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From:	Karl M <karlm30 AT hotmail DOT com>
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Subject:	FW: cyggfortran-3.dll broken ?
Date:	Wed, 23 Mar 2011 11:17:47 -0700
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> Date: Wed, 23 Mar 2011 17:49:42 +0000
> From: dave.korn
> Subject: Re: cyggfortran-3.dll broken ?
>=20
> On 23/03/2011 17:31, Charles Wilson wrote:
>=20
> > Err...no, I don't think so. Symbol forwarding is actually implemented
> > as part of the PE-I386 spec, so it resides in the forwardING dll itself,
> > not the import library, and is handled at runtime by the windows loader:
>=20
> Yes yes yes, you're jumping too far ahead; what I was pointing out is that
> you still have to have an import stub in order to pull in the import from=
 the
> forwarding DLL.
>=20
> > However, by NOT having a thunk present in the import library, then when
> > linking a new client the symbol will be resolved by libcygwin.a and will
> > show up in the new client's import list as coming directly from cygwin1=
.dll.
>=20
> Well that seems like it would be cleaner in theory, but it would still
> constitute a change to the ABI exported by libgfortran, which is what we =
were
> trying to avoid; if we're keeping the ABI constant, then future fortran a=
pps
> linked against libgfortran should also continue to get their math functio=
ns
> from there rather than cygwin1.
>=20
> We'd want to keep the forwarders in place forever, and here's the good th=
ing
> about how it works: regardless which dll.a the import stub comes from and=
 how
> many DLLs it does or doesn't forward through before it reaches the actual
> implementation, that's all indirected away by the loader and at run-time =
it's
> still just a single indirect jump in both cases.
>=20
> Hmm, I should probably do this. And send it upstream too. But I'll
> prioritise it lower than bringing newer compiler versions onstream unless=
 we
> start to get a lot of problem reports.
>=20
What if you just put the functions back in until the next gfortran dll vers=
ion bump?

...Karl=20=09=09=20=09=20=20=20=09=09=20=20

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