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enable_language (CXX)
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include(CheckCompilerFlag)
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set(CXX 1) # test that this is tolerated
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# test that the check uses an isolated locale
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set(_env_LC_ALL "${LC_ALL}")
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set(ENV{LC_ALL} "BAD")
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check_compiler_flag(CXX "-_this_is_not_a_flag_" SHOULD_FAIL)
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if(SHOULD_FAIL)
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message(SEND_ERROR "invalid CXX compile flag didn't fail.")
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endif()
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if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|LCC|Clang" AND NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
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check_compiler_flag(CXX "-x c++" SHOULD_WORK)
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if(NOT SHOULD_WORK)
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message(SEND_ERROR "${CMAKE_CXX_COMPILER_ID} compiler flag '-x c++' check failed")
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endif()
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block()
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# Test tolerating a flag that is not used when driving the linker.
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string(APPEND CMAKE_CXX_FLAGS " -nostdinc++")
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check_compiler_flag(CXX "-x c++" SHOULD_WORK_NOSTDINCXX)
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if(NOT SHOULD_WORK_NOSTDINCXX)
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message(SEND_ERROR "${CMAKE_CXX_COMPILER_ID} compiler flag '-x c++ -nostdinc++' check failed")
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endif()
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endblock()
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endif()
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if(NOT "$ENV{LC_ALL}" STREQUAL "BAD")
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message(SEND_ERROR "ENV{LC_ALL} was not preserved by check_compiler_flag")
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endif()
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set(ENV{LC_ALL} ${_env_LC_ALL})
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