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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.
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
14The GNU C Library implements much of the POSIX.1 functionality in the
15GNU/Hurd system, using configurations i[4567]86-*-gnu.
16
17When working with Linux kernels, this version of the GNU C Library
18requires Linux kernel version 3.2 or later.
19
20Also note that the shared version of the libgcc_s library must be
21installed for the pthread library to work correctly.
22
23The GNU C Library supports these configurations for using Linux kernels:
24
25 aarch64*-*-linux-gnu
26 alpha*-*-linux-gnu
27 arm-*-linux-gnueabi
28 csky-*-linux-gnuabiv2
29 hppa-*-linux-gnu
30 i[4567]86-*-linux-gnu
31 x86_64-*-linux-gnu Can build either x86_64 or x32
32 ia64-*-linux-gnu
33 m68k-*-linux-gnu
34 microblaze*-*-linux-gnu
35 mips-*-linux-gnu
36 mips64-*-linux-gnu
37 powerpc-*-linux-gnu Hardware or software floating point, BE only.
38 powerpc64*-*-linux-gnu Big-endian and little-endian.
39 s390-*-linux-gnu
40 s390x-*-linux-gnu
41 riscv64-*-linux-gnu
42 sh[34]-*-linux-gnu
43 sparc*-*-linux-gnu
44 sparc64*-*-linux-gnu
45
46If you are interested in doing a port, please contact the glibc
47maintainers; see https://www.gnu.org/software/libc/ for more
48information.
49
50See the file INSTALL to find out how to configure, build, and install
51the GNU C Library. You might also consider reading the WWW pages for
52the C library at https://www.gnu.org/software/libc/.
53
54The GNU C Library is (almost) completely documented by the Texinfo manual
55found in the `manual/' subdirectory. The manual is still being updated
56and contains some known errors and omissions; we regret that we do not
57have the resources to work on the manual as much as we would like. For
58corrections to the manual, please file a bug in the `manual' component,
59following the bug-reporting instructions below. Please be sure to check
60the manual in the current development sources to see if your problem has
61already been corrected.
62
63Please see https://www.gnu.org/software/libc/bugs.html for bug reporting
64information. We are now using the Bugzilla system to track all bug reports.
65This web page gives detailed information on how to report bugs properly.
66
67The GNU C Library is free software. See the file COPYING.LIB for copying
68conditions, and LICENSES for notices about a few contributions that require
69these additional notices to be distributed. License copyright years may be
70listed using range notation, e.g., 1996-2015, indicating that every year in
71the range, inclusive, is a copyrightable year that would otherwise be listed
72individually.