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Date:	Mon, 7 May 2001 21:03:32 +1000 (EST)
From:	=?iso-8859-1?q?Danny=20Smith?= <danny_r_smith_2001 AT yahoo DOT co DOT nz>
Subject:	RE: Using setupapi.lib/h/dll from cygwin
To:	Svein Erling Seldal <Svein DOT Seldal AT edcom DOT no>,
	"Larry Hall \(RFK Partners, Inc\)" <lhall AT rfk DOT com>, cygwin AT cygwin DOT com
In-Reply-To:	<NEBBLKFNEDOFBCDCJMLKIEJGCDAA.Svein.Seldal@edcom.no>
MIME-Version:	1.0

--- Svein Erling Seldal <Svein DOT Seldal AT edcom DOT no> wrote: > 
> > From: Larry Hall (RFK Partners, Inc) [mailto:lhall AT rfk DOT com]
> >
> > At 06:56 PM 5/5/2001, Svein Erling Seldal wrote:
> > >Well, how is this done?
> > >
> > >If I use: 'gcc -o foo foo.o'
> > >Returns: foo.o(.text+0x1b):foo.c: undefined reference to
> > >`_imp__SetupDiGetClassDevsA AT 16'
> > >
> > >If I use: 'gcc -o foo foo.o setupapi.lib'
> > >Returns the same
> >
> >
> > OK, what does the symbol in setupapi.lib look like?  What you did should
> > work if the symbol is in the library and matches the reference exactly.
> 
> OK. I get your point:
> 
> My app requires "SetupDiGetClassDevs()". When compiled, it generates a
> reference to "SetupDiGetClassDevsA AT 16" *or* "_imp__SetupDiGetClassDevsA AT 16"
> (depending on wheter og not I edit the original MS setupapi.h file, where I
> remove the #define WINSETUPAPI DECLSPEC_IMPORT setting or not).
> 
> Now, the MS provided setupapi.lib, however, defines these symbols as:
> "_SetupDiGetClassDevsA" and its imported reference as
> "__imp__SetupDiGetClassDevsA". That's why it isnt working.
> 

Are you sure about that? That's what nm says but I think gcc nm (&ld) is
misreading the implib  MS PSDK dumpbin shows the stdcall decoration. setapi.dll
is a strange one in that it can use a remote drive or a removeable drive for
swap file storage - this is in the dll image header.  Maybe the MS implib is a
bit strange as well.


> So the fix to this problem is either: 1) I need to generate a libsetupapi.a
> which uses the GNU naming method somehow. Or 2) tell the GNU compiler not to
> use the '@16' postfix-scheme on this specific library/dll. Correct?
> 
To fix the problem, you need a def file and then rebuild the implib as per the
rest of the w32api implibs.  A submission to w32api maintainer will be in the
pipe tomorrow.

> Regards,
> Svein Erling Seldal
> 
> 
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