[Modules] Add Darwin-specific compatibility module map parsing hacks

This preserves backwards compatibility for two hacks in the Darwin
system module map files:

1. The use of 'requires excluded' to make headers non-modular, which
should really be mapped to 'textual' now that we have this feature.

2. Silently removes a bogus cplusplus requirement from IOKit.avc.

Once we start diagnosing missing requirements and headers on
auto-imports these would have broken compatibility with existing Darwin
SDKs.

llvm-svn: 244912

4 files changed, 48 insertions, 0 deletions

diff --git a/clang/test/Modules/Inputs/System/usr/include/assert.h b/clang/test/Modules/Inputs/System/usr/include/assert.h
new file mode 100644
index 00000000000..844e3790912
--- /dev/null
+++ b/clang/test/Modules/Inputs/System/usr/include/assert.h
@@ -0,0 +1,2 @@
+// assert.h
+#define DARWIN_C_EXCLUDED 1
diff --git a/clang/test/Modules/Inputs/System/usr/include/module.map b/clang/test/Modules/Inputs/System/usr/include/module.map
index 9b2f3af2bac..1d88ca380f4 100644
--- a/clang/test/Modules/Inputs/System/usr/include/module.map
+++ b/clang/test/Modules/Inputs/System/usr/include/module.map
@@ -30,3 +30,25 @@ module uses_other_constants {
   header "uses_other_constants.h"
   export *
 }
+
+module Darwin {
+  module C {
+    module excluded {
+      requires excluded
+      header "assert.h"
+    }
+  }
+}
+
+module Tcl {
+  module Private {
+    requires excluded
+    umbrella ""
+  }
+}
+
+module IOKit {
+  module avc {
+    requires cplusplus
+  }
+}
diff --git a/clang/test/Modules/Inputs/System/usr/include/tcl-private/header.h b/clang/test/Modules/Inputs/System/usr/include/tcl-private/header.h
new file mode 100644
index 00000000000..0e8fb64a712
--- /dev/null
+++ b/clang/test/Modules/Inputs/System/usr/include/tcl-private/header.h
@@ -0,0 +1,2 @@
+// tcl-private/header.h
+#define TCL_PRIVATE 1
diff --git a/clang/test/Modules/darwin_specific_modulemap_hacks.m b/clang/test/Modules/darwin_specific_modulemap_hacks.m
new file mode 100644
index 00000000000..82fc6978838
--- /dev/null
+++ b/clang/test/Modules/darwin_specific_modulemap_hacks.m
@@ -0,0 +1,22 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fimplicit-module-maps -isystem %S/Inputs/System/usr/include -triple x86_64-apple-darwin10 %s -verify -fsyntax-only
+// expected-no-diagnostics
+
+@import Darwin.C.excluded; // no error, header is implicitly 'textual'
+@import Tcl.Private;       // no error, header is implicitly 'textual'
+@import IOKit.avc;         // no error, cplusplus requirement removed
+
+#if defined(DARWIN_C_EXCLUDED)
+#error assert.h should be textual
+#elif defined(TCL_PRIVATE)
+#error tcl-private/header.h should be textual
+#endif
+
+#import <assert.h>
+#import <tcl-private/header.h>
+
+#if !defined(DARWIN_C_EXCLUDED)
+#error assert.h missing
+#elif !defined(TCL_PRIVATE)
+#error tcl-private/header.h missing
+#endif