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# - 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()
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