================
@@ -704,6 +704,15 @@ ItaniumMangleContextImpl::getEffectiveDeclContext(const
Decl *D) {
return D->getLexicalDeclContext()->getRedeclContext();
}
+ if (const auto *FTD = dyn_cast<FunctionTemplateDecl>(D)) {
+ // Member-like constrained friends are mangled as if they were members of
+ // the enclosing class.
+ if (FTD->getTemplatedDecl()->isMemberLikeConstrainedFriend() &&
+ getASTContext().getLangOpts().getClangABICompat() >
+ LangOptions::ClangABI::Ver19)
+ return D->getLexicalDeclContext()->getRedeclContext();
----------------
usx95 wrote:
This looks quite a tech debt. I am not aware of our policy regarding the past
ABIs we should be supporting, but there definitely should be a time limit.
We should add a fixme to remove ABI checks after supported time
```
FIXME: Remove check for Ver17 and use D->getAsFunction() after clang-X
FIXME: Remove check for Ver19 after clang-Y
```
@zygoloid Are you aware of a reasonable clang version (X and Y here) after
which we should stop supporting Ver17 ? I can guess maybe 1-3 years ?
https://github.com/llvm/llvm-project/pull/110503
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