1 GNU M4 NEWS - User visible changes.
3 * Noteworthy changes in release 1.4.16 (2011-03-01) [stable]
5 ** Fix regressions in the `index' builtin. On glibc platforms, this
6 avoids false positives from a strstr bug in glibc 2.9 through 2.12;
7 on many other platforms, it fixes two separate regressions, a false
8 positive introduced in 1.4.11 and a false negative in 1.4.15.
10 ** A number of portability improvements inherited from gnulib.
13 * Noteworthy changes in release 1.4.15 (2010-08-31) [stable]
15 ** Fix regression introduced in 1.4.9b where the `format' builtin could
16 crash on an invalid format string.
18 ** Fix compilation against newer glibc, and on AIX 7.1BETA.
20 ** A number of portability improvements inherited from gnulib.
23 * Noteworthy changes in Version 1.4.14 (2010-02-24) [stable]
24 Released by Eric Blake, based on git version 1.4.13.*
26 ** Fix regression introduced in 1.4.12 where executing with stdout closed
27 could crash m4 on exit on some platforms.
29 ** Fix regressions introduced in 1.4.13 in the `esyscmd' builtin, where
30 closed file descriptors could interfere with child execution, and where
31 a child status of 127 made m4 print a spurious message to stderr.
33 ** Fix a security hole in 'make dist', present since at least M4 1.4, that
34 could affect anybody attempting to redistribute modified sources (see
35 Automake CVE-2009-4029).
37 ** A number of portability improvements inherited from gnulib.
39 * Noteworthy changes in Version 1.4.13 (2009-04-01) [stable]
40 Released by Eric Blake, based on git version 1.4.12.*
42 ** The manual is now distributed under the terms of FDL 1.3.
44 ** The `divert' and `undivert' builtins have been made more efficient
45 when using temporary files for large diversions.
47 ** The `translit' builtin has been made more efficient when the second
50 ** The input engine has been optimized for faster processing.
52 ** The command line option `--debugfile', introduced in 1.4.7, now
53 treats its argument as optional, in order to allow setting the debug
54 output back to stderr when used without an argument; and order is now
55 significant with respect to command line files. You must therefore use
56 `m4 --debugfile=trace file', not `m4 file --debugfile trace'. This
57 change does not affect the deprecated `-o'/`--error-output' option.
59 ** The `syscmd' and `esyscmd' builtins can be configured to use an
60 alternate shell, via the new `configure' option `--with-syscmd-shell'.
62 ** A number of portability improvements inherited from gnulib.
64 * Noteworthy changes in Version 1.4.12 (2008-10-10) [stable]
65 Released by Eric Blake, based on git version 1.4.11.*
67 ** Fix regression introduced in 1.4.4b where using `traceon' could delete
68 a macro. This was most noticeable with `traceon(`traceon')', but
69 would also happen in cases such as `foo(traceon(`foo'))'.
71 ** Fix regression introduced in 1.4.7 where `m4 -N9' died with an assertion
74 ** Fix regression introduced in 1.4.11 where `defn' died with an assertion
75 failure on a traced but undefined macro.
77 ** New `-g'/`--gnu' command-line option overrides `-G'/`--traditional'.
78 For now, the environment variable POSIXLY_CORRECT has no effect on M4
79 behavior; but a future release of M4 will behave as though --traditional
80 is implied if POSIXLY_CORRECT is set (this future change is necessary,
81 because in the current release, there is no way to disable GNU
82 extensions that conflict with POSIX without the use of a non-POSIX
83 command-line argument). Clients of M4 that want to use GNU extensions,
84 even when POSIXLY_CORRECT is set, should start using the -g command-line
85 argument, even though it is currently a no-op if -G did not appear
86 earlier in the command line, so that the client will not break in the
87 face of an upgraded m4 and a POSIXLY_CORRECT execution environment.
89 ** The `-L'/`--nesting-limit' command-line option now defaults to 0 for
90 unlimited on platforms that can detect and deal with stack overflow. On
91 systems that lack alternate stack support, such as Cygwin, and on
92 systems that do not obey the POSIX semantics for distinguishing stack
93 overflow from other exceptions, such as Linux, you can optionally
94 install the libsigsegv library (version 2.6 or newer recommended) to
95 enhance m4's ability to accurately report stack overflow:
96 http://www.gnu.org/software/libsigsegv/
98 ** A number of portability improvements inherited from gnulib.
100 * Noteworthy changes in Version 1.4.11 (2008-04-02) [stable]
101 Released by Eric Blake, based on git version 1.4.10a
103 ** Security fixes for the -F option, for bugs present since -F was
104 introduced in 1.3: Avoid core dump with 'm4 -F file -t undefined', and
105 avoid arbitrary code execution with certain file names.
107 ** Fix regression introduced in 1.4.9b in the `divert' builtin when more
108 than 512 kibibytes are saved in diversions on platforms like NetBSD
109 or darwin where fopen(name,"a+") seeks to the end of the file.
111 ** The output of the `maketemp' and `mkstemp' builtins is now quoted if a
112 file was created. This is a minor security fix, because it was possible
113 (although rather unlikely) that an unquoted string could match an
114 existing macro name, such that use of the `mkstemp' output would trigger
115 inadvertent macro expansion and operate on the wrong file name.
117 ** Enhance the `defn' builtin to support concatenation of multiple text
118 arguments, as required by POSIX. However, at this time, it is not
119 possible to concatenate a builtin macro with anything else; a warning is
120 now issued if this is attempted, although a future version of M4 may
121 lift this restriction to match other implementations.
123 ** Enhance the `format' builtin to parse all C99 floating point numbers,
124 even on platforms where strtod(3) is buggy, although the replacement
125 function does have the known issue of rounding errors when parsing
126 some decimal floating point values. This fixes testsuite failures
127 introduced in 1.4.9b.
129 ** Enhance the `index' builtin to guarantee linear behavior, in spite of
130 the surprisingly large number of systems with a brain-dead quadratic
133 ** A number of portability improvements inherited from gnulib.
135 * Noteworthy changes in Version 1.4.10 (2007-07-09) [stable]
136 Released by Eric Blake, based on CVS version 1.4.9c
138 ** Upgrade from GPL version 2 to GPL version 3 or later.
140 ** A number of portability improvements inherited from gnulib.
142 ** Avoid undefined behavior introduced in 1.4.9b in the `format' builtin
143 when handling %c. However, this area of code has never been documented,
144 and currently does not match the POSIX behavior of printf(1), so it may
145 have further changes in the next version.
147 * Noteworthy changes in Version 1.4.9b (2007-05-29) [beta]
148 Released by Eric Blake, based on CVS version 1.4.9a
150 ** Fix regression introduced in 1.4.9 in the `eval' builtin when performing
153 ** Fix regression introduced in 1.4.8 in the `-F' option that made it
154 impossible to freeze more than 512 kibibytes of diverted text.
156 ** The synclines option `-s' no longer generates sync lines in the middle of
157 multiline comments or quoted strings.
159 ** Work around a number of corner-case POSIX compliance bugs in various
160 broken stdio libraries. In particular, the `syscmd' builtin behaves
161 more predictably when stdin is seekable.
163 ** The `format' builtin now understands formats such as %a, %A, and %'hhd,
164 and works around a number of platform printf bugs. Furthermore, the
165 sequence format(%*.*d,-1,-1,1) no longer outputs random data. However,
166 some non-compliant platforms such as mingw still have known bugs in
167 strtod that may cause testsuite failures.
169 ** The testsuite is improved to also run gnulib portability tests for the
170 features that M4 imports from gnulib.
172 * Noteworthy changes in Version 1.4.9 (2007-03-23) [stable]
173 Released by Eric Blake, based on CVS version 1.4.8c
175 ** Minor documentation and portability cleanups.
177 * Noteworthy changes in Version 1.4.8b (2007-02-24) [beta]
178 Released by Eric Blake, based on CVS version 1.4.8a
180 ** Fix a regression introduced in 1.4.8 that made m4 unable to process
181 files larger than 2GiB on some platforms.
183 ** Fix a regression introduced in 1.4.8 that made m4 dump core when
184 invoked as 'm4 -- file'.
186 ** The `eval' builtin now follows C precedence rules. Additionally, the
187 short-circuit operators correctly short-circuit division by zero. The
188 previously undocumented alias of '=' meaning '==' in eval now triggers a
189 deprecation warning, so that a future version of M4 can implement a form
190 of variable assignment as an extension.
192 ** The `include' builtin now affects exit status on failure, as required by
193 POSIX. Use `sinclude' if you need a successful exit status.
195 ** The `-E'/`--fatal-warnings' command-line option now has two levels. When
196 specified only once, warnings affect exit status, but execution
197 continues, so that you can see all warnings instead of fixing them one
198 at a time. To achieve 1.4.8 behavior, where the first warning
199 immediately exits, specify -E twice on the command line.
201 ** A new `--warn-macro-sequence' command-line option allows detection of
202 sequences in `define' and `pushdef' definitions that match an optional
203 regular expression. The default regular expression is
204 `\$\({[^}]*}\|[0-9][0-9]+\)', corresponding to the sequences that might
205 not behave correctly when upgrading to the eventual M4 2.0. By default,
206 M4 2.0 will follow the POSIX requirement that a macro definition
207 containing `$11' must expand to the first argument concatenated with 1,
208 rather than the eleventh argument; and will take advantage of the POSIX
209 wording that allows implementations to treat `${11}' as the eleventh
210 argument instead of literal text. Be aware that Autoconf 2.61 will not
211 work with this option enabled with the default regular expression; but
212 Autoconf 2.62 will be compatible with this option.
214 ** Improved portability to platforms such as BSD/OS and AIX.
216 * Noteworthy changes in Version 1.4.8 (2006-11-20) [stable]
217 Released by Eric Blake, based on CVS version 1.4.7a
219 ** The `divert' macro and `-H'/`--hashsize' command line option no longer
220 cause a core dump when handed extra large values. Also, `divert' now
221 uses memory proportional to the number of diversions in use, rather than
222 to the maximum diversion number encountered, so that large diversion
223 numbers are less likely to exhaust system memory; and is no longer
224 limited by the maximum number of file descriptors.
226 ** The `--help' and `--version' command line options now consistently
227 override all earlier options. For example, `m4 --debugfile=trace
228 --help' now no longer accidentally creates an empty file `trace'.
230 ** The `-L'/`--nesting-limit' command line option can now be set to 0
231 to remove the default limit of 1024. However, it is still possible that
232 heavily nested input can cause abrupt program termination due to stack
235 ** Problems encountered when writing to standard error, such as with the
236 `errprint' macro, now always cause a non-zero exit status.
238 ** Warnings and errors issued during macro expansion are now consistently
239 reported at the line where the macro name was detected, rather than
240 where the close parenthesis resides. Text wrapped by `m4wrap' now
241 remembers the location that was in effect when m4wrap was invoked,
242 rather than changing to line 0 and the empty string for a file. The
243 macros `__line__' and `__file__' now work correctly even as the last
244 token in an included file.
246 ** The `builtin' and `indir' macros now transparently handle builtin
247 tokens generated by `defn'.
249 ** When diversions created by the `divert' macro collect enough text that
250 M4 must use temporary files, the environment variable $TMPDIR is now
251 consulted, and a better effort is made to clean up those files in the
252 event of a fatal signal.
254 ** The `mkstemp' builtin is added with the same GNU semantics as `maketemp',
255 based on the recommendation of POSIX to deprecate the POSIX semantics of
256 `maketemp' as inherently insecure. In GNU mode (no -G supplied on the
257 command line), `maketemp' silently retains the secure GNU semantics, but
258 a future release of M4 will change this to emit a warning. In
259 traditional mode (m4 -G), `maketemp' now uses the POSIX-mandated
260 insecure semantics, and issues a warning that you should convert your
261 script to use `mkstemp' instead. Additionally, `mkstemp' and `maketemp'
262 are now well-defined even if the template argument does not end in six
265 ** The manual has been improved, including a new section on a composite
268 ** The `changecom' and `changequote' macros now treat an empty second
269 argument the same as if it were missing, rather than using the empty
270 string and making it impossible to end a comment or quote.
272 ** The `translit' macro now operates in linear instead of quadratic time,
273 and is now eight-bit clean.
275 ** The `-D', `-U', `-s', and `-t' command line options now take effect
276 after any files encountered earlier on the command line, rather than up
277 front, as is done in traditional implementations and required by POSIX.
279 * Noteworthy changes in Version 1.4.7 (2006-09-25) [stable]
280 Released by Eric Blake, based on CVS version 1.4.6a
282 ** Fix regression from 1.4.5 in handling a file that ends in a macro
283 expansion without arguments instead of a newline.
285 ** The define and pushdef macros now warn when the first argument is not
286 a string, rather than silently doing nothing.
288 ** Standard input can now be read more than once, as in 'm4 - file -', and
289 is not closed until all wrapped text is handled. This makes a
290 difference when stdin is not a regular file, and also fixes bugs when
291 using the syscmd or esyscmd macros from wrapped text.
293 ** When standard input is a seekable file, the m4exit, syscmd, and esyscmd
294 macros now restore the current position to the next unread byte rather
295 than discarding an arbitrary amount of buffered data.
297 ** SysV command-line compatibility is no longer a goal of GNU M4; the
298 focus will be instead on POSIX compatibility. This release continues to
299 support previous usage, but adds warnings in areas which will allow a
300 future version of GNU M4 to use its own extensions without being tied to
301 the SysV command line interface.
303 ** The no-op compatibility command line options -B, -N, -S, -T, and
304 --diversions may be withdrawn or assigned new meanings in future
305 releases, so they now issue a warning if used.
307 ** A new command line option -i replaces the compatibility -e as the
308 short spelling of --interactive, for consistency with other GNU tools; a
309 warning is issued if the old spelling is used, and it may be assigned
310 new meaning in future releases.
312 ** A new command line option --debugfile replaces the options -o and
313 --error-output as the preferred spelling. The old options were
314 misleading in their names and inconsistent with other GNU tools; they
315 are still silently accepted, but no longer documented in --help, and may
316 be assigned new meanings in future releases.
318 * Noteworthy changes in Version 1.4.6 (2006-08-25) [stable]
319 Released by Eric Blake, based on CVS version 1.4.5a
321 ** Fix buffer overruns in regexp and patsubst macros when handed a trailing
322 backslash in the replacement text, or when handling \n substitutions
323 beyond the number of \(\) groups.
325 ** Fix memory leak in regexp, patsubst, and changeword macros.
327 ** The format macro now understands %F, %g, and %G.
329 ** When loading frozen files, m4 now exits with status 63 if version
330 mismatch is detected.
332 ** Fix bugs that occurred when invoked with stdout or stderr closed,
333 and detect write failures to stdout or to the target of the debugfile
334 macro. In particular, the syscmd and esyscmd macros can no longer
335 interfere with the debug stream or diversions.
337 ** The m4exit macro now converts values outside the range 0-255 to 1.
339 ** It is now an error if a command-line input file ends in the middle of a
340 comment, matching the behavior of mid-string and mid-argument
343 ** The dnl macro now warns if end of file is encountered instead of a
346 ** The error message when end of file is encountered now uses the file and
347 line where the dangling construct started, rather than `NONE:0:'.
349 ** The debugmode and __file__ macros, and the -s/--synclines option, now
350 show what directory a file was found in when the -I/--include option or
351 M4PATH variable had an effect.
353 ** The changequote and changecom macros now work with 8-bit characters, and
354 quotes and comments that begin with `(' are properly recognized
357 ** The new macro __program__ is added, which allows the input file to issue
358 an error message that resembles messages from m4. Warning and error
359 messages have been reformatted to comply with GNU Coding Standards.
361 ** The errprint, m4wrap, and shift macros are now recognized only with
364 ** The index, substr, translit, regexp, and patsubst macros now produce
365 output when given only one argument, but still warn about a missing
368 ** The patsubst macro now reliably finds zero-length matches at the end
371 * Noteworthy changes in Version 1.4.5 (2006-07-15) [stable]
372 Released by Eric Blake, based on CVS version 1.4.4c
374 ** Fix sysval on BeOS, OS/2, and other systems that store exit status
375 in the low-order byte. Additionally, on Unix platforms, if syscmd was
376 terminated by a signal, sysval now displays the signal number shifted
377 left by eight bits, to match traditional m4 implementations.
379 ** The maketemp macro is no longer subject to platform limitations (such as
380 26 or 32 max files from a given template).
382 ** Frozen files now require that the first directive be V (version), to
383 better diagnose version mismatch. Additionally, if the F directive
384 (builtin function) names an unknown builtin that existed in the m4 that
385 froze the file but not in the current m4 (for example, changeword), the
386 warning is deferred until an attempt is made to actually use the
387 builtin. This allows downgrading from beta m4-1.4o to stable m4-1.4.5
388 without breaking autoconf.
390 ** The format and indir macros are now recognized only with arguments.
392 ** The eval macro no longer crashes on x86 architectures when dividing the
393 minimum integer by -1.
395 ** On systems with ecvt and fcvt, format no longer truncates trailing
396 zeroes on integers printed with %.0f. On systems without these
397 functions, format is no longer subject to a buffer overflow that
398 permitted arbitrary code execution.
400 ** On native Windows builds, the macro __windows__ is provided instead of
401 __unix__. Likewise, on OS/2 builds, the macro __os2__ is provided.
402 This allows input files to determine when syscmd might behave
405 ** Fix bug in 1.4.3 patch to use \n line-endings that did not work for
408 ** When given the empty string or 0, undivert is now documented as a no-op
409 rather than closing stdout, warning about a non-existent file, or trying
410 to read a directory as a file.
412 ** Many documentation improvements. Also, the manual is now distributed
413 under FDL 1.2, rather than a stricter verbatim-only license.
415 ** Raise the -L (--nesting-limit) command line option limit from 250 to
418 ** The decr, incr, divert, m4exit, and substr macros treat an empty number
419 as 0, issue a warning, and expand as normal; rather than issuing an
420 error and expanding to the empty string.
422 ** The eval macro now treats an empty radix argument as 10, handles radix 1,
423 and treats the width argument as number of digits excluding the sign,
424 for compatibility with other m4 implementations.
426 ** The ifdef, divert, m4exit, substr, and translit macros now correctly
427 ignore extra arguments.
429 ** The popdef and undefine macros now correctly accept multiple arguments.
431 ** Although changeword is on its last leg, if enabled, it now reverts to the
432 default (faster) regexp when passed the empty string.
434 ** The regexp and substr macros now warn and ignore a trailing backslash in
435 the replacement, and warn on \n for n larger than the number of
436 sub-expressions in the regexp.
438 * Noteworthy changes in Version 1.4.4b (2006-06-17) [beta]
439 Released by Eric Blake, based on CVS version 1.4.4a
441 ** Fix a recursive push_string crashing bug, which affected changequote of
442 three or more characters on some compilers.
444 ** Use automake to fix build portability issues.
446 ** Fix a recursive m4wrap crashing bug.
448 ** Fix a 1 in 2**32 hash crashing bug.
450 ** Tracing a macro by name is now persistent, even if the macro is
451 subsequently undefined or redefined. The traceon and traceoff macros no
452 longer warn about undefined symbols. This solves a crash when using
453 indir on an undefined macro traced with the -t option, as well as an
454 incorrect result of ifdef. Furthermore, tracing is no longer
455 transferred with builtins, solving the bug of "m4 -tm4_eval" failing to
456 give trace output on the input
457 "define(`m4_eval',defn(`eval'))m4_eval(1)".
459 ** Fix a crash when a macro is undefined while collecting its arguments, by
460 always using the definition that was in effect before argument
461 collection. This behavior matches the C pre-processor, and means that
462 the sequence "define(`f',`1')f(define(`f',`2'))f" is now documented to
463 result in "12", rather than the previously undocumented "22".
465 ** Update the regex engine to fix several bugs.
467 ** Fix a potential crash on machines where char is signed.
469 * Noteworthy changes in Version 1.4.4 (Oct 2005) [stable]
470 Released by Gary V. Vaughan
472 ** ./configure --infodir=/usr/share/info now works correctly.
474 ** When any file named on the command line is missing exit with status 1.
476 * Noteworthy changes in Version 1.4.3 (Mar 2005) [stable]
477 Released by Gary V. Vaughan
479 ** DESTDIR installs now work correctly.
481 ** Don't segfault with uncompilable regexps to changeword().
483 ** Always use \n line-endings for frozen files (fixes a Windows bug).
485 ** Portability fix for systems lacking mkstemp(3).
487 ** Approximately 20% speed up in the common case of usage with autoconf.
489 ** Supported on QNX 6.3.
491 * Noteworthy changes in Version 1.4.2 (Aug 2004) [stable]
492 Released by Paul Eggert
494 ** No user visible changes; portability bug fixes only.
496 * Noteworthy changes in Version 1.4.1 (Jun 2004) [stable]
497 Released by Paul Eggert
499 ** maketemp now creates an empty file with the given name, instead of merely
500 returning the name of a nonexistent file. This closes a security hole.
502 * Noteworthy changes in Version 1.4 (Oct 1994) [stable]
503 Released by Franc,ois Pinard
505 ** (No user visible changes)
508 Version 1.3 - September 1994, by Franc,ois Pinard
510 * Diversions are created as needed. Option `-N' is still accepted, but
511 otherwise ignored. Users should use only negative diversion numbers,
512 instead of high positive numbers, for diverting to nowhere.
514 * Diversions should also work faster. No temporary files will be needed
515 at all if all diversions taken altogether do not use more than 512K.
517 * Frozen state files may be produced with the `--freeze-state' (-F)
518 option and later brought back through the `--reload-state' (-R) option.
520 Version 1.2 - July 1994, by Franc,ois Pinard
522 * In patsubst(STRING, REGEXP, REPLACEMENT), \& in REPLACEMENT has been
523 changed to represent this part of STRING matched by the whole REGEXP,
524 instead of the whole STRING as before. \0 does the same, but emits a
525 diagnostic saying it will disappear in some subsequent release.
527 * eval(EXPR) emits a diagnostic if EXPR has suffixed crumb. The same for
528 other numeric conversions in incr(), decr(), divert(), etc.
530 * `--fatal-warnings' (-E) stops execution at first warning.
532 * `--nesting-limit=LEVEL' (-L LEVEL) sets a limit to macro nesting.
533 It is initially fixed at 250.
535 * `--word-regexp=REGEXP' (-W REGEXP) modifies macro name syntax, like
536 does the new `changeword(REGEXP)' macro. This feature is experimental,
537 tell me your opinions about it. You do need --enable-changeword at
538 configure time to get these things. Do *not* depend on them yet.
540 * Trace output format is scannable by GNU Emacs' next-error function.
542 * Stack overflow is detected and diagnosed on some capable systems.
544 * Various bugs have been corrected, m4 should be more portable. See the
545 ChangeLog for details.
547 Version 1.1 - November 1993, by Franc,ois Pinard
549 Changes which might affect existing GNU m4 scripts:
551 * Option `-V' has been removed, use `--version' instead. `--version'
552 writes on standard output instead of standard error, and inhibits any
555 * `--no-gnu-extensions' has been renamed `--traditional'.
557 * In `eval', `^' used to indicate exponentiation, use `**' instead.
559 * The automatic undiversion which takes place at end of all input is
560 forced into the main output stream.
562 Changes which are unlikely to affect existing scripts:
564 * `--help' prints an usage summary on standard output. Script execution
567 * `--prefix-builtins' (-P) prefixes all builtin macros by `m4_'.
569 * Most builtin macros for which arguments are mandatory, called without
570 any arguments, are no more recognized as builtin macros: they are
571 consequently copied verbatim to the output stream.
573 * `define' and `pushdef' are usable with only one argument, they give
574 this argument an empty definition.
576 * `eval' new operators for binary representation handling: `^' for
577 exclusive-or, `~' for the bitwise negation, `<<' and `>>' for shifts.
579 * `eval' recognizes the notation 0bDIGITS for binary numbers and the
580 notation 0rRADIX:DIGITS for numbers in any radix from 1 to 36.
582 Version 1.0.3 - December 1992, by Franc,ois Pinard
584 Changes for the user:
586 * `dnl' outputs a diagnostic if immediately followed by `('. Usually,
587 `dnl' is followed by newline or whitespace.
589 * `ifelse' accepts without complaining the common idiom of having only
590 one argument. This is useful for introducing long comments.
592 * `eval' always expresses values as signed, whatever the radix.
594 * M4OPTS environment variable is no longer obeyed.
596 * `--no-warnings' option is renamed `--silent'.
598 * Debug lines use a new format more compatible with GNU standards.
600 * Various bugs have been corrected. See the ChangeLog for details.
602 Changes for the installer:
604 * GNU m4 now uses an Autoconf-generated configure script, and should be
605 more easily portable in many ways. (Cray is not supported yet).
607 * `make check' has been made more portable, expect no errors.
609 Changes for the programmer:
611 * Sources have been fully reindented to comply with GNU standards, and
612 cleaned up in many ways.
614 * Sources have been protoized. Non-ANSI compilers are automatically
615 detected, then sources are unprotoized on the fly before compilation.
617 * GNU m4 uses newer versions of obstack, regex, getopt, etc.
619 Version 1.0 - October 1991, by Rene' Seindal
621 * Uses GNU configure, taken from the gdb distribution.
623 * Uses GNU getopt(), with long option names.
625 * The -Q/+quiet option is added, which suppresses warnings about missing
626 or superflous arguments to built-in macros.
628 * Added default options via the M4OPTS environment variable.
630 * Several minor bugs have been fixed.
632 Version 0.99 - July 1991, by Rene' Seindal
634 * The builtins `incr' and `decr' are now implemented without use of
637 * The builtin `indir' is added, to allow for indirect macro calls
638 (allows use of "illegal" macro names).
640 * The debugging and tracing facilities has been enhanced considerably.
641 See the manual for details.
643 * The -tMACRO option is added, marks MACRO for tracing as soon as it
646 * Builtins are traced after renaming iff they were before.
648 * Named files can now be undiverted.
650 * The -Nnum option can be used to increase the number of divertions
653 * Calling changecom without arguments now disables all comment handling.
655 * A bug in `dnl' is fixed.
657 * A bug in the multi-character quoting code is fixed.
659 * Several typos in the manual has been corrected. More probably persist.
661 Version 0.75 - November 1990, by Rene' Seindal
663 * Implemented search path for include files (-I option and M4PATH
664 environment variable).
666 * Implemented builtin `format' for printf-like formatting.
668 * Implemented builtin `regexp' for searching for regular expressions.
670 * Implemented builtin `patsubst' for substitution with regular
673 * Implemented builtin `esyscmd', which expands to a shell commands output.
675 * Implemented `__file__' and `__line__' for use in error messages.
677 * Implemented character ranges in `translit'.
679 * Implemented control over debugging output.
681 * Implemented multi-character quotes.
683 * Implemented multi-character comment delimiters.
685 * Changed predefined macro `gnu' to `__gnu__'.
687 * Changed predefined macro `unix' to `__unix__', when the -G option is
688 not used. With -G, `unix' is still defined.
690 * Added program name to error messages.
692 * Fixed two missing null bytes bugs.
694 Version 0.50 - January 1990, by Rene' Seindal
696 * Initial beta release.
698 ========================================================================
705 Copyright (C) 1992-1994, 2004-2011 Free Software Foundation, Inc.
707 Permission is granted to copy, distribute and/or modify this document
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