cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations net_if/if_nameindex.c -o net_if/if_nameindex -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt 
relibc getrlimit(3, 0x7ffffffffc80): not implemented
relibc getrlimit(3, 0x7ffffffffbb0): not implemented
relibc getrlimit(9, 0x7ffffffffb70): not implemented
relibc getrlimit(9, 0x7ffffffffba0): not implemented
relibc getrlimit(5, 0x7ffffffffba0): not implemented
relibc getrlimit(9, 0x7ffffffffb70): not implemented
net_if/if_nameindex.c:5:37: error: initialization of 'struct if_nameindex * (*)(void)' from incompatible pointer type 'const struct if_nameindex * (*)(void)' [-Werror=incompatible-pointer-types]
    5 | struct if_nameindex *(*foo)(void) = if_nameindex;
      |                                     ^~~~~~~~~~~~
cc1: all warnings being treated as errors