Fix PR19351. While building up a composite type it is important to use

a non-uniqueable temporary node that is only turned into a permanent
unique or distinct node after it is finished.
Otherwise an intermediate node may get accidentally uniqued with another
node as illustrated by the testcase.

Paired commit with LLVM.

llvm-svn: 228855

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/test/CodeGen/debug-info-same-line.c b/clang/test/CodeGen/debug-info-same-line.c
new file mode 100644
index 00000000000..dddabda8695
--- /dev/null
+++ b/clang/test/CodeGen/debug-info-same-line.c
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin -emit-llvm %s -g -o - | FileCheck %s
+// Here two temporary nodes are identical (but should not get uniqued) while
+// building the full debug type.
+typedef struct { long x; } foo; typedef struct {  foo *x; } bar;
+// CHECK: [ DW_TAG_structure_type ] [line 4, size 64,
+// CHECK: [ DW_TAG_structure_type ] [line 4, size 64,
+bar b;