cc -O2 -pthread  -Wall -Wextra -Werror=implicit-function-declaration wchar/wcpcpy.c -o wchar/wcpcpy -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -lrt  -lintl -lcrypt
wchar/wcpcpy.c: In function 'main':
wchar/wcpcpy.c:11:7: error: implicit declaration of function 'wcpcpy'; did you mean 'wcscpy'? [-Werror=implicit-function-declaration]
   11 |  if ( wcpcpy(dst, src) != dst + 7 )
      |       ^~~~~~
      |       wcscpy
wchar/wcpcpy.c:11:24: warning: comparison between pointer and integer
   11 |  if ( wcpcpy(dst, src) != dst + 7 )
      |                        ^~
cc1: some warnings being treated as errors