From 5f92811f305a3fe9ce90199f68a1026123bc8d51 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Wed, 14 Jan 2015 13:53:50 +0000
Subject: [PATCH] Handle a symbol being undefined.

This can happen if:
* It is present in a comdat in one file.
* It is not present in the comdat of the file that is kept.
* Is is not used.

This should fix the LTO boostrap.

Thanks to Takumi NAKAMURA for setting up the bot!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225983 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/tools/gold/Inputs/comdat.ll | 5 +++++
 tools/gold/gold-plugin.cpp       | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/test/tools/gold/Inputs/comdat.ll b/test/tools/gold/Inputs/comdat.ll
index 8b699d439c5..464aefa49dc 100644
--- a/test/tools/gold/Inputs/comdat.ll
+++ b/test/tools/gold/Inputs/comdat.ll
@@ -1,4 +1,9 @@
 $c2 = comdat any
+$c1 = comdat any
+
+; This is only present in this file. The linker will keep $c1 from the first
+; file and this will be undefined.
+@will_be_undefined = global i32 1, comdat($c1)
 
 @v1 = weak_odr global i32 41, comdat($c2)
 define weak_odr protected i32 @f1(i8* %this) comdat($c2) {
diff --git a/tools/gold/gold-plugin.cpp b/tools/gold/gold-plugin.cpp
index 1ba08cc53dc..bcc91e9d061 100644
--- a/tools/gold/gold-plugin.cpp
+++ b/tools/gold/gold-plugin.cpp
@@ -629,10 +629,14 @@ getModuleForFile(LLVMContext &Context, claimed_file &F, raw_fd_ostream *ApiFile,
     case LDPR_RESOLVED_IR:
     case LDPR_RESOLVED_EXEC:
     case LDPR_RESOLVED_DYN:
-    case LDPR_UNDEF:
       assert(GV->isDeclarationForLinker());
       break;
 
+    case LDPR_UNDEF:
+      assert(GV->hasComdat());
+      Drop.insert(GV);
+      break;
+
     case LDPR_PREVAILING_DEF_IRONLY: {
       keepGlobalValue(*GV, KeptAliases);
       if (!Used.count(GV)) {