Disallow aliases to available_externally.
They are as much trouble as aliases to declarations. They are requiring
the code generator to define a symbol with the same value as another
symbol, but the second symbol is undefined.
If representing this is important for some optimization, we could add
support for available_externally aliases. They would be *required* to
point to a declaration (or available_externally definition).
llvm-svn: 254170
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index cf7b4ca..617d965 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -571,7 +571,8 @@
void Verifier::visitAliaseeSubExpr(SmallPtrSetImpl<const GlobalAlias*> &Visited,
const GlobalAlias &GA, const Constant &C) {
if (const auto *GV = dyn_cast<GlobalValue>(&C)) {
- Assert(!GV->isDeclaration(), "Alias must point to a definition", &GA);
+ Assert(!GV->isDeclarationForLinker(), "Alias must point to a definition",
+ &GA);
if (const auto *GA2 = dyn_cast<GlobalAlias>(GV)) {
Assert(Visited.insert(GA2).second, "Aliases cannot form a cycle", &GA);