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<a name="Contributors"></a>
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<a name="Contributors-to-GDB"></a>
<h3 class="unnumberedsec">Contributors to <small>GDB</small></h3>

<p>Richard Stallman was the original author of <small>GDB</small>, and of many
other <small>GNU</small> programs.  Many others have contributed to its
development.  This section attempts to credit major contributors.  One
of the virtues of free software is that everyone is free to contribute
to it; with regret, we cannot actually acknowledge everyone here.  The
file <samp>ChangeLog</samp> in the <small>GDB</small> distribution approximates a
blow-by-blow account.
</p>
<p>Changes much prior to version 2.0 are lost in the mists of time.
</p>
<blockquote>
<p><em>Plea:</em> Additions to this section are particularly welcome.  If you
or your friends (or enemies, to be evenhanded) have been unfairly
omitted from this list, we would like to add your names!
</p></blockquote>

<p>So that they may not regard their many labors as thankless, we
particularly thank those who shepherded <small>GDB</small> through major
releases:
Andrew Cagney (releases 6.3, 6.2, 6.1, 6.0, 5.3, 5.2, 5.1 and 5.0);
Jim Blandy (release 4.18);
Jason Molenda (release 4.17);
Stan Shebs (release 4.14);
Fred Fish (releases 4.16, 4.15, 4.13, 4.12, 4.11, 4.10, and 4.9);
Stu Grossman and John Gilmore (releases 4.8, 4.7, 4.6, 4.5, and 4.4);
John Gilmore (releases 4.3, 4.2, 4.1, 4.0, and 3.9);
Jim Kingdon (releases 3.5, 3.4, and 3.3);
and Randy Smith (releases 3.2, 3.1, and 3.0).
</p>
<p>Richard Stallman, assisted at various times by Peter TerMaat, Chris
Hanson, and Richard Mlynarik, handled releases through 2.8.
</p>
<p>Michael Tiemann is the author of most of the <small>GNU</small> C<tt>++</tt> support
in <small>GDB</small>, with significant additional contributions from Per
Bothner and Daniel Berlin.  James Clark wrote the <small>GNU</small> C<tt>++</tt>
demangler.  Early work on C<tt>++</tt> was by Peter TerMaat (who also did
much general update work leading to release 3.0).
</p>
<p><small>GDB</small> uses the BFD subroutine library to examine multiple
object-file formats; BFD was a joint project of David V.
Henkel-Wallace, Rich Pixley, Steve Chamberlain, and John Gilmore.
</p>
<p>David Johnson wrote the original COFF support; Pace Willison did
the original support for encapsulated COFF.
</p>
<p>Brent Benson of Harris Computer Systems contributed DWARF 2 support.
</p>
<p>Adam de Boor and Bradley Davis contributed the ISI Optimum V support.
Per Bothner, Noboyuki Hikichi, and Alessandro Forin contributed MIPS
support.
Jean-Daniel Fekete contributed Sun 386i support.
Chris Hanson improved the HP9000 support.
Noboyuki Hikichi and Tomoyuki Hasei contributed Sony/News OS 3 support.
David Johnson contributed Encore Umax support.
Jyrki Kuoppala contributed Altos 3068 support.
Jeff Law contributed HP PA and SOM support.
Keith Packard contributed NS32K support.
Doug Rabson contributed Acorn Risc Machine support.
Bob Rusk contributed Harris Nighthawk CX-UX support.
Chris Smith contributed Convex support (and Fortran debugging).
Jonathan Stone contributed Pyramid support.
Michael Tiemann contributed SPARC support.
Tim Tucker contributed support for the Gould NP1 and Gould Powernode.
Pace Willison contributed Intel 386 support.
Jay Vosburgh contributed Symmetry support.
Marko Mlinar contributed OpenRISC 1000 support.
</p>
<p>Andreas Schwab contributed M68K <small>GNU</small>/Linux support.
</p>
<p>Rich Schaefer and Peter Schauer helped with support of SunOS shared
libraries.
</p>
<p>Jay Fenlason and Roland McGrath ensured that <small>GDB</small> and GAS agree
about several machine instruction sets.
</p>
<p>Patrick Duval, Ted Goldstein, Vikram Koka and Glenn Engel helped develop
remote debugging.  Intel Corporation, Wind River Systems, AMD, and ARM
contributed remote debugging modules for the i960, VxWorks, A29K UDI,
and RDI targets, respectively.
</p>
<p>Brian Fox is the author of the readline libraries providing
command-line editing and command history.
</p>
<p>Andrew Beers of SUNY Buffalo wrote the language-switching code, the
Modula-2 support, and contributed the Languages chapter of this manual.
</p>
<p>Fred Fish wrote most of the support for Unix System Vr4.
He also enhanced the command-completion support to cover C<tt>++</tt> overloaded
symbols.
</p>
<p>Hitachi America (now Renesas America), Ltd. sponsored the support for
H8/300, H8/500, and Super-H processors.
</p>
<p>NEC sponsored the support for the v850, Vr4xxx, and Vr5xxx processors.
</p>
<p>Mitsubishi (now Renesas) sponsored the support for D10V, D30V, and M32R/D
processors.
</p>
<p>Toshiba sponsored the support for the TX39 Mips processor.
</p>
<p>Matsushita sponsored the support for the MN10200 and MN10300 processors.
</p>
<p>Fujitsu sponsored the support for SPARClite and FR30 processors.
</p>
<p>Kung Hsu, Jeff Law, and Rick Sladkey added support for hardware
watchpoints.
</p>
<p>Michael Snyder added support for tracepoints.
</p>
<p>Stu Grossman wrote gdbserver.
</p>
<p>Jim Kingdon, Peter Schauer, Ian Taylor, and Stu Grossman made
nearly innumerable bug fixes and cleanups throughout <small>GDB</small>.
</p>
<p>The following people at the Hewlett-Packard Company contributed
support for the PA-RISC 2.0 architecture, HP-UX 10.20, 10.30, and 11.0
(narrow mode), HP&rsquo;s implementation of kernel threads, HP&rsquo;s aC<tt>++</tt>
compiler, and the Text User Interface (nee Terminal User Interface):
Ben Krepp, Richard Title, John Bishop, Susan Macchia, Kathy Mann,
Satish Pai, India Paul, Steve Rehrauer, and Elena Zannoni.  Kim Haase
provided HP-specific information in this manual.
</p>
<p>DJ Delorie ported <small>GDB</small> to MS-DOS, for the DJGPP project.
Robert Hoehne made significant contributions to the DJGPP port.
</p>
<p>Cygnus Solutions has sponsored <small>GDB</small> maintenance and much of its
development since 1991.  Cygnus engineers who have worked on <small>GDB</small>
fulltime include Mark Alexander, Jim Blandy, Per Bothner, Kevin
Buettner, Edith Epstein, Chris Faylor, Fred Fish, Martin Hunt, Jim
Ingham, John Gilmore, Stu Grossman, Kung Hsu, Jim Kingdon, John Metzler,
Fernando Nasser, Geoffrey Noer, Dawn Perchik, Rich Pixley, Zdenek
Radouch, Keith Seitz, Stan Shebs, David Taylor, and Elena Zannoni.  In
addition, Dave Brolley, Ian Carmichael, Steve Chamberlain, Nick Clifton,
JT Conklin, Stan Cox, DJ Delorie, Ulrich Drepper, Frank Eigler, Doug
Evans, Sean Fagan, David Henkel-Wallace, Richard Henderson, Jeff
Holcomb, Jeff Law, Jim Lemke, Tom Lord, Bob Manson, Michael Meissner,
Jason Merrill, Catherine Moore, Drew Moseley, Ken Raeburn, Gavin
Romig-Koch, Rob Savoye, Jamie Smith, Mike Stump, Ian Taylor, Angela
Thomas, Michael Tiemann, Tom Tromey, Ron Unrau, Jim Wilson, and David
Zuhn have made contributions both large and small.
</p>
<p>Andrew Cagney, Fernando Nasser, and Elena Zannoni, while working for
Cygnus Solutions, implemented the original <small>GDB/MI</small> interface.
</p>
<p>Jim Blandy added support for preprocessor macros, while working for Red
Hat.
</p>
<p>Andrew Cagney designed <small>GDB</small>&rsquo;s architecture vector.  Many
people including Andrew Cagney, Stephane Carrez, Randolph Chung, Nick
Duffek, Richard Henderson, Mark Kettenis, Grace Sainsbury, Kei
Sakamoto, Yoshinori Sato, Michael Snyder, Andreas Schwab, Jason
Thorpe, Corinna Vinschen, Ulrich Weigand, and Elena Zannoni, helped
with the migration of old architectures to this new framework.
</p>
<p>Andrew Cagney completely re-designed and re-implemented <small>GDB</small>&rsquo;s
unwinder framework, this consisting of a fresh new design featuring
frame IDs, independent frame sniffers, and the sentinel frame.  Mark
Kettenis implemented the <small>DWARF 2</small> unwinder, Jeff Johnston the
libunwind unwinder, and Andrew Cagney the dummy, sentinel, tramp, and
trad unwinders.  The architecture-specific changes, each involving a
complete rewrite of the architecture&rsquo;s frame code, were carried out by
Jim Blandy, Joel Brobecker, Kevin Buettner, Andrew Cagney, Stephane
Carrez, Randolph Chung, Orjan Friberg, Richard Henderson, Daniel
Jacobowitz, Jeff Johnston, Mark Kettenis, Theodore A. Roth, Kei
Sakamoto, Yoshinori Sato, Michael Snyder, Corinna Vinschen, and Ulrich
Weigand.
</p>
<p>Christian Zankel, Ross Morley, Bob Wilson, and Maxim Grigoriev from
Tensilica, Inc. contributed support for Xtensa processors.  Others
who have worked on the Xtensa port of <small>GDB</small> in the past include
Steve Tjiang, John Newlin, and Scott Foehner.
</p>
<p>Michael Eager and staff of Xilinx, Inc., contributed support for the
Xilinx MicroBlaze architecture.
</p>
<p>Initial support for the FreeBSD/mips target and native configuration
was developed by SRI International and the University of Cambridge
Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
(&quot;CTSRD&quot;), as part of the DARPA CRASH research programme.
</p>
<p>Initial support for the FreeBSD/riscv target and native configuration
was developed by SRI International and the University of Cambridge
Computer Laboratory (Department of Computer Science and Technology)
under DARPA contract HR0011-18-C-0016 (&quot;ECATS&quot;), as part of the DARPA
SSITH research programme.
</p>
<p>The original port to the OpenRISC 1000 is believed to be due to
Alessandro Forin and Per Bothner.  More recent ports have been the work
of Jeremy Bennett, Franck Jullien, Stefan Wallentowitz and
Stafford Horne.
</p>
<p>Weimin Pan, David Faust and Jose E. Marchesi contributed support for
the Linux kernel BPF virtual architecture.  This work was sponsored by
Oracle.
</p>
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