test ${FEATURE} -- success") set(${VAR}_SUPPORTED 1 PARENT_SCOPE) else() message(STATUS "Performing Test ${FEATURE} -- failed to compile") endif() endfunction()