[Modules] If a module map resides in a system header directory, treat it as a system module.
This prevents -pedantic from causing warnings in the system headers
used to create modules. Fixes <rdar://problem/14201171>.
llvm-svn: 184560
diff --git a/clang/test/Modules/system_headers.m b/clang/test/Modules/system_headers.m
new file mode 100644
index 0000000..39b13ca
--- /dev/null
+++ b/clang/test/Modules/system_headers.m
@@ -0,0 +1,8 @@
+// Test that system-headerness works for building modules.
+
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t/cache -isystem %S/Inputs -pedantic -Werror %s -verify
+// expected-no-diagnostics
+
+@import warning;
+int i = bigger_than_int;