[all-commits] [llvm/llvm-project] e734f0: [clang] Prevent duplicated instantiation of enumer...

[André Brand via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e734f01bffb87d035d9037ade8d8ba1e96639c2b
      https://github.com/llvm/llvm-project/commit/e734f01bffb87d035d9037ade8d8ba1e96639c2b
  Author: André Brand <andre.brand at mailbox.org>
  Date:   2025-01-27 (Mon, 27 Jan 2025)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
    A clang/test/SemaCXX/member-enum-declarations.cpp

  Log Message:
  -----------
  [clang] Prevent duplicated instantiation of enumerators of unscoped member enumerations  (#124407)

This commit addresses a bug occurring when an unscoped member enumeration
of a class template is introduced with an opaque-enum-declaration and later
redeclared with an enum-specifier (per C++23 [class.mem] p6).
Previously, the enumerators, or EnumConstantDecl, of the enum-specifier
were instantiated at both declarations, leading to different issues:
* erroneous ambiguities when referencing the enumerators,
* duplicated diagnostics in the enumerator-list.

The issue is resolved by ensuring that enumerators are instantiated only
at the first instantiated declaration, analogous to nested classes.

Fixes #124405



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