From b23cd2f6887d2d6333bc596d88eb93aa2e2a04e4 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Thu, 14 Oct 2004 19:53:50 +0000
Subject: [PATCH] Fix a bug John tracked down in libstdc++ where we were
 incorrectly deleting weak functions.  Thanks for finding this John!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16997 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/IPO/GlobalOpt.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Transforms/IPO/GlobalOpt.cpp b/lib/Transforms/IPO/GlobalOpt.cpp
index dc8832c4f36..e800e0c6001 100644
--- a/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/lib/Transforms/IPO/GlobalOpt.cpp
@@ -808,7 +808,8 @@ bool GlobalOpt::runOnModule(Module &M) {
     for (Module::iterator FI = M.begin(), E = M.end(); FI != E; ) {
       Function *F = FI++;
       F->removeDeadConstantUsers();
-      if (F->use_empty() && (F->hasInternalLinkage() || F->hasWeakLinkage())) {
+      if (F->use_empty() && (F->hasInternalLinkage() ||
+                             F->hasLinkOnceLinkage())) {
         M.getFunctionList().erase(F);
         LocalChange = true;
         ++NumFnDeleted;
-- 
2.11.0