Comments on: DJGPP on DOSBOX…

By: neozeed

neozeed — Sun, 20 Mar 2016 08:31:26 +0000

In reply to Neil Roy.

for the quake2 port to MS-DOS I just used a cross compiler from OS X to DJGPP, and Win32 to DJGPP. It’s so much faster to run the compiler from an OS that can handle “large” files, or the dozens of includes.

Have you thought about a SDL/modern port?

By: Neil Roy

Neil Roy — Sat, 19 Mar 2016 21:20:22 +0000

I haven’t tried this yet, but back in the day (’90s) I created my first Deluxe Pacman game (http://home.cogeco.ca/~nroy15/games_index.html scroll down and look for v1.02 for DOS if you’re curious) I used DJGPP + Allegro which is really easy to compile under DOS with no dependencies I don’t think. I used to target 386 machines back then and it still runs under DOSBOX to this day. It was optimized at that time with -O2. I will probably set this up and try my hand at recompiling the same project using DOSBOX just for fun. I really don’t see a need to go for the newest GCC out there, not when compiling for DOS. Give Allegro 4 a try anyhow, you can still grab the source for Allegro 4.2 (don’t do a newer version unless you enjoy headaches) and it’s very simple to compile the lib and it has everything you need, sound, input, graphics etc.. ALL my Deluxe Pacman games (1 and now 2) were made with it.

By: Wes Lord

Wes Lord — Tue, 20 Sep 2011 17:51:09 +0000

In reply to Jack.

Thanks a bunch for putting this information out there, Jack. I tried to get DJGPP working in DOSBox a few weeks ago, and ran up against the same problem. I wasn’t able to find any relevant help on Google. I even visited this very page, before you commented, but it never occured to me to try another version of GCC.

Today I decide to tackle the problem again, and Google brings me back here to find a new comment – I followed your advice (with GCC 4.44) and it worked! So again, thanks!

By: Jack

Jack — Sat, 17 Sep 2011 02:26:36 +0000

In reply to Jack. Also, don't forget to get both gcc442b.zip and gpp442b.zip if you are programming in C++...

By: neozeed

neozeed — Sat, 17 Sep 2011 01:56:27 +0000

In reply to Jack.

Hmm Invalid Opcode almost screams that it’s been built to target a higher CPU than what DOSBox emulates… which shouldn’t be that much of a surprise as DOSBox’s primary market is vintage games of the 8086/80286/80386/80486 era…

It may be a matter of rebuilding GCC to target a lower CPU level … or GCC 4.6 has moved beyond 80486/Pentium 1 instructions………

By: Jack

Jack — Sat, 17 Sep 2011 01:51:00 +0000

I wanted to let others know that DOSBox 0.74 with GCC 4.61 does not work, and when compiling the simplest hello world will result in an "Invalid Opcode" SIGILL. I tried many settings, twiddling memory, etc until I simply grabbed the 4.42 version you mentioned above and it worked! Thanks!

By: Anonymous

Anonymous — Mon, 12 Jul 2010 17:30:22 +0000

Hello again,

Thanks for the help.

LFN=NO in autoexec section of dosbox.conf did the trick.

I then renamed the .info files from libc~1.inf (real name libc.info) to libc.inf to get online help in rhide.

Thanks again.

By: Neozeed

Neozeed — Wed, 16 Jun 2010 12:02:00 +0000

Well the big plus DJGPP has is that it'll run on the native filesystem, so I don't have to use DOS edit to edit files… 🙂

Also the f2c thing is part of a long running thing I've been doing on using that on various platforms to see how 'portable' the resulting code is…

What binaries I've collected are here:

http://vpsland.superglobalmegacorp.com/install/f2c/

Also what is the legal issues?

By: Rugxulo

Rugxulo — Wed, 16 Jun 2010 09:38:35 +0000

BTW, you don't have to use f2c, try /v2gnu/gfor442b.zip . And if static linking bothers you (although it shouldn't), use UPX (--best --lzma --all-filters), tweak your libc, use -Os, or try the DJELF hack/port (although UPX doesn't support it). I'm sure DXE/DXE3 works too, but it's probably a pain.

P.S. Yes, FreeDOS-32 exists, stalled for a few years due to license and developer issues. It recently announced work resuming again, so hopes are good. (Or check out RDOS, which now has official OpenWatcom 1.9 support.)

DJGPP and FreeDOS aren't dead, but NTVDM bugs, worse Windows limitations (Vista, 7) and AMD64 incompatibilities (no V86 mode!) don't help. :-/

By: Rugxulo

Rugxulo — Wed, 16 Jun 2010 09:31:42 +0000

DOSBox is the worst choice for compiling with DJGPP. It's not even barely as fast as a 486 (at best! very very very slow!), only geared towards games, and thus it has some bugs preventing "real world" use. (E.g. Last I tried, DOSBox doesn't truncate LFNs correctly to 8.3 when DJGPP looks for files, and that indeed will crash DOSBox.)

If you are running this because your host OS is 64-bit (*shakes fist at no V86 mode*), you'd do *much* much better with VirtualBox or DOSEMU (although sharing files under the former is hard).

Drop by http://www.bttr-software.de/forum if you have HX questions (or just general DOS queries). A fair few of us luddites frequent there.