| # - 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 |
| # |
| # add_cxx_compiler_FLAG(<FLAG> [<VARIANT>]) |
| # |
| # - Example |
| # |
| # include(AddCXXCompilerFlag) |
| # add_cxx_compiler_FLAG(-Wall) |
| # add_cxx_compiler_FLAG(-no-strict-aliasing RELEASE) |
| # Requires CMake 2.6+ |
| |
| if(__cxx_feature_check_FLAG) |
| return() |
| endif() |
| set(__cxx_feature_check_FLAG INCLUDED) |
| |
| function(cxx_feature_check FILE) |
| string(TOLOWER ${FILE} FILE) |
| string(TOUPPER ${FILE} VAR) |
| string(TOUPPER "HAVE_${VAR}" FEATURE) |
| message("-- Performing Test ${FEATURE}") |
| try_run(RUN_${FEATURE} COMPILE_${FEATURE} ${CMAKE_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/cmake/${FILE}.cpp) |
| if(RUN_${FEATURE} EQUAL 0) |
| message("-- Performing Test ${FEATURE} -- Success") |
| set(HAVE_${VAR} 1 PARENT_SCOPE) |
| add_definitions(-DHAVE_${VAR}) |
| else() |
| message("-- Performing Test ${FEATURE} -- Failed") |
| endif() |
| endfunction() |
| |
