[crosstool-ng/crosstool-ng] 7a94c8: Rework configure logic wrt GNU autotools

[Alexey Neyman <stilor at att dot net>]

  Branch: refs/heads/master
  Home:   https://github.com/crosstool-ng/crosstool-ng
  Commit: 7a94c81e5bf171d1258aa60438482fd44e5f9800
      https://github.com/crosstool-ng/crosstool-ng/commit/7a94c81e5bf171d1258aa60438482fd44e5f9800
  Author: Alexey Neyman <stilor@att.net>
  Date:   2017-01-27 (Fri, 27 Jan 2017)

  Changed paths:
    M Makefile.in
    M config/companion_tools.in
    M config/companion_tools/autoconf.in
    M config/companion_tools/automake.in
    M config/companion_tools/libtool.in
    M config/companion_tools/m4.in
    M config/companion_tools/make.in
    M configure.ac
    M scripts/build/companion_tools.sh

  Log Message:
  -----------
  Rework configure logic wrt GNU autotools

Rather than requiring them of a certain version, detect if they are present
(and have sufficient version) and select an appropriate companion tool
otherwise. The reason is that, for example, most recent gettext requires
automake 1.15, but the newest available CentOS has 1.13. Hence, the option
to "upgrade your system" does not apply, and the warning comment above
the companion tools is rather scary.

With this approach, it will work out of the box - either by using the host's
tools, or by building them as needed. Note that the user can still change
the setting in the config.

While there, propagate the new version checking macro to awk/bash/host binutils,
and switch from --with-foo=xxx to officially blessed FOO=xxx: the latter
does not require checking for bogus values (i.e., --with-foo, --without-foo)
and AC_PROG_* macros recognize the corresponding settings without further
modifications. For now, I kept --with-foo=, if only to complain and steer
people to the new way. To be cleaned up after a release.

Signed-off-by: Alexey Neyman <stilor@att.net>


  Commit: 5b084c005b2669340594adeb2bf10a0d8a0fe623
      https://github.com/crosstool-ng/crosstool-ng/commit/5b084c005b2669340594adeb2bf10a0d8a0fe623
  Author: Alexey Neyman <stilor@att.net>
  Date:   2017-01-28 (Sat, 28 Jan 2017)

  Changed paths:
    M Makefile.in
    M config/companion_tools.in
    M config/companion_tools/autoconf.in
    M config/companion_tools/automake.in
    M config/companion_tools/libtool.in
    M config/companion_tools/m4.in
    M config/companion_tools/make.in
    M configure.ac
    M scripts/build/companion_tools.sh

  Log Message:
  -----------
  Merge pull request #564 from stilor/comptools-default-to-y-if-missing

Rework configure logic wrt GNU autotools


Compare: https://github.com/crosstool-ng/crosstool-ng/compare/d0682f9ad549...5b084c005b26