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Date:	Sun, 2 Jan 2022 13:48:57 +0100
From:	"Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
To:	djgpp AT delorie DOT com
Subject:	Re: binutils 2.37 fails PDCurses library make with "ar: invalid
	operation"
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Am Sat, 1 Jan 2022 17:30:43 -0800 (PST)
schrieb "Jamie Bainbridge (jamie DOT bainbridge AT gmail DOT com) [via
djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>:

> On Sunday, 2 January 2022 at 9:01:39 am UTC+10, Juan Manuel Guerrero
> (juan DOT guerrero AT gmx DOT de) [via djgpp AT delorie DOT com] wrote:
> > Am Fri, 31 Dec 2021 20:03:57 -0800 (PST)
> > schrieb "Jamie Bainbridge (jamie DOT ba DOT  DOT  DOT  AT gmail DOT com) [via
> > dj DOT  DOT  DOT  AT delorie DOT com]" <dj DOT  DOT  DOT  AT delorie DOT com>:
> > > Hello,
> > >
> > > Compiling the PDCurses-3.9 source with the latest binutils
> > > (bnu237b) fails to create the library file with:
> > >
> > > ar: curses.a: invalid operation
> > >
> > > You can also reproduce the same error easily with the same
> > > command manually:
> > >
> > > ar rcv curses.a *.o
> > >
> > > ar makes a small 8-byte curses.a file but that's obviously not
> > > valid.
> > >
> > > Trying several previous versions (bnu232b, bnu234b, bnu2351b)
> > > with the same compiled object files all work fine.
> > >
> > > I'm compiling the latest stable PDCurses from upstream:
> > > https://github.com/wmcbrine/PDCurses/releases/tag/3.9
> > >
> > > The only change I've made is to add -DPDC_RGB to CFLAGS and
> > > change the LIBCURSES variable to "curses.a".
> > >
> > > My environment is dosbox-staging. I've set "LFN=n" in djgpp.env
> > > as DOSBox doesn't have LFN support (at least not this fork of
> > > it). There are no long filenames involved here anyway.
> > >
> > > I hope that's a useful enough error report. Please let me know if
> > > I can provide any more information.
> > >
> > > Jamie
> > OFYI, after having installed DOSBox I was able to reproduce the
> > bug. What the maintariners of binutils have changed between
> > bnu2351b and bnu237b is completely unknown to me. It seems to be a
> > DOSBox specific issue and AFIAK DOSBox has never been recommended
> > to be used as DJGPP development environment. I will try to
> > investigate this issue when I have enough time. This will not be
> > quite soon.
> >
> > Use bnu2351b; AFAIK there are no DJGPP specific changes between
> > bnu2351b and bnu237b.
> >
> >
> > Regrads,
> > Juan M. Guerrero
>
> I'm also unable to reproduce this in a DOS 6.22 virtual machine. I
> agree it's a DOSBox-specific issue.
>
> Thinking about DOSBox limits, there are a hard-coded number of FILES
> and FCBs, I thought maybe ar has generally changed the way it reads
> input files and is hitting a limit. However, trying the DOSBox-X fork
> which allows these to be configured, FILES=10 produced a different
> more specific error "ar: Too many open files (EMFILE)" so at least a
> file limit doesn't appear to be the problem.
>
> Thank you for your time testing. I agree there's no rush to fix it and
> DOSBox isn't such a great environment for DJGPP anyway.
>
> It's possible to work around this with a DOS VM (probably FreeDOS
> too), or cross-compile on Linux, or just use bnu2351b in DOSBox.
> That's plenty of valid alternatives.
>
> Jamie


To finish this issue, I have installed MSDOS 6.22 and FreeDOS 1.3RC5
on VirtualBOX and compiled the DJGPP port of PDCurses-3.9 (aka
pdcur39s.zip) and I have expirienced no issues at all.  All the test
programs of PDCurses-3.9 run flawlessly.  The port itself is OK and has
been used to create the DJGPP port of lynx (aka l290d10b.zip).  Both
ports have been created using bnu237b.

It seems to be an DosBOX issue that I will investigate ASAP, but to be
honest I am not aware of any DJGPP specific reason that justifies the
update from bnu2351b to bnu237b.  So if some one preferes to use DosBOX
as development environment for DJGPP, then there is no reason at all to
use bnu237b instead of bnu2351b, especially if he uses gcc346b.zip like
me.

Regards,
Juan M. Guerrero

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