1Fix handling of undef in partial LTO.

llvm-svn: 262497

3 files changed, 27 insertions, 0 deletions

diff --git a/lld/ELF/SymbolTable.cpp b/lld/ELF/SymbolTable.cpp
index 68a28c184fe..98fb79e621c 100644
--- a/lld/ELF/SymbolTable.cpp
+++ b/lld/ELF/SymbolTable.cpp
@@ -156,6 +156,8 @@ template <class ELFT> void SymbolTable<ELFT>::addCombinedLtoObject() {
   Obj->parse(DummyGroups);
   for (SymbolBody *Body : Obj->getSymbols()) {
     Symbol *Sym = insert(Body);
+    if (!Sym->Body->isUndefined() && Body->isUndefined())
+      continue;
     Sym->Body = Body;
   }
 }
diff --git a/lld/test/ELF/lto/Inputs/undef-mixed.s b/lld/test/ELF/lto/Inputs/undef-mixed.s
new file mode 100644
index 00000000000..2e4b7e114bb
--- /dev/null
+++ b/lld/test/ELF/lto/Inputs/undef-mixed.s
@@ -0,0 +1,3 @@
+        .globl  bar
+bar:
+        retq
diff --git a/lld/test/ELF/lto/undef-mixed.ll b/lld/test/ELF/lto/undef-mixed.ll
new file mode 100644
index 00000000000..0fff5781020
--- /dev/null
+++ b/lld/test/ELF/lto/undef-mixed.ll
@@ -0,0 +1,22 @@
+; REQUIRES: x86
+; RUN: llvm-mc %p/Inputs/undef-mixed.s -o %t.o -filetype=obj -triple=x86_64-pc-linux
+; RUN: llvm-as %s -o %t2.o
+; RUN: ld.lld %t2.o %t.o -o %t.so -shared
+; RUN: llvm-readobj -t %t.so | FileCheck %s
+
+; CHECK:      Name: bar
+; CHECK-NEXT: Value:
+; CHECK-NEXT: Size: 0
+; CHECK-NEXT: Binding: Global
+; CHECK-NEXT: Type: None
+; CHECK-NEXT: Other: 0
+; CHECK-NEXT: Section: .text
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+declare void @bar()
+define void @foo() {
+  call void @bar()
+  ret void
+}