[Modules] Add testcase for builtins used in umbrella headers

This used to work before r284797 + r285152, which exposed something
interesting; some users include builtins from umbrella headers.

Clang should emit a warning to warn users this is not a good practice
and umbrella headers shouldn't get the
implicitly-add-the-builtin-version behavior for builtin header names.

While we're not there, add the testcase to represent the way it
currently works.

llvm-svn: 285377

3 files changed, 33 insertions, 0 deletions

diff --git a/clang/test/Modules/Inputs/libc-libcxx/sysroot/Frameworks/A.framework/Headers/A.h b/clang/test/Modules/Inputs/libc-libcxx/sysroot/Frameworks/A.framework/Headers/A.h
new file mode 100644
index 00000000000..2ee00c1129a
--- /dev/null
+++ b/clang/test/Modules/Inputs/libc-libcxx/sysroot/Frameworks/A.framework/Headers/A.h
@@ -0,0 +1,15 @@
+#ifndef __my_a
+#define __my_a
+
+#include <A/int.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+typedef int_fast32_t my_a;
+}
+
+#endif
diff --git a/clang/test/Modules/Inputs/libc-libcxx/sysroot/Frameworks/A.framework/Headers/int.h b/clang/test/Modules/Inputs/libc-libcxx/sysroot/Frameworks/A.framework/Headers/int.h
new file mode 100644
index 00000000000..340315ed9f5
--- /dev/null
+++ b/clang/test/Modules/Inputs/libc-libcxx/sysroot/Frameworks/A.framework/Headers/int.h
@@ -0,0 +1,14 @@
+#ifndef __my_int
+#define __my_int
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+typedef int_fast32_t myint;
+}
+
+#endif
diff --git a/clang/test/Modules/Inputs/libc-libcxx/sysroot/Frameworks/A.framework/Modules/module.modulemap b/clang/test/Modules/Inputs/libc-libcxx/sysroot/Frameworks/A.framework/Modules/module.modulemap
new file mode 100644
index 00000000000..1e91233a90c
--- /dev/null
+++ b/clang/test/Modules/Inputs/libc-libcxx/sysroot/Frameworks/A.framework/Modules/module.modulemap
@@ -0,0 +1,4 @@
+framework module A [extern_c] {
+    umbrella header "A.h"
+    export *
+}