[cmake-developers] _check_cxx_compiler_attribute macro from GenerateExportHeader.cmake

[Stephen Kelly]

Rolf Eike Beer wrote:

> This macro does this:
> 
> macro(_check_cxx_compiler_attribute _ATTRIBUTE _RESULT)
>   check_cxx_source_compiles("${_ATTRIBUTE} int somefunc() { return 0; }
>     int main() { return somefunc();}" ${_RESULT}
>     # Some compilers do not fail with a bad flag
>     FAIL_REGEX "unrecognized .*option"                     # GNU
>     FAIL_REGEX "ignoring unknown option"                   # MSVC
>     FAIL_REGEX "warning D9002"                             # MSVC, any
>     lang
>     FAIL_REGEX "[Uu]nknown option"                         # HP
>     FAIL_REGEX "[Ww]arning: [Oo]ption"                     # SunPro
>     FAIL_REGEX "command option .* is not recognized"       # XL
>   )
> endmacro()
> 
> The FAIL_REGEX were copied from CheckCXXCompilerFlag and are to match
> errors about broken command line arguments. I doubt they make any sense at
> this point. Is this intentional or by accident?

When you say 'not make any sense' what do you mean? 

Thanks,

Steve.