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Date:	Wed, 26 Jan 2022 15:08:22 +0200
Message-Id:	<83h79qhcft.fsf@gnu.org>
From:	"Eli Zaretskii (eliz AT gnu DOT org) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
To:	"Jay K (jayk123 AT hotmail DOT com) [via djgpp AT delorie DOT com]"
	<djgpp AT delorie DOT com>
In-Reply-To:
	<MWHPR1401MB1951CCC95276E44447921D28E6209 AT MWHPR1401MB1951 DOT namprd14 DOT prod DOT outlook DOT com>
	(djgpp AT delorie DOT com)
Subject:	Re: command line lenght problems?
References:
	<MWHPR1401MB1951CCC95276E44447921D28E6209 AT MWHPR1401MB1951 DOT namprd14 DOT prod DOT outlook DOT com>
Reply-To:	djgpp AT delorie DOT com

> From: "Jay K (jayk123 AT hotmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
> Date: Wed, 26 Jan 2022 09:53:31 +0000
> suggested_attachment_session_id: 69785034-0787-e0af-85a1-df4fb0b67acf
> 
> I am trying to port my program to MS-DOS. For fun, granted.
> I figured DJGPP would help.
> Esp. because it seems to have a useful "sigalarm" functionality,
> I might use to implement preemptive threads.
> I have a prototype that suggests that will work:
> 
> https://github.com/modula3/cm3/blob/3be819ed8e2fa60885aff0cb6278934a17b30702/m3-libs/m3core/src/thread/POSIX/test_dos_threads.cpp
> 
> 
> The rest of the Posix support helps also.
>  I'm not sure about network/sockets, maybe give up.
> 
> I have experimented with a few "DOS"s.
>  FreeDOS, DosBos-X, 32bit Windows 10 VM.
> 
> They all have advantages and disadvantages.
> 
> Granted I could spend more time configuring each and none is "really" MS-DOS.
> 
> My program is a compiler, that produces .cpp files and would run g++ or gxx, etc.
>   (I might experiment with e.g. OpenWatcom, might, like if it can link the djpp libraries.)
> 
> I am seeing, I guess, command line length limitations.
> 
> gcc and collect2 crash, but if I run them manually with shorter equivalent-enough commands, they work.
> 
> Advise?
> [...]
> bash:
> ---------------------------
> 16 bit MS-DOS Subsystem
> ---------------------------
> Administrator: C:\Windows\system32\cmd.exe
> NTVDM has encountered a System Error
> NTVDM has encountered a System Error 4001h Choose 'Close' to terminate the application.
> ---------------------------
> Close   Ignore   
> ---------------------------

On what version of Windows is that?

> Exiting due to signal SIGSEGV
> Stack Fault at eip=00000a11

This is stack fault, not necessarily related to the command-line
length.

What does go32-v2 report there if run without arguments?

> eax=00010001 ebx=01ad0080 ecx=01549400 edx=004207bf esi=00001223 edi=00001213
> ebp=0042773a esp=0042773a program=C:\DOS\BIN\GCC.EXE
> cs: sel=00cf  base=000d3a50  limit=00000db0
> ds: sel=00b7  base=000cc160  limit=0000ffff
> es: sel=0040  invalid
> fs: sel=0000
> gs: sel=0000
> ss: sel=00b7  base=000cc160  limit=0000ffff
> App stack: [00423b78..00223b7c]  Exceptn stack: [00223ac8..00221b88]

Something is very wrong in the run environment: the SS segment has
very small limit, ES is invalid...

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