clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations poll/ppoll.c -o poll/ppoll -D_POSIX_C_SOURCE=202405L  -lm  -lintl
poll/ppoll.c:5:51: error: declaration of 'struct timespec' will not be visible outside of this function [-Werror,-Wvisibility]
int (*foo)(struct pollfd [], nfds_t, const struct timespec *restrict, const sigset_t *restrict) = ppoll;
                                                  ^
poll/ppoll.c:5:77: error: unknown type name 'sigset_t'
int (*foo)(struct pollfd [], nfds_t, const struct timespec *restrict, const sigset_t *restrict) = ppoll;
                                                                            ^
poll/ppoll.c:5:99: error: use of undeclared identifier 'ppoll'; did you mean 'poll'?
int (*foo)(struct pollfd [], nfds_t, const struct timespec *restrict, const sigset_t *restrict) = ppoll;
                                                                                                  ^~~~~
                                                                                                  poll
/usr/include/poll.h:83:5: note: 'poll' declared here
int     poll(struct pollfd *, nfds_t, int);
        ^
poll/ppoll.c:5:7: error: incompatible pointer types initializing 'int (*)(struct pollfd *, nfds_t, const struct timespec *restrict, const int *restrict)' with an expression of type 'int (struct pollfd *, nfds_t, int)' [-Werror,-Wincompatible-pointer-types]
int (*foo)(struct pollfd [], nfds_t, const struct timespec *restrict, const sigset_t *restrict) = ppoll;
      ^                                                                                           ~~~~~
4 errors generated.