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Re: Compiling errors with '-mno-cygin' option on Cygwin

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:


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.
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