README

   1 This directory contains the sources of the GNU C Library.
   2 See the file "version.h" for what release version you have.
   3
   4 The GNU C Library is the standard system C library for all GNU systems,
   5 and is an important part of what makes up a GNU system.  It provides the
   6 system API for all programs written in C and C-compatible languages such
   7 as C++ and Objective C; the runtime facilities of other programming
   8 languages use the C library to access the underlying operating system.
   9
  10 In GNU/Linux systems, the C library works with the Linux kernel to
  11 implement the operating system behavior seen by user applications.
  12 In GNU/Hurd systems, it works with a microkernel and Hurd servers.
  13
  14 The GNU C Library implements much of the POSIX.1 functionality in the
  15 GNU/Hurd system, using configurations i[4567]86-*-gnu.
  16
  17 When working with Linux kernels, this version of the GNU C Library
  18 requires Linux kernel version 3.2 or later.
  19
  20 Also note that the shared version of the libgcc_s library must be
  21 installed for the pthread library to work correctly.
  22
  23 The 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         loongarch64-*-linux-gnu Hardware floating point, LE only.
  35         m68k-*-linux-gnu
  36         microblaze*-*-linux-gnu
  37         mips-*-linux-gnu
  38         mips64-*-linux-gnu
  39         or1k-*-linux-gnu
  40         powerpc-*-linux-gnu     Hardware or software floating point, BE only.
  41         powerpc64*-*-linux-gnu  Big-endian and little-endian.
  42         s390-*-linux-gnu
  43         s390x-*-linux-gnu
  44         riscv32-*-linux-gnu
  45         riscv64-*-linux-gnu
  46         sh[34]-*-linux-gnu
  47         sparc*-*-linux-gnu
  48         sparc64*-*-linux-gnu
  49
  50 If you are interested in doing a port, please contact the glibc
  51 maintainers; see https://www.gnu.org/software/libc/ for more
  52 information.
  53
  54 See the file INSTALL to find out how to configure, build, and install
  55 the GNU C Library.  You might also consider reading the WWW pages for
  56 the C library at https://www.gnu.org/software/libc/.
  57
  58 The GNU C Library is (almost) completely documented by the Texinfo manual
  59 found in the `manual/' subdirectory.  The manual is still being updated
  60 and contains some known errors and omissions; we regret that we do not
  61 have the resources to work on the manual as much as we would like.  For
  62 corrections to the manual, please file a bug in the `manual' component,
  63 following the bug-reporting instructions below.  Please be sure to check
  64 the manual in the current development sources to see if your problem has
  65 already been corrected.
  66
  67 Please see https://www.gnu.org/software/libc/bugs.html for bug reporting
  68 information.  We are now using the Bugzilla system to track all bug reports.
  69 This web page gives detailed information on how to report bugs properly.
  70
  71 The GNU C Library is free software.  See the file COPYING.LIB for copying
  72 conditions, and LICENSES for notices about a few contributions that require
  73 these additional notices to be distributed.  License copyright years may be
  74 listed using range notation, e.g., 1996-2015, indicating that every year in
  75 the range, inclusive, is a copyrightable year that would otherwise be listed
  76 individually.