To be more explicit, a text mode windows program is not a DOS program. It will do anything useful on a DOS system without windows.
If you desire 32-bit protected mode DOS programs, DJGPP may be your best option. New builds of DJGPP are available at http://www.delorie.com/djgpp/ . I'm not sure if the current binaries run correctly under cygwin as they are programs that run under a DOS extender. They used to work under Windows and OS/2, but it's been a while since I tried them on a recent version of Windows. If you need 16-bit real mode or 16-bit protected mode DOS binaries, OpenWatcom is an option. (It can also do 32-bit binaries, but if you are compiling code meant for GCC, DJGPP may be the better option). You can find it at https://github.com/open-watcom/open-watcom-v2 . OpenWatcom is included in distributions of FreeDOS. On Sat, May 31, 2025 at 10:50 AM Lee via Cygwin <cygwin@cygwin.com> wrote: > On Sat, May 31, 2025 at 11:16 AM Jon Turney via Cygwin > <cygwin@cygwin.com> wrote: > > > > On 31/05/2025 01:33, Takashi Yano via Cygwin wrote: > > > On Sat, 31 May 2025 09:00:10 +0900 > > > Takashi Yano wrote: > > >> On Sat, 31 May 2025 00:39:24 +0200 > > >> Dan Shelton wrote: > > >>> Hello! > > >>> > > >>> Does Cygwin have a compiler which allows compiling ISO C applications > > >>> as DOS *.exe? > > > > Actually, we do have a package for an (old) version of djgpp, which I > > believe targets DOS executables. > > At this point I'm pretty much a cargo-cult programmer, but for > whatever it's worth > > i686-w64-mingw32-gcc > will build a non-gui *.exe program - which is a dos program, yes? > > and for a windows program: > > if test $target_type = mingw; then > WIN_ONLY= > CFLAGS="$CFLAGS -DWINVER=0x501" > SPECIAL_CFLAGS="-mwindows" > dnl from the cygwin FAQ: The regular setup allows you to use the > -mwindows option > dnl to include a set of the basic libraries user32, gdi32 and comdlg32. > dnl (and also make your program a GUI program instead of a console program) > PTHREAD_LIB=-lpthread > echo "Using mingw32 (Win32 GUI)" > else > > Regards, > Lee > > -- > Problem reports: https://cygwin.com/problems.html > FAQ: https://cygwin.com/faq/ > Documentation: https://cygwin.com/docs.html > Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple > -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
