[CodeGen] Change getSDagStackGuard to get an internal sym.

Fixes a crash in the backend during an LTO build of rtld(1) in
FreeBSD.

llvm-svn: 272262

2 files changed, 14 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
index 67b2ee96283..52ab7cf3763 100644
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -1831,7 +1831,7 @@ void TargetLoweringBase::insertSSPDeclarations(Module &M) const {
 // Currently only support "standard" __stack_chk_guard.
 // TODO: add LOAD_STACK_GUARD support.
 Value *TargetLoweringBase::getSDagStackGuard(const Module &M) const {
-  return M.getGlobalVariable("__stack_chk_guard");
+  return M.getGlobalVariable("__stack_chk_guard", true);
 }
 
 Value *TargetLoweringBase::getSSPStackGuardCheck(const Module &M) const {
diff --git a/llvm/test/CodeGen/Generic/stackguard-internal.ll b/llvm/test/CodeGen/Generic/stackguard-internal.ll
new file mode 100644
index 00000000000..4b815c98fb1
--- /dev/null
+++ b/llvm/test/CodeGen/Generic/stackguard-internal.ll
@@ -0,0 +1,13 @@
+; Check that the backend doesn't crash.
+; RUN: llc -mtriple=x86_64-pc-freebsd %s -o - | FileCheck %s
+
+@__stack_chk_guard = internal global [8 x i64] zeroinitializer, align 16
+
+define void @f() sspstrong {
+  %tbl = alloca [4 x i64], align 16
+  ret void
+}
+
+; CHECK:  .type __stack_chk_guard,@object
+; CHECK:  .local  __stack_chk_guard
+; CHECK:  .comm __stack_chk_guard,64,16