Add a driver option -ivfsoverlay

Reads the description of a virtual filesystem from a file and overlays
it over the real file system.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@202176 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 0 deletions

diff --git a/include/clang/Lex/HeaderSearchOptions.h b/include/clang/Lex/HeaderSearchOptions.h
index b471b8cafe..5abcdad2d5 100644
--- a/include/clang/Lex/HeaderSearchOptions.h
+++ b/include/clang/Lex/HeaderSearchOptions.h
@@ -129,6 +129,9 @@ public:
   /// \brief The set of user-provided module-map-files.
   llvm::SetVector<std::string> ModuleMapFiles;
 
+  /// \brief The set of user-provided virtual filesystem overlay files.
+  std::vector<std::string> VFSOverlayFiles;
+
   /// Include the compiler builtin includes.
   unsigned UseBuiltinIncludes : 1;
 
@@ -172,6 +175,10 @@ public:
   void AddSystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader) {
     SystemHeaderPrefixes.push_back(SystemHeaderPrefix(Prefix, IsSystemHeader));
   }
+
+  void AddVFSOverlayFile(StringRef Name) {
+    VFSOverlayFiles.push_back(Name);
+  }
 };
 
 } // end namespace clang