[CMake] Appending to CMAKE_CXX_FLAGS

[Marc CHEVRIER]

The best approach is to use properties (see
https://cmake.org/cmake/help/git-master/manual/cmake-properties.7.html).

At directory level and target level you can use property
'COMPILE_OPTIONS'.  These properties can be updated using, respectively
'add_compile_options' and 'target_compile_options'.

Be aware that variable 'CMAKE_CXX_FLAGS' is a string so to extend it you
have to use:
string(APPEND CMAKE_CXX_FLAGS "flag1 flag2")


Le mar. 11 sept. 2018 à 17:58, Michael Jackson <mike.jackson at bluequartz.net>
a écrit :

> What is the “modern” way to append to CMAKE_CXX_FLAGS? This is the logic
> that I would like:
>
>
>
> If (MSVC)
>
>                 Set(CMAKE_CXX_FLAGS ${ CMAKE_CXX_FLAGS} “/MP”)
>
> Endif()
>
>
>
> I have always heard that appending to the compile flags in this way is
> “bad”. What is the best practice for doing this?
>
>
>
> Thanks
>
> --
>
> Michael Jackson | Owner, President
>
>       BlueQuartz Software
>
> [e] mike.jackson at bluequartz.net
>
> [w] www.bluequartz.net
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