cmake COMPILER_HAS_CXX_FLAG examples

boostorg/hof CMakeLists.txt :67 

check_cxx_compiler_flag("${flag}" COMPILER_HAS_CXX_FLAG${flag_var})

Jackarain/proxy third_party/boost/libs/hof/CMakeLists.txt :67 

check_cxx_compiler_flag("${flag}" COMPILER_HAS_CXX_FLAG${flag_var})