AC_INIT regression in 2.69c

[Jani Välimaa]

Hello,

autoreconf seems to be failing with autoconf-2.69c with the following
AC_INIT in configure.ac.

AC_INIT([test],
        [m4_esyscmd([build-aux/git-version-gen .tarball-version])],
        [bug-autoconf@gnu.org])

Same happens also with other m4_* macros wrapped with [].

Easiest test case can be found from autoconf itself. Current git master
doesn't have m4_esyscmd wrapped to [], but if one adds [], autoreconf
fails.

configure.ac:23: error: possibly undefined macro: m4_esyscmd
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
autoreconf: error: /usr/bin/autoconf failed with exit status: 1

pgpi5PE8GpgFX.pgp
Description: OpenPGP-allekirjoitus