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Date: Wed, 6 Feb 2002 12:31:35 -0800
From: Wade Brainerd <wadeb AT wadeb DOT com>
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Reply-To: Wade Brainerd <wadeb AT wadeb DOT com>
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Message-ID: <134139442609.20020206123135@wadeb.com>
To: "Barubary" <barubary AT cox DOT net>
CC: cygwin AT cygwin DOT com
Subject: Re[2]: DirectX8/DirectInput + cygwin
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 <3C6171A9 DOT 2080702 AT syntrex DOT com> <20020206181851 DOT GF11730 AT redhat DOT com>
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Ok, I have a question about this but it may be obvious.

How can you do anything patentable with virtual tables?  They're pointers
to arrays of function pointers.  It's not like DirectX is even laced with
virtual (or even multiple) inheritance or anything like that.  That's the
only reason their C interface system even works.

The most complicated thing I can imagine is how they determine the order
of functions in the table, but from the C interface stuff it would appear
that they're in declaration order...

-Wade

Wednesday, February 06, 2002, 12:20:23 PM, you wrote:

B> What about the more important problem that Microsoft's patented virtual
B> table system, which COM uses, isn't supported by GCC?

B> -- Barubary

B> ----- Original Message -----
B> From: "Christopher Faylor" <cygwin AT cygwin DOT com>
B> To: <cygwin AT cygwin DOT com>
B> Sent: Wednesday, February 06, 2002 10:18 AM
B> Subject: Re: DirectX8/DirectInput + cygwin


>> On Wed, Feb 06, 2002 at 07:10:49PM +0100, Pavel Tsekov wrote:
>> >Christopher Faylor wrote:
>> >>On Wed, Feb 06, 2002 at 12:11:58PM +0100, Pavel Tsekov wrote:
>> >>>Dylan Cuthbert wrote:
>> >>>>I am linking directly with the .lib files supplied by Microsoft, and
>> >>>>all the Directx8 GUID references seem to link fine so does anybody
B> have
>> >>>>any idea what the problem might be?
>> >>>>
>> >>>Why ?  Link against those in /usr/lib.  gcc doesn't understand the MS
>> >>>export libraries.
>> >>
>> >>Actually, gcc/ld should understand non-c++ import libraries.
>> >
>> >Is this a new feature or I was missing something all the time ?  What's
>> >the point of tools which build .a files from dlls ?
>>
>> If you have an existing .lib import library it should work fine with ld.
>> This has been the case for years.
>>
>> This is not to say that there haven't been bugs over the years, but AFAIK,
>> there aren't any in the current version of cygwin.
>>
>> If it helps you can rename foo.lib to libfoo.a so that you can add -lfoo
>> to the command line.
>>
>> You can also link against the dll itself, in many cases:
>>
>> gcc -o foo.exe foo.c blah.dll
>>
>> cgf
>>
>> --
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