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enable_language (C)
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include(CheckCompilerFlag)
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set(C 1) # test that this is tolerated
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check_compiler_flag(C "-_this_is_not_a_flag_" SHOULD_FAIL)
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if(SHOULD_FAIL)
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message(SEND_ERROR "invalid C compile flag didn't fail.")
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endif()
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if(CMAKE_C_COMPILER_ID MATCHES "GNU|LCC|Clang" AND NOT "x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC")
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check_compiler_flag(C "-x c" SHOULD_WORK)
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if(NOT SHOULD_WORK)
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message(SEND_ERROR "${CMAKE_C_COMPILER_ID} compiler flag '-x c' check failed")
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endif()
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endif()
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if(CMAKE_C_COMPILER_ID STREQUAL "GNU") # LCC C compiler silently ignore -frtti instead of failing, so skip it here.
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check_compiler_flag(C "-frtti" SHOULD_FAIL_RTTI)
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if(SHOULD_FAIL_RTTI)
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message(SEND_ERROR "${CMAKE_C_COMPILER_ID} compiler flag '-frtti' check passed but should have failed")
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endif()
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endif()
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