1 files changed, 15 insertions, 0 deletions
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index dc9dd03..44bc7fb 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1394,6 +1394,21 @@ void CodeGenModule::Release() {
   // that might affect the DLL storage class or the visibility, and
   // before anything that might act on these.
   setVisibilityFromDLLStorageClass(LangOpts, getModule());
+
+  // Check the tail call symbols are truly undefined.
+  if (getTriple().isPPC() && !MustTailCallUndefinedGlobals.empty()) {
+    for (auto &I : MustTailCallUndefinedGlobals) {
+      if (!I.first->isDefined())
+        getDiags().Report(I.second, diag::err_ppc_impossible_musttail) << 2;
+      else {
+        StringRef MangledName = getMangledName(GlobalDecl(I.first));
+        llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
+        if (!Entry || Entry->isWeakForLinker() ||
+            Entry->isDeclarationForLinker())
+          getDiags().Report(I.second, diag::err_ppc_impossible_musttail) << 2;
+      }
+    }
+  }
 }
 
 void CodeGenModule::EmitOpenCLMetadata() {