libbfd support for OS X, MinGW, CygWin and Linux/Ubuntu

[nihilus]

I've implemented a parser using libbfd if found by my cmake-script on my fork at https://github.com/nihilus/snowman

We always use snowman's built-in parsers for Mach-O (unless it is a universal binary which the built-in parse doesn't handle.) and PE-files and will fallback on the ELF-parser if libbfd is unable to parse an ELF-file (depending on configuration and such things).

Works pretty good with my ECOFF-files as well as ELF files.
Consider it as a poor man's IDA plugin replacement (although it is better for some file formats).

[yegord]

If you want it to be merged to master, please format a patch and make a pull request.

[nihilus]

I will do when I figured out how to best parse Mach-O 'ar' archives... Seems like they are nested archives. Not too difficult but one should be able to pick which file in an archive to decompile in the GUI.

[nihilus]

Before making the pull I will implement support for architecture depended fixup for relocs as described here: ftp://ftp.gnu.org/old-gnu/Manuals/bfd-2.9.1/html_chapter/bfd_2.html#SEC82

[ghost]

Is this fork still in the process of being merged with the master copy of Snowman? If not, is there anything I can do to help move the process along? I really need Cygwin support from nihilus' branch and the newest patches from yegord's branch to continue my decompilation project.