Re: Apple LLVM 10 and `__fallthrough__`
-# elif (__GNUC__ >= 7) || (__clang_major__ >= 10) +# elif ((__GNUC__ >= 7) \ +|| (defined __apple_build_version__ \ +? __apple_build_version__ >= 1400 \ +: __clang_major__ >= 10)) Wiki suggests __apple_build_version__ >= 1200 https://en.wikipedia.org/wiki/Xcode#Xcode_11.0_-_14.x_(since_SwiftUI_framework)_2 Would it perhaps be better if clang used [[fallthrough]] instead of __attribute__((fallthrough))? They have supported [[fallthrough]] since at least 3.5.0 circa 2014. In this particular case they are ahead of GCC and towards the standard acceptance. https://releases.llvm.org/3.5.0/tools/clang/docs/AttributeReference.html There was also a suggestion on this list to use __has_attribute. https://lists.gnu.org/archive/html/bug-gnulib/2021-01/msg00267.html
Re: Apple LLVM 10 and `__fallthrough__`
On Sun, Feb 26, 2023 at 7:08 PM Bruno Haible wrote: > > Alexei Podtelezhnikov wrote: > > -# elif (__GNUC__ >= 7) || (__clang_major__ >= 10) > > +# elif ((__GNUC__ >= 7) \ > > +|| (defined __apple_build_version__ \ > > +? __apple_build_version__ >= 1400 \ > > +: __clang_major__ >= 10)) > > > > Wiki suggests __apple_build_version__ >= 1200 > > https://en.wikipedia.org/wiki/Xcode#Xcode_11.0_-_14.x_(since_SwiftUI_framework)_2 > > Interesting. Can you test it (by compiling Werner's test program from > <https://lists.gnu.org/archive/html/bug-gnulib/2023-02/msg00159.html> > on an Xcode version between 12.0 and 12.4)? I wish I could directly test it. However, I could confirm that Swift release 5.3 (Xcode 12) was the first release with this line https://github.com/apple/llvm-project/blob/swift-5.3-RELEASE/clang/test/Sema/fallthrough-attr.c#L18
Re: Apple LLVM 10 and `__fallthrough__`
> > > -# elif (__GNUC__ >= 7) || (__clang_major__ >= 10) > > > +# elif ((__GNUC__ >= 7) \ > > > +|| (defined __apple_build_version__ \ > > > +? __apple_build_version__ >= 1400 \ > > > +: __clang_major__ >= 10)) > > > > > > Wiki suggests __apple_build_version__ >= 1200 > > > https://en.wikipedia.org/wiki/Xcode#Xcode_11.0_-_14.x_(since_SwiftUI_framework)_2 Alternative Xcode versioning source found: https://github.com/gsl-lite/gsl-lite/blob/master/include/gsl/gsl-lite.hpp#L534-L557