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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 hours ago Andrew SenkevichFixed wrong vector sincos/sincosf ABI to have it compat... master
4 hours ago Aurelien JarnoSPARC64: update
18 hours ago Anton Blanchardpowerpc: Add a POWER8-optimized version of sinf()
19 hours ago Tulio Magno... powerpc: Add a POWER8-optimized version of expf()
22 hours ago John David... hppa: fix loading of global pointer in _start [BZ ...
22 hours ago H.J. LuCheck Prefer_ERMS in memmove/memcpy/mempcpy/memset
25 hours ago Andreas SchwabReturn proper status from _nss_nis_initgroups_dyn ...
27 hours ago Florian WeimerCorrect bug number in ChangeLog [BZ #18960]
34 hours ago H.J. LuCompile tst-cleanupx4 test with -fexceptions
39 hours ago Aurelien Jarnoi686/multiarch: Regenerate ulps
46 hours ago Andreas SchwabAvoid array-bounds warning for strncat on i586 (bug...
2 days ago Richard Hendersonelf.h: Add declarations for BPF
2 days ago Richard Hendersonelf.h: Sync with the gabi webpage
3 days ago Stefan LieblerS390: Fix relocation of _nl_current_LC_CATETORY_used...
3 days ago Aurelien JarnoMIPS: run tst-mode-switch-{1,2,3}.c using test-skeleton.c
3 days ago Joseph MyersAvoid "inexact" exceptions in i386/x86_64 trunc functio...
4 months ago glibc-2.23 The GNU C Library ============...
10 months ago glibc-2.22 The GNU C Library ============...
16 months ago glibc-2.21 The GNU C Library ============...
21 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 ============...
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...
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
54 min ago release/2.23/master
2 hours ago master
3 hours ago release/2.22/master
23 hours ago hjl/pr20314
34 hours ago hjl/pr18645
36 hours ago hjl/ifunc/master
39 hours ago hjl/pr20139/master
47 hours ago hjl/pr20309/master
9 days ago hjl/benchtests/wall-time
3 weeks ago linaro/2.21/master
3 weeks ago hjl/erms/2.23
3 weeks ago hjl/erms/2.22
3 weeks ago linaro/2.23/master
4 weeks ago release/2.19/master
5 weeks ago hjl/erms/ifunc
5 weeks ago ibm/2.20/master
Cached version (2957s 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