From: Lauro Ramos Venancio <lauro.venancio@gmail.com>
Date: Tue, 19 Feb 2008 00:04:15 +0000 (+0000)
Subject: A global without initializer must be emitted as weak.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=95050fa665c51a29249725101a476de685f43a11;p=clang

A global without initializer must be emitted as weak.
Fix Olden/bh test.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@47292 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/CodeGen/CodeGenModule.cpp b/CodeGen/CodeGenModule.cpp
index ef05586fcc..d68fbe616d 100644
--- a/CodeGen/CodeGenModule.cpp
+++ b/CodeGen/CodeGenModule.cpp
@@ -244,6 +244,9 @@ void CodeGenModule::EmitGlobalVar(const FileVarDecl *D) {
   case VarDecl::Register:
     assert(0 && "Can't have auto or register globals");
   case VarDecl::None:
+    if (!D->getInit())
+      GV->setLinkage(llvm::GlobalVariable::WeakLinkage);
+    break;
   case VarDecl::Extern:
   case VarDecl::PrivateExtern:
     // todo: common
diff --git a/test/CodeGen/weak-global.c b/test/CodeGen/weak-global.c
new file mode 100644
index 0000000000..86e551c1ea
--- /dev/null
+++ b/test/CodeGen/weak-global.c
@@ -0,0 +1,3 @@
+// RUN: clang -emit-llvm < %s | grep weak
+
+int i;