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Marius Mauch wrote:
>>> "Marijn Schouten (hkBst)" <[EMAIL PROTECTED]>:
>>>> I imagine there are a lot more cases where the simple on/off
>>>> system we have now is suboptimal. I could be wrong of course.
>>>> Please comment.
>>> This key=value systems sounds interesting. Another use could be
>>> the choice between xulrunner, seamonkey, firefox.
>
> We already have this with USE_EXPAND. Not exactly the same syntax, but
> I don't see a terrible problem in that, and we don't have to fix all
> three trillion related tools to handle it. Unless you can come up
> with a case that can't be handled with USE_EXPAND.
No, USE_EXPAND is only a way to abbreviate use flags with a common substring
in their name, such as "impl_guile impl_sbcl impl_clisp" which could be
encoded interchangeably as either
# without USE_EXPAND
IUSE="impl_guile impl_sbcl impl_clisp"
or
# with USE_EXPAND
for impl in IMPL; do IUSE+="impl_${impl}"; done
but the effect is that there are 3 use flags with a total of 2^3=8
combinations, while really something with exactly 3 combinations is needed:
IUSE="impl"
case ${impl} in
guile) #use guile as backend
sbcl) #use sbcl as backend
clisp) #use clisp as backend
or something like that.
Marijn
- --
Marijn Schouten (hkBst), Gentoo Lisp project
<http://www.gentoo.org/proj/en/lisp/>, #gentoo-lisp on FreeNode
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