Ludovic Courtès <l...@gnu.org> writes:
> Rob Browning <r...@defaultvalue.org> skribis:
>
>> $ guile-3.0 -c '(display (cond-expand (guile-2.2 "?\n")))
>> ?
>>
>> Is that intentional?
>
> I think so, though I don’t think this was discussed here.
>
> The way I see it, it means that guile-3 is a superset of 2.2.
OK, though that wasn't true for guile-2.2 with respect to 2.0? In any
case, it'd be nice to have the policy documented, perhaps on the srfi-0
info page.
At the moment, I just needed a way to write code that behaved
differently with 3.0+ as compared to 2.2, because 2.2 doesn't support
define-module #:re-export-and-replace, and there's no functional
equivalent yet.
For now I did this (I don't currently care about older than 2.2):
(define (re-export-and-replace! . names)
(cond-expand
(guile-3.0
(module-re-export! (current-module) names #:replace? #t))
(guile-2.2
(module-re-export! (current-module) names))
(else
(module-re-export! (current-module) names #:replace? #t))))
And migrated all the relevant symbols out of the define-module form.
Do we think that the norm will be for releases to cond-expand the
symbols for all their ancestors (up to some point)? i.e. guile 4 will
likely cond expand guile-3, guile-3.0, guile-3.1, ... and guile-2,
guile-2.2, and so on?
Thanks
--
Rob Browning
rlb @defaultvalue.org and @debian.org
GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A
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