cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration pthread/pthread_cleanup_pop.c -o pthread/pthread_cleanup_pop -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
pthread/pthread_cleanup_pop.c: In function ‘start’:
pthread/pthread_cleanup_pop.c:35:9: error: implicit declaration of function ‘pthread_cleanup_push’ [-Wimplicit-function-declaration]
   35 |         pthread_cleanup_push(cleanup1, NULL);
      |         ^~~~~~~~~~~~~~~~~~~~
pthread/pthread_cleanup_pop.c:40:9: error: implicit declaration of function ‘pthread_cleanup_pop’ [-Wimplicit-function-declaration]
   40 |         pthread_cleanup_pop(0);
      |         ^~~~~~~~~~~~~~~~~~~
pthread/pthread_cleanup_pop.c:43:17: error: implicit declaration of function ‘pthread_setcancelstate’ [-Wimplicit-function-declaration]
   43 |                 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
      |                 ^~~~~~~~~~~~~~~~~~~~~~
pthread/pthread_cleanup_pop.c:43:40: error: ‘PTHREAD_CANCEL_DISABLE’ undeclared (first use in this function)
   43 |                 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
      |                                        ^~~~~~~~~~~~~~~~~~~~~~
pthread/pthread_cleanup_pop.c:43:40: note: each undeclared identifier is reported only once for each function it appears in
pthread/pthread_cleanup_pop.c: In function ‘main’:
pthread/pthread_cleanup_pop.c:66:23: error: implicit declaration of function ‘pthread_cancel’; did you mean ‘pthread_once’? [-Wimplicit-function-declaration]
   66 |         if ( (errno = pthread_cancel(thread)) )
      |                       ^~~~~~~~~~~~~~
      |                       pthread_once
pthread/pthread_cleanup_pop.c:71:24: error: ‘PTHREAD_CANCELED’ undeclared (first use in this function); did you mean ‘PTHREAD_NULL’?
   71 |         if ( result != PTHREAD_CANCELED )
      |                        ^~~~~~~~~~~~~~~~
      |                        PTHREAD_NULL