Mailing-List: contact cygwin-help@sourceware.cygnus.com; run by ezmlm Sender: cygwin-owner@sourceware.cygnus.com Delivered-To: mailing list cygwin@sourceware.cygnus.com Sender: tjh@quadstone.com Message-ID: <36DE5309.24E587FB@quadstone.com> Date: Thu, 04 Mar 1999 09:31:53 +0000 From: T J Harding Organization: Quadstone X-Mailer: Mozilla 4.5 [en] (X11; I; SunOS 5.6 sun4u) X-Accept-Language: en MIME-Version: 1.0 To: DJ Delorie CC: cygwin@sourceware.cygnus.com Subject: Re: How to handle variables (data, etc.) in DLLs? References: <36DD41B4.BF1C00D7@quadstone.com> <199903031619.LAA28028@envy.delorie.com> Content-Type: multipart/mixed; boundary="------------C3D998DB2BB6DAA8A5993F54" --------------C3D998DB2BB6DAA8A5993F54 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit DJ Delorie wrote: > DLLs *can't* export "data". They can only export pointers to data, > which is what they do. In older gccs, you'll need to do something > like this: > > extern int *__imp_foo; > #define foo (*__imp_foo) > > In newer gccs, do something like this: > > extern int foo __attribute__((dllimport)); > > These tell gcc to dereference the imported pointer, rather than > thinking it's the data itself. Thanks, that's useful to know (although there are about 250 of these data symbols in the code!). I'd need to brush up on my C++ (yes, this is actually C++ code) to figure out what's required. Tim --------------C3D998DB2BB6DAA8A5993F54 Content-Type: text/x-vcard; charset=us-ascii; name="tjh.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for T J Harding Content-Disposition: attachment; filename="tjh.vcf" begin:vcard n:Harding;Tim tel;cell:+44 961 444986 tel;fax:+44 131 220 4492 tel;work:+44 131 220 4491 x-mozilla-html:TRUE url:www.quadstone.com org:Quadstone adr:;;16 Chester Street;Edinburgh;Scotland;EH3 7RA;United Kingdom version:2.1 email;internet:tjh@quadstone.com title:Decisionhouse Services x-mozilla-cpt:;-1080 fn:Tim Harding end:vcard --------------C3D998DB2BB6DAA8A5993F54 Content-Type: text/plain; charset= -- Want to unsubscribe from this list? Send a message to cygwin-unsubscribe@sourceware.cygnus.com --------------C3D998DB2BB6DAA8A5993F54--