[Modules] Fix misleading warning about missing textual header in umbrella header

When a textual header is present inside a umbrella dir but not in the
header, we get the misleading warning:

warning: umbrella header for module 'FooFramework' does not include
header 'Baz_Private.h'

The module map in question:

framework module FooFramework {
    umbrella header "FooUmbrella.h"

    export *
    module * { export * }

    module Private {
        textual header "Baz_Private.h"
    }
}

Fix this by taking textual headers into account.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@291794 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Lex/ModuleMap.cpp

@@ -446,9 +446,19 @@ ModuleMap::isHeaderUnavailableInModule(const FileEntry *Header,
              I = Known->second.begin(),
              E = Known->second.end();
          I != E; ++I) {
-      if (I->isAvailable() && (!RequestingModule ||
-                               I->getModule()->isSubModuleOf(RequestingModule)))
+
+      if (I->isAvailable() &&
+          (!RequestingModule ||
+           I->getModule()->isSubModuleOf(RequestingModule))) {
+        // When no requesting module is available, the caller is looking if a
+        // header is part a module by only looking into the module map. This is
+        // done by warn_uncovered_module_header checks; don't consider textual
+        // headers part of it in this mode, otherwise we get misleading warnings
+        // that a umbrella header is not including a textual header.
+        if (!RequestingModule && I->getRole() == ModuleMap::TextualHeader)
+          continue;
         return false;
+      }
     }
     return true;
   }

test/Modules/Inputs/FooFramework.framework/Modules/module.modulemap

@@ -0,0 +1,12 @@
+framework module FooFramework {
+    umbrella header "FooUmbrella.h"
+
+    export *
+    module * {
+        export *
+    }
+
+    explicit module Private {
+        textual header "Baz_Private.h"
+    }
+}

test/Modules/Inputs/FooFramework.framework/PrivateHeaders/Bar.h

@@ -0,0 +1,2 @@
+@interface Bar
+@end

test/Modules/Inputs/FooFramework.framework/PrivateHeaders/Baz_Private.h

@@ -0,0 +1,3 @@
+#ifndef Baz_h
+#define Baz_h
+#endif /* Baz_h */

test/Modules/Inputs/FooFramework.framework/PrivateHeaders/Foo.h

@@ -0,0 +1,10 @@
+__attribute__((objc_root_class))
+@interface NSObject
++ (instancetype) alloc;
+- (instancetype) init;
+- (instancetype)retain;
+- (void)release;
+@end
+
+@interface Foo : NSObject
+@end

test/Modules/Inputs/FooFramework.framework/PrivateHeaders/FooUmbrella.h

@@ -0,0 +1,3 @@
+#import <FooFramework/Foo.h>
+#import <FooFramework/Bar.h>
+

test/Modules/textual-hdr-in-umbrella-hdr.m

@@ -0,0 +1,10 @@
+// RUN: rm -rf %t.cache
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t.cache \
+// RUN:   %s -fsyntax-only -F %S/Inputs -Wincomplete-umbrella -verify
+
+// expected-no-diagnostics
+
+#import <FooFramework/Foo.h>
+
+@implementation Foo
+@end