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Moving to Autoconf 2.64, Automake 1.11

Hello everyone,

I will reply to this message with a number of patches that contain the
heart of the switch to newer autotools.  They apply in the order posted,
and each successive version is expected to work, or at least only break
minor bits such as provoking an automake warning about duplicate
install-pdf, but my plan is to get them all approved and then apply them
in short succession.  (Splitting them by topic is really helpful to
maintain sanity, and be able to distinguish generated from manual
changes.) For committing the series, would it be ok to then ask for a
couple of hours in which no changes to the build system are made?

- Update automake-provided helper scripts in the toplevel,
- LIBTOOLFLAGS, and *_LINK fixes for Automake 1.11 (GCC only),
- some minor fixes in sim, gold, gdb (src only)
- Bump Autoconf version to 2.64 in override.m4, and regenerate the
  world with 2.64 and Automake 1.11,
- remove {all,install}-{html,pdf} and {dataroot,doc,pdf,html}dir stuff
  not needed any more, update documentation bits throughout the tree.

Apart from that, I would need somebody to update the autotools tarballs
at for me, at the time I am
committing the above.  The upstream tarballs are available here:

I have done a bunch of testing of the resulting trees, mostly native
bootstraps+regtests however (no regressions).  I think I have addressed
all issues that cropped up and that have been documented before on this
list.  Notably, however, I have not done a --with-build-sysroot test; I
would like to ask someone else to do this for me.  I do have good reason
to believe that the issue reportd in
<> is fixed in
my patch series, though: the very likely reason for the above was that
the *_LDFLAGS/*_LINK semantic change was not addressed.

The texinfo changes have been tested with 'make info pdf html'.

To make it easy for whoever volunteers for the --with-build-sysroot
test, I would like to ask for this to be done after I commit the patch
set.  OK?

Note that I do expect one or two more things that could break some
specific build setups; I don't think it is feasible to test them all in
advance, but I will try to look at them in a short order then.

This patch series can be extended with two more helpful changes that
are not time-critical:

- bump all the AC_PREREQ's to 2.64, add 1.11 to AUTOMAKE_OPTIONS or
  AM_INIT_AUTOMAKE calls as requirement, to avoid accidental use of old
  tools.  The config/override.m4 bit ought to prevent the error for
  Autoconf already, unless other weird issues come into play, too, such
  as also inadvertently dropping some aclocal -I ../config options or
  so.  (My thinking here was that, as some parts of the tree are shared
  with external projects, they don't need to upgrade their autotools
  usage right at the same time.)

- fix the (new with Autoconf 2.64) warnings from configure about unknown
  --enable/--with switches.  I would appreciate some input on whether
  this functionality should just be turned off with
  AC_DISABLE_OPTION_CHECKING, or we should add some logic to the
  toplevel configure script to be more intelligent about it.

Thanks for all the review work done so far!

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