diff --git a/cc/library_test.go b/cc/library_test.go
new file mode 100644
index 0000000..859b05a
--- /dev/null
+++ b/cc/library_test.go
@@ -0,0 +1,185 @@
+// Copyright 2017 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cc
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestLibraryReuse(t *testing.T) {
+	t.Run("simple", func(t *testing.T) {
+		ctx := testCc(t, `
+		cc_library {
+			name: "libfoo",
+			srcs: ["foo.c"],
+		}`)
+
+		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("ld")
+		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_static").Output("libfoo.a")
+
+		if len(libfooShared.Inputs) != 1 {
+			t.Fatalf("unexpected inputs to libfoo shared: %#v", libfooShared.Inputs.Strings())
+		}
+
+		if len(libfooStatic.Inputs) != 1 {
+			t.Fatalf("unexpected inputs to libfoo static: %#v", libfooStatic.Inputs.Strings())
+		}
+
+		if libfooShared.Inputs[0] != libfooStatic.Inputs[0] {
+			t.Errorf("static object not reused for shared library")
+		}
+	})
+
+	t.Run("extra static source", func(t *testing.T) {
+		ctx := testCc(t, `
+		cc_library {
+			name: "libfoo",
+			srcs: ["foo.c"],
+			static: {
+				srcs: ["bar.c"]
+			},
+		}`)
+
+		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("ld")
+		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_static").Output("libfoo.a")
+
+		if len(libfooShared.Inputs) != 1 {
+			t.Fatalf("unexpected inputs to libfoo shared: %#v", libfooShared.Inputs.Strings())
+		}
+
+		if len(libfooStatic.Inputs) != 2 {
+			t.Fatalf("unexpected inputs to libfoo static: %#v", libfooStatic.Inputs.Strings())
+		}
+
+		if libfooShared.Inputs[0] != libfooStatic.Inputs[0] {
+			t.Errorf("static object not reused for shared library")
+		}
+	})
+
+	t.Run("extra shared source", func(t *testing.T) {
+		ctx := testCc(t, `
+		cc_library {
+			name: "libfoo",
+			srcs: ["foo.c"],
+			shared: {
+				srcs: ["bar.c"]
+			},
+		}`)
+
+		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("ld")
+		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_static").Output("libfoo.a")
+
+		if len(libfooShared.Inputs) != 2 {
+			t.Fatalf("unexpected inputs to libfoo shared: %#v", libfooShared.Inputs.Strings())
+		}
+
+		if len(libfooStatic.Inputs) != 1 {
+			t.Fatalf("unexpected inputs to libfoo static: %#v", libfooStatic.Inputs.Strings())
+		}
+
+		if libfooShared.Inputs[0] != libfooStatic.Inputs[0] {
+			t.Errorf("static object not reused for shared library")
+		}
+	})
+
+	t.Run("extra static cflags", func(t *testing.T) {
+		ctx := testCc(t, `
+		cc_library {
+			name: "libfoo",
+			srcs: ["foo.c"],
+			static: {
+				cflags: ["-DFOO"],
+			},
+		}`)
+
+		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("ld")
+		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_static").Output("libfoo.a")
+
+		if len(libfooShared.Inputs) != 1 {
+			t.Fatalf("unexpected inputs to libfoo shared: %#v", libfooShared.Inputs.Strings())
+		}
+
+		if len(libfooStatic.Inputs) != 1 {
+			t.Fatalf("unexpected inputs to libfoo static: %#v", libfooStatic.Inputs.Strings())
+		}
+
+		if libfooShared.Inputs[0] == libfooStatic.Inputs[0] {
+			t.Errorf("static object reused for shared library when it shouldn't be")
+		}
+	})
+
+	t.Run("extra shared cflags", func(t *testing.T) {
+		ctx := testCc(t, `
+		cc_library {
+			name: "libfoo",
+			srcs: ["foo.c"],
+			shared: {
+				cflags: ["-DFOO"],
+			},
+		}`)
+
+		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("ld")
+		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_static").Output("libfoo.a")
+
+		if len(libfooShared.Inputs) != 1 {
+			t.Fatalf("unexpected inputs to libfoo shared: %#v", libfooShared.Inputs.Strings())
+		}
+
+		if len(libfooStatic.Inputs) != 1 {
+			t.Fatalf("unexpected inputs to libfoo static: %#v", libfooStatic.Inputs.Strings())
+		}
+
+		if libfooShared.Inputs[0] == libfooStatic.Inputs[0] {
+			t.Errorf("static object reused for shared library when it shouldn't be")
+		}
+	})
+
+	t.Run("global cflags for reused generated sources", func(t *testing.T) {
+		ctx := testCc(t, `
+		cc_library {
+			name: "libfoo",
+			srcs: [
+				"foo.c",
+				"a.proto",
+			],
+			shared: {
+				srcs: [
+					"bar.c",
+				],
+			},
+		}`)
+
+		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("ld")
+		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_static").Output("libfoo.a")
+
+		if len(libfooShared.Inputs) != 3 {
+			t.Fatalf("unexpected inputs to libfoo shared: %#v", libfooShared.Inputs.Strings())
+		}
+
+		if len(libfooStatic.Inputs) != 2 {
+			t.Fatalf("unexpected inputs to libfoo static: %#v", libfooStatic.Inputs.Strings())
+		}
+
+		if !reflect.DeepEqual(libfooShared.Inputs[0:2].Strings(), libfooStatic.Inputs.Strings()) {
+			t.Errorf("static objects not reused for shared library")
+		}
+
+		libfoo := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Module().(*Module)
+		if !inList("-DGOOGLE_PROTOBUF_NO_RTTI", libfoo.flags.CFlags) {
+			t.Errorf("missing protobuf cflags")
+		}
+	})
+}