These is the D compiler frontend for GCC. See below for information
how to obtain the source. The upstream version is at
  http://dgcc.sourceforge.net/

D Frontend to gcc and parts of the runtime libary (phobos):

   Copyright (C) 2004, 2007 David Friedman
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
Digital Mars has kindly licensed the contents of the dmd and dmd2
directories under the GNU General Public License version 1 or above or
the artistic license, this extends the license grant indicated in the
source tarball.
Below is his mail to this end (irrelevant parts edited at [...]).

  Subject: Re: D compiler front end license
  From: Walter Bright [...]
  Date: Wed, 01 Oct 2008 17:55:07 -0700
  Message-ID: <48E41BEB.1040208@digitalmars.com>
  To: Thomas Viehmann <tv@beamnet.de>

  I agree to it. You have my permission to forward it there. Thanks, -Walter Bright

  Thomas Viehmann wrote:
  [...]
  > How about the one below?
  [...]
  > If you could mail the two bugs at 499931@bugs.debian.org,
  > 499927@bugs.debian.org with it (to create a public record), or permit me
  > to forward it there, it would be most helpful.
  [...]
  > ----
  >
  > Digital Mars licenses
  >     The D Programming Language
  >     Compiler Front End Source
  >     Copyright (c) 1999-2008, by Digital Mars
  >
  > as free software; you can redistribute it and/or modify
  > it under the terms of the GNU General Public License as published by
  > the Free Software Foundation; either version 1 of the License, or
  > (at your option) any later version, or alternatively under the Artistic
  > License (distributed with the source as artistic.txt).
  >
  > This program is distributed in the hope that it will be useful,
  > but WITHOUT ANY WARRANTY; without even the implied warranty of
  > MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  > license you choose for details.
  >
  > This grant of license also applies to previously published versions of
  > the D Programming Language Compiler Front End Source.


On Debian GNU/Linux the GNU General Public License systems can be
found in `/usr/share/common-licenses/GPL'.


The D runtime library (phobos) is copyrighted and licensed as follows:

  Copyright (C) 2004-2005 by Digital Mars, www.digitalmars.com
     Written by Walter Bright
  Copyright (C) 2003-2004,2005 by Matthew Wilson and Synesis Software
     Written by Matthew Wilson
  Copyright (C) 2004-2005 by Christopher E. Miller

  This software is provided 'as-is', without any express or implied
  warranty. In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, in both source and binary form, subject to the following
  restrictions:

  o  The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  o  Altered source versions must be plainly marked as such, and must not
     be misrepresented as being the original software.
  o  This notice may not be removed or altered from any source
     distribution.

d/phobos/std/stream.d:
  Copyright (c) 2001-2005
  Pavel "EvilOne" Minayev
   with buffering and endian support added by Ben Hinkle
   with buffered readLine performance improvements by Dave Fladebo
   with opApply inspired by (and mostly copied from) Regan Heath
   with bug fixes and MemoryStream/SliceStream enhancements by Derick Eddington
 
  Permission to use, copy, modify, distribute and sell this software
  and its documentation for any purpose is hereby granted without fee,
  provided that the above copyright notice appear in all copies and
  that both that copyright notice and this permission notice appear
  in supporting documentation.  Author makes no representations about
  the suitability of this software for any purpose. It is provided
  "as is" without express or implied warranty.

Several files of the phobos library have been put in the public domain
by their authors.

In the tarball d/phobos/etc/c/zlib, a copy of zlib is included with
the following copyright and license:

  Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler
  
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.
  
  Permission is granted to anyone to use this software for any
  purpose, including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:
    
  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.

  Jean-loup Gailly        Mark Adler
  jloup@gzip.org          madler@alumni.caltech.edu


Here is general information about the source added by the packager:

This is the Debian GNU/Linux prepackaged version of the GNU compiler
collection, containing Ada, C, C++, Fortran 95, Java, Objective-C,
Objective-C++, and Treelang compilers, documentation, and support
libraries.  In addition, Debian provides the GNU Pascal compiler in the
same source package.  Packaging is done by the Debian GCC Maintainers
<debian-gcc@lists.debian.org>, with sources obtained from:

  ftp://gcc.gnu.org/pub/gcc/releases/  (for full releases)
  svn://gcc.gnu.org/svn/gcc/           (for prereleases)
  http://gnu-pascal.de/alpha/          (for GNU Pascal)
  http://dgcc.sourceforge.net/         (for D)

Changes: See changelog.Debian.gz

Debian splits the GNU Compiler Collection into packages for each language,
library, and documentation as follows:

Language       Compiler package  Library package    Documentation
---------------------------------------------------------------------------
Ada            gnat-4.1          libgnat-4.1        gnat-4.1-doc
C              gcc-4.1                              gcc-4.1-doc
C++            g++-4.1           libstdc++6         libstdc++6-4.1-doc
Fortran 95     gfortran-4.1      libgfortran1       gfortran-4.1-doc
Java           gcj-4.1           libgcj7            libgcj-doc
Objective C    gobjc-4.1         libobjc1
Objective C++  gobjc++-4.1
Pascal         gpc-4.1
D              gdc-4.1
Treelang       treelang-4.1

For some language run-time libraries, Debian provides source files,
development files, debugging symbols and libraries containing position-
independent code in separate packages:

Language  Sources     Development  Debugging           Position-Independent
---------------------------------------------------------------------------
C++                                libstdc++6-4.1-dbg  libstdc++6-4.1-pic
Java      libgcj7-src libgcj7-dev  libgcj7-dbg

Additional packages include:

All languages:
libgcc1, libgcc2, libgcc4       GCC intrinsics (platform-dependent)
libffi4-dev, libffi4            Foreign Function Interface library
gcc-4.1-base                    Base files common to all compilers
gcc-4.1-soft-float              Software floating point (ARM only)
gcc-4.1-source                  The sources with patches

Ada:
libgnatvsn-dev, libgnatvsn4.1   GNAT version library
libgnatprj-dev, libgnatprj4.1   GNAT Project Manager library

C:
cpp-4.1, cpp-4.1-doc            GNU C Preprocessor
libmudflap0-dev, libmudflap0    Library for instrumenting pointers
libssp0-dev, libssp0            GCC stack smashing protection library
fixincludes                     Fix non-ANSI header files
protoize                        Create/remove ANSI prototypes from C code

Java:
fastjar                         Jar creation utility
gij                             The Java bytecode interpreter and VM
libgcj-common                   Common files for the Java run-time
libgcj7-awt                     The Abstract Windowing Toolkit
libgcj7-jar                     Java ARchive for the Java run-time

Biarch support: On some 64-bit platforms which can also run 32-bit code,
Debian provides additional packages containing 32-bit versions of some
libraries.  These packages have names beginning with 'lib32' instead of
'lib', for example lib32stdc++6.  Similarly, on some 32-bit platforms which
can also run 64-bit code, Debian provides additional packages with names
beginning with 'lib64' instead of 'lib'.  These packages contain 64-bit
versions of the libraries.  (At this time, not all platforms and not all
libraries support biarch.)  The license terms for these lib32 or lib64
packages are identical to the ones for the lib packages.


COPYRIGHT STATEMENTS AND LICENSING TERMS


GCC is Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
Free Software Foundation, Inc.

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

On Debian GNU/Linux systems, the complete text of the GNU General
Public License is in `/usr/share/common-licenses/GPL'.

The libstdc++-v3 library is licensed under the terms of the GNU General
Public License, with this special exception:

   As a special exception, you may use this file as part of a free software
   library without restriction.  Specifically, if other files instantiate
   templates or use macros or inline functions from this file, or you compile
   this file and link it with other files to produce an executable, this
   file does not by itself cause the resulting executable to be covered by
   the GNU General Public License.  This exception does not however
   invalidate any other reasons why the executable file might be covered by
   the GNU General Public License.

The libgnat-4.1 Ada support library and libgnatvsn are licensed under the
terms of the GNU General Public License, with this special exception:

   As a special exception, if other files instantiate generics from this
   unit, or you link this unit with other files to produce an executable,
   this unit does not by itself cause the resulting executable to be
   covered by the GNU General Public License. This exception does not
   however invalidate any other reasons why the executable file might be
   covered by the GNU Public License.

In contrast, libgnatprj is licensed under the terms of the pure GNU
General Public License.

gpc is copyright Free Software Foundation, and is licensed under the
GNU General Public License which on Debian GNU/Linux systems can be
found as `/usr/share/common-licenses/GPL3'.

The gpc runtime library is licensed under the terms of the GNU General
Public License, with this special exception:

  As a special exception, if you link this file with files compiled
  with a GNU compiler to produce an executable, this does not cause
  the resulting executable to be covered by the GNU General Public
  License. This exception does not however invalidate any other
  reasons why the executable file might be covered by the GNU
  General Public License. }

The libgcj library is licensed under the terms of the GNU General
Public License, with a special exception:

    Linking this library statically or dynamically with other modules
    is making a combined work based on this library.  Thus, the terms
    and conditions of the GNU General Public License cover the whole
    combination.

    As a special exception, the copyright holders of this library give
    you permission to link this library with independent modules to
    produce an executable, regardless of the license terms of these
    independent modules, and to copy and distribute the resulting
    executable under terms of your choice, provided that you also
    meet, for each linked independent module, the terms and conditions
    of the license of that module.  An independent module is a module
    which is not derived from or based on this library.  If you modify
    this library, you may extend this exception to your version of the
    library, but you are not obligated to do so.  If you do not wish
    to do so, delete this exception statement from your version.

gcc/libgcc2.c (source for libgcc) has the following addition:

    In addition to the permissions in the GNU General Public License,
    the Free Software Foundation gives you unlimited permission to
    link the compiled version of this file into combinations with
    other programs, and to distribute those combinations without any
    restriction coming from the use of this file.  (The General Public
    License restrictions do apply in other respects; for example, they
    cover modification of the file, and distribution when not linked
    into a combine executable.)

gcc/unwind-libunwind.c (source for libgcc) has the following addition:

    As a special exception, if you link this library with other files,
    some of which are compiled with GCC, to produce an executable,
    this library does not by itself cause the resulting executable to
    be covered by the GNU General Public License.  This exception does
    not however invalidate any other reasons why the executable file
    might be covered by the GNU General Public License.

The mudflap library is licensed under the terms of the GNU General
Public License, and has the following addition:

    In addition to the permissions in the GNU General Public License,
    the Free Software Foundation gives you unlimited permission to
    link the compiled version of this file into combinations with
    other programs, and to distribute those combinations without any
    restriction coming from the use of this file.  (The General Public
    License restrictions do apply in other respects; for example, they
    cover modification of the file, and distribution when not linked
    into a combine executable.)

The ssp library is licensed under the terms of the GNU General
Public License, with a special exception:

    As a special exception, if you link this library with other files,
    some of which are compiled with GCC, to produce an executable,
    this library does not by itself cause the resulting executable to
    be covered by the GNU General Public License.  This exception does
    not however invalidate any other reasons why the executable file
    might be covered by the GNU General Public License.


The documentation is licensed under the GNU Free Documentation License
(v1.2), appended at the end of this file.
On Debian GNU/Linux systems the GNU Free Documentation License version 1.2
can be found in /usr/share/common-licenses/GFDL-1.2.
