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From: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
To: Jeff King <peff@peff.net>
Cc: Jeffrey Walton <noloader@gmail.com>, Git List <git@vger.kernel.org>
Subject: Re: undefined reference to `pcre_jit_exec'
Date: Thu, 12 Oct 2017 23:05:06 +0200
Message-ID: <874lr46prx.fsf@evledraar.booking.com> (raw)
In-Reply-To: <20171012203832.ui52j7cdrztc6vhs@sigill.intra.peff.net>


On Thu, Oct 12 2017, Jeff King jotted:

> On Thu, Oct 12, 2017 at 04:34:38PM -0400, Jeffrey Walton wrote:
>
>> > It looks like autoconf turns on USE_LIBPCRE1, but isn't smart enough to
>> > test NO_LIBPCRE1_JIT.
>>
>> If Git wants Jit, then I am inclined to configure PCRE to provide it.
>
> It does make things faster. OTOH, we lived for many years without it, so
> certainly it's not the end of the world to build without it.
>
> There are some numbers in the commit message of fbaceaac47 (grep: add
> support for the PCRE v1 JIT API, 2017-05-25).
>
>> A quick question if you happen to know... Does PCRE Jit cause a loss
>> of NX-stacks? If it causes a loss of NX-stacks, then I think I prefer
>> to disable it.
>
> I don't know. Ævar (cc'd) might.

Sorry, no idea. I do see some references to that in sljit (which pcre
JIT uses), but haven't tried this myself. From what I understand of how
NX works it should fail really fast if it doesn't, so it would be cool
if you could try it and report if it works.

      parent reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-12 20:06 Jeffrey Walton
2017-10-12 20:10 ` Jeff King
2017-10-12 20:34   ` Jeffrey Walton
2017-10-12 20:38     ` Jeff King
2017-10-12 21:00       ` Jeffrey Walton
2017-10-12 21:05       ` Ævar Arnfjörð Bjarmason [this message]

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