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Subject:	Re: New C compilation error using the Openwindow/xview-devel toolkit on current (September 2015) 32 bit Cygwin
To:	cygwin AT cygwin DOT com
References:	<CAB_pihYb0Na6xzMbnBniYFZnpPj2ik=76-dzq5euL3Y01igfQw AT mail DOT gmail DOT com>
From:	Ken Brown <kbrown AT cornell DOT edu>
Message-ID:	<560D95A3.9050403@cornell.edu>
Date:	Thu, 1 Oct 2015 16:20:51 -0400
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On 10/1/2015 2:38 PM, Paul Morgan wrote:
> I can no longer compile C code linked to the Openwindows/xview-devel
> toolkit using gcc in Cygwin 32 bits, installed on Windows 7 32 or 64
> bit systems. I run setup-x86 weekly to update Cygwin - compilation ran
> fine in August 2015 but by mid September 2015 it was failing on the
> same code.
>
> I can reproduce this by compiling C code from the xview-examples
> package (from e.g., Debian i386
> https://packages.debian.org/jessie/xview-examples ), to eliminate any
> issues with my specific code. For example,
>
> $ cd usr/share/doc/xviewg/examples/panels
>
> $ cc -O -I/usr/openwin/include simple_panel.c -L/usr/openwin/lib
> -lxview -lolgx -lX11 -o simple_panel
>
> In file included from /usr/openwin/include/xview/pkg.h:27:0,
>                   from /usr/openwin/include/xview/pkg_public.h:19,
>                   from /usr/openwin/include/xview/generic.h:39,
>                   from /usr/openwin/include/xview/xview_xvin.h:41,
>                   from /usr/openwin/include/xview/xview.h:18,
>                   from simple_panel.c:5:
> /usr/openwin/include/xview/notify.h:34:13: error: conflicting types
> for ‘ucontext_t’
>   typedef int ucontext_t;
>               ^
> In file included from /usr/include/sys/signal.h:357:0,
>                   from /usr/include/signal.h:5,
>                   from /usr/openwin/include/xview/xview_xvin.h:18,
>                   from /usr/openwin/include/xview/xview.h:18,
>                   from simple_panel.c:5:
> /usr/include/sys/ucontext.h:24:3: note: previous declaration of
> ‘ucontext_t’ was here
>   } ucontext_t;
>     ^
>
> There now appears to be an issue with the definition of ucontext_t in
> xview-devel with respect to Cygwin. If I manually edit
> /usr/openwin/include/xview/base.h and change line 70 from undef to
> #define SYSV_UCONTEXT
> ... the example above then compiles fine.
>
> I cannot find any reference to recent Cygwin updates related to the
> definition of ucontext_t

https://cygwin.com/ml/cygwin-announce/2015-08/msg00033.html

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