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Date: Thu, 6 Oct 2016 23:42:01 +0100
From: Ramsay Jones <>
To: Ævar Arnfjörð Bjarmason <>,
 Johannes Schindelin <>
Cc: Rich Felker <>, Jeff King <>,
 Git <>,
Subject: Re: Regression: git no longer works with musl libc's regex impl

On 06/10/16 20:18, Ævar Arnfjörð Bjarmason wrote:
> On Tue, Oct 4, 2016 at 6:08 PM, Johannes Schindelin
> <> wrote:
>> As to making NO_REGEX conditional on REG_STARTEND: you are talking about
>> apples and oranges here. NO_REGEX is a Makefile flag, while REG_STARTEND
>> is a C preprocessor macro.
>> Unless you can convince the rest of the Git developers (you would not
>> convince me) to simulate autoconf by compiling an executable every time
>> `make` is run, to determine whether REG_STARTEND is defined, this is a
>> no-go.
> But just to clarify, does anyone have any objection to making our
> compile a C program to check for this sort of thing?
> Because that seems like the easiest solution to this class of problem.

Err, you do know that we already do that, right?

[see commit a1e3b669 ("autoconf: don't use platform regex if it lacks REG_STARTEND", 17-08-2010)]

In fact, if you run the auto tools on cygwin, you get a different setting
for NO_REGEX than via config.mak.uname. Which is why I don't run configure
on cygwin. :-D

[The issue is exposed by, where the cygwin native
regex library matches '.' in a pattern with the NUL character. ie the
test_expect_failure test passes.]

Ramsay Jones

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