From 1b625535f0bd8d00a4b6d9fa53a8010c291fd6f3 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Mon, 29 Feb 2016 14:29:48 +0000
Subject: [PATCH] lto: don't fetch members for weak undef.

llvm-svn: 262225
---
 lld/ELF/InputFiles.cpp         |  6 +++---
 lld/test/ELF/lto/undef-weak.ll | 29 +++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 3 deletions(-)
 create mode 100644 lld/test/ELF/lto/undef-weak.ll

diff --git a/lld/ELF/InputFiles.cpp b/lld/ELF/InputFiles.cpp
index 5f5ac9e..78abcf9 100644
--- a/lld/ELF/InputFiles.cpp
+++ b/lld/ELF/InputFiles.cpp
@@ -454,11 +454,11 @@ void BitcodeFile::parse() {
     StringRef NameRef = Saver.save(StringRef(Name));
     SymbolBody *Body;
     uint32_t Flags = Sym.getFlags();
+    bool IsWeak = Flags & BasicSymbolRef::SF_Weak;
     if (Flags & BasicSymbolRef::SF_Undefined)
-      Body = new (Alloc) Undefined(NameRef, false, STV_DEFAULT, false);
+      Body = new (Alloc) Undefined(NameRef, IsWeak, STV_DEFAULT, false);
     else
-      Body =
-          new (Alloc) DefinedBitcode(NameRef, Flags & BasicSymbolRef::SF_Weak);
+      Body = new (Alloc) DefinedBitcode(NameRef, IsWeak);
     SymbolBodies.push_back(Body);
   }
 }
diff --git a/lld/test/ELF/lto/undef-weak.ll b/lld/test/ELF/lto/undef-weak.ll
new file mode 100644
index 0000000..215978a
--- /dev/null
+++ b/lld/test/ELF/lto/undef-weak.ll
@@ -0,0 +1,29 @@
+; REQUIRES: x86
+
+; RUN: llvm-as %S/Inputs/archive.ll -o %t1.o
+; RUN: rm -f %t.a
+; RUN: llvm-ar rcs %t.a %t1.o
+
+
+; RUN: llvm-as %s -o %t2.o
+; RUN: ld.lld -m elf_x86_64 %t2.o -o %t2.so %t.a -shared
+; RUN: llvm-readobj -t %t2.so | FileCheck %s
+target triple = "x86_64-unknown-linux-gnu"
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+declare extern_weak void @f()
+define void @foo() {
+  call void @f()
+  ret void
+}
+
+; We should not fetch the archive member.
+
+; CHECK:      Name: f ({{.*}})
+; CHECK-NEXT: Value: 0x0
+; CHECK-NEXT: Size: 0
+; CHECK-NEXT: Binding: Weak
+; CHECK-NEXT: Type: None
+; CHECK-NEXT: Other: 0
+; CHECK-NEXT: Section: Undefined
+
-- 
2.7.4