cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations locale/uselocale.c -o locale/uselocale -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
locale/uselocale.c:5:12: error: type specifier missing, defaults to 'int' [-Werror,-Wimplicit-int]
locale_t (*foo) (locale_t) = uselocale;
           ^
locale/uselocale.c:5:1: error: type specifier missing, defaults to 'int' [-Werror,-Wimplicit-int]
locale_t (*foo) (locale_t) = uselocale;
^
locale/uselocale.c:5:18: error: a parameter list without types is only allowed in a function definition
locale_t (*foo) (locale_t) = uselocale;
                 ^
locale/uselocale.c:5:30: error: use of undeclared identifier 'uselocale'; did you mean 'setlocale'?
locale_t (*foo) (locale_t) = uselocale;
                             ^~~~~~~~~
                             setlocale
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/locale.h:53:8: note: 'setlocale' declared here
char            *setlocale(int, const char *);
                 ^
4 errors generated.