http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48950
--- Comment #7 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> 2011-05-10 19:23:57 UTC --- 4.5 may be a test version as far as Cygwin folks downstream of us, but 4.5 and 4.6 are "Released" and perfectly useable from our view from here. Both are better than any of the older versions as far as we know. (ie many bugs fixed since) I hope that you can upgarde to a more current version.
