[PATCH] Teach Clang how to use response files when calling other tools

[Rafael Auler]

Hi,

This is the updated patch implementing:
* using a raw_string_ostream to buffer the response file contents before calling writeFileWithEncoding() to write all the contents at once.
* removing virtual from Tool's member functions that deal with response files, following Rafael's suggestion.  

Best regards,
Rafael Auler

http://reviews.llvm.org/D4897

Files:
  include/clang/Driver/Compilation.h
  include/clang/Driver/Job.h
  include/clang/Driver/Tool.h
  lib/Driver/Compilation.cpp
  lib/Driver/Job.cpp
  lib/Driver/Tool.cpp
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  test/Driver/response-file.c
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