Re: [gentoo-devhelp] Mutually exclusive USE flags

[Mike Frysinger]

On Saturday 30 January 2010 18:31:35 Nikos Chantziaras wrote:
> What's the best way to have an ebuild abort if two mutually exclusive
> USE flags are both set?
>
> I'm trying the modify the mozilla-firefox and xulrunner ebuilds to
> support building with OSS instead of ALSA (sadly, the current versions
> of the ebuilds in Portage only allow ALSA to be enabled, not OSS), but
> the build system of Xulrunner/Firefox does not allow to build with both.
> So I need to abort when both "alsa" and "oss" are set rather than having
> the build proceed and the user getting a compilation error later on.

put a check into pkg_setup() that does ewarn's on conflicting USE flags, and 
then have the rest of the ebuild pick a sensible default.  in the case of oss 
vs alsa, the latter would be the sensible default.
-mike