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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<HTML>
<HEAD>
<TITLE>uClibc -- a C library for embedded systems</TITLE>
</HEAD>
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<TABLE BORDER=0 CELLSPACING=1 CELLPADDING=2>
<TR>
<td bgcolor="#000000">
<FONT FACE="lucida, helvetica" COLOR="#ccccc0">
<B>µ C l i b c</B>
</FONT>
</TD>
</TR>
</TABLE>
<p>
<!-- Begin Introduction section -->
<TABLE WIDTH=95% CELLSPACING=1 CELLPADDING=4 BORDER=1>
<TR><TD BGCOLOR="#ccccc0" ALIGN=center>
<A NAME="intro"> <BIG><B>
uClibc -- a C library for embedded systems
</font>
</A></B></BIG>
</TD></TR>
<TR><TD BGCOLOR="#eeeee0">
uClibc is a C library for embedded systems.
<p>
<p>
uClibc is maintained by
<a href="http://www.codepoet.org/andersen/erik/erik.html">Erik Andersen</a>
and is licensed under the
<a href="http://www.gnu.org/copyleft/lgpl.html">GNU LIBRARY GENERAL PUBLIC LICENSE</a>
<p>
It is my sincere hope that this is as useful to you as it is to me.
<!-- Begin Mailing list section -->
<TR><TD BGCOLOR="#ccccc0" ALIGN=center>
<A NAME="mailing_list"><BIG><B>
Mailing List
</A></B></BIG>
</TD></TR>
<TR><TD BGCOLOR="#eeeee0">
uClibc has a
<a href="http://uclibc.org/lists/uclibc/">mailing list</a>.
To subscribe, go and visit
<a href="http://uclibc.org/mailman/listinfo/uclibc">this page</a>.
<p>
<!-- Begin Download section -->
<TR><TD BGCOLOR="#ccccc0" ALIGN=center>
<A NAME="download"><BIG><B>
Download
</A></B></BIG>
</TD></TR>
<TR><TD BGCOLOR="#eeeee0">
<ul>
<li> I now have a script that creats a daily snapshot tarball of uClibc and posts it on
<a href="http://uclibc.org/uClibc-snapshot.tar.gz">here</a>.
<li> uClibc now has its own publically browsable
<a href="http://cvs.uclinux.org/cgi-bin/cvsweb/uClibc/">CVS tree</a> (this CVS tree is also mirrored onto
<a href="http://uclibc.org/cgi-bin/cvsweb/uClibc/">uclibc.org</a> but they are both the same thing).
<li> Anonymous
<a href="http://cvs.uclinux.org/cvs_anon.html">CVS access</a>, and
<li> For those that are actively contributing there is even
<a href="http://cvs.uclinux.org/cvs_write.html">CVS write access</a>.
</ul>
<!-- Begin Applications section -->
<TR><TD BGCOLOR="#ccccc0" ALIGN=center>
<A NAME="applications"><BIG><B>
Known Working Applications List
</A></B></BIG>
</TD></TR>
<TR><TD BGCOLOR="#eeeee0">
uClibc now has a <a href="http://uclibc.org/uClibc-apps.html">list of applications</a>
that are known to work. If you have any applications to add to the
list, submissions are welcome!
<!-- Begin Applications section -->
<TR><TD BGCOLOR="#ccccc0" ALIGN=center>
<A NAME="contribute"><BIG><B>
Help Support uClibc development
</A></B></BIG>
</TD></TR>
<TR><TD BGCOLOR="#eeeee0">
Do you like uClibc? Do you need support? Do you need some feature
added to uClibc? Then why not help out? We are happy to accept
donations, provide support contracts, and implement funded feature
requests. Additionally, uClibc is looking for corporate sponsors to
help sponsor development, pay for bandwidth, and help with hardware
donations, especially donations of hardware for non-Intel
architectures. Click here to help support uClibc and/or request features.
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<!-- Begin Latest News section -->
<TR><TD BGCOLOR="#ccccc0" ALIGN=center>
<A NAME="news">
<BIG><B>
Latest News</A>
</B></BIG>
</A>
</TD></TR>
<TR><TD BGCOLOR="#eeeee0">
<ul>
<li> <b>26 November 2001, powerpc shared libraries fully working</b>
<br>
Dave Schleef finished off the the work needed for shared library support on
powerpc. There had been a few problems remaining, and those are now squashed.
So shared libs on powerpc should be working fully now.
<p>
<li> <b>14 November 2001, m68 compiles again, Large file support working</b>
<br>
About a month ago I synced the header files with glibc 2.2.4 for better
C++ support and better standards compliance. I forgot to sync up m68k,
sparc, powerpc, and mipsel. Dave Schleef fixed powerpc while he was fixing
up the shared lib loader. I just fixed up m68k, sparc, and mipsel so they
should all compile again.
<p>
I also finished up fixing large file support (just enable DOLFS in your
Config file to enable it) and it is working just great, and greatly increases
the number of glibc applications that will work "out-of-the-tarball" without
needing any changes.
<li> <b>12 November 2001, powerpc shared lib support</b>
<br>
Thanks to David Schleef, uClibc now has full shared library support
on powerpc. This brings full shared library support to x86, ARM, and
now powerpc. Thanks Dave!
<p>
<li> <b>7 November 2001, uClibc application list</b>
<br>
uClibc now has a <a href="http://uclibc.org/uClibc-apps.html">list of applications</a>
that are known to work. If you have any applications to add to the
list, submissions are welcome!
<p>
<li> <b>18 October 2001, buildroot uClibc example system</b>
<br>
Those wanting an easy way to test out uClibc and give it
a test drive can download and compile
<a href="ftp://uclibc.org/buildroot.tar.gz">buildroot.tar.gz</a>. This
is a nifty buildsystem that will automagically download and build
a <a href="http://user-mode-linux.sourceforge.net/">User-Mode Linux</a>
kernel, and will then download source for and compile up a fully
working uClibc based root filesystem. This should make it easy for
people to create their own projects. I hope that this build system
will allow people to more easily use and build uClibc based systems.
As an example of how nicely this works, the
<a href="http://tuxscreen.net/">Tuxscreen Project</a> is using a
<a href="http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/tuxscreen/buildroot-tux/">slightly adjusted variant of the buildroot system</a> to cross
compile the blob bootloader, linux kernel, and a uClibc based jffs2
root filesystem (busybox, tinylogin, udhcp, lrzsz, pcmcia-cs and
microwindows) for ARM. Pretty cool.
<p>
<li> <b>11 October 2001, v850 architecture support</b>
<br>
Miles Bader has contributed support for the v850 architecture.
<p>
<li> <b>25 Spetember 2001, header files updated</b>
<br>
uClibc's header files are now in sync with glibc 2.2.4,
allowing better standards compliance, better portibility, and
better C++ support.
<p>
<li> <b>4 July 2001, ARM shared library support</b>
<br>
uClibc now has full shared library support on ARM.
<p>
<li> <b>9 May 2001, libm added</b>
<br>
uClibc now has a very complete math library.
<p>
<p> <li> <b>9 May 2001, ld.so added</b>
<br>
uClibc now has a native ld.so. It currently is only ported to work on x86,
but porting to other architectures should not be too difficult.
<p> <li> <b>15 March 2001, powerpc port added</b>
<br>
David Schleef contributed a powerpc port, which is now in CVS.
<p> <li> <b>19 February 2001, SH port added</b>
<br>
Jean-Yves Avenard contributed an SH port. See his email
with the initial patch <a href="http://uclibc.org/lists/uclibc/2001-February/000409.html">here</a>.
<p> <li> <b>16 January 2001, uClibc as a shared library</b>
<br>
As if January 16, uClibc can now be used (at least on x86) as a shared
library. See the <a href="http://uclibc.org/lists/uclibc/2001-January/000126.html">email</a>
announcing this achievement.
<p> <li> <b>11 January 2001, gcc wrapper added</b>
<br>
Manuel Novoa III has created a wrapper for gcc that makes compiling apps vs uClibc
as simple as just setting "CC" to gcc-uClibc-< arch>. This even works when cross
compiling! Very cool.
<p> <li> <b>3 January 2001, uClibc now has a web page</b>
<br>
A lot of work has been going on under the hood with uClibc,
so I decided to put together this webpage to let the world know
that it exists and is getting to be very usable.
</ul>
<!-- Begin TODO section -->
<TR><TD BGCOLOR="#ccccc0" ALIGN=center>
<A NAME="download"><BIG><B>
TODO
</A></B></BIG>
</TD></TR>
<TR><TD BGCOLOR="#eeeee0">
Here are a few things on the TODO list:
<ul>
<li> Shared library support for all supported architectures.
We now have our own ld.so, but it needs to be ported to
support each architecture.
<li> Shared library support for mmu-less systems. This is
very doable (think of C++ vtables for example), but will
take some work.
<li> Someone (hopefully) needs to volunteer to take the
<a href="http://www.linuxbase.org/test/">LSB Test Suite</a>,
pull out the C library testing stuff, and convert it
(perl script, by hand, I don't care how) into a form
that is usable without having it take over your entire
system (i.e. similar to what is currently in the uClibc
test suite). This will be <em>enormously</em> helpful!
<li> other things as I think of them.
</ul>
<!-- Begin Links section -->
<TR><TD BGCOLOR="#ccccc0" ALIGN=center>
<A NAME="links">
<BIG><B>
Other Open Source C libraries:
</A>
</B></BIG>
</A>
</TD></TR>
<TR><TD BGCOLOR="#eeeee0">
<ul>
<li> <a href="http://www.k9wk.com/cdoc.html">Al's FREE C Runtime Library</a>
<li><a href="http://www.fefe.de/dietlibc/">diet libc </a>
<li>the <a href="http://www.cs.vu.nl/~ast/minix.html">minix</a>
<a href="http://www.cs.vu.nl/cgi-bin/raw/pub/minix/2.0.0/src.tar"
>C library</a>
<li> <a href="http://sources.redhat.com/newlib/">newlib</a>
<li>and there is a
<a href="ftp://sourceware.cygnus.com/pub/ecos/">C library</a>, for
<a href="http://sources.redhat.com/ecos/">eCos</a> as well.
<ul>
<!-- Begin History section -->
<TR><TD BGCOLOR="#ccccc0" ALIGN=center>
<A NAME="history"><BIG><B>
History
</A></B></BIG>
</TD></TR>
<TR><TD BGCOLOR="#eeeee0">
This history and origin of uClibc is long and twisty.
In the beginning, there was <a
href="http://www.gnu.org/software/libc/libc.html">GNU libc</a>. Then, libc4
(which later became linux libc 5) forked from GNU libc version 1.07.4, with
additions from 4.4BSD, in order to support Linux. Later, the <a
href="http://www.cix.co.uk/~mayday/">Linux-8086 C library</a>, which is part of
the <a href="http://www.elks.ecs.soton.ac.uk/">elks project</a>, was created,
which was, apparently, largely written from scratch but also borrowed code from
libc4, glibc, some Atari library code, with bits and pieces from about 20 other
places. Then uClibc forked off from the Linux-8086 C library in order to run
on <a href="http://www.uclinux.org">µClinux</a>.
<p>
I had for some time been despairing over the state of C libraries in Linux.
GNU libc, the standard, is very poorly suited to embedded systems (and it just
gets bigger with every release). I spent quite a bit of time looking over the
other Open Source C libraries that I knew of (listed below), and none of them really
impressed me. I felt there was a real vacancy in the embedded Linux ecology.
The closest library to what I imagined an embedded C library should be was
uClibc. But that had a lot of problems too -- not the least of which was that,
traditionally, uClibc had a complete source tree fork in order to support each
and every new platform, resulting in a big mess of twisty versions, all
different. I decided to fix it and the result is what you see here.
My source tree has now become the official uClibc source tree and it now lives
on cvs.uclinux.org.
<p>
To start with, (with some initial help from <a
href="http://www.uclinux.org/developers/index.html">D. Jeff Dionne</a>), I
ported it to run on x86. I then grafted in the header files from glibc 2.1.3
and cleaned up the resulting breakage. This (plus some additional work) has
made it almost completely independant of kernel headers, a large departure from
its traditional tightly-coupled-to-the-kernel origins. I have written and/or
rewritten a number of things that were missing or broken, and sometimes grafted
in bits of code from the current glibc and libc5. I have also built a proper
platform abstraction layer, so now you can simply edit the file "Config" and
use that to decide which architecture you will be compiling for, and whether or
not your target has an MMU, and FPU, etc. I have also added a test suite,
which, though incomplete, is a good start. Several people have helped by
contributing ports to new architectures, and a lot of work has been done on
adding support for missing features.
<p>
<!-- Begin Links section -->
<TR><TD BGCOLOR="#ccccc0" ALIGN=center>
<A NAME="links">
<BIG><B>
Links to other useful stuff
</A>
</B></BIG>
</A>
</TD></TR>
<TR><TD BGCOLOR="#eeeee0">
<ul>
<li> <a href="http://www.uclinux.org/">The uClinux home page</a>.
<p>
<li> <a href="http://cvs.uclinux.org/">The uClinux CVS reporitory</a>.
<p>
<li> <a href="http://uclibc.org/">The uClibc.org home page</a>.
<p>
</ul>
<!-- End of Table -->
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<a href="mailto:andersen@codepoet.org">Erik Andersen</a><BR>
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