clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations wchar/wcsnlen.c -o wchar/wcsnlen -D_POSIX_C_SOURCE=202405L  -lm  -lintl
wchar/wcsnlen.c:5:42: error: use of undeclared identifier 'wcsnlen'; did you mean 'wcslen'?
size_t (*foo)(const wchar_t *, size_t) = wcsnlen;
                                         ^~~~~~~
                                         wcslen
/usr/include/wchar.h:115:8: note: 'wcslen' declared here
size_t  wcslen(const wchar_t *);
        ^
wchar/wcsnlen.c:5:10: error: incompatible pointer types initializing 'size_t (*)(const wchar_t *, size_t)' with an expression of type 'size_t (const wchar_t *)' [-Werror,-Wincompatible-pointer-types]
size_t (*foo)(const wchar_t *, size_t) = wcsnlen;
         ^                               ~~~~~~~
2 errors generated.