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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
139ace95 20requires Linux kernel version 3.2 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
75eff3fe 27 aarch64*-*-linux-gnu
68b7efaa 28 alpha*-*-linux-gnu
c6bfe5c4 29 arm-*-linux-gnueabi
5abebba4 30 hppa-*-linux-gnu Not currently functional without patches.
adae8f5e 31 i[4567]86-*-linux-gnu
ee9247c3 32 x86_64-*-linux-gnu Can build either x86_64 or x32
c70a4b1d 33 ia64-*-linux-gnu
73588a72 34 m68k-*-linux-gnu
ef114eaf 35 microblaze*-*-linux-gnu
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36 mips-*-linux-gnu
37 mips64-*-linux-gnu
9ec1b13d 38 powerpc-*-linux-gnu Hardware or software floating point, BE only.
8b7d57cd 39 powerpc64*-*-linux-gnu Big-endian and little-endian.
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40 s390-*-linux-gnu
41 s390x-*-linux-gnu
6dad2c06 42 sh[34]-*-linux-gnu
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43 sparc*-*-linux-gnu
44 sparc64*-*-linux-gnu
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45 tilegx-*-linux-gnu
46 tilepro-*-linux-gnu
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48If you are interested in doing a port, please contact the glibc
49maintainers; see http://www.gnu.org/software/libc/ for more
50information.
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51
52See the file INSTALL to find out how to configure, build, and install
53the GNU C Library. You might also consider reading the WWW pages for
54the C library at http://www.gnu.org/software/libc/.
55
56The GNU C Library is (almost) completely documented by the Texinfo manual
57found in the `manual/' subdirectory. The manual is still being updated
58and contains some known errors and omissions; we regret that we do not
59have the resources to work on the manual as much as we would like. For
60corrections to the manual, please file a bug in the `manual' component,
61following the bug-reporting instructions below. Please be sure to check
62the manual in the current development sources to see if your problem has
63already been corrected.
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65Please see http://www.gnu.org/software/libc/bugs.html for bug reporting
66information. We are now using the Bugzilla system to track all bug reports.
67This web page gives detailed information on how to report bugs properly.
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68
69The GNU C Library is free software. See the file COPYING.LIB for copying
c6c6dd48 70conditions, and LICENSES for notices about a few contributions that require
627145fd 71these additional notices to be distributed. License copyright years may be
ef0ffcfd 72listed using range notation, e.g., 1996-2015, indicating that every year in
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73the range, inclusive, is a copyrightable year that would otherwise be listed
74individually.