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This directory contains the sources of the GNU C Library.
See the file "version.h" for what release version you have.

The GNU C Library is the standard system C library for all GNU systems,
and is an important part of what makes up a GNU system.  It provides the
system API for all programs written in C and C-compatible languages such
as C++ and Objective C; the runtime facilities of other programming
languages use the C library to access the underlying operating system.

In GNU/Linux systems, the C library works with the Linux kernel to
implement the operating system behavior seen by user applications.
In GNU/Hurd systems, it works with a microkernel and Hurd servers.

The GNU C Library implements much of the POSIX.1 functionality in the
GNU/Hurd system, using configurations i[4567]86-*-gnu.  The current
GNU/Hurd support requires out-of-tree patches that will eventually be
incorporated into an official GNU C Library release.

When working with Linux kernels, this version of the GNU C Library
requires Linux kernel version 3.2 or later on all architectures except
i[4567]86 and x86_64, where Linux kernel version 2.6.32 or later

Also note that the shared version of the libgcc_s library must be
installed for the pthread library to work correctly.

The GNU C Library supports these configurations for using Linux kernels:

	hppa-*-linux-gnu	Not currently functional without patches.
	x86_64-*-linux-gnu	Can build either x86_64 or x32
	powerpc-*-linux-gnu	Hardware or software floating point, BE only.
	powerpc64*-*-linux-gnu	Big-endian and little-endian.

If you are interested in doing a port, please contact the glibc
maintainers; see for more

See the file INSTALL to find out how to configure, build, and install
the GNU C Library.  You might also consider reading the WWW pages for
the C library at

The GNU C Library is (almost) completely documented by the Texinfo manual
found in the `manual/' subdirectory.  The manual is still being updated
and contains some known errors and omissions; we regret that we do not
have the resources to work on the manual as much as we would like.  For
corrections to the manual, please file a bug in the `manual' component,
following the bug-reporting instructions below.  Please be sure to check
the manual in the current development sources to see if your problem has
already been corrected.

Please see for bug reporting
information.  We are now using the Bugzilla system to track all bug reports.
This web page gives detailed information on how to report bugs properly.

The GNU C Library is free software.  See the file COPYING.LIB for copying
conditions, and LICENSES for notices about a few contributions that require
these additional notices to be distributed.  License copyright years may be
listed using range notation, e.g., 1996-2015, indicating that every year in
the range, inclusive, is a copyrightable year that would otherwise be listed
111 min ago Samuel Thibaulthurd: disable ifunc for nowmaster
5 hours ago Samuel ThibaultAdd more hurd exception to local headers list
8 hours ago Adhemerval... posix: Call _exit in failure case for posix_spawn{p...
10 hours ago Roland McGrathstpcpy is part of POSIX.1-2008 [BZ #3629]
22 hours ago Samuel Thibaulthurd: fix _hurd_self_sigstate reference from ____longjm...
2 days ago H.J. LuCount number of logical processors sharing L2 cache
3 days ago Joseph MyersFix powerpc64 ceil, rint etc. on sNaN input (bug 20160).
3 days ago Joseph MyersFix powerpc32 ceil, rint etc. on sNaN input (bug 20160).
3 days ago Paul E. MurphyReplace M_El with lit_e in
3 days ago Paul E. MurphyReplace M_PI_4l with lit_pi_4_d in
3 days ago Paul E. MurphyReplace M_PIl with lit_pi in
3 days ago Paul E. MurphyReplace M_PI2l with lit_pi_2_d in
3 days ago Paul E. MurphyRefactor M_ macros defined in
3 days ago Joseph MyersAvoid "invalid" exceptions from powerpc fabsl (sNaN...
3 days ago Joseph MyersRemove unused macros from
3 days ago Paul E. MurphyRefactor type specific macros using regexes
3 months ago glibc-2.23 The GNU C Library ============...
9 months ago glibc-2.22 The GNU C Library ============...
15 months ago glibc-2.21 The GNU C Library ============...
20 months ago glibc-2.20 The GNU C Library ============...
2 years ago glibc-2.19 The GNU C Library ============...
2 years ago glibc-2.18 The GNU C Library ============...
3 years ago glibc-2.17 The GNU C Library ============...
3 years ago glibc-2.16-ports-merge libc and ports repositories merged...
3 years ago glibc-2.16.0 The GNU C Library ============...
3 years ago glibc-2.16 The GNU C Library ============...
3 years ago glibc-2.16-tps Translation project snapshot for...
4 years ago glibc-2.15 glibc 2.15 release
4 years ago glibc-2.14.1 glibc 2.14.1 release
5 years ago glibc-2.14 Tag 2.14 release
5 years ago glibc-2.13 glibc 2.13 release.
5 years ago glibc-2.12.2 glibc 2.12.2 release
111 min ago master
11 hours ago release/2.23/master
5 days ago hjl/erms/ifunc
5 days ago ibm/2.20/master
6 days ago release/2.20/master
7 days ago release/2.19/master
10 days ago hjl/cache/master
10 days ago hjl/benchtests/memset
11 days ago azanella/bz12683
2 weeks ago hjl/
2 weeks ago dj/malloc
2 weeks ago release/2.22/master
3 weeks ago release/2.21/master
3 weeks ago siddhesh/tunables
3 weeks ago hjl/benchtests/master
3 weeks ago hjl/2.17/memset
Cached version (1335s old)
 NaCl   glibc 
glibc/pb-stable.git Petr Baudis' queue of bugfixes for stable... 5 years ago
glibc/nacl-glibc.git Port of glibc to Google Native Client (NaCl) 6 years ago
glibc/history.git Unaltered CVS history 7 years ago