Fix the issue of mangling of local anonymous unions (Itanium C++ ABI):

A discriminator is used for the first occurrence of a name.
inline int f1 () {
  static union {
    int a;
    long int b;
  };

  static union {
    int c;
    double d;
  };

  return a+c;
}
The name of the second union is mangled as _ZZ2f1vE1c_0 instead of _ZZ2f1vE1c.

Differential Revision: http://reviews.llvm.org/D6295

llvm-svn: 224131

1 files changed, 42 insertions, 0 deletions

diff --git a/clang/test/CodeGenCXX/mangle-local-anonymous-unions.cpp b/clang/test/CodeGenCXX/mangle-local-anonymous-unions.cpp
new file mode 100644
index 00000000000..9187c1a5a27
--- /dev/null
+++ b/clang/test/CodeGenCXX/mangle-local-anonymous-unions.cpp
@@ -0,0 +1,42 @@
+// RUN: %clang_cc1 %s -emit-llvm -triple %itanium_abi_triple -o - | FileCheck %s
+
+// CHECK-DAG: @_ZZ2f0vE1a
+// CHECK-DAG: @_ZZ2f0vE1c
+// CHECK-DAG: @_ZZ2f0vE1e_0
+inline int f0() {
+  static union {
+    int a;
+    long int b;
+  };
+
+  static union {
+    int c;
+    double d;
+  };
+
+  if (0) {
+    static union {
+      int e;
+      int f;
+    };
+  }
+  static union {
+    int e;
+    int f;
+  };
+
+  return a+c;
+}
+
+inline void nop() {
+  static union {
+    union {
+    };
+  };
+}
+
+int f1 (int a, int c) {
+  nop();
+  return a+c+f0();
+}
+