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夹谷和裕
2023-12-01

GNU M4

Introduction to GNU M4

GNU 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.

GNU M4 is a macro processor in the sense that it copies its input to

the output expanding macros as it goes. Macros are either builtin or

user-defined and can take any number of arguments. Besides just doing

macro expansion, m4 has builtin functions for including named files,

running UNIX commands, doing integer arithmetic, manipulating text in

various ways, recursion etc... m4 can be used either as a front-end to

a compiler or as a macro processor in its own right.

One of the biggest users of GNU M4 is the

GNU Autoconf project.

Downloading M4

The latest stable version is 1.4.18, and can be found on

http://ftp.gnu.org/gnu/m4/

[via http] and

ftp://ftp.gnu.org/gnu/m4/

[via FTP].

It can also be found on one of our FTP mirrors.

The stable development branch can also be checked out from git, using

either of:

git clone git://git.sv.gnu.org/m4

git clone http://git.savannah.gnu.org/r/m4.git

followed by:

git checkout -b branch-1.4 origin/branch-1.4

Documentation

GNU M4 documentation can be found in several formats at

http://www.gnu.org/software/m4/manual/.

You may also find more information about GNU M4 by looking at your

local documentation. For example, you might try looking in

/usr/share/doc/m4/, or use info m4 at the shell prompt.

Mailing Lists

GNU M4 has several mailing lists:

,

,

, and

.

Archives of these lists are available; see the details of each list

for a link to the archives.

You can subscribe to any GNU mailing list via the web as described

below. Or you can send an empty mail with a Subject: header line of

just "subscribe" to the relevant -request list. For example, to

subscribe yourself to the bug-m4 list, you would

send mail to

with no body and a Subject: header line of just "subscribe".

It has been necessary to moderate the GNU M4 mailing lists to prevent the

flood of spam. Postings to the lists are held for release by

the list moderator. Sometimes the moderators are unavailable for

brief periods of time. Please be patient when posting. If you

don't see the message in the list archive then it did not get posted.

Announcements

The low-volume mailing list

m4-announce contains all announcements about GNU M4. Important

announcments about M4 and most other GNU Software are also made on

.

Tracking Development

The moderate-volume mailing list

bug-m4

tracks all bug reports. For more information on submitting bugs,

please see the section Report a Bug below.

The moderate-volume mailing list

m4-patches

is used to propose and track all significant patches. GNU M4 is being

actively developed, and version 2.0 will have many new features, such

as better input control, multiple precision arithmetic and loadable

modules. More information about the future of GNU M4 is

at http://savannah.gnu.org/projects/m4/. You can track development

in git, using:

git clone git://git.sv.gnu.org/m4

git clone http://git.savannah.gnu.org/r/m4.git

You can also view the

git tree on the web.

Alternatively, there is a read-only CVS mirror here:

cvs -d :pserver:anonymous@pserver.git.sv.gnu.org:/m4.git \

co -d m4 HEAD

Please note that we do not suggest using test versions of GNU M4 for

production use. One feature of the 2.0 release will be translations;

you can track the progress of the i18n team at

http://translationproject.org/domain/m4.html.

Request an Enhancement

If you would like any new feature to be included in future versions

of GNU M4, please send a request to

m4-discuss.

This list tends to have a moderate volume of traffic.

Please remember that development of GNU M4 is a volunteer effort, and

you can also contribute to its development. For information about

contributing to the GNU Project, please read How to

help GNU.

Report a Bug

If you think you have found a bug in GNU M4, then please send as

complete a report as possible to . This includes what platform and compiler

you used to build M4, what version of M4 you are attempting to use,

and transcripts of any error messages or behavior that was contrary to

your expectations. Disagreements between the manual and the code are

also bugs.

Maintainer

GNU M4 is maintained by Gary V. Vaughan

and

Eric Blake

.

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