--- /dev/null
+Test binaries created with the following commands:
+
+$ cat container.cpp
+#include "container.h"
+#include <stdlib.h>
+
+struct Container_ivars {
+ // real definition here
+};
+
+ContainerPtr allocateContainer() {
+ Container *c = (Container *)malloc(sizeof(Container));
+ c->ivars = (Container_ivars *)malloc(sizeof(Container_ivars));
+ return c;
+}
+
+extern void doSomething(ContainerPtr);
+
+int main() {
+ ContainerPtr c = allocateContainer();
+ doSomething(c);
+ return 0;
+}
+
+$ cat container.h
+struct Container_ivars;
+
+struct Container {
+ union {
+ struct Container_ivars *ivars;
+ };
+};
+
+typedef Container *ContainerPtr;
+
+$ cat use.cpp
+#include "container.h"
+
+void doSomething(ContainerPtr c) {}
+
+
+$ clang++ -O0 -g container.cpp -c -o container.o
+$ clang++ -O0 -g use.cpp -c -o use.o
+$ clang++ use.o container.o -o a.out
+
+Note that the link order in the last command matters for this test.
+
+RUN: dsymutil -oso-prepend-path %p/../Inputs %p/../Inputs/private/tmp/union/a.out -o %t.dSYM
+RUN: llvm-dwarfdump %t.dSYM | FileCheck %s
+
+CHECK: DW_TAG_compile_unit
+
+CHECK: DW_AT_name ("Container_ivars")
+CHECK-NEXT: DW_AT_declaration (true)
+
+CHECK: DW_TAG_compile_unit
+
+CHECK: DW_AT_name ("Container_ivars")
+CHECK-NEXT: DW_AT_byte_size (0x01)
+CHECK-NEXT: DW_AT_decl_file ("/tmp/union/container.cpp")
+CHECK-NEXT: DW_AT_decl_line (4)