[CMake] check_cxx_compiler_flag usage

[Clément Gregoire]

That's probably an issue with linking because it doesn't know it has to
link asan.
Either way, settings asan flags is the job of the user, not the
cmakelists.txt.
Such things should be kept in tool chain or config files IMHO.
You can try running cmake in verbose mode for more information.

Le jeu. 7 déc. 2017 à 09:25, Damien R <damienrg+list at gmail.com> a écrit :

> Hi,
>
> I am trying to use CHECK_CXX_COMPILER_FLAG with cmake 3.9 to check if the
> compiler supports asan.
> The CMakeLists.txt is:
> cmake_minimum_required(VERSION 3.9)
> include(CheckCXXCompilerFlag)
> check_cxx_compiler_flag("-fsanitize=address" COMPILER_SUPPORT_FLAG)
>
> I always got:
> -- Performing Test COMPILER_SUPPORT_FLAG - Failed
>
> Even if the documentation say that CHECK_CXX_COMPILER_FLAG sets
> CMAKE_REQUIRED_DEFINITIONS by the name of the macro I thought that it would
> work.
> Can you tell me why CHECK_CXX_COMPILER_FLAG use
> CMAKE_REQUIRED_DEFINITIONS instead of CMAKE_REQUIRED_FLAGS
> and what is the official way for checking this flag?
>
> Regards,
>
> Damien R.
>
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