| # - 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() |
