[fpc-pascal] FPC 2.6.2 for DOS/Go32V2 FP.EXE cannot run a second time

[Lubomír Čabla]

I am running pure DOS 7 from Windows 98 US, no drivers, no TSR programs.
Just COMMAND.COM, no AUTOEXEC.BAT and CONFIG.SYS.

Run

CWSDPMI -p -x

DPMI stays in memory, start FP.EXE - again SIGSEGV.

But I found an interesting thing.

When I run FP.EXE from FPC 1.0.11 (it started always O.K.),
nothing done, just exit program,
and then try run IDE from FPC 2.6.2 - the program starts!

*Further attempts to start IDE from FPC 2.6.2 causes an exception SIGSEV.*
*
*
*If previously run IDE from FPC 1.0.11, then IDE from FPC 2.6.2 starts.*

It is really funny...

Can you tell me where can I download source for IDE from FPC 2.6.2
and how to compile it?

I will try it when I have a free weekend.

Thank you.



On Wed, Sep 18, 2013 at 8:52 AM, Tomas Hajny <XHajT03 at hajny.biz> wrote:

> On Tue, September 17, 2013 20:57, Lubomír Čabla wrote:
> > FPC 2.6.2 for DOS/Go32V2
> >
> > There is the fatal IDE unstability in FPC 2.6.2 under pure DOS.
> >
> > IDE almost always starts only first time (after installation or reboot).
> > I start the IDE, compile and run the program (e.g. Hello.pas) and close
> > IDE. But when I want to start IDE again it crashes with SIGSEGV message.
> >
> >  Exiting due to signal SIGSEGV
> >  FPC General Protection Fault at eip=006EDE95
> >  eax=65672D6C ebx=0000002A ecx=00000088 edx=00000000 esi=008E91F8
> > edi=0083B504
> >  ebp=008C0CA0 esp=008C0C90 program=C:\PP\BIN\GO32V2\FP.EXE
> >  cs: sel=00A7 base=00400000 limit=008EFFFF
> >  ds: sel=00AF base=00400000 limit=008EFFFF
> >  es: sel=00AF base=00400000 limit=008EFFFF
> >  fs: sel=00C7 base=00000000 limit=0010FFFF
> >  gs: sel=00C7 base=00000000 limit=0010FFFF
> >  ss: sel=00AF base=00400000 limit=008EFFFF
> >
> >  Call frame traceback EIPs:
> >  $006EDE95
> >  $005BD905
> >  $005BCD84
> >  $005BC83D
> >  $005BC7F8
> >  $00308AF8
> >  $0030B9F4
> >  $0002DB50
> >  $0002DC5A
> >  $00002040
> >
> > To be able to start IDE again in DOS I have to reboot the computer.
> > I think IDE set something in memory and warm restart does not erase the
> > memory contents.
> >
> > Compilation from command prompt with FPC.EXE works everywhere.
> > But IDE is good for debugging and help.
> >
> > Can someone please help me or advise what I'm doing wrong.
> >
> > The main problem is running IDE in pure DOS.
>
> Which DOS version is it? Is there any DPMI provider running before
> starting the IDE (some DOS versions include DPMI host themselves)?
>
> If there is no other DPMI host (running) and thus CWSDPMI.EXE is used, I'd
> recommend starting with a check whether there is just one (the latest)
> CWSDPMI.EXE and just for test purposes try loading it into memory as TSR
> with options "-p -x" (see cwsdpmi.txt included in directory doc\fpc) to
> see if it makes any difference.
>
> Obviously, the next step would be compiling the IDE with debug information
> (including -gl) to see where exactly it fails.
>
> Tomas
>
>
> _______________________________________________
> fpc-pascal maillist  -  fpc-pascal at lists.freepascal.org
> http://lists.freepascal.org/mailman/listinfo/fpc-pascal
>
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