From 274c9ff5404582ff22769d9599ab10ed216ceec3 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Tue, 2 May 2017 18:31:09 +0000
Subject: Vendor import of lld trunk r301939:
 https://llvm.org/svn/llvm-project/lld/trunk@301939

---
 ELF/LTO.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'ELF/LTO.cpp')

diff --git a/ELF/LTO.cpp b/ELF/LTO.cpp
index dd435173101a..de0d45bea1c4 100644
--- a/ELF/LTO.cpp
+++ b/ELF/LTO.cpp
@@ -105,6 +105,11 @@ BitcodeCompiler::~BitcodeCompiler() = default;
 static void undefine(Symbol *S) {
   replaceBody<Undefined>(S, S->body()->getName(), /*IsLocal=*/false,
                          STV_DEFAULT, S->body()->Type, nullptr);
+  // It shouldn't normally matter what the binding is, but if a bug in the LTO
+  // implementation causes it to fail to provide a definition for a symbol,
+  // setting the binding to STB_GLOBAL will cause the linker to report an
+  // undefined symbol error, even if the definition was weak.
+  S->Binding = STB_GLOBAL;
 }
 
 void BitcodeCompiler::add(BitcodeFile &F) {
-- 
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