Do not print inferred submodules explicitly in __inferred_module.map

Otherwise including a header in your source file that is not included by
framework's umbrella header will silently add an empty submodule with that
name.

is automatically translated to
@import Foo.NotInModule;

which then would have succeeded because the inferred module map
contained an empty submodule called NotInModule.

llvm-svn: 207024

clang/include/clang/Basic/Module.h

@@ -150,6 +150,9 @@ public:
   /// imported within such a block).
   unsigned IsExternC : 1;
 
+  /// \brief Whether this is an inferred submodule (module * { ... }).
+  unsigned IsInferred : 1;
+
   /// \brief Whether we should infer submodules for this module based on 
   /// the headers.
   ///

clang/lib/Basic/Module.cpp

@@ -29,9 +29,10 @@ Module::Module(StringRef Name, SourceLocation DefinitionLoc, Module *Parent,
     : Name(Name), DefinitionLoc(DefinitionLoc), Parent(Parent), ModuleMap(File),
       Umbrella(), ASTFile(0), IsMissingRequirement(false), IsAvailable(true),
       IsFromModuleFile(false), IsFramework(IsFramework), IsExplicit(IsExplicit),
-      IsSystem(false), IsExternC(false), InferSubmodules(false),
-      InferExplicitSubmodules(false), InferExportWildcard(false),
-      ConfigMacrosExhaustive(false), NameVisibility(Hidden) {
+      IsSystem(false), IsExternC(false), IsInferred(false),
+      InferSubmodules(false), InferExplicitSubmodules(false),
+      InferExportWildcard(false), ConfigMacrosExhaustive(false),
+      NameVisibility(Hidden) {
   if (Parent) {
     if (!Parent->isAvailable())
       IsAvailable = false;
@@ -360,7 +361,8 @@ void Module::print(raw_ostream &OS, unsigned Indent) const {
   
   for (submodule_const_iterator MI = submodule_begin(), MIEnd = submodule_end();
        MI != MIEnd; ++MI)
-    (*MI)->print(OS, Indent + 2);
+    if (!(*MI)->IsInferred)
+      (*MI)->print(OS, Indent + 2);
   
   for (unsigned I = 0, N = Exports.size(); I != N; ++I) {
     OS.indent(Indent + 2);

clang/lib/Lex/ModuleMap.cpp

@@ -365,6 +365,7 @@ ModuleMap::findModuleForHeader(const FileEntry *File,
             llvm::sys::path::stem(SkippedDirs[I-1]->getName()), NameBuf);
         Result = findOrCreateModule(Name, Result, UmbrellaModule->ModuleMap,
                                     /*IsFramework=*/false, Explicit).first;
+        Result->IsInferred = true;
 
         // Associate the module and the directory.
         UmbrellaDirs[SkippedDirs[I-1]] = Result;
@@ -381,6 +382,7 @@ ModuleMap::findModuleForHeader(const FileEntry *File,
                          llvm::sys::path::stem(File->getName()), NameBuf);
       Result = findOrCreateModule(Name, Result, UmbrellaModule->ModuleMap,
                                   /*IsFramework=*/false, Explicit).first;
+      Result->IsInferred = true;
       Result->addTopHeader(File);
 
       // If inferred submodules export everything they import, add a

clang/test/Modules/missing-submodule.m

@@ -0,0 +1,7 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -F %S/Inputs %s -verify
+#include <Module/NotInModule.h> // expected-warning{{missing submodule 'Module.NotInModule'}}
+
+int getNotInModule() {
+  return not_in_module;
+}