[PCH] When validating that the files coming from PCH did not change, also

validate that we didn't override the contents of any of such files.

If this is detected, emit a diagnostic error and recover gracefully
by using the contents of the original file that the PCH was built from.

Part of rdar://11305263

llvm-svn: 156107

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/Basic/FileManager.cpp b/clang/lib/Basic/FileManager.cpp
index fd6d33463a2..669bf7d4c78 100644
--- a/clang/lib/Basic/FileManager.cpp
+++ b/clang/lib/Basic/FileManager.cpp
@@ -584,6 +584,12 @@ void FileManager::GetUniqueIDMapping(
       UIDToFiles[(*VFE)->getUID()] = *VFE;
 }
 
+void FileManager::modifyFileEntry(FileEntry *File,
+                                  off_t Size, time_t ModificationTime) {
+  File->Size = Size;
+  File->ModTime = ModificationTime;
+}
+
 
 void FileManager::PrintStats() const {
   llvm::errs() << "\n*** File Manager Stats:\n";