More on GCC Back Ends - ReadList.com

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More on GCC Back Ends
\ Mike (25 Apr 2008)
. \ Aaron Gray (25 Apr 2008)
. \ David Edelsohn (25 Apr 2008)

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Subject:	More on GCC Back Ends
Group:	Gcc
From:	Mike
Date:	25 Apr 2008

http://gcc.gnu.org/onlinedocs/gccint/Back-End.html
This mentions a file "config.gcc" which I can't find in the GCC source.
This page tells too little I guess.

http://gcc.gnu.org/onlinedocs/gccint/Machine-Desc.html
This stuff would be useful if the GCC build process recognized that I
made some .MD file, but the build process just outputs "Configuration...
not supported...".

Is there a short list of steps to get a very minimal machine specific
back end going? Please point me to some better documents? :)