[sr #110397] autoconf 2.70: autotest.m4 error

Follow-up Comment #11, sr #110397 (project autoconf):

Re. GNU m4, Apple has:

$ /usr/bin/m4 --version
GNU M4 1.4.6
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Written by Rene' Seindal.

Indeed, autoconf's configure script concludes that it has "supports accurate
traces". Do you want me to run a test to double-check?


Re. the bigger picture: automake is trying to test whether autoconf is
functional by testing it on a simple .ac file:

$ cat conftest.ac                           
AC_INIT
$ /tmp/bin/autoconf -o /dev/null conftest.ac
unknown channel m4trace: -1- _m4_warn(syntax, AC_OUTPUT was never used, )
 at /tmp/share/autoconf/Autom4te/Channels.pm line 631.
	Autom4te::Channels::msg("m4trace: -1- _m4_warn(syntax, AC_OUTPUT was never
used, )\x{a}", undef, undef, "partial", 0) called at /tmp/bin/autom4te line
1073

This content of conftest.ac is exactly what is being tested by configure, with
those exact options. I don't understand the "unknown channel m4trace" part,
but "AC_OUTPUT was never used" seems clear enough. The doc for AC_OUTPUT
states: "This is the only required macro besides AC_INIT".

Should, shouldn't automake simply include AC_OUTPUT in its simple test? I
mean, if I add it as a second line of conftest.ac, the test definitely passes.

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