> It will take some investigation to decide how/whether to set SIMULATE_ID
> to GNU.
This seems like the right thing to do, and is more future proof than the
alternative.
On Wed, Aug 3, 2016 at 5:56 AM, Brad King <brad.k...@kitware.com> wrote:
> 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
>
>
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