[all-commits] [llvm/llvm-project] 32aded: [DebugInfo] Ignore undefined constexpr constructor...

[Clayton Knittel via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 32adedc8fb569f911d10df88bcbee015249dba02
      https://github.com/llvm/llvm-project/commit/32adedc8fb569f911d10df88bcbee015249dba02
  Author: Clayton Knittel <cknit1999 at gmail.com>
  Date:   2026-09-24 (Thu, 24 Sep 2026)

  Changed paths:
    M clang/lib/CodeGen/CGDebugInfo.cpp
    M clang/test/DebugInfo/CXX/limited-ctor.cpp

  Log Message:
  -----------
  [DebugInfo] Ignore undefined constexpr constructors in constructor homing. (#221971)

This is a roll-forward of
https://github.com/llvm/llvm-project/pull/218165, which inadvertantly
caused missing debug info in
https://github.com/llvm/llvm-project/issues/221560 due to an existing
issue with standard-layout unions and layout-compatible aliasing (see
[[class.mem]](https://timsong-cpp.github.io/cppwp/n3337/class.mem#19)).

Constexpr constructors without a visible definition in the TU are not
callable in a constexpr context, which means it is not possible to
construct a type in constexpr without emitting debug info for the
constructor itself. Although undefined constexpr constructors are still
callable, they are normal out of line functions, requiring a definition
to link against.



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