Re: Error: unknown type name ‘pthread_attr_t’ in signal.h

[Corinna Vinschen <corinna-cygwin@cygwin.com>]

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On Oct 16 03:12, 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.

That's right, but that's usually not a problem because the pthread
types are included via sys/types.h.  That means, a simple testcase
like 

  #include <signal.h>
  main(){}

isn't sufficient to trigger the above, neither with nor without
-D_XOPEN_SOURCE=600.  And there's the fact that emacs is part
of the Cygwin distro, so it seems you're using a non-standard
setting somewhere.

We could add #include sys/_pthreadtypes.h to cygwin/signal.h
unconditioanlly, but it would be interesting to know how the
above include chain works, and why sys/_pthreadtypes.h isn't
picked up.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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