[PATCH] pr21217 - -fmodule-map-file should warn on non-existent file

[Daniel Jasper]

This basically looks good to me, but I'd like Richard to take a look, too.

================
Comment at: include/clang/Basic/DiagnosticLexKinds.td:615
@@ +614,3 @@
+def warn_module_map_not_found : Warning<
+  "File '%0' from -fmodule-map-file=%0 not found">,
+  InGroup<ModuleMapMissing>;
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I'd phrase it as:

  "File '%0' specified via -fmodule-map-file not found"

================
Comment at: test/Modules/pr21217.cpp:6-8
@@ +5,4 @@
+
+#include "Inputs/private/common.h"
+
+void empty() {}
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Do these serve any purpose?

http://reviews.llvm.org/D6324