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Date:	Mon, 7 Apr 2014 17:38:56 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Possibly wrong address passed to callq asm instruction within MPIR test binaries
Message-ID:	<20140407153856.GA11273@calimero.vinschen.de>
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On Apr  7 14:47, Jean-Pierre Flori wrote:
> Le Mon, 07 Apr 2014 16:36:18 +0200, Corinna Vinschen a =C3=A9crit=C2=A0:
> > At this point gcc doesn't know that foo will get exported from a DLL,
> > but it generates the .def directive nevertheless.  If I create the same
> > code in gas:
> >=20
> > 	.text .globl nothing .def   nothing; .scl 2; .type 32; .endef
> > nothing:
> > 	ret
> >=20
> > then it works, but crashes if I omit the .def directive.  So it seems to
> > me you don't have to export the symbol using the dllimport/dllexport
> > directives, but you have to specify the symbol explicitely for export.
> >=20
> Exactly!
> I came to the same conclusion.
> On top of that, it seems that including the export stuff does not hurt=20
> when building and linking a static lib.
>=20
> What's strange is that when we use the dllimport magic then it works even=
=20
> though the symbol was not explicitely exported.

Perhaps not.  With dllimport, the calling code expects having to import
a symbol from the DLL, so it generates an IAT entry and everything works
as expected.  Along these lines, at least.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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