Systems with old regex system headers/libraries don't pick up git's compat/regex header file

[Richard Lloyd <richard.lloyd@connectinternetsolutions.com>]

git ships with a compat/regex tree containing a recent regex
release, presumably with the intention of allowing systems with
either no regex or an old regex installed to use the newer compat
version.

With the release of git-2.10.1, the use of a recent regex
is now specifically checked in git-compat-util.h via a
#ifndef REG_STARTEND check at line 979.

Unfortunately, on systems with an older regex shipped as
standard (e.g. HP-UX 11), the include path picks up
/usr/include/regex.h first, which doesn't define REG_STARTEND
and the git-compat-util.h check fails.

The fix I applied on HP-UX 11 was to add -Icompat/regex
to the CFLAGS ahead of other -I directives. Another possible
change needed might be to line 69 of compat/regex/regex.c:

#include "regex.h"

This is to ensure that /usr/include/regex.h isn't picked up
(since git ships its own regex.h in the compat/regex
dir, it probably shouldn't #include <regex.h> anyway,
which risks picking up an incompatible regex.h).

Richard K. Lloyd,           E-mail: richard.lloyd@connectinternetsolutions.com
Connect Internet Solutions,    WWW: https://www.connectinternetsolutions.com/
4th Floor, New Barratt House,
47, North John Street,
Liverpool,
Merseyside, UK. L2 6SG



-- 
This e-mail (and any attachments) is private and confidential. If you have 
received it in error, please notify the sender immediately and delete it 
from your system. Do not use, copy or disclose the information in any way 
nor act in reliance on it.

Any views expressed in this message are those of the individual sender,
except where the sender specifically states them to be the views of Connect
Internet Solutions Ltd. This e-mail and any attachments are believed to be
virus free but it is the recipient's responsibility to ensure that they are.

Connect Internet Solutions Ltd
(A company registered in England No: 04424350)
Registered Office: 4th Floor, New Barratt House, 47 North John Street,
Liverpool, L2 6SG
Telephone: +44 (0) 151 282 4321
VAT registration number: 758 2838 85