[CMake] check_cxx_compiler_flag usage

[Eric Noulard]

Not really answering the question but
did you try to use an existing CMake module for handling sanitizers config?

I find this one https://github.com/arsenm/sanitizers-cmake very effective,
with
modern CMake target oriented features.




2017-12-07 9:24 GMT+01:00 Damien R <damienrg+list at gmail.com>:

> 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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-- 
Eric
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