tree 38096445aedcb216b0593a8312bcb5dfe89bfb81
parent 468dfaafe613415ed662f2abff9720f0fb1a1b8a
author kevin1108 <kevinlzh1108@gmail.com> 1778127015 +0800
committer GitHub <noreply@github.com> 1778127015 -0700
gpgsig -----BEGIN PGP SIGNATURE-----
 
 wsFcBAABCAAQBQJp/BCnCRC1aQ7uu5UhlAAAFVwQAH8yIY09mULib9S2RBIHg+TE
 Qp26CwS2ySuQ1fIK3PDM/YPSgDqU7vt2zGFvvAi7K01g7XEJXpt+utlqFitzDWqP
 9x5ElwM/EGLG+gu5qhRcQZwUkBBwqwBQmiekuR8TJRVR16jFId9kO6dNqcSSlE9z
 oG6PYR42vMnudC51pwVyHZX5AAOFN/5SZS57rqL6hjqxpAJVuWiB3ZgeKyJGvzbZ
 vxLdO5sdAJZ02kIxDwve97cCHj/nb6+zoy4tgOwUqdkUXAldeB26T1h7zkZ8XJf5
 khn9WK5e1DxFyrdCcyHvvyMYAkb2weoUdGRJZ0iSJ6PcNHrw4Md2PbkTnXIZtdAt
 DVYD6Usxarn94aebuEab3SsRW0zHuvzEbe4GciBBRfSpDxlcu6xjj7kn8qzY7qHt
 rZCpAD3sGKQr/0t+BHcslaNlkwL9SMHYMYJ1tYz+CMZiHME80V5Nuxh9rReJrr8l
 N+IQUd3ltZw8z66VAoXVAhHy/3y6YzRxf3XAOQs9tWLHVaSApp1Y8bUZMbefstsD
 1M+Io1JzNMl7v4+w3Bc0GrvNIK2hendYeCPpT3jcjCj2GLpUjjXQYg4GVzq82CO7
 Zs6CZ+86JUk8VAJkbXOt2IIfWsD0nTtDL+BIjevh9cjUBsNfyvqiFUNWAVO2QZez
 0iTvxmsmfI8ZecvkvTGI
 =+pNJ
 -----END PGP SIGNATURE-----
 

[Clang] Fix mergeInheritableAttributes() to propagate all AvailabilityAttrs (#181482)

`getAttr<AvailabilityAttr>()` only returns the first matching attribute,
but a declaration can carry multiple AvailabilityAttrs (one per
platform, e.g. macOS + iOS).  Use `specific_attrs<AvailabilityAttr>()`
to iterate over all of them so every platform's availability is
propagated during cross-module redeclaration merging.

This aligns the PCM merge path with how `mergeDeclAttributes` already
iterates via `specific_attrs<InheritableAttr>()` on the Sema side.

Extend clang/test/Modules/decl-attr-merge.mm with a multi-platform
case and an iOS triple RUN line that triggers the bug without the fix.

Fixes https://github.com/llvm/llvm-project/issues/181298