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enable_language (CXX)
include(CheckCompilerFlag)
set(CXX 1) # test that this is tolerated
check_compiler_flag(CXX "-_this_is_not_a_flag_" SHOULD_FAIL)
if(SHOULD_FAIL)
message(SEND_ERROR "invalid CXX compile flag didn't fail.")
endif()
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang" AND NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
check_compiler_flag(CXX "-x c++" SHOULD_WORK)
if(NOT SHOULD_WORK)
message(SEND_ERROR "${CMAKE_CXX_COMPILER_ID} compiler flag '-x c++' check failed")
endif()
endif()
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