## 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 order.

- Osama Abdelkader for various contributions.
- Nick Alcock for contributing fixes to allow the GNU C Library to be built with the stack smashing protector enabled.
- Rogerio Alves Cardoso for various fixes to PowerPC.
- Amrita H. S. for contributions to the PowerPC port.
- John David Anglin for many fixes and co-maintainership of the HPPA port.
- H. Peter Anvin for work on the termios code.
- 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.
- Arsen Arsenović for various fixes.
- Miles Bader for writing the `argp` argument-parsing package, and the `argz`/`envz` interfaces.
- Ralf Bächle for contributing `fpu_control.h`, `regdef.h`, `sgidefs.h`, `sys/asm.h`, and `sys/regdef.h` under the `sysdeps/mips` directory.
- Jeff Bailey for his maintainership of the HPPA architecture.
- Frank Barrus for work on the threading library.
- Petr Baudis for bug fixes and testing.
- Frédéric Bérat for numerous fixes and contributions.
- Peter Bergner for contributions to and maintainership of the PowerPC port and maintainership of the RISC-V port.
- Indu Bhagat for various fixes.
- Anton Blanchard for various fixes.
- Pierre Blanchard for contributions to the AArch64 port.
- Stephen R. van den Berg for contributing a highly-optimized `strstr` function.
- Ondřej Bílka for contributing optimized string routines for x64 and various fixes.
- Uros Bizjak for many fixes and improvements.
- Eric Blake for adding O(n) implementations of `memmem`, `strstr` and `strcasestr`.
- Pierre Blanchard for contributing to the AArch64 port.
- 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 support code.
- Mahesh Bodapati for various fixes and optimizations for the Power architecture.
- Per Bothner for the implementation of the `libio` library which is used to implement `stdio` functions.
- Dridi Boukelmoune for various fixes.
- Pádraig Brady for various contributions.
- Mark Brown for his direction as part of the GNU C Library steering committee.
- Sergey Bugaev for numerous contributions to Hurd.
- Thomas Bushnell for his contributions to Hurd.
- Yinyu Cai for their maintainership of the LoongArch port.
- Daniel Cederman for fixes to the Sparc port.
- Kito Cheng for various fixes.
- James Chesterman for contributions to the AArch64 port.
- Paul Clarke for optimized functions on PowerPC.
- Alejandro Colomar for various fixes.
- Martin Coufal for various fixes.
- Mike Crowe for various fixes.
- Flavio Cruz for contributions to Hurd.
- Joana Cruz for contributions to the AArch64 port.
- Palmer Dabbelt for contributing the port to Linux/RISC-V.
- DJ Delorie for maintenance of Linux/RISC-V, numerous fixes, and handbook contributions.
- Jianbo Deng for the work on the Loongson port.
- Wilco Dijkstra for many fixes and improvements as well as maintainership of the AArch64 port.
- Liubov Dmitrieva for optimized string and math functions on x86-64 and x86.
- Jovan Dmitrovic for work on the mips port.
- Michael Hudson Doyle for various fixes.
- 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 `locale` and `localedef` utilities.
  - Linux i386/ELF support
  - the `hsearch` and `drand48` families of functions, reentrant ‘`…`_r``’ versions of the `random` family; System V shared memory and IPC support code
  - several highly-optimized string functions for ix86 processors
  - many math functions
  - the character conversion functions (`iconv`)
  - the `ftw` and `nftw` functions
  - the floating-point printing function used by `printf` and friends and the floating-point reading function used by `scanf`, `strtod` and friends
  - the `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 machine files.
- Paul Eggert for the `mktime` function, for his direction as part of the GNU C Library steering committee, and numerous fixes.
- Roy Eldar for various fixes.
- 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 many locale updates and fixes.
- Gabi Falk for various fixes.
- Olaf Flebbe and Ralf Bächle for contributing `sysdeps/mips/fpu_control.h`.
- Dylan Fleming for work on the AArch64 port.
- Alistair Francis for Y2038 related fixes.
- Mike Frysinger for his maintaining of the IA64 architecture and for testing and bug fixing.
- Collin Funk for many fixes and manual improvements.
- 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.
- Romain Geissler for various fixes.
- Michael Glad for the passphrase-hashing function `crypt` and related functions (no longer part of glibc, but we still appreciate his work).
- Wolfram Gloger for contributing the memory allocation functions functions `malloc`, `realloc` and `free` and related code.
- Noah Goldstein for contributing extensive x86 / x86-64 optimizations.
- 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 functions (`memcpy`, `strlen`, etc.).
- Evan Green for work on the RISC-V port.
- Wangyang Guo for various contributions.
- Vineet Gupta for their maintainership of the ARC port.
- Michael J. Haertel for writing the merge sort function `qsort` and malloc checking functions like `mcheck`.
- Bruno Haible for his improvements to the `iconv` and locale implementations and various fixes.
- Mao Han for the C-SKY port.
- 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.
- Stafford Horne for maintainership of the OpenRISC port.
- Ying Huang for work on the MIPS port.
- William Hunt for work on memory management.
- Guy-Fleury Iteriteka for many contributions to Hurd support.
- 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.
- Dev Jain for various fixes and work on memory management.
- Sam James for various fixes.
- Aurelien Jarno for various fixes.
- Rical Jasan for contributing various fixes in the GNU C Library manual.
- Michael Jeanson for the restartable sequences support.
- 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 `libidn` add-on.
- Ben Kallus for various fixes.
- Geoffrey Keating for the port to Linux on PowerPC (`powerpc-anything-linux`).
- 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 (`alpha-dec-osf1`).
- Mark Kettenis for implementing the `utmpx` interface and a utmp daemon, and for a Hesiod NSS module.
- Yury Khrustalev for extensive work on the AArch64 port and its maintainership, and various fixes.
- Simon Kissane for gmon improvements.
- Andi Kleen for implementing pthreads lock elision with TSX.
- Kazumoto Kojima for the port of the Mach and Hurd code to the MIPS architecture (`mips-anything-gnu`) and for his work on the SH architecture.
- Pavel Kozlov for maintainership of the ARC port.
- 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.
- Luna Lamb for various contributions to the AArch64 port.
- Jeff Law for various fixes.
- Doug Lea for contributing the memory allocation functions `malloc`, `realloc` and `free` and related code.
- Chris Leonard for various fixes and enhancements to localedata.
- Ilya Leoshkevich for various fixes.
- Dmitry V. Levin for various fixes.
- Stefan Liebler for numerous fixes and the maintainership of the S390 port.
- 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, many x86-64 improvements, and many bug fixes.
- Zhaoming Luo for work on the hurd port.
- Rafał Lużyński for contributing support for two grammatical forms of month names, and for various fixes to locales.
- Maxim Kuvyrkov for various fixes.
- Luis Machado for optimized functions on PowerPC.
- David J. MacKenzie for his contribution to the `getopt` function and writing the `tar.h` header.
- Lukasz Majewski for Y2038 related fixes.
- Miguel Martín for contributed tests.
- Manjunath Matti for contributions to the PowerPC port.
- 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.
- Meng Qinggang for contributions to the LoongArch port.
- Aaron Merey for contributed tests.
- Jason Merrill for the port to the Sequent Symmetry running Dynix version 3 (`i386-sequent-bsd`).
- Chris Metcalf for the port to Linux/Tile (`tilegx-anything-linux` and `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 (`sparc*-anything-linux`).
- Cupertino Miranda for various fixes.
- Alan Modra for his improvements for Linux on PowerPC.
- Lenard Mollenkopf for work on C2Y support.
- Sachin Monga for many fixes and contributions and maintainership of the PowerPC port.
- David Mosberger-Tang for contributing the port to Linux/Alpha (`alpha-anything-linux`).
- Wainer dos Santos Moschetta for various fixes to powerpc.
- Stephen Moshier for implementing some 128-bit long double format math functions.
- 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, C23 support, and his direction as FSF Project Steward for the GNU C Library.
- Marko Myllynen for various fixes.
- Szabolcs Nagy for many fixes, contributions, and maintainership of AArch64.
- Nab 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 numerous 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.
- Sunil K. Pandey for many fixes and x86-64 improvements.
- Ronan Pigott for various fixes.
- Andrew Pinski for contributions to the AArch64 port.
- Paul Pluzhnikov for various fixes.
- Marek Polacek for various fixes.
- Yat Long Poon for contributions to the Aarch64 port.
- Siddhesh Poyarekar for various fixes, an implementation of a framework for performance benchmarking of functions, implementing the tunables infrastructure, and handbook improvements.
- Tom Quinn for contributing the startup code to support SunOS shared libraries and the port to SGI machines running Irix 4 (`mips-sgi-irix4`).
- Tulio Magno Quites Machado Filho for adding a new class of installed headers for low-level platform-specific functionality, including the low-level platform-specific headers for PowerPC, for their maintainership of the PowerPC port and various fixes.
- Joe Ramsay for many contributions to the AArch64 port, in particular the vector library.
- Jens Remus for work on the s390 port.
- 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, various fixes and many contributions to the test suite.
- 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 fallback by `qsort`.
- 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 (`s390x-anything-linux`).
- 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, bug fixing, test suite additions, and many handbook contributions.
- Marcus Shawcroft for contributing the AArch64 port.
- TAMUKI Shoichi for various fixes.
- Joe Simmons-Talbott for various fixes.
- Franz Sirl for various fixes.
- Malte Skarupke for work on the threading library.
- Gavin Smith for various fixes.
- Jes Sorensen for porting to Linux on IA64 (`ia64-anything-linux`).
- Julian Squires for various fixes.
- Rajalakshmi Srinivasaraghavan for various fixes and optimizations on PowerPC, for implementing the IEEE 128-bit floating point type for PowerPC., and for their maintainership of the PowerPC port.
- Richard Stallman for his contribution to the `getopt` function.
- 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 (`mips-dec-ultrix4`).
- Samuel Thibault for maintainership of and numerous improvements to the Hurd port.
- Pino Toscano for various fixes.
- Matt Turner for various fixes to the Alpha port.
- Valery Ushakov for locale fixes.
- Feifei Wang for Hygon-related contributions.
- Hsiangkai Wang for various fixes.
- Tim Waugh for the implementation of the POSIX.2 `wordexp` function family.
- Ulrich Weigand for various fixes to the PowerPC64 and Arm ports.
- Florian Weimer for his maintainership of the network and dynamic-link components, for handling of security issues, and for numerous fixes and contributions.
- Zack Weinberg for the `explicit_bzero` implementation and for various fixes.
- Mark Wielaard for various fixes.
- Xi Ruoyao for various fixes and work on the loongarch port.
- Qixing ksyx Xue for various fixes.
- Yao Zihong for contributions to the RISC-V port.
- Adam Yi for various fixes.
- Eric Youngdale for implementing versioning of objects on the symbol level.
- YunQiang Su for work on the MIPS port.
- Adhemerval Zanella for optimized functions on PowerPC, ISO C threads support, the work on tunables, fortify improvements, the CORE-MATH integration, thread safety, handling of security issues, and numerous further contributions and fixes.
- Xuelei Zhang for optimized functions on AArch64.
- Junxian Zhu for work on the MIPS and RISC-V port.
- Paul Zimmermann for the extensive work on CORE-MATH, the mathematical functions, and their testsuite.
- Claudiu Zissulescu for work on the SFrame support.

Some code in the GNU C Library comes from other projects and might be under a different license:

- The time zone support code is derived from the public-domain time zone 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 `random`, `srandom`, `setstate` and `initstate`, which are also the basis for the `rand` and `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.
- The `getaddrinfo` and `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 details.
- Code for trigonometric, exponential and related functions in the `sysdeps/ieee754/flt-32` subdirectory is shared with the `CORE-MATH` project with main developers Paul Zimmermann and Alexei Sibidanov, see again the file `LICENSES`.