cc -O2 -pthread  -Wall -Wextra -Werror=implicit-function-declaration wchar/wcpncpy.c -o wchar/wcpncpy -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -lrt  -lintl -lcrypt
wchar/wcpncpy.c: In function 'main':
wchar/wcpncpy.c:13:7: error: implicit declaration of function 'wcpncpy'; did you mean 'wcsncpy'? [-Werror=implicit-function-declaration]
   13 |  if ( wcpncpy(dst, src, 4) != dst + 4 )
      |       ^~~~~~~
      |       wcsncpy
wchar/wcpncpy.c:13:28: warning: comparison between pointer and integer
   13 |  if ( wcpncpy(dst, src, 4) != dst + 4 )
      |                            ^~
cc1: some warnings being treated as errors