Add an F_Delete flag.

For now this only changes the handle Access.

llvm-svn: 319121

llvm/include/llvm/Support/FileSystem.h

@@ -683,7 +683,11 @@ enum OpenFlags : unsigned {
   F_Text = 4,
 
   /// Open the file for read and write.
-  F_RW = 8
+  F_RW = 8,
+
+  /// The returned handle can be used for deleting the file. Only makes a
+  /// difference on windows.
+  F_Delete = 16
 };
 
 /// @brief Create a uniquely named file.

llvm/lib/Support/Windows/Path.inc

@@ -1031,6 +1031,8 @@ std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
   DWORD Access = GENERIC_WRITE;
   if (Flags & F_RW)
     Access |= GENERIC_READ;
+  if (Flags & F_Delete)
+    Access |= DELETE;
 
   HANDLE H =
       ::CreateFileW(PathUTF16.begin(), Access,