Re: Test failures when Git is built with libpcre and grep is built without it

["A. Wilcox" <awilfox@adelielinux.org>]

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(Hi, musl developers!  Read on for some information regarding what
began as a test failure during packaging of Git 2.7.3 that appears to
be related to musl's regexp library.)


On 09/01/17 05:27, Jeff King wrote:
> Are you trying with a version of git older than v2.7.x?


We are using 2.7.3.  I will admit the version is a bit old, but it is
working on all other arches (and it took an inordinate amount of time
to spin up PowerPC - hooray for toolchain issues).


On 09/01/17 15:33, Jeff King wrote:
> On Mon, Jan 09, 2017 at 02:05:44PM +0100, Andreas Schwab wrote:
>> You need to quote the regexp argument, see the line starting
>> with "test_must_fail" above.
> 
> Oh, duh. I checked that the line in the test was quoted


Guilty of this as well.  Sorry about that.  With the proper
invocation, I receive a success:


elaine trash directory.t7810-grep # git grep -G -F -P -E
"a\x{2b}b\x{2a}c" ab
error: cannot run less: No such file or directory
ab:a+b*c
elaine trash directory.t7810-grep # echo $?
0


Haven't managed to build less(1) for PowerPC yet, but it does seem to
work when quoted.  Yikes!


> The problem is that we are expecting the regex "\x{2b}" to complain
> in regcomp() (as an ERE), but it doesn't. And that probably _is_
> related to musl, which is providing the libc regex (I know this
> looks like a pcre test, but it's checking that "-P -E" overrides
> the pcre option with "-E").
> 
> I'm not sure if musl is wrong for failing to complain about a
> bogus regex. Generally making something that would break into
> something that works is an OK way to extend the standard. So our
> test is at fault for assuming that the regex will fail. I guess
> we'd need to find some more exotic syntax that pcre supports, but
> that ERE doesn't. Maybe "(?:)" or something.
> 
> -Peff
> 


I am cc:ing in the musl development list to see what their thoughts are.

Thanks for the help so far; I really appreciate it.  Hopefully we can
resolve this in a way that makes musl and Git's test suite both more
correct, if necessary.

Happy new year!

- --arw


- -- 
A. Wilcox (awilfox)
Project Lead, Adélie Linux
http://adelielinux.org
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