Re: Aw: Re: Do we still need MSDOS support?

[Ethan A M. <sf...@us...>]

On Wednesday, April 4, 2018 11:19:18 PM PDT Bastian Märkisch wrote:
> > Gesendet: Donnerstag, 05. April 2018 um 00:23 Uhr
> > Am 04.04.2018 um 22:47 schrieb Ethan A Merritt via gnuplot-beta:
> > > 
> > > I thought that MSDOS referred to 16-bit legacy code that we
> > > no longer support.  Maybe I am mistaken.
> > 
> > You are, kinda.  MSDOS refers to the operating system, but not 
> > necessarily in its original 16-bit incarnation.  We still do carry 
> > support for DJGPP, which is a 32-bit target working on top of MSDOS.  It 
> > has suffered some bit-rot since I last tried to build it, but it should 
> > still be viable.
> 
> A few months ago I was asking myself if gnuplot could still be 
> compiled on MSDOS. Here are my findings:
> 
> In fact there are (at least) three 32bit MSDOS compilers which were 
> used in the past:
> DJGPP:  Still under active development, POSIX, gcc 7.2 available, 
>    as well as cross-compilers
> OpenWatcom:  Development stale/slowed down, also supported for 
>    gnuplot on Windows
> EMX:  Used on DOS and OS/2, so removing support for it might break
>    OS/2, too (Petr?)

Petr:

Are you still building gnuplot on OS/2?
What toolset[s] are needed for that?

In particular I am wondering if the __EMX__ conditional code and the
emxvga.trm driver can be removed.  

The EMX project web page seems to show that the most recent
supported gcc is 3.0.4 (from 2002).  I suspect that if we move to
requiring a compiler that accepts C99 syntax that version is too old.

What are your thoughts?

	Ethan