Implement -working-directory.

When -working-directory is passed in command line, file paths are resolved relative to the specified directory.
This helps both when using libclang (where we can't require the user to actually change the working directory)
and to help reproduce test cases when the reproduction work comes along.

--FileSystemOptions is introduced which controls how file system operations are performed (currently it just contains
 the working directory value if set).
--FileSystemOptions are passed around to various interfaces that perform file operations.
--Opening & reading the content of files should be done only through FileManager. This is useful in general since
 file operations will be abstracted in the future for the reproduction mechanism.

FileSystemOptions is independent of FileManager so that we can have multiple translation units sharing the same
FileManager but with different FileSystemOptions.

Addresses rdar://8583824.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@118203 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 1 deletions

diff --git a/include/clang/Lex/HeaderSearch.h b/include/clang/Lex/HeaderSearch.h
index 80b38dee06..7d467a5680 100644
--- a/include/clang/Lex/HeaderSearch.h
+++ b/include/clang/Lex/HeaderSearch.h
@@ -23,6 +23,7 @@ namespace clang {
 class ExternalIdentifierLookup;
 class FileEntry;
 class FileManager;
+class FileSystemOptions;
 class IdentifierInfo;
 
 /// HeaderFileInfo - The preprocessor keeps track of this information for each
@@ -71,6 +72,7 @@ struct HeaderFileInfo {
 /// file referenced by a #include or #include_next, (sub-)framework lookup, etc.
 class HeaderSearch {
   FileManager &FileMgr;
+  const FileSystemOptions &FileSystemOpts;
 
   /// #include search path information.  Requests for #include "x" search the
   /// directory of the #including file first, then each directory in SearchDirs
@@ -118,10 +120,11 @@ class HeaderSearch {
   explicit HeaderSearch(const HeaderSearch&);
   void operator=(const HeaderSearch&);
 public:
-  HeaderSearch(FileManager &FM);
+  HeaderSearch(FileManager &FM, const FileSystemOptions &FSOpts);
   ~HeaderSearch();
 
   FileManager &getFileMgr() const { return FileMgr; }
+  const FileSystemOptions &getFileSystemOpts() const { return FileSystemOpts; }
 
   /// SetSearchPaths - Interface for setting the file search paths.
   ///