1 files changed, 13 insertions, 0 deletions
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index 0444f9f..8b65348 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -485,6 +485,14 @@ private:
   typedef std::pair<OrderGlobalInitsOrStermFinalizers, llvm::Function *>
       GlobalInitData;
 
+  // When a tail call is performed on an "undefined" symbol, on PPC without pc
+  // relative feature, the tail call is not allowed. In "EmitCall" for such
+  // tail calls, the "undefined" symbols may be forward declarations, their
+  // definitions are provided in the module after the callsites. For such tail
+  // calls, diagnose message should not be emitted.
+  llvm::SmallSetVector<std::pair<const FunctionDecl *, SourceLocation>, 4>
+      MustTailCallUndefinedGlobals;
+
   struct GlobalInitPriorityCmp {
     bool operator()(const GlobalInitData &LHS,
                     const GlobalInitData &RHS) const {
@@ -1647,6 +1655,11 @@ public:
     return getTriple().isSPIRVLogical();
   }
 
+  void addUndefinedGlobalForTailCall(
+      std::pair<const FunctionDecl *, SourceLocation> Global) {
+    MustTailCallUndefinedGlobals.insert(Global);
+  }
+
 private:
   bool shouldDropDLLAttribute(const Decl *D, const llvm::GlobalValue *GV) const;