This is the README.1ST file for DJGPP Version 2.00

DJGPP v2.0 is a free environment for developing 32-bit protected mode
software in C/C++ under MS-DOS.

Status and other information (online docs, FAQ, mail archives) are
made available through the djgpp web pages at http://www.delorie.com/.
Discussion of DJGPP and questions about its usage or features are
through the djgpp news group (post to comp.os.msdos.djgpp) and djgpp
mailing list (send your messages to <djgpp@delorie.com>, subscribe
through <listserv@delorie.com>).  Look on the web page for information
on the latest versions of various DJGPP packages.

Version information is in manifest/*.ver within each zip.  Contents
are in manifest/*.mft in each zip.

A different, more complete (and longer) tutorial on how to get started
with DJGPP was written by An <avly@remus.rutgers.edu> and is available
by anonymous ftp from x2ftp.oulu.fi in the
/pub/msdos/programming/djgpp2 directory, filename djtut-bm.zip.  You
can also read it on-line by pointing your Web browser to this URL:

	http://remus.rutgers.edu/~avly/djgpp.html



THE DISTRIBUTION
****************

The 'b' zips include the binaries and on-line documentation.  At the
time of writing this file, the various packages are:

FAQ      A short file which points you to other documents you should
           read (including the full FAQ list).

v2/
unzip386 A free program to unzip the archive (like PKUNZIP) 
djdev200 DJGPP V2 Development Kit and Runtime
djlsr200 DJGPP V2 Base Library Sources
djtst200 DJGPP V2 Test Programs
djcrx200 DJGPP V2 For Building a Cross-to-DOS Compiler
faq200b  The full FAQ list in various formats (Info, ASCII, HTML...)
faq200s  The Texinfo sources of the FAQ and tools to generate all the
          different formats of the FAQ

v2gnu/
bnu252b  GNU binutils 2.5.2 for DJGPP V2
bnu252s  GNU binutils 2.5.2 sources
bsn124b  GNU bison 1.24 for DJGPP V2
bsn124s  GNU bison 1.24 sources
dif271b  GNU diffutils 2.7.1 for DJGPP V2
dif271s  GNU diffutils 2.7.1 sources
find41b  GNU findutils 4.1 for DJGPP V2
find41s  GNU findutils 4.1 sources
flx252b  GNU Flex 2.5.2 for DJGPP V2
flx252s  GNU Flex 2.5.2 sources
gcc272b  GNU GCC 2.7.2 for DJGPP V2
gcc272s  GNU GCC 2.7.2 sources
gdb412b  GNU Debugger 4.12 for DJGPP V2
gdb412s  GNU Debugger 4.12 sources
gpp272b  GNU G++ 2.7.2 for DJGPP V2 (no libs)
grep20b  GNU grep 2.0 for DJGPP V2
grep20s  GNU grep 2.0 sources
gzp124b  GNU gzip 1.2.4 for DJGPP V2
gzp124s  GNU gzip 1.2.4 sources
lgp271b  GNU libg++ 2.7.1 for DJGPP V2
lgp271s  GNU libg++ 2.7.1 sources
mak373b  GNU Make 3.73 for DJGPP V2
mak373s  GNU Make 3.73 sources
obc272b  GNU ObjC 2.7.2 for DJGPP V2
pat21b   GNU patch 2.1 for DJGPP V2
pat21s   GNU patch 2.1 sources
sed118b  GNU sed 1.18 for DJGPP V2
sed118s  GNU sed 1.18 sources
txi360b  GNU texinfo 3.6 for DJGPP V2
txi360s  GNU texinfo 3.6 sources

v2tk/
bcc2grx  Borland GUI to GRX interface for DJGPP V2
grx20    GRX 2.0 Graphics Library for DJGPP V2
pdc22    Public-domain Curses library

v2misc/
csdpmi1b CWSDPMI, Charles Sandmann's free DPMI server binaries and docs
csdpmi1s CWSDPMI sources
csdpmi1p Parameter-tuning program for CWSDPMI
wmemu2b  WM's 387 emulator binaries for DJGPP V2
wmemu2s  WM's 387 emulator sources for DJGPP V2



GETTING STARTED
***************

The info below is the minimum new users should know to get them up and
running with DJGPP.  Please read the DJGPP documentation and the FAQ
list for further details.  New users are encouraged to read the FAQ
list in its entirety.



What to download
----------------

In general, download the binary distributions only; most of the people
don't need the source distributions.

To build C programs, you'll need djdev200.zip, gcc272b.zip, and
bnu252b.zip.  For C++, also get gpp272b.zip and lgp271b.zip.  To read
the online manuals, get txi360b.zip and run "info".  If you don't have
a DPMI server installed, you'll need csdpmi1b.zip.  (Windows, QDPMI,
386Max, NWDOS, OS/2, Win/NT and Linux DOSEmu all provide DPMI
services, so you don't need CWSDPMI in those environments.)  For more
details, download either faq200b.zip and read Chapter 4 of the FAQ.


Installation
------------

1. Create a directory for DJGPP, say C:\DJGPP.  If you have version
   1.x installed, it's best to delete the contents of its `bin/'
   subdirectory or move it to another directory (not on your PATH),
   and delete everything else from that installation.  (Some of the
   problems reported by users of DJGPP v2 were caused by inadvertently
   mixing it with old v1.x programs.)  The only program from v1.x that
   you should keep is `go32.exe'.

2. Unzip the zip files from that directory, preserving the directory
   structure.  For example:

	pkunzip -d gcc272b
  or
	unzip386 gcc272b

3. After unzipping all the zip files in, set the DJGPP environment
   variable to point to the file DJGPP.ENV in the main DJGPP
   installation directory and add its BIN subdirectory to your PATH.
   Assuming your DJGPP installation is rooted at C:\DJGPP, put these
   two lines into your autoexec.bat file:

	set DJGPP=C:\DJGPP\DJGPP.ENV
	set PATH=C:\DJGPP\BIN;%PATH%

4. Run the go32-v2.exe program without arguments:

	go32-v2

   It should report how much DPMI memory and swap space can DJGPP use
   on you system, like this:

	DPMI memory available: 8020 Kb
	DPMI swap space available: 240 Kb

   (The actual numbers will vary according to amount of RAM installed
   on your system, the available disk space and the DPMI server.)  If
   go32-v2 reports less than 4 MBytes of DPMI memory, read section 3.8
   of the FAQ.  (If you have more than that, but want to get the
   optimal performance from your system, read that section anyway.)


Compilation
-----------

GCC is a command-line compiler, which you invoke from DOS command
line.  To compile and link a single-file C program, use a command like
this:

	gcc myfile.c -o myfile.exe -lm

The -lm links in the lib/libm.a library (trig math) if needed.  (Link
order is significant, so always put `-lm' at the end of the command
line.)

To compile a C or C++ source file into an object file, use this
command line:

	gcc -c -Wall myfile.c  (for C source)
  or
	gcc -c -Wall myfile.cc (for C++ source)

This produces the object file myfile.o.  The `-Wall' switch turns on
many useful warning messages which is especially beneficial for new
users of GCC.  (Other C++ extensions, like .cpp, are also supported,
see section 8.4 of the FAQ for details.)

To link several C object files into an executable program, use a
command line such as this:

	gcc -o myprog.exe mymain.o mysub1.o mysub2.o -lm

This produces `myprog.exe' which can be run from the DOS prompt.

To link a C++ program, use gxx instead of gcc, like this:

	gxx -o myprog.exe mymain.o mysub1.o mysub2.o -lm

This will automatically search the C++ libraries, so you won't need to
mention them on the command line.

You can also combine the compilation and link steps, like this:

	gcc -Wall -o myprog.exe mymain.c mysub1.c mysub2.c -lm

Further info about the plethora of GCC switches can be found in the
GCC on-line documentation.  To begin reading it, install the Texinfo
package (txi360b.zip, see the ``On-line docs'' section below) and type
this:

	info gcc invoking



Development environment (aka IDE)
---------------------------------

DJGPP doesn't come with an integrated development environment of its
own.  (That might change, if you decide to sit down and write such a
program, then donate it to DJGPP.)  You are free to choose any editor,
that can launch DOS programs and catch their output, to act as an
IDE.  Many people who work with DJGPP use a DOS port of GNU Emacs
(it's available on SimTel mirrors) which can be compiled with DJGPP.
Emacs is a very powerful editor (for example, it has a built-in Info
reader, so you can read DJGPP documentation without leaving the
editor), but many other free editors can serve as an IDE.  The only
task that these editors (including Emacs) cannot do is to run a
debugger in a full-screen session.



Debugging
---------

To debug a program, you must first compile its source files with `-g'
switch:

	gcc -c -Wall -g mymain.c
	gcc -c -Wall -g mysub1.c
	gcc -c -Wall -g mysub2.c

and then link with `-g', but give the linker the name of the output
file with no .exe extension:

	gcc -g -o myprog mymain.o mysub1.o mysub2.o -lm

(note the `-o myprog' as opposed to `-o myprog.exe').  This will
produce the COFF output named `myprog' as well as the DOS executable
`myprog.exe'; debuggers need the COFF binary.

Then run your program under the debugger:

	fsdb myprog
or
	gdb myprog

(You will have to get gdb412b.zip if you want to debug with GDB.)
FSDB has its help screen; press F1 to read it.  GDB comes with Info
docs (see below) which can be read with info.exe.



On-line docs
------------

Most of the on-line documentation is organized in a special hypertext
format used by the GNU project.  Each package brings its docs which
are files with .iNN extension and are unzipped into the info/
subdirectory of your main DJGPP installation directory.  To browse
these docs, get and unzip the file txi360b.zip, then run info.exe.  If
you don't know how to use Info, press `?'.



Compatibility with V1.x
-----------------------

Existing binaries compiled under DJGPP V1.x can be used for
applications for which there is no v2.0 version.  V1 programs cannot
run V2 programs (but v2 programs *can* run v1 programs), so don't try,
say, using v1.x Make to run v2.0 compiler.




--- COPYRIGHT ---

DJGPP V2 is Copyright (C) 1995 by DJ Delorie.  Some parts of libc.a
are Copyright (C) Regents of the University of California at Berkeley.

GNU software (gcc, make, libg++, etc) is Copyright by the Free
Software Foundation.

DJGPP V2's copyright allows it to be used to produce commercial
applications.  However, if you include code or libraries that are not
part of djgpp (like gnu's libg++) then you must comply with their
copyrights.  See Chapter 19 of the FAQ for more details.


Enjoy!


DJ Delorie
dj@delorie.com
http://www.delorie.com/
