Verify that attributes are not lost during linking.

We don't want to lose attributes when a function decl without them is merged
with a function decl that has them.
PR2382

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200030 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 22 insertions, 0 deletions

diff --git a/test/Linker/func-attrs-a.ll b/test/Linker/func-attrs-a.ll
new file mode 100644
index 0000000000..d5495e1e3f
--- /dev/null
+++ b/test/Linker/func-attrs-a.ll
@@ -0,0 +1,14 @@
+; RUN: llvm-link %s %p/func-attrs-b.ll -S -o - | FileCheck %s
+; PR2382
+
+; CHECK: call void @check0(%struct.S0* sret null, %struct.S0* byval align 4 null, %struct.S0* align 4 null, %struct.S0* byval align 4 null)
+; CHECK: define void @check0(%struct.S0* sret %agg.result, %struct.S0* byval %arg0, %struct.S0* %arg1, %struct.S0* byval %arg2)
+
+%struct.S0 = type <{ i8, i8, i8, i8 }>
+
+define void @a() {
+  call void @check0(%struct.S0* sret null, %struct.S0* byval align 4 null, %struct.S0* align 4 null, %struct.S0* byval align 4 null)
+  ret void
+}
+
+declare void @check0(%struct.S0*, %struct.S0*, %struct.S0*, %struct.S0*)
diff --git a/test/Linker/func-attrs-b.ll b/test/Linker/func-attrs-b.ll
new file mode 100644
index 0000000000..df78e5f54a
--- /dev/null
+++ b/test/Linker/func-attrs-b.ll
@@ -0,0 +1,8 @@
+; This file is used with func-attrs-a.ll
+; RUN: true
+
+%struct.S0 = type <{ i8, i8, i8, i8 }>
+
+define void @check0(%struct.S0* sret %agg.result, %struct.S0* byval %arg0, %struct.S0* %arg1, %struct.S0* byval %arg2) {
+  ret void
+}