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Re: [platform-testers] bug#21755: new snapshot available: grep-2.21.82-f

From: Bruce Dubbs
Subject: Re: [platform-testers] bug#21755: new snapshot available: grep-2.21.82-fbc5
Date: Sun, 25 Oct 2015 17:19:26 -0500
User-agent: Mozilla/5.0 (X11; Linux i686; rv:35.0) Gecko/20100101 Firefox/35.0 SeaMonkey/2.32

Jim Meyering wrote:

Thanks for testing.
However, that failure probably indicates that you are running
a binary that uses an older version of libpcre.  Compare the results
of these commands on a Centos6 system:

   $ gcc print-pcre-version.c -lpcre; ./a.out
   7.8 2008-09-05
   $ gcc print-pcre-version.c $(pcre-config --libs) \
     -Wl,-rpath -Wl,$(pcre-config --prefix)/lib && ./a.out
   8.37 2015-04-28
   $ cat print-pcre-version.c
   #include <stdio.h>
   char *pcre_version(void);
   main ()
     puts (pcre_version());
     return 0;

Thanks Jim,

I get:

$ gcc print-pcre-version.c -lpcre; ./a.out
8.37 2015-04-28

6 months old does not seem like an 'older' version to me. Actually pcre2-10.10 is older than that. There is one more recent version of pcre2-10.20 as of July 2nd.

I.e., if I don't take special measures, I end up using the much
older system-provided version than the one that I installed to
work around this problem.

I too saw the symptom of a segfault in "match", before I
switched to building with these options:

   make AM_CFLAGS="$(pcre-config --cflags)" AM_LDFLAGS="$(pcre-config
--libs) -Wl,-rpath -Wl,$(pcre-config --prefix)/lib"

I'm not sure what advantage those switches would give.  I have

pcre-config --cflags = (null)
pcre-config --libs   = -lpcre
pcre-config --prefix = /usr

So that line would translate to:

make AM_CFLAGS= AM_LDFLAGS=-lpcre -Wl,-rpath -Wl,/usr/lib

which, if I'm not mistaken, is what the default would be without any options being passed to make.

The issue appears to be that there is a different pcre2 used by some distros. I would think that the tests in grep should account for both pcre and pcre2, at least for a couple of years.

  -- Bruce

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