[all-commits] [llvm/llvm-project] 27ab13: [clang][ASTImporter] Import TemplateName correctly

[Balázs Kéri via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 27ab138c69fc61b22ef898a0f4d0f5c9bad649bd
      https://github.com/llvm/llvm-project/commit/27ab138c69fc61b22ef898a0f4d0f5c9bad649bd
  Author: Balázs Kéri <1.int32 at gmail.com>
  Date:   2023-03-03 (Fri, 03 Mar 2023)

  Changed paths:
    M clang/lib/AST/ASTImporter.cpp
    M clang/unittests/AST/ASTImporterTest.cpp

  Log Message:
  -----------
  [clang][ASTImporter] Import TemplateName correctly

This is a fix for a problem when multiple template
specializations are created by ASTImporter for the
same specialization. The problem happens if a
TemplateName is imported that points to a template
delcaration (for a template template argument)
(specialization) that has multiple instances in the
declaration chain. If two TemplateName objects contain
different pointers to a template specialization,
these TemplateName objects will have different checksum
even if they point into the same declaration chain.
The problem is fixed if the canonical declaration is used.

Reviewed By: vabridgers, donat.nagy

Differential Revision: https://reviews.llvm.org/D144622