[all-commits] [llvm/llvm-project] c1468e: [Clang] Don't give up on an unsuccessful function ...

[Younan Zhang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c1468e9cbca1002a24772af1a0e7a771f93f6910
      https://github.com/llvm/llvm-project/commit/c1468e9cbca1002a24772af1a0e7a771f93f6910
  Author: Younan Zhang <zyn7109 at gmail.com>
  Date:   2025-03-05 (Wed, 05 Mar 2025)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/Sema/Sema.h
    M clang/lib/Interpreter/IncrementalParser.cpp
    M clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
    M clang/test/CodeGenCXX/function-template-specialization.cpp

  Log Message:
  -----------
  [Clang] Don't give up on an unsuccessful function instantiation (#126723)

For constexpr function templates, we immediately instantiate them upon
reference. However, if the function isn't defined at the time of
instantiation, even though it might be defined later, the instantiation
would forever fail.

This patch corrects the behavior by popping up failed instantiations
through PendingInstantiations, so that we are able to instantiate them
again in the future (e.g. at the end of TU.)

Fixes https://github.com/llvm/llvm-project/issues/125747



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