[all-commits] [llvm/llvm-project] ca8a6b: [Clang] fix crash when constexpr evaluation encoun...

[Oleksandr Tarasiuk via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ca8a6b8cb14e7006b041da889ba16110ec2cd673
      https://github.com/llvm/llvm-project/commit/ca8a6b8cb14e7006b041da889ba16110ec2cd673
  Author: Oleksandr Tarasiuk <oleksandr.tarasiuk at outlook.com>
  Date:   2026-02-13 (Fri, 13 Feb 2026)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/AST/ExprConstant.cpp
    M clang/test/SemaCXX/constexpr-vectors-access-elements.cpp

  Log Message:
  -----------
  [Clang] fix crash when constexpr evaluation encounters uninitialized GCC vector (#180293)

Fixes #180044

---

This patch addresses the regression caused by
https://github.com/llvm/llvm-project/commit/77534291fcbd2c784c54e39a60895e4f60f19742.
The crash happens because


https://github.com/llvm/llvm-project/blob/85d94e17144f2ca250c91b827b59e6ddea675d31/clang/lib/AST/ExprConstant.cpp#L4294

tries to read a vector element when the `APValue` is still
`Indeterminate` or `Absent`. These changes _populate_ vector `APValue`
to ensure elements exist before access.



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