h-vetinari added a comment. In D133853#3797598 <https://reviews.llvm.org/D133853#3797598>, @RIscRIpt wrote:
> I am afraid it would take me some effort to implement semantics of > `[[msvc::no_unique_address]]`, so I'd like to focus only on > `[[msvc::constexpr]]` in current patch. Just for context, `[[msvc::no_unique_address]]` is 100% <https://devblogs.microsoft.com/cppblog/msvc-cpp20-and-the-std-cpp20-switch/#c20-no_unique_address> like the standardized `[[no_unique_address]]`, but MSFT was... exceedingly cautious... about introducing this, as - even for an explicitly opt-in new feature - someone might have compiled code containing `[[no_unique_address]]` at a time when it was a no-op in their compiler (as an unknown attribute), and changing the semantics after the fact would have violated their very strict compatibility guarantees. I assume the reasoning behind `[[msvc::constexpr]]` to be along the same lines. Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D133853/new/ https://reviews.llvm.org/D133853 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
