On 08/02/2016 06:59 PM, Chaoren Lin wrote:
>> In the gcc-like variant the CMAKE_{C,CXX}_SIMULATE_ID
>> should be detected as GNU and cause the existing code to work.
>
> Huh, it doesn't look like that variable is set automatically when using
> clang with the gcc toolchain. Is that supposed to happen?
> It should be set manually (say, in a toolchain file)?
It is supposed to be detected automatically. Whenever Clang is detected
on Windows the _SIMULATE_ID should be detected too. I found the problem.
The simulate id detection is done here:
https://gitlab.kitware.com/cmake/cmake/blob/v3.6.1/Modules/Compiler/Clang-DetermineCompilerInternal.cmake#L12-15
and it only looks for MSVC. Grepping for SIMULATE_ID reveals that it is
used for Intel and Clang but only ever detects when MSVC is simulated.
All consuming code paths are interested in whether SIMULATE_ID==MSVC
and otherwise assume GNU, except cmGlobalNinjaGenerator::EnableLanguage.
It will take some investigation to decide how/whether to set SIMULATE_ID
to GNU. Alternatively the corresponding test in the Ninja generator could
be changed to look for `COMPILER_ID == Clang && SIMULATE_ID != MSVC`.
-Brad
--
Powered by www.kitware.com
Please keep messages on-topic and check the CMake FAQ at:
http://www.cmake.org/Wiki/CMake_FAQ
Kitware offers various services to support the CMake community. For more
information on each offering, please visit:
CMake Support: http://cmake.org/cmake/help/support.html
CMake Consulting: http://cmake.org/cmake/help/consulting.html
CMake Training Courses: http://cmake.org/cmake/help/training.html
Visit other Kitware open-source projects at
http://www.kitware.com/opensource/opensource.html
Follow this link to subscribe/unsubscribe:
http://public.kitware.com/mailman/listinfo/cmake-developers
