rsmith added a comment. In https://reviews.llvm.org/D23719#520954, @bcraig wrote:
> In https://reviews.llvm.org/D23719#520952, @rsmith wrote: > > > Are we really guaranteed that the C and C++ compiler behave the same way > > here? I don't see why that would necessarily be the case. > > > For libc++, std::atomic is implemented in terms of _Atomic. So as long as > the C++ compiler doesn't butcher _Atomic, it seems that the behavior would be > the same. I don't see any good reason to assume that's the case. GCC, for instance, does not define _Atomic *at all* in C++ mode; the implementation used by libc++ in that case is completely different. Also, as far as I know, libc++ did not previously require the host to have a C11 compiler. And there's no reason to assume that the C compiler picked up by cmake is in any way related to the C++ compiler. Bottom line: if you want to know how the C++ compiler behaves, you need to test the C++ compiler not the C compiler. https://reviews.llvm.org/D23719 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
