Re: [gentoo-dev] Preventing $ARCH flags in USE

[Zac Medico <zmedico@gentoo.org>]

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Santiago M. Mola wrote:
> On Mon, Sep 15, 2008 at 9:45 PM, Vlastimil Babka <caster@gentoo.org> wrote:
>> I think it's better to prevent this rather than waste time with bug
>> reports like that. I asked Zac on IRC whether portage could filter such
>> flags. He suggested using use.mask in profiles. Well since ARCH is also
>> set by a profile, why not. Although a really persistent and stupid user
>> could use.unmask, it's better than no protection. And then we can think
>> how to replace the current ARCH->USE flag system with e.g. USE_EXPAND.
>> What do you think?
>>
> 
> Seems like an acceptable workaround.
> 
> For future EAPIs, ARCH could be a regular USE_EXPANDed flag as you
> suggest, and package managers could filter any flag in USE which is
> not listed in IUSE.

I suspect that it may be a little more than a "workaround". Consider
a case where IUSE contains elibc_glibc and the current selected
profile has set ELIBC=uclibc. In this case, the user could
conceivable set USE=elibc_glibc in make.conf, which would clearly be
an invalid setting. Therefore, it seems natural to mask the
elibc_glibc USE flag on all profiles except those which actually use
glibc.

- --
Thanks,
Zac
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