Mail Archives: cygwin/2008/02/26/00:01:23
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A new release of m4, 1.4.10b-1, is available, replacing 1.4.10-1 as current.
NEWS
====
This is a new upstream release. It is marked as a beta release upstream,
but I think it is worth promoting to current right away because of the
speed increase it offers to autoconf. (It helps that I'm the upstream
developer, and did my development primarily on cygwin ;)
See also /usr/share/doc/m4-1.4.10b/.
You must rebuild from source if you want the experimental changeword
feature enabled, as using it can slow down normal operation, and since it
will disappear from the eventual m4 2.0.
DESCRIPTION
===========
m4 is an implementation of the traditional Unix macro processor. It is
mostly SVR4 compatible although it has some extensions (for example,
handling more than 9 positional parameters to macros). GNU m4 also has
built-in functions for including files, running shell commands, doing
arithmetic, etc.
UPDATE
======
To update your installation, click on the "Install Cygwin now" link on the
http://cygwin.com/ web page. This downloads setup.exe to your system.
Save it and run setup, answer the questions and pick up 'm4' from the
'Interpreters' category.
DOWNLOAD:
=========
Note that downloads from sources.redhat.com (aka cygwin.com) aren't
allowed due to bandwidth limitations. This means that you will need to
find a mirror which has this update, please choose the one nearest to you:
http://cygwin.com/mirrors.html
QUESTIONS:
==========
If you want to make a point or ask a question the Cygwin mailing list is
the appropriate place.
- --
Eric Blake
volunteer cygwin m4 maintainer
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* Noteworthy changes in Version 1.4.10b (2008-02-25) [beta]
Released by Eric Blake, based on git version 1.4.10a
** Security fixes for the -F option, for bugs present since -F was
introduced in 1.3: Avoid core dump with 'm4 -F file -t undefined', and
avoid arbitrary code execution with certain file names.
** Fix regression introduced in 1.4.9b in the `divert' builtin when more
than 512 kibibytes are saved in diversions on platforms like NetBSD
where fopen(name,"a+") seeks to the end of the file.
** The output of the `maketemp' and `mkstemp' builtins is now quoted if a
file was created. This is a minor security fix, because it was possible
(although rather unlikely) that an unquoted string could match an
existing macro name, such that use of the `mkstemp' output would trigger
inadvertent macro expansion and operate on the wrong file name.
** Enhance the `defn' builtin to support concatenation of multiple text
arguments, as required by POSIX. However, at this time, it is not
possible to concatenate a builtin macro with anything else; a warning is
now issued if this is attempted, although a future version of M4 may
lift this restriction to match other implementations.
** Enhance the `index' builtin to guarantee linear behavior and often
acheive sublinear results, in spite of the surprisingly large number of
systems with a brain-dead quadratic strstr(3).
** Enhance the `regexp' and `patsubst' builtins to cache frequently used
regular expressions, which speeds up typical Autoconf usage.
** Enhance the `format' builtin to warn for more suspicious usages, such as
missing arguments or problems parsing according to the format string.
** Enhance the `ifelse' and `shift' builtins so that tail-recursive
algorithms based on `$@' operate in linear, rather than quadratic, time
and memory.
** A number of portability improvements inherited from gnulib.
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