From 6e03a7476fdfd428cb9ed96023008cb9abd54dee Mon Sep 17 00:00:00 2001
From: Argyrios Kyrtzidis <akyrtzi@gmail.com>
Date: Thu, 29 Jul 2010 20:07:52 +0000
Subject: Weak references and variables that are not definitions are not
 required for early codegen/deserialization.

llvm-svn: 109796
---
 clang/lib/AST/ASTContext.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'clang/lib/AST/ASTContext.cpp')

diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index af19e89fd9d..633538f3129 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -5550,6 +5550,10 @@ bool ASTContext::DeclIsRequiredFunctionOrFileScopedVar(const Decl *D) {
   } else if (!isa<FunctionDecl>(D))
     return false;
 
+  // Weak references don't produce any output by themselves.
+  if (D->hasAttr<WeakRefAttr>())
+    return false;
+
   // Aliases and used decls are required.
   if (D->hasAttr<AliasAttr>() || D->hasAttr<UsedAttr>())
     return true;
@@ -5587,6 +5591,9 @@ bool ASTContext::DeclIsRequiredFunctionOrFileScopedVar(const Decl *D) {
   const VarDecl *VD = cast<VarDecl>(D);
   assert(VD->isFileVarDecl() && "Expected file scoped var");
 
+  if (VD->isThisDeclarationADefinition() == VarDecl::DeclarationOnly)
+    return false;
+
   // Structs that have non-trivial constructors or destructors are required.
 
   // FIXME: Handle references.
-- 
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