[all-commits] [llvm/llvm-project] 0af2d4: [Clang] Warn if both of `dllexport`/`dllimport` an...

[Tomohiro Kashiwada via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0af2d43e06415ce1e8a5d49e864c3881048dd08b
      https://github.com/llvm/llvm-project/commit/0af2d43e06415ce1e8a5d49e864c3881048dd08b
  Author: Tomohiro Kashiwada <kikairoya at gmail.com>
  Date:   2026-03-04 (Wed, 04 Mar 2026)

  Changed paths:
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/lib/Sema/SemaDeclAttr.cpp
    A clang/test/SemaCXX/attr-exclude_from_explicit_instantiation.ignore-dllattr.cpp

  Log Message:
  -----------
  [Clang] Warn if both of `dllexport`/`dllimport` and `exclude_from_explicit_instantiation` are specified (#183515)

The attributes `exclude_from_explicit_instantiation` and
`dllexport`/`dllimport` serve opposite purposes.
Therefore, if an entity has both attributes, drop one with a warning,
depending on the context of the declaration.
In a template context, the `exclude_from_explicit_instantiation`
attribute takes precedence over the `dllexport` or `dllimport`
attribute. Conversely, the `dllexport` and `dllimport` attributes are
prioritized, in a non-template context.



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