fix PR11464 by preventing the linker from mapping two different struct types from the source module onto the same opaque destination type. An opaque type can only be resolved to one thing or another after all.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146929 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Linker/multiple-merged-structs.ll b/test/Linker/multiple-merged-structs.ll
new file mode 100644
index 0000000..348cd89
--- /dev/null
+++ b/test/Linker/multiple-merged-structs.ll
@@ -0,0 +1,19 @@
+; RUN: echo {%bug_type = type opaque \
+; RUN: declare i32 @bug_a(%bug_type*) \
+; RUN: declare i32 @bug_b(%bug_type*) } > %t.ll
+; RUN: llvm-link %t.ll %s
+; PR11464
+
+%bug_type = type { %bug_type* }
+%bar = type { i32 }
+
+define i32 @bug_a(%bug_type* %fp) nounwind uwtable {
+entry:
+ %d_stream = getelementptr inbounds %bug_type* %fp, i64 0, i32 0
+ ret i32 0
+}
+
+define i32 @bug_b(%bar* %a) nounwind uwtable {
+entry:
+ ret i32 0
+}