Re: undefined reference to `pcre_jit_exec'

From: Jeff King <peff@peff.net>
Date: Oct 12, 2017, 20:10 UTC
Message-ID: <20171012201023.wrfbs7p7lups5glz@sigill.intra.peff.net>
In-Reply-To: <CAH8yC8mvG3bSpgshHay7B0SSyAafWLrPTtVZRuq2cShn9xQ9JA@mail.gmail.com>

On Thu, Oct 12, 2017 at 04:06:11PM -0400, Jeffrey Walton wrote:

Show 15 quoted lines

> I have a script to build Git on some old platforms to ease testing.
> Old platforms include CentOS 5. The script is available at
> https://github.com/noloader/Build-Scripts/blob/master/build-ssh.sh.
> 
> It looks like something got knocked loose recently. I'm seeing several
> of these when building with PCRE 8.41 with Git 2.14.2. Old and new
> platforms are witnessing it. I observe it on CentOS 5 with GCC 4.1;
> and Fedora 26 with GCC 7.2.
> 
>     ...
>     LINK git-credential-store
> libgit.a(grep.o): In function `pcre1match':
> grep.c:(.text+0x1219): undefined reference to `pcre_jit_exec'
> collect2: error: ld returned 1 exit status
> make: *** [Makefile:2145: git-credential-store] Error 1

Maybe:

  $ git grep -h -B5 -A1 pcre_jit Makefile
  # When using USE_LIBPCRE1, define NO_LIBPCRE1_JIT if the PCRE v1
  # library is compiled without --enable-jit. We will auto-detect
  # whether the version of the PCRE v1 library in use has JIT support at
  # all, but we unfortunately can't auto-detect whether JIT support
  # hasn't been compiled in in an otherwise JIT-supporting version. If
  # you have link-time errors about a missing `pcre_jit_exec` define
  # this, or recompile PCRE v1 with --enable-jit.

It looks like autoconf turns on USE_LIBPCRE1, but isn't smart enough to test NO_LIBPCRE1_JIT.

-Peff