From 1fcd0f15813d390b1c5cc04811fcca3ff761ddb5 Mon Sep 17 00:00:00 2001
From: Nick Lewycky <nicholas@mxc.ca>
Date: Tue, 26 Jul 2011 08:40:36 +0000
Subject: [PATCH] Don't try to dereference syms[0] on an empty vector. Reported
 by Todd Jackson and Jeffrey Bosboom!

llvm-svn: 136066
---
 llvm/tools/gold/gold-plugin.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/llvm/tools/gold/gold-plugin.cpp b/llvm/tools/gold/gold-plugin.cpp
index 9e43bef31f8e..8cb4fb4bca41 100644
--- a/llvm/tools/gold/gold-plugin.cpp
+++ b/llvm/tools/gold/gold-plugin.cpp
@@ -360,6 +360,8 @@ static ld_plugin_status all_symbols_read_hook(void) {
   bool anySymbolsPreserved = false;
   for (std::list<claimed_file>::iterator I = Modules.begin(),
          E = Modules.end(); I != E; ++I) {
+    if (I->syms.empty())
+      continue;
     (*get_symbols)(I->handle, I->syms.size(), &I->syms[0]);
     for (unsigned i = 0, e = I->syms.size(); i != e; i++) {
       if (I->syms[i].resolution == LDPR_PREVAILING_DEF) {