2009-02-25 00:45:59 +01:00
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This directory contains the sources of the GNU C Library.
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See the file "version.h" for what release version you have.
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2006-03-06 11:59:43 +01:00
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The GNU C Library is the standard system C library for all GNU systems,
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and is an important part of what makes up a GNU system. It provides the
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system API for all programs written in C and C-compatible languages such
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as C++ and Objective C; the runtime facilities of other programming
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languages use the C library to access the underlying operating system.
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In GNU/Linux systems, the C library works with the Linux kernel to
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implement the operating system behavior seen by user applications.
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In GNU/Hurd systems, it works with a microkernel and Hurd servers.
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The GNU C Library implements much of the POSIX.1 functionality in the
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2013-04-06 18:00:35 +02:00
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GNU/Hurd system, using configurations i[4567]86-*-gnu. The current
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2012-06-30 17:27:06 +02:00
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GNU/Hurd support requires out-of-tree patches that will eventually be
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incorporated into an official GNU C Library release.
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2006-03-06 11:59:43 +01:00
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2012-08-03 15:42:47 +02:00
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When working with Linux kernels, this version of the GNU C Library
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Require Linux 3.2 except on x86 / x86_64, 3.2 headers everywhere.
In <https://sourceware.org/ml/libc-alpha/2016-01/msg00885.html> I
proposed a minimum Linux kernel version of 3.2 for glibc 2.24, since
Linux 2.6.32 has reached EOL.
In the discussion in February, some concerns were expressed about
compatibility with OpenVZ containers. It's not clear that these are
real issues, given OpenVZ backporting kernel features and faking the
kernel version for guest software, as discussed in
<https://sourceware.org/ml/libc-alpha/2016-02/msg00278.html>. It's
also not clear that supporting running GNU/Linux distributions from
late 2016 (at the earliest) on a kernel series from 2009 is a sensible
expectation. However, as an interim step, this patch increases the
requirement everywhere except x86 / x86_64 (since the controversy was
only about those architectures); the special caveats and settings can
easily be removed later when we're ready to increase the requirements
on x86 / x86_64 (and if someone would like to raise the issue on LWN
as suggested in the previous discussion, that would be welcome). 3.2
kernel headers are required everywhere by this patch.
(x32 already requires 3.4 or later, so is unaffected by this patch.)
As usual for such a change, this patch only changes the configure
scripts and associated documentation. The intent is to follow up with
removal of dead __LINUX_KERNEL_VERSION conditionals. Each __ASSUME_*
or other macro that becomes dead can then be removed independently.
Tested for x86_64 and x86.
* sysdeps/unix/sysv/linux/configure.ac (LIBC_LINUX_VERSION):
Define to 3.2.0.
(arch_minimum_kernel): Likewise.
* sysdeps/unix/sysv/linux/configure: Regenerated.
* sysdeps/unix/sysv/linux/i386/configure.ac (arch_minimum_kernel):
Define to 2.6.32.
* sysdeps/unix/sysv/linux/i386/configure: Regenerated.
* sysdeps/unix/sysv/linux/x86_64/64/configure.ac
(arch_minimum_kernel): Define to 2.6.32.
* sysdeps/unix/sysv/linux/x86_64/64/configure: Regenerated.
* README: Document Linux 3.2 requirement.
* manual/install.texi (Linux): Document Linux 3.2 headers
requirement.
* INSTALL: Regenerated.
2016-02-24 18:15:12 +01:00
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requires Linux kernel version 3.2 or later on all architectures except
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i[4567]86 and x86_64, where Linux kernel version 2.6.32 or later
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suffices.
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2006-03-06 11:59:43 +01:00
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2010-02-10 16:34:34 +01:00
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Also note that the shared version of the libgcc_s library must be
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installed for the pthread library to work correctly.
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2006-03-06 11:59:43 +01:00
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The GNU C Library supports these configurations for using Linux kernels:
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2014-02-10 16:36:16 +01:00
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aarch64*-*-linux-gnu
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2014-02-12 15:54:57 +01:00
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alpha*-*-linux-gnu
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2014-02-08 02:49:39 +01:00
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arm-*-linux-gnueabi
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2014-04-29 09:08:48 +02:00
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hppa-*-linux-gnu Not currently functional without patches.
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2012-04-27 23:35:47 +02:00
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i[4567]86-*-linux-gnu
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2012-06-30 17:27:06 +02:00
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x86_64-*-linux-gnu Can build either x86_64 or x32
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2014-02-16 04:07:25 +01:00
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ia64-*-linux-gnu
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2014-02-10 20:05:01 +01:00
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m68k-*-linux-gnu
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2014-02-17 02:08:21 +01:00
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microblaze*-*-linux-gnu
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2014-02-11 00:30:21 +01:00
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mips-*-linux-gnu
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mips64-*-linux-gnu
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2013-10-07 01:23:41 +02:00
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powerpc-*-linux-gnu Hardware or software floating point, BE only.
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2013-10-05 09:02:10 +02:00
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powerpc64*-*-linux-gnu Big-endian and little-endian.
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2006-03-06 11:59:43 +01:00
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s390-*-linux-gnu
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s390x-*-linux-gnu
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2012-08-07 18:40:32 +02:00
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sh[34]-*-linux-gnu
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2006-03-06 11:59:43 +01:00
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sparc*-*-linux-gnu
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sparc64*-*-linux-gnu
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2014-02-10 16:54:47 +01:00
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tilegx-*-linux-gnu
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tilepro-*-linux-gnu
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2006-03-06 11:59:43 +01:00
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2012-04-27 23:35:47 +02:00
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If you are interested in doing a port, please contact the glibc
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maintainers; see http://www.gnu.org/software/libc/ for more
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information.
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2006-03-06 11:59:43 +01:00
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See the file INSTALL to find out how to configure, build, and install
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the GNU C Library. You might also consider reading the WWW pages for
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the C library at http://www.gnu.org/software/libc/.
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The GNU C Library is (almost) completely documented by the Texinfo manual
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found in the `manual/' subdirectory. The manual is still being updated
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and contains some known errors and omissions; we regret that we do not
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have the resources to work on the manual as much as we would like. For
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corrections to the manual, please file a bug in the `manual' component,
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following the bug-reporting instructions below. Please be sure to check
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the manual in the current development sources to see if your problem has
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already been corrected.
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1995-02-18 02:27:10 +01:00
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2004-12-19 10:41:58 +01:00
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Please see http://www.gnu.org/software/libc/bugs.html for bug reporting
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information. We are now using the Bugzilla system to track all bug reports.
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This web page gives detailed information on how to report bugs properly.
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1995-02-18 02:27:10 +01:00
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The GNU C Library is free software. See the file COPYING.LIB for copying
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2002-08-20 23:51:55 +02:00
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conditions, and LICENSES for notices about a few contributions that require
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2011-10-20 23:46:24 +02:00
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these additional notices to be distributed. License copyright years may be
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2015-02-11 23:39:30 +01:00
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listed using range notation, e.g., 1996-2015, indicating that every year in
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2011-10-20 23:46:24 +02:00
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the range, inclusive, is a copyrightable year that would otherwise be listed
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individually.
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