[clang] [Clang][Sema] Disable checking invalid template id in initializer of primary variable template `std::format_kind` with libstdc++ (PR #139560)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Yanzuo Liu (zwuis)

<details>
<summary>Changes</summary>

Fixes #<!-- -->139067

---
Full diff: https://github.com/llvm/llvm-project/pull/139560.diff


1 Files Affected:

- (modified) clang/lib/Sema/SemaTemplate.cpp (+5) 


``````````diff
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 7940340064eda..19142d7c16abb 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -4383,6 +4383,11 @@ Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc,
     };
 
     if (VarDecl *Var = Template->getTemplatedDecl();
+        // Skipping std::format_kind in libstdc++ is a hack for
+        // GH139067 / https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120190
+        !(Var->getName() == "format_kind" &&
+          Var->getDeclContext()->isStdNamespace() &&
+          PP.isMacroDefined("__GLIBCXX__")) &&
         ParsingInitForAutoVars.count(Var) &&
         llvm::equal(
             CTAI.CanonicalConverted,

``````````

</details>


https://github.com/llvm/llvm-project/pull/139560