[PATCH] D21767: Fix instantiation of friend function templates

[Serge Pavlov via Phabricator via cfe-commits]

sepavloff added a comment.

In https://reviews.llvm.org/D21767#1197783, @rjmccall wrote:

> Shouldn't there just be a link in the AST from the instantiated `FunctionTemplateDecl ` back to the original pattern?  Maybe a generalization of `InstantiatedFromMember` in `RedeclarablableTemplateDecl`?


The field `InstantiatedFromMember` indeed helps finding function template definition, this patch only modifies search algorithm to make it suitable for friend templates. Friend function templates have dual nature, they may be members of redeclaration chains, like usual namespace level function templates and still use `InstantiatedFromMember` like member function templates. So the resulting search algorithm (implemented in `getPatternFor`) scans both redeclaration chain and the chain formed by `InstantiatedFromMember`.


Repository:
  rC Clang

https://reviews.llvm.org/D21767