CMake: document -Werror for add_c_flag_if_supported() from #7718
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@ -106,6 +106,8 @@ function (die msg)
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endfunction ()
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function (add_c_flag_if_supported flag var)
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# Prepending the flag with -Werror will only add the flag,
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# if it doesn't result in generation of a warning of using a flag unknown to the compiler.
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set(TMP "-Werror ${flag}")
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string(REGEX REPLACE "[- ]" "_" supported ${TMP}_c)
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check_c_compiler_flag(${TMP} ${supported})
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