Re: Clang, MSYS2 and MSVC

[Paul Eggert]

On 2023-10-15 17:01, Jeffrey Walton wrote:

> A quick heads up... We caught a bug report because Clang got into a
> code path intended for MSVC.
Thanks for the heads-up.

Was this in Gnulib, or in some other code? If in Gnulib, where?


> Like with the Apple issue, detect it like so:
>
>      #if defined(__clang__) && defined(__apple_build_version__)
>      # define APPLE_CLANG_VERSION (__clang_major__ * 10000 +
> __clang_minor__ * 100 + __clang_patchlevel__)
>      #elif defined(__clang__) && defined(_MSC_VER)
>      # define MSVC_CLANG_VERSION (__clang_major__ * 10000 +
> __clang_minor__ * 100 + __clang_patchlevel__)
>      #elif defined(__clang__)
>      # define LLVM_CLANG_VERSION  (__clang_major__ * 10000 +
> __clang_minor__ * 100 + __clang_patchlevel__)
>      #endif
The problem we observed with Apple's Clang is that __clang_major__, 
__clang_minor__, and __clang_patchlevel__ didn't match standard Clang. 
Sometimes Apple Clang had a feature that wasn't indicated by those 
macros in standard Clang (or vice versa, I forget which).
Does Microsoft Clang have a similar problem? Can you give an example, or 
point to documentation for it?