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




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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