Embedded C library http://uclibc-ng.org

William Pitcock 3ac5fd7eca libcrypt: add support for SHA256-CRYPT password hashing 12 years ago
docs 4d537e8547 libm: disable tail jump trick if __SSP_ALL__ (was using wrong conditional) 13 years ago
extra 3ac5fd7eca libcrypt: add support for SHA256-CRYPT password hashing 12 years ago
include bc4bc07d93 sys/queue.h: update to eglibc version 12 years ago
ldso f69319d5a7 libdl: rudimentary locking for dlopen/dlsym/dlclose 12 years ago
libc 09dfeda9cf x86_64: add PLT bypass for __sigsetjmp 12 years ago
libcrypt 3ac5fd7eca libcrypt: add support for SHA256-CRYPT password hashing 12 years ago
libintl 59f3d4df3b intl, nptl_db: fix prerequisites 13 years ago
libm 5f1678b1df libm: pass CFLAGS to e500 fenv 12 years ago
libnsl f4eebb6146 Add Makefile support for DSBT ELF. 13 years ago
libpthread c79f09a9a3 nptl: add missing pt-tempname.c 12 years ago
libresolv f4eebb6146 Add Makefile support for DSBT ELF. 13 years ago
librt f4eebb6146 Add Makefile support for DSBT ELF. 13 years ago
libubacktrace f1505e1581 libubacktrace: Conditionally link libgcc_eh 12 years ago
libutil f4eebb6146 Add Makefile support for DSBT ELF. 13 years ago
test 01d4f7b456 tests: ignore new inet test 12 years ago
utils 1155493454 ldd: take LD_LIBRARY_PATH into account 12 years ago
.gitignore a032a65870 mass sync with glibc nptl 14 years ago
COPYING.LIB 751dd180c3 Update license file to Lesser GPL v2.1 18 years ago
COPYING.LIB.boilerplate 99eb65208a boilerplate license we use 17 years ago
Changelog 58a0daa6a5 add MULTILIB_DIR: Path component for libdirs 14 years ago
DEDICATION.mjn3 38583d5986 Today's Toni's birthday. Seems an appropriate day to add this. 20 years ago
INSTALL ae14cd49a8 buildsys: s/CROSS/CROSS_COMPILE/g 12 years ago
MAINTAINERS 00ebae02f6 fix compilation of linuxthreads for sparc 15 years ago
Makefile 105ceb0fdc always define CONFIG_SHELL 14 years ago
Makefile.help ae14cd49a8 buildsys: s/CROSS/CROSS_COMPILE/g 12 years ago
Makefile.in ae14cd49a8 buildsys: s/CROSS/CROSS_COMPILE/g 12 years ago
Makerules 7682323a3a Merge remote-tracking branch 'origin/master' into prelink 12 years ago
README 331634d4c1 copyright update 18 years ago
Rules.mak a796d26367 buildsys: drop manual TARGET_SUBARCH .config lookup 12 years ago
TODO f69319d5a7 libdl: rudimentary locking for dlopen/dlsym/dlclose 12 years ago

README


uClibc - a Small C Library for Linux
Erik Andersen

uClibc (aka Clibc/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 Clinux)
systems with support for alpha, ARM, cris, e1, h8300, i386, i960,
m68k, microblaze, 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, then using glibc may make more sense. Unless, for
example, that 12 Terabytes will be Network Attached Storage and
you plan to burn Linux into the system's firmware...

uClibc is maintained by Erik Andersen and is licensed under the
GNU LESSER GENERAL PUBLIC LICENSE. This license allows you to
make closed source commercial applications using an unmodified
version of 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. You should, however,
carefuly review the license and make certain you understand and
abide by it strictly.


For installation instructions, see the file INSTALL.

uClibc strives to be standards compliant, which means that most
documentation written for SuSv3, or for glibc also applies to
uClibc functions. However, many GNU extensions are not supported
because they have not been ported, or more importantly, would
increase the size of uClibc disproportional to the added
functionality. There is some discussion of these differences
in the "docs" directory.

Additional information (recent releases, FAQ, mailing list, bugs,
etc.) can be found at http://www.uclibc.org/.

uClibc may be freely modified and distributed under the terms of
the GNU Lesser General Public License, which can be found in the
file COPYING.LIB.

Please Note:

There is an unwholesomely huge amount of code out there
that depends on the presence of GNU libc header files.
We have GNU libc compatible header files. So we have
committed a horrible sin in uClibc. We _lie_ and claim
to be GNU libc in order to force these applications to
work as their developers intended. This is IMHO,
pardonable, since these defines are not really intended
to check for the presence of a particular library, but
rather are used to define an _interface_. Some programs
are especially chummy with glibc, and may need this
behavior disabled by adding CFLAGS+=-D__FORCE_NOGLIBC

If you want to make special exceptions in your code which are
specifically for uClibc, you can make certain to include features.h,
and then have your code check for uClibc as follows:

#ifdef __UCLIBC__
do_something_special();
#endif

And most of all, be sure to have some fun! :-)
-Erik