fix a fixme: non-proto struct returning function definitions should be compiled

to something like:
define void @bar(%struct.foo* noalias sret %agg.result) nounwind {
instead of:
define void @bar(%struct.foo* noalias sret %agg.result, ...) nounwind {



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67475 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 4 deletions

diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index 4cd046d74e..6f745f2b90 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -859,10 +859,13 @@ void CodeGenModule::EmitGlobalFunctionDefinition(const FunctionDecl *D) {
   // As a special case, make sure that definitions of K&R function
   // "type foo()" aren't declared as varargs (which forces the backend
   // to do unnecessary work).
-  // FIXME: what about stret() functions, this doesn't handle them!?
-  if (Ty->isVarArg() && Ty->getNumParams() == 0)
-    Ty = llvm::FunctionType::get(Ty->getReturnType(),
-                                 std::vector<const llvm::Type*>(), false);
+  if (D->getType()->isFunctionNoProtoType()) {
+    assert(Ty->isVarArg() && "Didn't lower type as expected");
+    // Due to stret, the lowered function could have arguments.  Just create the
+    // same type as was lowered by ConvertType but strip off the varargs bit.
+    std::vector<const llvm::Type*> Args(Ty->param_begin(), Ty->param_end());
+    Ty = llvm::FunctionType::get(Ty->getReturnType(), Args, false);
+  }
 
   // Get or create the prototype for teh function.
   llvm::Constant *Entry = GetAddrOfFunction(D, Ty);