Re: [Mingw-users] Splitting a DLL

[Jose F. <jrf...@em...>]

----- Original Message -----
From: "Jim Roy" <ji...@ng...>
To: <min...@li...>
Sent: Monday, September 17, 2001 9:49 PM
Subject: [Mingw-users] Splitting a DLL


> Hi everyone,
>
> I have a working DLL that I want to split into 2 parts.
>
> Shouldn't I be able to cook up the two parts, using
> pretty much the same process as for the whole enchillada?
>

In principle yes. But some files will probably have to be rebuilted,
especially if they export data. The data that belongs to the other dll mu=
st
be preceded by __declspec(dllimport) in the declaration and vice-versa. S=
o
it can mean using CPP macros in the declaration headers.

> For some reason, the application can't load the one DLL.

Could you be more specific here?

> Nm shows that it contains DllMain@12 and DllMainCRTStartup@12.
> I suspect this is my problem, because I don't see these in the
> "big" dll, but I can't figure out why they are there, or how to
> make them go away.
>

AFAIK, these must be present in all dlls. They are equivalent to the main=
()
function of C in the dll word. If you don't provide these functions
yourself, the linker will link the default one provided by the mingw C
runtime libraries.

IMHO, they shouldn't be important unless there must be specific startup/e=
xit
code when loading the dll.

> I've tried various combinations of g77 -shared and dlltool/g77
> as per the dlltool man page.  BTW, One source file is fortran,
> and the rest are C, and it's the DLL with the fortran that
> has the extra symbols.
>
> Can someone give me a hint?
>

As said before please give more information (the error message, when does=
 it
appear, ...).

Jos=E9 Fonseca

> Thanks,
>
> ---
> Jim Roy                      voice  541 757 7231
> Sys. Admin.                  fax    541 757 7331
> NW Geophysical Assoc.        http://www.nga.com
> Corvallis Or. US
> ---