[modules] Tests for r245390.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@245391 91177308-0d34-0410-b5e6-96231b3b80d8

test/Modules/Inputs/explicit-build-overlap/a.h

@@ -0,0 +1 @@
+struct A {};

test/Modules/Inputs/explicit-build-overlap/b.h

@@ -0,0 +1 @@
+struct B {};

test/Modules/Inputs/explicit-build-overlap/def.map

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+module a { textual header "a.h" }
+module b { header "a.h" header "b.h" }

test/Modules/Inputs/explicit-build-overlap/use.map

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+module "use" {
+  use a
+}

test/Modules/explicit-build-overlap.cpp

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+// RUN: rm -rf %t
+// RUN: %clang_cc1 -x c++ -fmodules                   %S/Inputs/explicit-build-overlap/def.map -fmodule-name=a -emit-module -o %t/a.pcm
+// RUN: %clang_cc1 -x c++ -fmodules                   %S/Inputs/explicit-build-overlap/def.map -fmodule-name=b -emit-module -o %t/ba.pcm -fmodule-file=%t/a.pcm
+// RUN: %clang_cc1 -x c++ -fmodules -fmodule-map-file=%S/Inputs/explicit-build-overlap/use.map -fmodule-name=use -fmodule-file=%t/ba.pcm %s -verify -I%S/Inputs/explicit-build-overlap -fmodules-decluse
+//
+// RUN: %clang_cc1 -x c++ -fmodules                   %S/Inputs/explicit-build-overlap/def.map -fmodule-name=b -emit-module -o %t/b.pcm
+// RUN: %clang_cc1 -x c++ -fmodules                   %S/Inputs/explicit-build-overlap/def.map -fmodule-name=a -emit-module -o %t/ab.pcm -fmodule-file=%t/b.pcm
+// RUN: %clang_cc1 -x c++ -fmodules -fmodule-map-file=%S/Inputs/explicit-build-overlap/use.map -fmodule-name=use -fmodule-file=%t/ab.pcm %s -verify -I%S/Inputs/explicit-build-overlap -fmodules-decluse
+
+// expected-no-diagnostics
+#include "a.h"
+
+A a;
+B b;