Re: [gentoo-portage-dev] [RFC] Mask packages that don't cross-compile

[Marius Mauch]

On Wed, 22 Nov 2006 03:10:45 -0500 (EST)
Daniel Barkalow <barkalow@××××××××.org> wrote:

> There are packages (such as perl) which work fine on both x86 and arm,
> but don't build on x86 cross-compiling for arm. Furthermore, pam-0.78 can
> be cross-compiled (with a patch available in bug comments), but pam-0.99
> will require more work to get to cross-compile. It would be useful to be
> able to have 0.99 use a keyword (or something) such that it is excluded
> from cross-compiles and these builds get 0.78 instead.
>
> I've got a working patch that extends the KEYWORDS semantics slightly,
> such that, if KEYWORDS includes -foo, and ACCEPT_KEYWORDS includes foo but
> not -foo, the package is masked, even if KEYWORDS also includes bar and
> ACCEPT_KEYWORDS also includes bar.
>
> Then you can have the ACCEPT_KEYWORDS value "$ARCH cross" and packages
> with KEYWORDS including "-cross" will be masked, unless you have "-cross"
> in packages.keywords.
>
> This probably horribly mangles the concept of KEYWORDS, but I can't really
> tell from reading the documentation that it doesn't work this way. (Of
> course, I know it doesn't from trying things and reading the source,
> but...) It doesn't specify whether "foo" or "-bar" on a package takes
> precedence if "foo" and "bar" both apply to the system. (Of course, it
> does say that keywords are always ARCHes, which would imply that only one
> could apply.) I think this all works as expected, however, except that a
> package having "cross" means that it is known to automatically work if
> you're cross-compiling, rather than simply meaning that it is known
> to work if you're cross-compiling and it would work if you were building
> natively on your target.

No. -foo is reserved for incremental negation. Maybe that isn't widely used in ACCEPT_KEYWORDS, but it has valid uses there and there can't be repurposed. Is there a particular reason why you don't use the normal keyword logic (KEYWORDS=cross and setting -cross in p.keywords to mask a package), or simply a package.mask entry?

Marius
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