Info on DJGPP


DJGPP is the GNU GCC compiler for MS-DOS. It includes it's own 32-bit
DOS Extender, allowing it to invisibly use *ALL* available
memory, of any kind (including virtual memory) that your DPMI-capable
memory manager can support. Most memory managers these days *do*
support DPMI, but a free one from the DJGPP project can be found in the
links below....

Since there are MANY download sights, and the TNOS crowd is an
international bunch, the info below will be pathname2 to the
various components, relative to the base directory on the machine you
use (simtel or one of its many mirrors).

The home page for DJGPP is http://www.delorie.com/djgpp, and
is a useful site, but not necessary. To get DJGPP, you will need to
either go to the Simtel site at
ftp://ftp.simtel.net/pub/simtelnet/gnu/vendors/djgpp,
or one of its mirrors sites. See the file 'mirrors.dj' for the locations
of the Simtel mirrors. Simtel is a VERY busy site, so you would probably
be wise to use a mirror site....

Once on a destination FTP site you will want one or more of the following:


 * For just *running* TNOS under DJGPP

  To run TNOS under DJGPP, you only need a DPMI-compatible memory manager.
  If you need one, you will want to get:

	* v2/readme.1st

          This explains how to install DJGPP and get started with using it.

	* v2/faq201b.zip

          The latest edition of this FAQ list.  Use it whenever you have
          problems installing and using DJGPP.
 
	* v2misc/csdpmi2b.zip

          CWSDPMI, the DJGPP free DPMI server.  (If you can get DPMI services
          in your environment, like if you run under Windows, or QDPMI, or
          OS/2, you don't need CWSDPMI, but I recommend to download it
          nonetheless, so you can try it in case you have trouble with other
          DPMI servers.)


 * For *compiling* TNOS

  To compile TNOS (or other programs) under DJGPP, you MUST download all
  of the above, plus the following:

	* v2gnu/bnu252b.zip

          The GNU Binutils, including `as', the GNU assembler, and `ld', the
          GNU linker, and their docs.

	* v2/djdev200.zip

          C header files, minimal development environment, DJGPP-specific
          utilities and documentation.

	* v2/djtst200.zip

          A set of example programs to test your installation.

	* v2gnu/gcc272b.zip

          The GNU C Compiler binaries and docs (including the docs for the C++
          compiler).

	* v2gnu/txi360b.zip

          Info, a stand-alone program to read GNU hypertext documentation
          files, and an environment to produce such files.  Without `info',
          you cannot read the docs included with the GNU software tools.

	* v2gnu/mak373b.zip

               GNU Make program with its docs.
 

 * For *Debugging* TNOS under DJGPP

	* v2gnu/gdb412b.zip

               GDB, the GNU Debugger and its docs.  (Note that the `djdev'
               distribution includes two simpler debuggers, `edebug' and
               `fsdb.'  The latter presents a user interface similar to that
               of Turbo Debugger.)



There are many other applications out there, as well as the C++ portions
of DJGPP. Read the DJGPP FAQ (Section 4.5) for a complete list, or just
poke around on the archive.


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For Linux cross-DJGPP development (compiling MSDOS DJGPP programs from the
Linux kernel, without needing to go into the Dos Emulator), you will
want to get *ALL* of the following, available via ftp at sunsite.unc.edu
in the /pub/Linux/devel/msdos directory:

	* The cross-compiler - gcc-2.7.2.go32.tar.gz

	* The compiler's include files - djdev200.go32.tar.gz

	* The various support utilities - binutils-2.7.go32.tar.gz
	  (like the assembler, linker, etc.)


To cross-compile a DJGPP MSDOS executable under Linux, you just
do a 'make dos'. Also, a 'make tnos.exe' does the same but also strips out
the symbolic debugging info, making a MUCH smaller disk file.