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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.

When working with Linux kernels, this version of the GNU C Library
requires Linux kernel version 3.2 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:

	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
3 hours ago Samuel Thibaultcheck-execstack: Permit sysdeps to xfail some libsmaster
3 hours ago Samuel Thibaulthurd: Fix installed-headers tests
5 hours ago Samuel ThibaultFix new file header
5 hours ago Thomas Schwingehurd: Implement pipe2
5 hours ago Thomas Schwingehurd: SOCK_CLOEXEC and SOCK_NONBLOCK for socketpair
5 hours ago Thomas Schwingehurd: SOCK_CLOEXEC and SOCK_NONBLOCK for socket
5 hours ago Samuel Thibaulthurd: Enable thread-safe i386 atomic instructions
9 hours ago Leonardo Sandovalbenchtests: improve argument parsing through argparse...
10 hours ago H.J. LuINSTALL: Add a note for Intel CET status
31 hours ago Quentin PAGÈSoc_FR locale: Multiple updates (bug 23140, bug 23422).
32 hours ago Joseph MyersAvoid insecure usage of tmpnam in tests.
34 hours ago H.J. Lux86/CET: Document glibc.tune.x86_ibt and glibc.tune...
36 hours ago H.J. LuIntel CET: Document --enable-cet
38 hours ago H.J. Lux86-64: Use _CET_NOTRACK in memcmp-sse4.S
38 hours ago H.J. Lui386: Use _CET_NOTRACK in memset-sse2-rep.S
38 hours ago H.J. Lui386: Use _CET_NOTRACK in strcat-sse2.S
5 months ago glibc-2.27.9000 Open master branch for glibc 2...
5 months ago glibc-2.27 The GNU C Library ============...
9 months ago glibc-2.26.9000 Open master branch for glibc 2...
9 months ago glibc-2.16.90 Open master branch for glibc 2...
9 months ago glibc-2.25.90 Open master branch for glibc 2...
9 months ago glibc-2.24.90 Open master branch for glibc 2...
9 months ago glibc-2.23.90 Open master branch for glibc 2...
9 months ago glibc-2.22.90 Open master branch for glibc 2...
9 months ago glibc-2.21.90 Open master branch for glibc 2...
9 months ago glibc-2.20.90 Open master branch for glibc 2...
9 months ago glibc-2.19.90 Open master branch for glibc 2...
9 months ago glibc-2.18.90 Open master branch for glibc 2...
9 months ago glibc-2.17.90 Open master branch for glibc 2...
9 months ago glibc-2.16-ports-before-merge Last change to the ports tree befor...
11 months ago glibc-2.26 FROM: Siddhesh Poyarekar <siddhesh...
17 months ago glibc-2.25 The GNU C Library ============...
3 hours ago master
31 hours ago azanella/c11-threads
6 days ago fw/holes
8 days ago release/2.27/master
13 days ago release/2.26/master
2 weeks ago azanella/aarch64-mempcpy
3 weeks ago gabriel/powerpc-ieee128-printscan
4 weeks ago aaribaud/y2038-rfc-3-wip
4 weeks ago aaribaud/tmp
5 weeks ago aaribaud/y2038-submitted-v1
5 weeks ago aaribaud/y2038-rfc-3
5 weeks ago zack/elf-builtin-expect-conversion
5 weeks ago aaribaud/y2038-rfc-3-base
5 weeks ago google/grte/v5-2.27/master
6 weeks ago hjl/pr23240/fw
6 weeks ago fw/bug21242
Cached version (1044s old)
 NaCl   glibc 
glibc/pb-stable.git Petr Baudis' queue of bugfixes for stable... 7 years ago
glibc/nacl-glibc.git Port of glibc to Google Native Client (NaCl) 8 years ago
glibc/history.git Unaltered CVS history 9 years ago