README
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 arc*-*-linux-gnu
28 arm-*-linux-gnueabi
29 csky-*-linux-gnuabiv2
30 hppa-*-linux-gnu
31 i[4567]86-*-linux-gnu
32 x86_64-*-linux-gnu Can build either x86_64 or x32
33 ia64-*-linux-gnu
34 m68k-*-linux-gnu
35 microblaze*-*-linux-gnu
36 mips-*-linux-gnu
37 mips64-*-linux-gnu
38 or1k-*-linux-gnu
39 powerpc-*-linux-gnu Hardware or software floating point, BE only.
40 powerpc64*-*-linux-gnu Big-endian and little-endian.
41 s390-*-linux-gnu
42 s390x-*-linux-gnu
43 riscv32-*-linux-gnu
44 riscv64-*-linux-gnu
45 sh[34]-*-linux-gnu
46 sparc*-*-linux-gnu
47 sparc64*-*-linux-gnu
48
49If you are interested in doing a port, please contact the glibc
50maintainers; see https://www.gnu.org/software/libc/ for more
51information.
52
53See the file INSTALL to find out how to configure, build, and install
54the GNU C Library. You might also consider reading the WWW pages for
55the C library at https://www.gnu.org/software/libc/.
56
57The GNU C Library is (almost) completely documented by the Texinfo manual
58found in the `manual/' subdirectory. The manual is still being updated
59and contains some known errors and omissions; we regret that we do not
60have the resources to work on the manual as much as we would like. For
61corrections to the manual, please file a bug in the `manual' component,
62following the bug-reporting instructions below. Please be sure to check
63the manual in the current development sources to see if your problem has
64already been corrected.
65
66Please see https://www.gnu.org/software/libc/bugs.html for bug reporting
67information. We are now using the Bugzilla system to track all bug reports.
68This web page gives detailed information on how to report bugs properly.
69
70The GNU C Library is free software. See the file COPYING.LIB for copying
71conditions, and LICENSES for notices about a few contributions that require
72these additional notices to be distributed. License copyright years may be
73listed using range notation, e.g., 1996-2015, indicating that every year in
74the range, inclusive, is a copyrightable year that would otherwise be listed
75individually.
76