Add stopgap option -fmodule-implementation-of <name>

This flag specifies that we are building an implementation file of the
module <name>, preventing importing <name> as a module. This does not
consider this to be the 'current module' for the purposes of doing
modular checks like decluse or non-modular-include warnings, unlike
-fmodule-name.

This is needed as a stopgap until:
1) we can resolve relative includes to a VFS-mapped module (or can
   safely import a header textually and as part of a module)

and ideally
2) we can safely do incremental rebuilding when implementation files
   import submodules.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213767 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 0 deletions

diff --git a/include/clang/Basic/LangOptions.h b/include/clang/Basic/LangOptions.h
index 9bffc7cb18..fb406a2ed3 100644
--- a/include/clang/Basic/LangOptions.h
+++ b/include/clang/Basic/LangOptions.h
@@ -88,6 +88,11 @@ public:
   /// \brief The name of the current module.
   std::string CurrentModule;
 
+  /// \brief The name of the module that the translation unit is an
+  /// implementation of. Prevents semantic imports, but does not otherwise
+  /// treat this as the CurrentModule.
+  std::string ImplementationOfModule;
+
   /// \brief Options for parsing comments.
   CommentOptions CommentOpts;