Recognise options to output dependency files and don't perform checks.
Report input file name when reporting a check failure so it is more obvious in large build logs.

Differential Revision: http://reviews.llvm.org/D10183

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@238928 91177308-0d34-0410-b5e6-96231b3b80d8

Files compiled with -via-file-asm should be byte for byte identical. This
change improves the checking on dash_s_no_change to detect non-code
differences. If there is a difference, the check goes on to compare code and
debug to try and be more informative.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@238926 91177308-0d34-0410-b5e6-96231b3b80d8

This is a tool for checking consistency of code generation with different
compiler options (such as -g or outputting to .s). This tool has found a number
of code generation issues. The script acts as a wrapper to clang or clang++
performing 2 (or more) compiles then comparing the object files. Instructions
for use are in check_cfc.py including how to use with LNT.

Differential Revision: http://reviews.llvm.org/D8723


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@233919 91177308-0d34-0410-b5e6-96231b3b80d8