[all-commits] [llvm/llvm-project] 26baa0: [clang] Diagnose dangling references for parenthes...

[Haojian Wu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 26baa00908b2eb8b2925800af6bc64fbe53cac48
      https://github.com/llvm/llvm-project/commit/26baa00908b2eb8b2925800af6bc64fbe53cac48
  Author: Haojian Wu <hokein.wu at gmail.com>
  Date:   2024-11-29 (Fri, 29 Nov 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/Sema/CheckExprLifetime.cpp
    M clang/test/AST/ByteCode/records.cpp
    A clang/test/SemaCXX/cxx20-warn-dangling-paren-list-agg-init.cpp
    M clang/test/SemaCXX/paren-list-agg-init.cpp

  Log Message:
  -----------
  [clang] Diagnose dangling references for parenthesized aggregate initialization. (#117690)

Unlike brace initialization, the parenthesized aggregate initialization
in C++20 does not extend the lifetime of a temporary object bound to a
reference in an aggreate. This can lead to dangling references:

```
struct A { const int& r; };
 A a1(1); // well-formed, but results in a dangling reference.
 ``` 

With this patch, clang will diagnose this common dangling issues.

Fixes #101957



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