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Message-ID: <3BBA9D57.5050109@ece.gatech.edu>
Date: Wed, 03 Oct 2001 01:08:39 -0400
From: Charles Wilson <cwilson AT ece DOT gatech DOT edu>
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To: Danny Smith <danny_r_smith_2001 AT yahoo DOT co DOT nz>
CC: "Asbenson, Lyndell L" <lyndell DOT l DOT asbenson AT intel DOT com>,
   "'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject: Re: DLL Win 2000
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Danny Smith wrote:
>  --- Charles Wilson <cwilson AT ece DOT gatech DOT edu> wrote: > > 
> 
> 
>>The problem is, MS .obj format files are NOT compatible with gcc/ld. 
>>I'm really surprised you were able to link at all.
>>
>>
> 
> This is news to me. As long as the obj file has no dependency on static
> MS runtime (or other MS static lib), on MS debug heap  or on C++
> references they work, with mingw or with -mno-cygwin option.  The other
> gotcha is struct layout, which can be fixed with -fnative-struct
> option.

Ding!


> 
> The usual problem however is dependency on MS libc[mt].lib
> 

And another ding!

What you're saying is, that *theoretically* you can use a .obj file with 
gcc .o's -- but in practice it's rarely possible.  (1) you have to be 
careful to use -fnative-struct with your gcc compiliation, (2) only .obj 
files that make NO references to ANY runtime functions (open, fopen, 
printf, etc) are usable.

That's a lot of restrictions.  Wouldn't it be nice if the gpib IO card 
manufacturer released their @#$@!& source, instead of distributing .obj 
files?

--Chuck


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