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uClibc -- a C library for embedded systems
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uClibc (aka µClibc/pronounced
yew-see-lib-see) is a C library for developing embedded Linux systems.
It is much smaller than the
GNU C Library,
but nearly all applications supported by glibc also work perfectly with
uClibc. Porting applications from glibc to uClibc typically involves
just recompiling the source code. uClibc even supports shared libraries
and threading. It currently runs on standard Linux
and MMU-less (also known as µClinux)
systems with support for alpha, ARM, i386, i960, h8300, m68k, mips/mipsel,
PowerPC, SH, SPARC, and v850 processors.
If you are building an embedded Linux system and you find that glibc is
eating up too much space, you should consider using uClibc. If you are
building a huge fileserver with 12 Terabytes of storage, than using
glibc may be a better choice...
uClibc is maintained by
Erik Andersen
and is licensed under the
GNU LIBRARY GENERAL PUBLIC LICENSE
. This license allows you to make closed source commercial applications using
uClibc (Please consider sharing some of the money you make ;-). You do not need
to give away all your source code just because you use uClibc and/or run on Linux.
Mailing List Information
uClibc has a mailing list.
To subscribe, go and visit
this page.
Frequently Asked Questions
You might want to take a look at the
list of Frequently Asked Questions
before asking questions on the mailing list...
Working Applications List
These days, pretty much everything compiles with uClibc. This
is a list of applications that are known
to work just fine with uClibc. Since most applications work just
fine with uClibc, we are especially interested in knowing about any
applications that either do not compile or do not work
properly with uClibc. Submissions are welcome!
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Latest News
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- 9 August 2002, uClibc 0.9.13 Released
CodePoet Consulting is pleased to announce the immediate availability of
uClibc 0.9.13. After several days of testing, this release is looking very
solid. This release fixes three security vulnerabilites in previous
releases. There was an off-by-one buffer overflow in the group handling
code, and integer overflows in calloc() and xdr_array().
This release adds native shared library support for the Hitachi
SuperH architecture, thanks to Stefan Allius and Edie C. Dost. A
new mmap based malloc was implemented by Miles Bader. This is much
smarter than the old "malloc-simple" and is now the default for
mmu-less systems, where it should greatly help reduce memory
fragmentation and wastage. In addition to these larger items, there
has been a lot of work done to make uClibc a cleaner, more
capable, library. Most applications now compile and run without
any trouble.
The
Changelog
and source code
for this release are available here.
Have fun!
- 9 August 2002, uClibc now mirrored on kernel.org!
uClibc is now available from the kernel.org mirrors! This should make
uClibc downloads much faster. The kernel.org mirrors will have all
uClibc release versions (everything but the daily snapshots).
Here is a list of all the kernel.org mirror sites.
Just pick the closest mirror site, and then go to "/pub/linux/libs/uclibc/"
to download uClibc. For example, is you live the USA, you can go to
http://www.us.kernel.org/pub/linux/libs/uclibc/ to download the latest
uClibc release from a nice fast system.
- 11 July 2002, Native uClibc toolchains updated
CodePoet Consulting (i.e. Erik) has released updated native
uClibc/gcc-3.1 and uClibc/gcc-2.95 toolchains. These toolchains
build real gcc cross compilers (i.e. not just a wrapper) and create
executables linked vs uClibc. These toolchains have been tested
and found working on x86, arm, and mmu-less arm. They should work
(at least in theory!) for all architectures supported by uClibc.
These toolchains should make it easy to anyone to build uClibc based
applications. Source code can be downloaded here.
Be aware that much of the needed source code will actually be downloaded on
demand when you compile things. To build the toolchain, simply
grab the source, edit the Makefile to select where you would like
the toolchain installed, run 'make', and then go watch TV, eat
dinner, or visit with your friends while it compiles. It takes
about 15 minutes for Erik to compile the gcc-3.1 toolchain (w/C++ support)
on his Athlon XP 1600 (not counting the time it takes to download
source code). Your results may vary...
- 20 June 2002, uClibc 0.9.12 Released
CodePoet Consulting is pleased to announce the immediate availability of
uClibc 0.9.12. This release adds an i960 port, an initial alpha port,
fully working mips shared library support, shared library support fixes
for on powerpc, and many other improvements. One very exciting new feature
is nearly complete locale support, thanks to a lot of hard work by Manuel
Novoa III. uClibc's locale support is much smaller than glibc's,
though it is also slightly less flexible. This release was delayed by a
month due to the arrival of a new baby at Erik's house. For those that
have been anxiously waiting, this release should certainly be worth the
wait. Have fun!
The Changelog
and source code
for this release are available here.
- 28 May 2002, Native uClibc/gcc-3.1 toolchain
CodePoet Consulting has released source code and a Makefile to build a
gcc-3.1 toolchain that natively targets uClibc. Additionally, the
gcc-3.0.4 and gcc-2.95 toolchains have also been updated. These toolchains
make it easy to build uClibc based applications. Source code can be
downloaded here and is now much smaller,
since much of the needed binutils and gcc source code is now downloaded on
demand. To build the toolchain, simply grab the source, edit the Makefile
to select where you would like the toolchain installed, and then run 'make'
and wait for it to compile.
- 10 April 2002, uClibc 0.9.11 Released
CodePoet Consulting is pleased to announce the immediate availability of
uClibc 0.9.11. This release is primarily focused on fixing the issues that
have turned up since the last release. Several bugs in the gcc wrapper
have been fixed, allowing applications such as iproute2 and XFree86 to link properly.
Large file support has been improved, and a thread locking bug was
fixed that could cause s*printf calls to deadlock when threading was
enabled. Several bugs were also fixed with the powerpc, h8300, m68k,
sparc, and mips architecture support. Many additional applications now
compile and run perfectly and have been added to the working applications list .
The Changelog
and source code
for this release are available here.
- Old News
Click here to read older news.
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Sponsors
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Please visit our sponsors and thank them for their support! They have
provided money, equipment, bandwidth, etc. Next time you need help with a
project, consider these fine companies! Several individuals have also
contributed (If you have contributed and would like your name added here,
just email Erik and let him know).
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Do you like uClibc? Do you need support? Do you need some feature
added? Then why not help out? We are happy to accept donations
(such as bandwidth, mirrors sites, and hardware for the various
architectures). We can also provide support contracts, and implement
funded feature requests. To contribute, you can either click on the
Donate image to donate using PayPal, or you can contact Erik at
CodePoet Consulting
(we have a credit card machine so you can avoid PayPal if you wish).
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Other Open Source C libraries:
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