CVS log for src/usr.bin/m4/extern.h

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Pull up following revision(s) (requested by uwe in ticket #981):

	usr.bin/m4/m4.1: revision 1.28
	usr.bin/m4/m4.1: revision 1.29
	usr.bin/m4/extern.h: revision 1.20
	usr.bin/m4/main.c: revision 1.49
	usr.bin/m4/m4.1: revision 1.30
	usr.bin/m4/trace.c: revision 1.9
	usr.bin/m4/main.c: revision 1.50

Try not to lose error output with --error-output.

Try to avoid the trap we set up ourselves while avoiding freopen(3).
When exit flushes and closes open streams it may close sfp first and
when it comes about to flush and close stderr, the descriptor is
already gone and we lose any buffered error output.  This actually
happens on some hosts, breaking --trace output used by autoconf.

Fix --error-output to be more like GNU m4.

GNU m4 --error-output is the same as -o despite the name.  It does NOT
affect warnings, error messages, and 'errprint' output so drop the
misguided bit of code that tried to freopen stderr without closing it
on failure.  Drop -e (which was our local invention) and make merge
--error-output with -o so that both set traceout.  Make trace_file()
preserve the old traceout on error and return error status so that the
caller can emit appropriate warning.

Do not yet support disabling tracing with an empty name, the rest of
the code is not ready, we don't do -o positionally and we don't have
`debugfile'.

Fix --error-output to be more like GNU m4.  It's a long version of -o.

Bump date for previous.

Use a date that is actually a real date.

Fix --error-output to be more like GNU m4.

GNU m4 --error-output is the same as -o despite the name.  It does NOT
affect warnings, error messages, and 'errprint' output so drop the
misguided bit of code that tried to freopen stderr without closing it
on failure.  Drop -e (which was our local invention) and make merge
--error-output with -o so that both set traceout.  Make trace_file()
preserve the old traceout on error and return error status so that the
caller can emit appropriate warning.

Do not yet support disabling tracing with an empty name, the rest of
the code is not ready, we don't do -o positionally and we don't have
`debugfile'.

add nesting_limit

- declarations for real/fake freeze
- add new flags

delete extern

sync with head

Add __printflike attribution to use vprintf and friends with an argument
as format string.

Move usage and onintr to make them static. Add __dead as needed.

fix prototype

resolve conflicts.

Import new m4 from OpenBSD.

Overhaul how `build.sh tools' are used:

    *	Rename "config.h" to "nbtool_config.h" and
	HAVE_CONFIG_H to HAVE_NBTOOL_CONFIG_H.
	This makes in more obvious in the source when we're using
	tools/compat/config.h versus "standard autoconf" config.h

    *	Consistently move the inclusion of nbtool_config.h to before
    	<sys/cdefs.h> so that the former can provide __RCSID() (et al),
    	and there's no need to protect those macros any more.

These changes should make it easier to "tool-ify" a program by adding:
	#if HAVE_NBTOOL_CONFIG_H
	#include "nbtool_config.h"
	#endif
to the top of the source files (for the general case).

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

Roll in fixes to permit cross-compiling from non-NetBSD hosts.  This
round has been tested on Solaris/x86 and Linux hosts.

* Add host tools cap_mkdb, ctags, m4, uudecode.
* Protect __RCSID() and __COPYRIGHT() better.
* Reduce the number of places that need to include "config.h", to keep
  sources closer to their "vanilla" versions.
* Add more compat #defines and autoconf-checked functions.

Make compilable from src/tools/m4 on non-NetBSD hosts.

Get first getopt string right; provide better usage message.

Pull in various changes from OpenBSD, most from Marc Espie, including:
* Provide some GNUisms as extensions.
* Provide dynamically growable string space.
* Make define(defn(foo)) work correctly for builtins.
(The current version is supposed to be capable of satisfying autoconf.)

All still relevant NetBSD changes have been preserved in this version, and
formatting and style fixes have been applied in various places.

Thanks to Masao Uebayashi <uebayasi@soum.co.jp> for pointing this out.

Pull up 1.5 and 1.6

fix an inconsistency between signed- and unsigned-char machines:
make sure that pushed-back 0xff character isn't accidentally
interpreted as an EOF because of sign extension when chars were being
assigned to pbents.  (signed-char machines lost.)  To do this, make
putback() and pbstr() operate only on unsigned chars, and add a
putbackeof() function to do the obvious thing when necessary.

add a typedef which describes elements in the push-back buffer.  Make
that typedef 'short'.  'char' (which was previously used) because char
may be unsigned and ((char)EOF) != EOF if that is the case.  That was
causing the (char)EOF (0xff) pushed back in main to be interepreted as
a character, and, in some cases, to be written to the output.  'short'
was used rather than 'signed char' because if the latter is used,
0xff characters in the input would confuse m4.  (No point in introducing
(more?) 8-bit lossage.)

WARNSify, fix .Nm usage, getopt returns -1 not EOF, deprecate register

Handle multichar comment and quote delimiters (up to 5 characters, per the
manual page). Takes care of PR#485.

Sync with 4.4BSD-Lite2

imported from 44lite2

upgrade to 4.4-lite m4.  no local changes of note