can't bootstrap bison

[Bruno Haible]

Hi,

I have an old bison checkout, without modifications. Now updated it
using "git pull", then ran
  $ ./bootstrap

The run ends with

  Don't forget to
    - "include gnulib.mk" from within "lib/Makefile.am",
    - add "gnulib-po/Makefile.in" to AC_CONFIG_FILES in ./configure.ac,
    - mention "gnulib-po" in SUBDIRS in Makefile.am,
    - mention "-I m4" in ACLOCAL_AMFLAGS in Makefile.am,
    - mention "m4/gnulib-cache.m4" in EXTRA_DIST in Makefile.am,
    - invoke gl_EARLY in ./configure.ac, right after AC_PROG_CC_STDC,
    - invoke gl_INIT in ./configure.ac.
  prefix=lib/
  ./bootstrap: some git submodules are not initialized.  Run 'git submodule 
init' and bootstrap again.

So I do this:

  $ git submodule init
  $ ./bootstrap
  ...
  ./bootstrap: some git submodules are not initialized.  Run 'git submodule 
init' and bootstrap again.
  $ echo $?
  1
  $ git status
  On branch master
  Your branch is up-to-date with 'origin/master'.
  nothing to commit, working directory clean
  $ git submodule
   d279bc6d9f9323e19ad8c32b6d12ff96dfb0f5ba gnulib (v0.1-3322-gd279bc6)
  -babc8660d5a7561ed7e99e09aeabffaccfe06d6d submodules/autoconf

I'm stuck here.

There was a similar report about GNUTLS here:
https://lists.gnu.org/archive/html/bug-gnulib/2019-03/msg00001.html

The cause is probably in gnulib:
https://lists.gnu.org/archive/html/bug-gnulib/2019-01/msg00000.html

Bruno