From 2136b2e9345c23c26426110873dd97ef5d761ef2 Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Thu, 5 Mar 2009 04:18:07 +0000
Subject: Make IRGen compatible with declaring a function with incomplete
 return/argument types.  (The generated IR isn't ideal, but we can't really do
 better in general.)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66132 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/CodeGenModule.cpp | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

(limited to 'lib/CodeGen/CodeGenModule.cpp')

diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index 422415c2e2..a187f8a51b 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -779,13 +779,24 @@ void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
 llvm::GlobalValue *
 CodeGenModule::EmitForwardFunctionDefinition(const FunctionDecl *D,
                                              const llvm::Type *Ty) {
-  if (!Ty)
+  bool DoSetAttributes = true;
+  if (!Ty) {
     Ty = getTypes().ConvertType(D->getType());
+    if (!isa<llvm::FunctionType>(Ty)) {
+      // This function doesn't have a complete type (for example, the return
+      // type is an incomplete struct). Use a fake type instead, and make
+      // sure not to try to set attributes.
+      Ty = llvm::FunctionType::get(llvm::Type::VoidTy,
+                                   std::vector<const llvm::Type*>(), false);
+      DoSetAttributes = false;
+    }
+  }
   llvm::Function *F = llvm::Function::Create(cast<llvm::FunctionType>(Ty), 
                                              llvm::Function::ExternalLinkage,
                                              getMangledName(D),
                                              &getModule());
-  SetFunctionAttributes(D, F);
+  if (DoSetAttributes)
+    SetFunctionAttributes(D, F);
   return F;
 }
 
-- 
cgit v1.2.3-18-g5258