Introduce a new clang-cc option

  -remap-file=from;to

which takes the file "from" and transparently replaces its contents
with the contents of the file "to" from the source manager's
perspective. This is the moral equivalent of

  cp from saved
  cp to from
  <call clang>
  cp saved from
  rm saved

without all of the pesky file copying.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@90307 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 19 insertions, 0 deletions

diff --git a/include/clang/Frontend/PreprocessorOptions.h b/include/clang/Frontend/PreprocessorOptions.h
index f0c1d3c2c3..c43a1feb8c 100644
--- a/include/clang/Frontend/PreprocessorOptions.h
+++ b/include/clang/Frontend/PreprocessorOptions.h
@@ -13,6 +13,7 @@
 #include "llvm/ADT/StringRef.h"
 #include <cassert>
 #include <string>
+#include <utility>
 #include <vector>
 
 namespace clang {
@@ -41,6 +42,21 @@ public:
   /// If given, a PTH cache file to use for speeding up header parsing.
   std::string TokenCache;
 
+  /// \brief The set of file remappings, which take existing files on
+  /// the system (the first part of each pair) and gives them the
+  /// contents of other files on the system (the second part of each
+  /// pair).
+  std::vector<std::pair<std::string, std::string> >  RemappedFiles;
+
+  typedef std::vector<std::pair<std::string, std::string> >::const_iterator
+    remapped_file_iterator;
+  remapped_file_iterator remapped_file_begin() const { 
+    return RemappedFiles.begin();
+  }
+  remapped_file_iterator remapped_file_end() const { 
+    return RemappedFiles.end();
+  }
+
 public:
   PreprocessorOptions() : UsePredefines(true) {}
 
@@ -50,6 +66,9 @@ public:
   void addMacroUndef(llvm::StringRef Name) {
     Macros.push_back(std::make_pair(Name, true));
   }
+  void addRemappedFile(llvm::StringRef From, llvm::StringRef To) {
+    RemappedFiles.push_back(std::make_pair(From, To));
+  }
 };
 
 } // end namespace clang