libtool-2.4.2 is fine but libtool-2.4.6 very slow.

[Hiroyuki Sato]

Hello.

This configure.ac is extreme slow on libtool-2.4.6.
But It run smoothly on libtool-2.4.2.
https://github.com/groonga/groonga/blob/master/configure.ac

Could you tell me how to fix this problem?.
Is this libtool's Bug?

* OS OSX 10.10.5. and CentOS7

Thanks.



libtool-2.4.6

  time /tmp/libtool246/bin/libtoolize --verbose --copy --force
  libtoolize: found 'configure.ac'
  libtoolize: export M4='/usr/bin/gm4'

  It takes around 10 minutes.

libtool-2.4.2

  time /tmp/libtool242/bin/libtoolize --verbose --copy --force
  libtoolize: rm -f './ltmain.sh'
  libtoolize: putting auxiliary files in `.'.
  libtoolize: copying file from `/tmp/libtool242/share/libtool/config/ltmain.sh'
  libtoolize: rm -f './libtool.m4'
  libtoolize: rm -f './ltoptions.m4'
  libtoolize: rm -f './ltsugar.m4'
  libtoolize: rm -f './ltversion.m4'
  libtoolize: rm -f './lt~obsolete.m4'
  libtoolize: Not copying `./argz.m4', libltdl not used.
  libtoolize: putting macros in `.'.
  libtoolize: copying file from `/tmp/libtool242/share/aclocal/libtool.m4'
  libtoolize: Not copying `./ltdl.m4', libltdl not used.
  libtoolize: copying file from `/tmp/libtool242/share/aclocal/ltoptions.m4'
  libtoolize: copying file from `/tmp/libtool242/share/aclocal/ltsugar.m4'
  libtoolize: copying file from `/tmp/libtool242/share/aclocal/ltversion.m4'
  libtoolize: copying file from `/tmp/libtool242/share/aclocal/lt~obsolete.m4'
  libtoolize: Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
  libtoolize: rerunning libtoolize, to keep the correct libtool macros in-tree.

  real 0m1.003s
  user 0m0.364s
  sys 0m0.540s


-- 
Hiroyuki Sato