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Date: Thu, 23 Oct 2003 14:17:15 -0400 (EDT)
From: Paul Bezzam <bezzam AT astro DOT ocis DOT temple DOT edu>
X-X-Sender: bezzam AT gs873ps
To: cygwin AT cygwin DOT com
cc: Paul Bezzam <bezzam AT temple DOT edu>
Subject: Re: Compiling errors with '-mno-cygin' option on Cygwin
In-Reply-To: <Pine.GSO.4.56.0310231351510.15002@slinky.cs.nyu.edu>
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Thank you for your inputs Igor, Gerritt.

Paul

On Thu, 23 Oct 2003, Igor Pechtchanski wrote:

> Any DLL that comes with the Cygwin perl is going to depend on cygwin1.dll.
> Same goes for any DLL you build without -mno-cygwin.  However, if you call
> these DLLs from Visual Basic, or use -mno-cygwin when compiling, you'll
> end up with the dependence on both msvcrt.dll (because of VB/-mno-cygwin)
> *and* cygwin1.dll (because of the perl DLLs), and that's an explosive
> combination.
>
> If you really need to use Perl with Visual Basic, you might consider a
> Windows-only version of Perl, e.g. ActiveState, and use the DLLs and
> headers from that distribution in your -mno-cygwin build.  However, be
> aware that this puts you completely outside of the realm of Cygwin, and
> any support you get for this will have to come from some other forum.
> 	Igor
>
> On Thu, 23 Oct 2003, Paul Bezzam wrote:
>
> > Thank you for your replies.  But here is my problem:
> >
> > I am trying to make a DLL from a C program that has embedded Perl in it.
> > I successfully created the DLL, and also created a test C client.  The
> > client successfully calls the DLL.  All this is done in Cygwin and without
> > the "-mno-cygwin" option.
> >
> > But, when I try to invoke this DLL from Visual Basic, the application
> > crashes with the error message, "An unhandled Win32 Exception has
> > occurred in VB6.EXE."
> >
> > Thanks.
> >
> > Paul
> >
> > On Thu, 23 Oct 2003, Igor Pechtchanski wrote:
> >
> > > On Thu, 23 Oct 2003, Paul Bezzam wrote:
> > >
> > > > Hello everyone,
> > > >
> > > > I have this issue: I have a C program that uses embedded perl to call a
> > > > Perl subroutine.  This runs successfully when compiled with gcc with
> > > > default options.  But, when I use the -mno-cygwin option, I get errors
> > > > indicating that some include files are not available. (The error messages
> > > > are shown below my signature)
> > > >
> > > > All of this is on Cygwin.  Can anyone please point my mistakes?
> > > >
> > > > Thank you.
> > > > Paul
> > > >
> > > > Below is part of the error message:
> > > >
> > > > $ gcc -c -mno-cygwin mpdll2.c `perl -MExtUtils::Embed -e ccopts -e ldopts`
> > > > Note (probably harmless): No library found for -lcrypt
> > > > Note (probably harmless): No library found for -lutil
> > > > In file included from mpdll2.c:2:
> > > > /usr/lib/perl5/5.8.0/cygwin-multi-64int/CORE/perl.h:613:27: netinet/in.h:
> > > > No such file or directory
> > > > /usr/lib/perl5/5.8.0/cygwin-multi-64int/CORE/perl.h:617:26: arpa/inet.h:
> > > > No such file or directory
> > > > /usr/lib/perl5/5.8.0/cygwin-multi-64int/CORE/perl.h:663:27: sys/times.h:
> > > > No such file or directory
> > > > /usr/lib/perl5/5.8.0/cygwin-multi-64int/CORE/perl.h:782:30: sys/ioctl.h:
> > > > No such file or directory
> > > > /usr/lib/perl5/5.8.0/cygwin-multi-64int/CORE/perl.h:1193:23: ieeefp.h: No
> > > > such file or directory
> > > > /usr/lib/perl5/5.8.0/cygwin-multi-64int/CORE/perl.h:1984:21: win32.h: No
> > > > such file or directory
> > > > In file included from
> > > > /usr/lib/perl5/5.8.0/cygwin-multi-64int/CORE/perl.h:2215,
> > > >                  from mpdll2.c:2:
> > >
> > > Paul,
> > >
> > > When you give the -mno-cygwin flag to gcc, you're invoking the MinGW
> > > runtime/environment.  MinGW stands for "Minimalist GNU for Windows" (the
> > > keyword here is "Minimalist").  It doesn't supply all of POSIX emulation,
> > > and it's very likely that some of the headers (and system calls) aren't
> > > available in it.
> > >
> > > You will most likely have to implement a lot of the functionality using
> > > Windows native calls (e.g. winsock, etc).  It also looks like you're
> > > pulling in the Cygwin versions of perl headers - while not an error in
> > > itself, this might be a warning flag, since Cygwin and MinGW runtimes
> > > usually don't mix well.
> > >       Igor
>
> --
> 				http://cs.nyu.edu/~pechtcha/
>       |\      _,,,---,,_		pechtcha AT cs DOT nyu DOT edu
> ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
>      |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
>     '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!
>
> "I have since come to realize that being between your mentor and his route
> to the bathroom is a major career booster."  -- Patrick Naughton
>
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