[llvm] r281366 - [LTO] Don't pass SF_Undefined symbols to the IRmover.

[Davide Italiano via llvm-commits]

Author: davide
Date: Tue Sep 13 13:45:13 2016
New Revision: 281366

URL: http://llvm.org/viewvc/llvm-project?rev=281366&view=rev
Log:
[LTO] Don't pass SF_Undefined symbols to the IRmover.

This should fix PR 30363.

Added:
    llvm/trunk/test/tools/gold/X86/asm_undefined.ll
Modified:
    llvm/trunk/lib/LTO/LTO.cpp

Modified: llvm/trunk/lib/LTO/LTO.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/LTO/LTO.cpp?rev=281366&r1=281365&r2=281366&view=diff
==============================================================================
--- llvm/trunk/lib/LTO/LTO.cpp (original)
+++ llvm/trunk/lib/LTO/LTO.cpp Tue Sep 13 13:45:13 2016
@@ -337,6 +337,8 @@ Error LTO::addRegularLTO(std::unique_ptr
     addSymbolToGlobalRes(Obj.get(), Used, Sym, Res, 0);
 
     GlobalValue *GV = Obj->getSymbolGV(Sym.I->getRawDataRefImpl());
+    if (Sym.getFlags() & object::BasicSymbolRef::SF_Undefined)
+      continue;
     if (Res.Prevailing && GV) {
       Keep.push_back(GV);
       switch (GV->getLinkage()) {

Added: llvm/trunk/test/tools/gold/X86/asm_undefined.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/tools/gold/X86/asm_undefined.ll?rev=281366&view=auto
==============================================================================
--- llvm/trunk/test/tools/gold/X86/asm_undefined.ll (added)
+++ llvm/trunk/test/tools/gold/X86/asm_undefined.ll Tue Sep 13 13:45:13 2016
@@ -0,0 +1,18 @@
+; RUN: llvm-as %s -o %t.o
+; RUN: %gold -shared -m elf_x86_64 -o %t2 -plugin %llvmshlibdir/LLVMgold.so \
+; RUN: %t.o --plugin-opt=save-temps
+; RUN: llvm-nm %t2 | FileCheck %s --check-prefix=OUTPUT
+
+; OUTPUT: w patatino
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+module asm ".weak patatino"
+
+declare void @patatino()
+
+define void @_start() {
+  call void @patatino()
+  ret void
+}