Verifier: Forbid comdats on linker declarations.

Differential Revision: http://reviews.llvm.org/D10945

llvm-svn: 241414

llvm/lib/IR/Verifier.cpp

@@ -438,6 +438,9 @@ void Verifier::visitGlobalValue(const GlobalValue &GV) {
     Assert(GVar && GVar->getValueType()->isArrayTy(),
            "Only global arrays can have appending linkage!", GVar);
   }
+
+  if (GV.isDeclarationForLinker())
+    Assert(!GV.hasComdat(), "Declaration may not be in a Comdat!", &GV);
 }
 
 void Verifier::visitGlobalVariable(const GlobalVariable &GV) {

llvm/test/Verifier/comdat-decl1.ll

@@ -0,0 +1,5 @@
+; RUN: not llvm-as %s -o /dev/null 2>&1 | FileCheck %s
+
+$v = comdat any
+@v = available_externally global i32 0, comdat
+; CHECK: Declaration may not be in a Comdat!

llvm/test/Verifier/comdat-decl2.ll

@@ -0,0 +1,5 @@
+; RUN: not llvm-as %s -o /dev/null 2>&1 | FileCheck %s
+
+$v = comdat any
+@v = external global i32, comdat
+; CHECK: Declaration may not be in a Comdat!