* autoheader.sh: No longer try to select the needed paragraphs of
`acconfig.h', just dump everything into `config.h.in'.
Implement support for `--warnings'.
Warn the users that these auxiliary files are obsolete when `-W
obsolete'.
* doc/autoconf.texi (Invoking autoheader): Adjust.
Reported by Jim Meyering.
* autoheader.sh: Trace AC_DEFINE and AC_DEFINE_UNQUOTED to build
the list of $syms which are defined.
* tests/tools.m4 (autoheader): New test.
From Jim Meyering.
* autoheader.sh (usage): The usage is to use $0 here.
(ah_base): Be in TMPDIR.
Install the `trap' before creating the first tmp file.
Also trap on 0.
Require GNU m4 1.4 (well 1.3 in fact).
Because we are ready to handle the case where there are no frozen
files, we *have* to pass a -I, which is dangerous in conjunction
with the silent including of `aclocal.m4': you may include things
that were not expected. Since anyway handling pre 1.3 complicates
the task, just require an m4 which supports reloading of frozen
files.
* acspecific.m4 (AC_PROG_GNU_M4): Check for --reload.
* autoconf.sh: Likewise
* autoheader.sh: Likewise.
* configure.in: Explicitly state the m4 version you want.
