[CMake] check_cxx_compiler_flag usage

[Damien R]

Thank you for pointing that. It increments the number of people using
CMAKE_REQUIRED_FLAGS "trick" to make it working with
check_cxx_compiler_flag.

But my question is more about :
 - why they coded CHECK_CXX_COMPILER_FLAG this way?
 - is my usage valid or not? If not what should I do? If yes, is it a bug?

Regards,

Damien R.



On 7 December 2017 at 10:35, Eric Noulard <eric.noulard at gmail.com> wrote:

>
> 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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