| Re: Windows IDL DLM with Cygwin [message #44794 is a reply to message #44706] |
Wed, 13 July 2005 05:11  |
Haje Korth
Messages: 651
Registered: May 1997
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Senior Member |
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Mark,
thanks for pointing out to me that the techtip is really for DLLs not DLMs
(but what is the difference of one letter between friends).
To Joey: I would not waste my precious research time to try to get cygwin to
compile your code. This is a painful lession I learned during my times as a
graduate student. Even though it is from M$, I had a lot of luck with Visual
Studio. Most code especially research code is generic enough not to rely OS
specific extensions, so that I never had to spend much time on conversions.
Cheers,
Haje
"Mark Hadfield" <m.hadfield@niwa.co.nz> wrote in message
news:db1esu$v4m$1@newsreader.mailgate.org...
> joey@swri.edu wrote:
>> Ok, thanks to all who have replied. I believe I got the answer I needed
>> in
>> that "using a Cygwin compiled DLL is impossible with IDL".
>
> The techtip reported by Haje
>
> http://www.rsinc.com/services/techtip.asp?ttid=3798
>
> shows that it *is* possible to use Cygwin-compiled DLLs with IDL, via
> CALL_EXTERNAL. I don't see any mention of the -mno-cygwin switch in the
> techtip, so it looks like these are true Cygwin DLLs.
>
> Of course DLMs are another matter, but this techtip suggests that maybe
> you should persist.
>
> A note for those who are completely mystified by this thread:
>
> Cygwin (http://sources.redhat.com/cygwin/) is a Unix-emulation system for
> Windows. The Cygwin package includes a myriad of different tools, one of
> which is the GCC compiler system, includes the C compiler, gcc. Normally
> an executable produced by gcc will require the Cygwin DLL at run time. It
> is this DLL that provides the Unix API functions. It is also possible to
> use Cygwin's gcc to produce an executable that doesn't require the Cygwin
> DLL. The command-line switch to accomplish this is "-mno-cygwin".
>
> Mingw (http://mingw.sourceforge.net/index.shtml) is a port of the Gnu
> tools to Windows that doesn't rely on a separate run-time DLL. It does not
> emulate Unix, so porting Unix software to Mingw is harder than porting it
> to Cygwin. (The latter is often trivial.) An executable produced by
> Mingw's gcc will look very much like one produced by Cygwin's gcc
> with -mno-cygwin. In fact Cygwin bundles its own version of the Mingw
> headers and import libraries to achieve its "-mno-cygwin" functionality.
>
> --
> Mark Hadfield "Kei puwaha te tai nei, Hoea tahi tatou"
> m.hadfield@niwa.co.nz
> National Institute for Water and Atmospheric Research (NIWA)
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