thread-pthreads.c: memory access issue?

[jpellegrini]

Hi!

gcc complains about __sigsetjmp accessing 200 bytes in a region of size 72 in mutex-pthreads.c (see below).
Is this a problem? If it's not, maybe it's possible to get rid of the warning?

gcc -DHAVE_CONFIG_H -I.       -g -O2  -g -O2 -MT mutex-common.o -MD -MP -MF .deps/mutex-common.Tpo -c -o mutex-common.o mutex-common.c
In file included from stklos.h:51,
                 from thread-pthreads.c:30:
thread-pthreads.c: In function ‘start_scheme_thread’:
thread-pthreads.c:95:3: warning: ‘__sigsetjmp’ accessing 200 bytes in a region of size 72 [-Wstringop-overflow=]
   95 |   pthread_cleanup_push(terminate_scheme_thread, thr);
      |   ^~~~~~~~~~~~~~~~~~~~
thread-pthreads.c:95:3: note: referencing argument 1 of type ‘struct __jmp_buf_tag *’
/usr/include/pthread.h:734:12: note: in a call to function ‘__sigsetjmp’
  734 | extern int __sigsetjmp (struct __jmp_buf_tag *__env, int __savemask) __THROWNL;
      |            ^~~~~~~~~~~
mv -f .deps/thread-common.Tpo .deps/thread-common.Po
gcc -DHAVE_CONFIG_H -I.       -g -O2  -g -O2 -MT mutex-pthreads.o -MD -MP -MF .deps/mutex-pthreads.Tpo -c -o mutex-pthreads.o mutex-pthreads.c
mv -f .deps/thread-pthreads.Tpo .deps/thread-pthreads.Po
mv -f .deps/mutex-common.Tpo .deps/mutex-common.Po
mv -f .deps/uvector.Tpo .deps/uvector.Po
mv -f .deps/vector.Tpo .deps/vector.Po
mv -f .deps/vport.Tpo .deps/vport.Po
mv -f .deps/system.Tpo .deps/system.Po
In file included from stklos.h:51,
                 from mutex-pthreads.c:28:
mutex-pthreads.c: In function ‘STk_mutex_lock’:
mutex-pthreads.c:150:3: warning: ‘__sigsetjmp’ accessing 200 bytes in a region of size 72 [-Wstringop-overflow=]
  150 |   pthread_cleanup_push((void (*)()) mutex_finalizer, mtx);
      |   ^~~~~~~~~~~~~~~~~~~~
mutex-pthreads.c:150:3: note: referencing argument 1 of type ‘struct __jmp_buf_tag *’
/usr/include/pthread.h:734:12: note: in a call to function ‘__sigsetjmp’
  734 | extern int __sigsetjmp (struct __jmp_buf_tag *__env, int __savemask) __THROWNL;
      |            ^~~~~~~~~~~
mutex-pthreads.c: In function ‘STk_mutex_unlock’:
mutex-pthreads.c:220:3: warning: ‘__sigsetjmp’ accessing 200 bytes in a region of size 72 [-Wstringop-overflow=]
  220 |   pthread_cleanup_push((void (*)()) mutex_finalizer, mtx);
      |   ^~~~~~~~~~~~~~~~~~~~
mutex-pthreads.c:220:3: note: referencing argument 1 of type ‘struct __jmp_buf_tag *’
/usr/include/pthread.h:734:12: note: in a call to function ‘__sigsetjmp’
  734 | extern int __sigsetjmp (struct __jmp_buf_tag *__env, int __savemask) __THROWNL;
      |            ^~~~~~~~~~~
mv -f .deps/mutex-pthreads.Tpo .deps/mutex-pthreads.Po