Re: [PATCH] Makefile: promote wildmatch to be the default fnmatch implementation

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On Thu, May 30, 2013 at 9:25 AM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Nguyễn Thái Ngọc Duy  <pclouds@xxxxxxxxx> writes:
>
>> This makes git use wildmatch by default for all fnmatch() calls. Users
>> who want to use system fnmatch (or compat fnmatch) need to set
>> NO_WILDMATCH flag.
>>
>> wildmatch is a drop-in fnmatch replacement with more features. Using
>> wildmatch gives us a consistent behavior across platforms.
>
> While I agree this is a good move in the longer term in that we get
> the often-asked-for "foo/**/*.c" match and also we have one less
> platform differences to worry about, I somehow have a recollection
> that we discussed that there are incompatibilities in dark corners
> we would want to warn users about and lay a transition plan across
> some major version bump.

I've skimmed through all wildmatch related mails in my gmail archive.
There are differences between fnmatch versions, e.g. [1], but I don't
think anyone would run into those cases on purpose. There were
performance concerns [2] and they should have been addressed with
nd/retire-fnmatch series. Originally I was worried that this new code
might not be mature enough, but I've been running wildmatch-only git
for quite some time, can't really complain.

Not really a transition plan, but maybe we could provide a runtime
switch to return to system fnmatch when wildmatch becomes default, for
a few cycles. This way if wildmatch turns out broken, people can
switch back while we work on a fix.

> Hmph, could you (no need to hurry, though) check the previous
> discussion and point at what we decided if we did reach any
> conclusion to refresh our collective memory?

We all seemed to agree that the replacement would be a way to go. But
not hard decision was reached.

[1] http://thread.gmane.org/gmane.comp.version-control.git/207385/focus=207540
[2] http://thread.gmane.org/gmane.comp.version-control.git/211823/focus=211836
--
Duy
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