Hello, as discussed here in more detail: https://reviews.llvm.org/D81583 the introduction of the C++20 [[no_unique_address]] attribute exposes an ABI issue on platforms that require special handling for structs/classes that are "equivalent" to a single floating-point member (or in some cases, a "homogeneous" set of floating-point members). This is because we can now for the first time have "empty" members in a C++ class, which affects that determination. The Itanium C++ ABI document was updated to include these new cases, and GCC 10 was changed accordingly. However, current clang/LLVM mainline does not comply with this new ABI. The Phabricator review I posted above fixes that for the SystemZ target, but because I'm touching some amount of common code, and because -to the best of my understanding- other platforms would actually likewise be affected, I'm asking for comments here as well. Given that we're nearing the time frame to create the LLVM 11 branch, it would really be good if this issue could be fixed before the branch. Bye, Ulrich -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20200707/c1a2f6b9/attachment.html>
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