http://bugs.winehq.org/show_bug.cgi?id=22890
--- Comment #10 from Philip J. Fry dabljuh@dabserver.dyndns.org 2010-05-30 16:44:06 --- Richard, I cannot reproduce that, I tested this extensively, strip-flags (which is what's run in the 1.1.44 ebuild when you have the custom-cflags USE flag disabled) removes -fomit-frame-pointer for me on Portage 2.2_rc63.
Review the strip-flags function and the setup-allowed-flags functions in /usr/portage/eclass/flag-o-matic.eclass