[CMake] cpp macro

[Stéphane Ancelot]

Le 04/06/2018 à 10:16, Eric Noulard a écrit :
>
>
> Le lun. 4 juin 2018 à 09:59, Stéphane Ancelot 
> <sancelot at numalliance.com <mailto:sancelot at numalliance.com>> a écrit :
>
>     hi
>
>     is there a mactro for cpp ?
>
>
> You mean a CMake variable which would contain the path to C 
> preprocessor binary?
>
> I don't think so, at list no xxx_<LANG>_xxx variable seems to exists 
> for that.
> Did you check "cmake --help-variable-list" ?
>
> May be you can ask the compiler to act a the C pre-processor?
>
> clang and gcc both accept the '-E' command line option to only run the 
> preprocessor.
>
I used ${CMAKE_C_COMPILER} -E
> otherwise you may probably call
>
> find_program(C_PREPROCESSOR NAMES cpp)
>
> In both cases I don't know how to discover that in a cross-platform way.
> Probably MSVC has another option for pre-processsing.
>
> Eric
>
>
>     Regards,
>
>     S.Ancelot
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> Eric

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