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This directory contains the sources of the GNU C Library.
See the file "version.h" for what release version you have.

The GNU C Library is the standard system C library for all GNU systems,
and is an important part of what makes up a GNU system.  It provides the
system API for all programs written in C and C-compatible languages such
as C++ and Objective C; the runtime facilities of other programming
languages use the C library to access the underlying operating system.

In GNU/Linux systems, the C library works with the Linux kernel to
implement the operating system behavior seen by user applications.
In GNU/Hurd systems, it works with a microkernel and Hurd servers.

The GNU C Library implements much of the POSIX.1 functionality in the
GNU/Hurd system, using configurations i[4567]86-*-gnu.  The current
GNU/Hurd support requires out-of-tree patches that will eventually be
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When working with Linux kernels, this version of the GNU C Library
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Also note that the shared version of the libgcc_s library must be
installed for the pthread library to work correctly.

The GNU C Library supports these configurations for using Linux kernels:

aarch64*-*-linux-gnu
alpha*-*-linux-gnu
arm-*-linux-gnueabi
hppa-*-linux-gnu	Not currently functional without patches.
i[4567]86-*-linux-gnu
x86_64-*-linux-gnu	Can build either x86_64 or x32
ia64-*-linux-gnu
m68k-*-linux-gnu
microblaze*-*-linux-gnu
mips-*-linux-gnu
mips64-*-linux-gnu
powerpc-*-linux-gnu	Hardware or software floating point, BE only.
powerpc64*-*-linux-gnu	Big-endian and little-endian.
s390-*-linux-gnu
s390x-*-linux-gnu
sh[34]-*-linux-gnu
sparc*-*-linux-gnu
sparc64*-*-linux-gnu
tilegx-*-linux-gnu

maintainers; see http://www.gnu.org/software/libc/ for more
information.

See the file INSTALL to find out how to configure, build, and install
the GNU C Library.  You might also consider reading the WWW pages for
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The GNU C Library is (almost) completely documented by the Texinfo manual
found in the manual/' subdirectory.  The manual is still being updated
and contains some known errors and omissions; we regret that we do not
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corrections to the manual, please file a bug in the manual' component,
following the bug-reporting instructions below.  Please be sure to check
the manual in the current development sources to see if your problem has

Please see http://www.gnu.org/software/libc/bugs.html for bug reporting
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The GNU C Library is free software.  See the file COPYING.LIB for copying
listed using range notation, e.g., 1996-2015, indicating that every year in
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