Appendix F Contributors to the GNU C Library
The GNU C Library project would like to thank its many contributors.
Without them the project would not have been nearly as successful as
it has been. Any omissions in this list are accidental. Feel free to
file a bug in bugzilla if you have been left out or some of your
contributions are not listed. Please keep this list in alphabetical
- Nick Alcock for contributing fixes to allow the GNU C Library to be built with the
stack smashing protector enabled.
- John David Anglin for various fixes to the hppa port.
- Albert ARIBAUD for Y2038 related fixes.
- Ryan S. Arnold for his improvements for Linux on PowerPC and his direction
as FSF Project Steward for the GNU C Library.
- Miles Bader for writing the
argp argument-parsing package, and the
- Jeff Bailey for his maintainership of the HPPA architecture.
- Petr Baudis for bug fixes and testing.
- Anton Blanchard for various fixes.
- Stephen R. van den Berg for contributing a highly-optimized
- Ondrej Bilka for contributing optimized string routines for x64 and various
- Eric Blake for adding O(n) implementations of
- Philip Blundell for the ports to Linux/ARM
arm-ANYTHING-linuxaout) and ARM standalone
arm-ANYTHING-none), as well as for parts of the IPv6
- Per Bothner for the implementation of the
libio library which
is used to implement
- Mark Brown for his direction as part of the GNU C Library steering
- Thomas Bushnell for his contributions to Hurd.
- Rogerio Alves Cardoso for various fixes to PowerPC.
- Paul Clarke for optimized functions on PowerPC.
- Palmer Dabbelt for contributing the port to Linux/RISC-V.
- DJ Delorie for maintenance of Linux/RISC-V, and various fixes.
- Wilco Dijkstra for various fixes.
- Liubov Dmitrieva for optimized string and math functions on x86-64 and
- Ulrich Drepper for his many contributions in almost all parts of
the GNU C Library, including:
- writing most of the POSIX Threads Library originally.
- internationalization support, including the
- Linux i386/ELF support
drand48 families of functions,
_r’ versions of the
family; System V shared memory and IPC support code
- several highly-optimized string functions for ix86
- many math functions
- the character conversion functions (
- the floating-point printing function used by
printf and friends
and the floating-point reading function used by
strtod and friends
catgets support and the entire suite of multi-byte
and wide-character support functions (wctype.h, wchar.h, etc.).
- versioning of objects on the symbol level
- Richard Earnshaw for continued support and fixes to the various ARM
- Paul Eggert for the
mktime function and for his direction as
part of the GNU C Library steering committee.
- Steve Ellcey for various fixes.
- Mike FABIAN for automating Unicode updates, for updating the locale data
for ISO 14651, for updating the library Unicode support, and for various
locale updates and fixes.
- Tulio Magno Quites Machado Filho for adding a new class of installed
headers for low-level platform-specific functionality and one such for
PowerPC and various fixes.
- Mike Frysinger for his maintaining of the IA64 architecture and for
testing and bug fixing.
- Martin Galvan for contributing gdb pretty printer support to glibc and adding
an initial set of pretty printers for structures in the POSIX Threads library.
- Michael Glad for the passphrase-hashing function
crypt and related
- Wolfram Gloger for contributing the memory allocation functions
free and related
- Gabriel F. T. Gomes for his improvements for Linux on PowerPC and for
implementing the IEEE 128-bit floating point type for PowerPC.
- Torbjörn Granlund for fast implementations of many of the string
- Michael J. Haertel for writing the merge sort function
and malloc checking functions like
- Bruno Haible for his improvements to the
iconv and locale
- Richard Henderson for the port to Linux on Alpha
alpha-anything-linux) and software floating-point support.
- David Holsgrove for the port to Linux on MicroBlaze.
- Leonhard Holz for various fixes.
- Daniel Jacobowitz for various fixes and enhancements.
- Andreas Jaeger for the port to Linux on x86-64
x86_64-anything-linux and his work on Linux for MIPS
mips-anything-linux), implementing the ldconfig
program, providing a test suite for the math library and for his
direction as part of the GNU C Library steering committee.
- Aurelien Jarno for various fixes.
- Rical Jasan for contributing various fixes in the GNU C Library manual.
- Jakub Jelinek for implementing a number of checking functions,
software floating-point support and for
his direction as part of the GNU C Library steering committee.
- Simon Josefsson for the
- Geoffrey Keating for the port to Linux on PowerPC
- Brendan Kehoe for contributing the port to the MIPS DECStation running
Ultrix 4 (
mips-dec-ultrix4) and the port to the DEC Alpha
running OSF/1 (
- Mark Kettenis for implementing the
utmpx interface and a utmp
daemon, and for a Hesiod NSS module.
- Andi Kleen for implementing pthreads lock elision with TSX.
- Kazumoto Kojima for the port of the Mach and Hurd code to the MIPS
mips-anything-gnu) and for his work on the
- Maxim Kuvyrkov for various fixes.
- Andreas Krebbel for his work on Linux for s390 and s390x.
- Thorsten Kukuk for providing an implementation for NIS (YP) and NIS+,
securelevel 0, 1 and 2 and for the implementation for a caching daemon
for NSS (nscd).
- Akhilesh Kumar for various fixes to locales.
- Jeff Law for various fixes.
- Doug Lea for contributing the memory allocation functions
free and related
- Chris Leonard for various fixes and enhancements to localedata.
- Ilya Leoshkevich for various fixes.
- Dmitry V. Levin for various fixes.
- Stefan Liebler for various fixes.
- Hongjiu Lu for providing the support for a Linux 32-bit runtime
environment under x86-64 (x32), for porting to Linux on IA64, for
improved string functions, a framework for testing IFUNC
implementations, for implementing Intel Control-Flow Enforcement
Technology, and many bug fixes.
- Rafal Luzynski for contributing support for two grammatical forms of month
names, and for various fixes to locales.
- Luis Machado for optimized functions on PowerPC.
- David J. MacKenzie for his contribution to the
function and writing the tar.h header.
- Greg McGary for adding runtime support for bounds checking.
- Roland McGrath for writing most of the GNU C Library originally, for his
work on the Hurd port, his direction as part of the GNU C Library steering
committee and as FSF Project Steward for the GNU C Library, and for many bug
fixes and reviewing of contributions.
- Allan McRae for various fixes.
- Jason Merrill for the port to the Sequent Symmetry running Dynix
version 3 (
- Chris Metcalf for the port to Linux/Tile
tilepro-anything-linux) and support for the generic Linux
kernel syscall interface used by several newer ports.
- Jim Meyering for various fixes.
- David Miller for contributing the port to Linux/Sparc
- Alan Modra for his improvements for Linux on PowerPC.
- David Mosberger-Tang for contributing the port to Linux/Alpha
- Wainer dos Santos Moschetta for various fixes to powerpc.
- Stephen Moshier for implementing some 128-bit long double format math
- Stephen Munroe for his port to Linux on PowerPC64
powerpc64-anything-linux) and for adding optimized
implementations for PowerPC.
- Paul E. Murphy for various fixes on PowerPC and for implementing the IEEE
128-bit floating point type for PowerPC.
- Joseph S. Myers for numerous bug fixes for the libm functions, for
his maintainership of the ARM and MIPS architectures and the math
component, improving cross-compilation and cross-testing of
the GNU C Library, expanded coverage of conformtest, merging the ports/
subdirectory into the GNU C Library main repository and his direction as
FSF Project Steward for the GNU C Library.
- Marko Myllynen for various fixes.
- Szabolcs Nagy for various fixes.
- Will Newton for contributing some optimized string functions and pointer
encryption support for ARM and various fixes.
- Carlos O’Donell for his maintainership of the HPPA architecture, for
maintaining the GNU C Library web pages and wiki, for his direction as FSF
Project Steward for the GNU C Library and various bug fixes.
- Alexandre Oliva for adding TLS descriptors for LD and GD on x86 and
x86-64, for the am33 port, for completing the MIPS n64/n32/o32 multilib
port, for thread-safety, async-signal safety and async-cancellation
safety documentation in the manual, for his direction as FSF Project
Maintainer and for various fixes.
- Paul Pluzhnikov for various fixes.
- Marek Polacek for various fixes.
- Siddhesh Poyarekar for various fixes, an implementation of a framework for
performance benchmarking of functions and implementing the tunables
- Tom Quinn for contributing the startup code to support SunOS shared
libraries and the port to SGI machines running Irix 4
- Torvald Riegel for the implementation of new algorithms for semaphores,
pthread_rwlock and condition variables.
- Maciej W. Rozycki for MIPS fixes, support for ABSOLUTE symbols,
and various fixes.
- Leonardo Sandoval for various fixes.
- Pravin Satpute for writing sorting rules for some Indian languages.
- Douglas C. Schmidt for writing the quick sort function used as a
- Will Schmidt for optimized string functions on PowerPC.
- Andreas Schwab for the port to Linux/m68k
m68k-anything-linux), for his direction as part of
the GNU C Library steering committee, and for various bug fixes.
- Martin Schwidefsky for porting to Linux on s390
s390-anything-linux) and s390x
- Thomas Schwinge for his contribution to Hurd and the SH architecture.
- Martin Sebor for various fixes.
- Andrew Senkevich for contributing vector math function implementations for x86.
- Carlos Eduardo Seo for optimized functions on PowerPC.
- Arjun Shankar for testing and bug fixing.
- Marcus Shawcroft for contributing the AArch64 port.
- Franz Sirl for various fixes.
- Jes Sorensen for porting to Linux on IA64 (
- Rajalakshmi Srinivasaraghavan for various fixes and optimizations on PowerPC
and for implementing the IEEE 128-bit floating point type for PowerPC.
- Richard Stallman for his contribution to the
- Alfred M. Szmidt for various fixes.
- Chung-Lin Tang for contributing the Nios II port.
- Ian Lance Taylor for contributing the port to the MIPS DECStation
running Ultrix 4 (
- Samuel Thibault for improving the Hurd port.
- Pino Toscano for various fixes.
- Matt Turner for various fixes to the Alpha port.
- Tim Waugh for the implementation of the POSIX.2
- Ulrich Weigand for various fixes to the PowerPC64 and Arm ports.
- Florian Weimer for his maintainership of the network component, for handling
of security issues, and for various fixes.
- Zack Weinberg for the
explicit_bzero implementation and for various
- Mark Wielaard for various fixes.
- Eric Youngdale for implementing versioning of objects on the symbol level.
- Adhemerval Zanella for optimized functions on PowerPC, ISO C threads support
and various fixes.
Some code in the GNU C Library comes from other projects and might be under
a different license:
- The timezone support code is derived from the public-domain timezone
package by Arthur David Olson and his many contributors.
- Some of the support code for Mach is taken from Mach 3.0 by CMU;
the file if_ppp.h is also copyright by CMU, but under a different license;
see the file LICENSES for the text of the licenses.
- The random number generation functions
initstate, which are also the basis for the
srand functions, were written by Earl T. Cohen
for the University of California at Berkeley and are copyrighted by the
Regents of the University of California. They have undergone minor
changes to fit into the GNU C Library and to fit the ISO C standard,
but the functional code is Berkeley’s.
- The Internet-related code (most of the inet subdirectory) and
several other miscellaneous functions and header files have been
included from 4.4 BSD with little or no modification. The copying
permission notice for this code can be found in the file LICENSES
in the source distribution.
getnameinfo functions and supporting
code were written by Craig Metz; see the file LICENSES for
details on their licensing.
- The DNS resolver code is taken directly from BIND 8.2.3-T5B, which
includes copyrighted code from UC Berkeley and from Digital Equipment
Corporation. See the file LICENSES for the text of the DEC license.
- The code to support Sun RPC is taken verbatim from Sun’s
RPCSRC-4.0 distribution; see the file LICENSES for the
text of the license.
- The math functions are taken from
fdlibm-5.1 by Sun
Microsystems, as modified by J.T. Conklin, Ian Lance Taylor,
Ulrich Drepper, Andreas Schwab, and Roland McGrath.
- Many of the IEEE 64-bit double precision math functions
(in the sysdeps/ieee754/dbl-64 subdirectory) come
from the IBM Accurate Mathematical Library, contributed by IBM.
- Many of the IA64 math functions are taken from a collection of
“Highly Optimized Mathematical Functions for Itanium” that Intel
makes available under a free license; see the file LICENSES for