[all-commits] [llvm/llvm-project] c6eb26: [Clang] Fix mergeInheritableAttributes() to propag...

[kevin1108 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c6eb268dd15fa8e13d7c3beb8887fec0bb14f5f0
      https://github.com/llvm/llvm-project/commit/c6eb268dd15fa8e13d7c3beb8887fec0bb14f5f0
  Author: kevin1108 <kevinlzh1108 at gmail.com>
  Date:   2026-05-06 (Wed, 06 May 2026)

  Changed paths:
    M clang/lib/Serialization/ASTReaderDecl.cpp
    M clang/test/Modules/decl-attr-merge.mm

  Log Message:
  -----------
  [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



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