[all-commits] [llvm/llvm-project] c0f86c: Reland: [clang] Track function template instantiat...

[Matheus Izvekov via All-commits]

  Branch: refs/heads/users/mizvekov/clang-fix-GH55509-20.x
  Home:   https://github.com/llvm/llvm-project
  Commit: c0f86c988617ab5104d5a95fbcac38fd0a8ee4d7
      https://github.com/llvm/llvm-project/commit/c0f86c988617ab5104d5a95fbcac38fd0a8ee4d7
  Author: Matheus Izvekov <mizvekov at gmail.com>
  Date:   2025-02-19 (Wed, 19 Feb 2025)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/AST/Decl.h
    M clang/include/clang/AST/DeclBase.h
    M clang/include/clang/AST/DeclTemplate.h
    M clang/lib/AST/Decl.cpp
    M clang/lib/Sema/SemaTemplateDeduction.cpp
    M clang/lib/Sema/SemaTemplateInstantiate.cpp
    M clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
    M clang/lib/Serialization/ASTReaderDecl.cpp
    M clang/lib/Serialization/ASTWriterDecl.cpp
    A clang/test/SemaTemplate/GH55509.cpp

  Log Message:
  -----------
  Reland: [clang] Track function template instantiation from definition (#125266)

This fixes instantiation of definition for friend function templates,
when the declaration found and the one containing the definition
have different template contexts.

In these cases, the the function declaration corresponding to the
definition is not available; it may not even be instantiated at all.

So this patch adds a bit which tracks which function template
declaration was instantiated from the member template.
It's used to find which primary template serves as a context
for the purpose of obtainining the template arguments needed
to instantiate the definition.

Fixes #55509



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