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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
2 days ago Joseph MyersSplit test-tgmath3 by function.master
2 days ago Joseph MyersObsolete nfsservctl.
2 days ago Joseph MyersFix year 2039 bug for localtime with 64-bit time_t...
3 days ago Leonardo SandovalAdd missing changelog from previous commit
3 days ago Leonardo Sandovalx86-64: remove duplicate line on PREFETCH_ONE_SET macro
3 days ago Florian Weimermath: Reverse include order in <math-type-macros-*.h>
3 days ago Andreas SchwabRemove unneeded setting of errno after malloc failure
3 days ago H.J. Lunptl: Remove __ASSUME_PRIVATE_FUTEX
4 days ago Joseph MyersAdd narrowing divide functions.
4 days ago Adhemerval... Fix concurrent changes on nscd aware files (BZ #23178)
4 days ago H.J. Lux86-64: Use IFUNC strncat inside
4 days ago Joseph MyersUpdate MIPS libm-test-ulps.
4 days ago Florian Weimersupport: Add TEST_COMPARE_BLOB, support_quote_blob
5 days ago Florian Weimermath: Merge strtod_nan_*.h into math-type-macros-*.h
5 days ago Joseph MyersAdd narrowing multiply functions.
6 days ago H.J. Lui386: Replace PREINIT_FUNCTION@PLT with *%eax in call
3 months ago glibc-2.27.9000 Open master branch for glibc 2...
3 months ago glibc-2.27 The GNU C Library ============...
7 months ago glibc-2.26.9000 Open master branch for glibc 2...
7 months ago glibc-2.16.90 Open master branch for glibc 2...
7 months ago glibc-2.25.90 Open master branch for glibc 2...
7 months ago glibc-2.24.90 Open master branch for glibc 2...
7 months ago glibc-2.23.90 Open master branch for glibc 2...
7 months ago glibc-2.22.90 Open master branch for glibc 2...
7 months ago glibc-2.21.90 Open master branch for glibc 2...
7 months ago glibc-2.20.90 Open master branch for glibc 2...
7 months ago glibc-2.19.90 Open master branch for glibc 2...
7 months ago glibc-2.18.90 Open master branch for glibc 2...
7 months ago glibc-2.17.90 Open master branch for glibc 2...
7 months ago glibc-2.16-ports-before-merge Last change to the ports tree befor...
9 months ago glibc-2.26 FROM: Siddhesh Poyarekar <siddhesh...
15 months ago glibc-2.25 The GNU C Library ============...
2 days ago master
3 days ago release/2.26/master
6 days ago release/2.27/master
6 days ago azanella/bz12683
9 days ago google/grte/v5-2.27/master
10 days ago fw/libm-noprivate-2.27
4 weeks ago ibm/2.22/master
4 weeks ago aaribaud/y2038-2.26-rfc-2
5 weeks ago release/2.22/master
5 weeks ago aaribaud/y2038-2.26-rfc-2-candidate
7 weeks ago zack/wip-check-localplt-2
7 weeks ago zack/wip-pthread-no-dupe-defns
2 months ago zack/remove-mode-bits
2 months ago mfabian/collation-update-2.27
2 months ago zack/c99-compliant-scanf
2 months ago arm/ilp32
Cached version (74s 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