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From:	Ken Brown <kbrown AT cornell DOT edu>
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Date:	Mon, 16 Oct 2017 10:59:41 -0400
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On 10/16/2017 3:12 AM, Jeffrey Walton wrote:
> Hi Everyone,
> 
> I'm trying to build Emacs on Cygwin. I use the platform as a test bed
> because of Newlib. Emacs is failing with:
> 
> gcc -DHAVE_CONFIG_H -I. -I../lib -I../src -I../src
> -I/usr/local/include -DNDEBUG -pthread -D_XOPEN_SOURCE=600    -m64 -MT
> close-stream.o -MD -MP -MF .deps/close-stream.Tpo -c -o close-stream.o
> close-stream.c
> In file included from /usr/include/sys/signal.h:22:0,
>                   from /usr/include/signal.h:6,
>                   from ./signal.h:52,
>                   from ./sys/select.h:107,
>                   from /usr/include/sys/time.h:47,
>                   from ./sys/time.h:39,
>                   from ./sys/select.h:86,
>                   from /usr/include/sys/types.h:68,
>                   from ./sys/types.h:28,
>                   from ./fcntl.h:50,
>                   from binary-io.h:23,
>                   from binary-io.c:3:
> /usr/include/cygwin/signal.h:175:3: error: unknown type name ‘pthread_attr_t’
>     pthread_attr_t *sigev_notify_attributes; /* notification attributes */
>     ^~~~~~~~~~~~~~
> 
> Examining /usr/include/cygwin/signal.h around 175, I see:
> 
> typedef struct sigevent
> {
>    sigval_t sigev_value;                 /* signal value */
>    int sigev_signo;                      /* signal number */
>    int sigev_notify;                     /* notification type */
>    void (*sigev_notify_function) (sigval_t); /* notification function */
>    pthread_attr_t *sigev_notify_attributes; /* notification attributes */
> } sigevent_t;
> 
> But I don't see an include for the pthread gear in the signal.h header file.
> 
> I found one past message that's similar
> (https://cygwin.com/ml/cygwin/2016-06/msg00458.html), but its reported
> as an upstream bug.

Yes, it was an upstream gnulib issue that was fixed long ago.  I suspect 
you're building an old version of emacs that hadn't yet imported the 
fixed gnulib.  Try building the latest emacs release.  It should build 
with a simple ./configure && make.

Ken


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