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Date: Fri, 16 Aug 2019 13:11:33 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: Agner Fog <agner AT agner DOT org>
Cc: cygwin AT cygwin DOT com
Subject: Re: Clang is using the wrong memory model
Message-ID: <20190816111133.GV11632@calimero.vinschen.de>
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On Aug 16 12:38, Agner Fog wrote:
>=20
> On 16/08/2019 11.52, Corinna Vinschen wrote:
> > 2 GB. Think errno accessed from another DLL. Your application works only
> > by chance.
>=20
> Good example.
>=20
> errno appears to be a global variable for historical reasons, but errno is
> implemented as a macro that translates to a call to the imported function
> __errno.
>=20
> This function call goes through a 64-bit import table from cygwin1.dll
>=20
> Works fine with -mcmodel=3Dsmall
>=20
> Static sharing of a global variable between exe and dll, or between
> different dll's is not possible.

So errno was a bad example but you can try accessing e.g. __ctype_ptr__,
__progname, optarg, h_errno, or use FE_DFL_ENV from another DLL, just
for kicks.

Just because lots of stuff works with the small mode doesn't mean it's
the right thing to do.  Mcmodels medium and large have been introduced
into GCC during the Cygwin 64 bit port for a reason.


Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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