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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
2 days ago Zack WeinbergAllow direct use of math_ldbl.h in testsuite.master
2 days ago Zack WeinbergSplit DIAG_* macros to new header libc-diag.h.
2 days ago Zack WeinbergClean up conditionals for declaration of gets.
2 days ago Tulio Magno... Use independent type literals in libm-test-support.c
3 days ago Stefan LieblerGet rid of duplicate const declaration specifier warnin...
3 days ago Joseph MyersRun libm tests separately for each function.
4 days ago Gabriel F.... Add new templates for IEEE wrappers
4 days ago Joseph MyersAdd TFD_TIMER_CANCEL_ON_SET to sys/timerfd.h.
5 days ago Joseph MyersUse Linux 4.10 in
5 days ago Joseph MyersAdd IP_RECVFRAGSIZE from Linux 4.10.
6 days ago Tulio Magno... powerpc: Update powerpc-fpu libm-test-ulps
6 days ago Wainer dos... powerpc: Add tests for __ppc_set_ppr_* functions.
6 days ago Wainer dos... powerpc: Convert tests to the new support test-driver
6 days ago Mike FABIANBug 20313: Update to Unicode 9.0.0
7 days ago Joseph MyersRemove some unused libm-test exception macros.
8 days ago Zack WeinbergOne more obvious missing #include in the testsuite.
3 weeks ago glibc-2.25 The GNU C Library ============...
6 months ago glibc-2.24 The GNU C Library ============...
12 months ago glibc-2.23 The GNU C Library ============...
18 months ago glibc-2.22 The GNU C Library ============...
2 years ago glibc-2.21 The GNU C Library ============...
2 years ago glibc-2.20 The GNU C Library ============...
3 years ago glibc-2.19 The GNU C Library ============...
3 years ago glibc-2.18 The GNU C Library ============...
4 years ago glibc-2.17 The GNU C Library ============...
4 years ago glibc-2.16-ports-merge libc and ports repositories merged...
4 years ago glibc-2.16.0 The GNU C Library ============...
4 years ago glibc-2.16 The GNU C Library ============...
4 years ago glibc-2.16-tps Translation project snapshot for...
5 years ago glibc-2.15 glibc 2.15 release
5 years ago glibc-2.14.1 glibc 2.14.1 release
5 years ago glibc-2.14 Tag 2.14 release
3 hours ago zack/testsuite-isomac
16 hours ago zack/headers-cleanups
16 hours ago zack/testsuite-isomac-prep
2 days ago master
3 days ago release/2.24/master
5 days ago aaribaud/y2038
6 days ago release/2.19/master
10 days ago fw/math-split-tests
11 days ago tuliom/float128
11 days ago dj/malloc-tcache
2 weeks ago release/2.25/master
2 weeks ago gentoo/2.24
2 weeks ago gentoo/2.25
2 weeks ago azanella/bz12683
2 weeks ago ibm/2.24/master
2 weeks ago linaro/2.21/master
Cached version (167s old)
 NaCl   glibc 
glibc/pb-stable.git Petr Baudis' queue of bugfixes for stable... 6 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