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1This directory contains the sources of the GNU C Library.
2See the file "version.h" for what release version you have.
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3
4The GNU C Library is the standard system C library for all GNU systems,
5and is an important part of what makes up a GNU system. It provides the
6system API for all programs written in C and C-compatible languages such
7as C++ and Objective C; the runtime facilities of other programming
8languages use the C library to access the underlying operating system.
9
10In GNU/Linux systems, the C library works with the Linux kernel to
11implement the operating system behavior seen by user applications.
12In GNU/Hurd systems, it works with a microkernel and Hurd servers.
13
3858bf28 14The GNU C Library implements much of the POSIX.1 functionality in the
a01f19c8 15GNU/Hurd system, using configurations i[4567]86-*-gnu. The current
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16GNU/Hurd support requires out-of-tree patches that will eventually be
17incorporated into an official GNU C Library release.
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7aab07e4 19When working with Linux kernels, this version of the GNU C Library
6dad2c06 20requires Linux kernel version 2.6.16 or later.
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22Also note that the shared version of the libgcc_s library must be
23installed for the pthread library to work correctly.
24
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25The GNU C Library supports these configurations for using Linux kernels:
26
adae8f5e 27 i[4567]86-*-linux-gnu
ee9247c3 28 x86_64-*-linux-gnu Can build either x86_64 or x32
29d73d86 29 powerpc-*-linux-gnu Hardware or software floating point
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30 powerpc64-*-linux-gnu
31 s390-*-linux-gnu
32 s390x-*-linux-gnu
6dad2c06 33 sh[34]-*-linux-gnu
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34 sparc*-*-linux-gnu
35 sparc64*-*-linux-gnu
36
3858bf28 37The code for other CPU configurations supported by volunteers outside of
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38the core glibc maintenance effort is contained in the `ports' add-on,
39located in the `ports' subdirectory of the source tree.
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effbd42a 41 aarch64*-*-linux-gnu
6dad2c06 42 alpha*-*-linux-gnu
adae8f5e 43 am33*-*-linux-gnu Not currently functional
6dad2c06 44 arm-*-linux-gnueabi
ee9247c3 45 hppa-*-linux-gnu Not currently functional without patches.
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46 ia64-*-linux-gnu
47 m68k-*-linux-gnu
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48 mips-*-linux-gnu
49 mips64-*-linux-gnu
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50 tilegx-*-linux-gnu
51 tilepro-*-linux-gnu
3858bf28 52
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53If you are interested in doing a port, please contact the glibc
54maintainers; see http://www.gnu.org/software/libc/ for more
55information.
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57See the file INSTALL to find out how to configure, build, and install
58the GNU C Library. You might also consider reading the WWW pages for
59the C library at http://www.gnu.org/software/libc/.
60
61The GNU C Library is (almost) completely documented by the Texinfo manual
62found in the `manual/' subdirectory. The manual is still being updated
63and contains some known errors and omissions; we regret that we do not
64have the resources to work on the manual as much as we would like. For
65corrections to the manual, please file a bug in the `manual' component,
66following the bug-reporting instructions below. Please be sure to check
67the manual in the current development sources to see if your problem has
68already been corrected.
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70Please see http://www.gnu.org/software/libc/bugs.html for bug reporting
71information. We are now using the Bugzilla system to track all bug reports.
72This web page gives detailed information on how to report bugs properly.
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73
74The GNU C Library is free software. See the file COPYING.LIB for copying
c6c6dd48 75conditions, and LICENSES for notices about a few contributions that require
627145fd 76these additional notices to be distributed. License copyright years may be
e6898b8d 77listed using range notation, e.g., 2000-2013, indicating that every year in
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78the range, inclusive, is a copyrightable year that would otherwise be listed
79individually.