cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration locale/uselocale.c -o locale/uselocale -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
relibc getrlimit(3, 0x7ffffffffc80): not implemented
relibc getrlimit(3, 0x7ffffffffba0): not implemented
relibc getrlimit(9, 0x7ffffffffb60): not implemented
relibc getrlimit(9, 0x7ffffffffb90): not implemented
relibc getrlimit(5, 0x7ffffffffb90): not implemented
relibc getrlimit(9, 0x7ffffffffb60): not implemented
locale/uselocale.c: In function 'main':
locale/uselocale.c:9:9: error: unknown type name 'locale_t'
    9 |         locale_t locale = newlocale(LC_ALL_MASK, "C", (locale_t) 0);
      |         ^~~~~~~~
locale/uselocale.c:9:27: error: implicit declaration of function 'newlocale'; did you mean 'setlocale'? [-Werror=implicit-function-declaration]
    9 |         locale_t locale = newlocale(LC_ALL_MASK, "C", (locale_t) 0);
      |                           ^~~~~~~~~
      |                           setlocale
locale/uselocale.c:9:37: error: 'LC_ALL_MASK' undeclared (first use in this function)
    9 |         locale_t locale = newlocale(LC_ALL_MASK, "C", (locale_t) 0);
      |                                     ^~~~~~~~~~~
locale/uselocale.c:9:37: note: each undeclared identifier is reported only once for each function it appears in
locale/uselocale.c:9:56: error: 'locale_t' undeclared (first use in this function); did you mean 'locale'?
    9 |         locale_t locale = newlocale(LC_ALL_MASK, "C", (locale_t) 0);
      |                                                        ^~~~~~~~
      |                                                        locale
locale/uselocale.c:9:65: error: expected ')' before numeric constant
    9 |         locale_t locale = newlocale(LC_ALL_MASK, "C", (locale_t) 0);
      |                                    ~                            ^~
      |                                                                 )
locale/uselocale.c:10:34: error: expected ')' before numeric constant
   10 |         if ( locale == (locale_t) 0 )
      |            ~                     ^~
      |                                  )
locale/uselocale.c:12:17: error: expected ';' before 'old_locale'
   12 |         locale_t old_locale = uselocale(locale);
      |                 ^~~~~~~~~~~
      |                 ;
locale/uselocale.c:13:14: error: 'old_locale' undeclared (first use in this function); did you mean 'locale'?
   13 |         if ( old_locale != LC_GLOBAL_LOCALE )
      |              ^~~~~~~~~~
      |              locale
locale/uselocale.c:13:28: error: 'LC_GLOBAL_LOCALE' undeclared (first use in this function)
   13 |         if ( old_locale != LC_GLOBAL_LOCALE )
      |                            ^~~~~~~~~~~~~~~~
locale/uselocale.c:15:22: error: implicit declaration of function 'uselocale'; did you mean 'setlocale'? [-Werror=implicit-function-declaration]
   15 |         old_locale = uselocale((locale_t) 0);
      |                      ^~~~~~~~~
      |                      setlocale
locale/uselocale.c:15:42: error: expected ')' before numeric constant
   15 |         old_locale = uselocale((locale_t) 0);
      |                               ~          ^~
      |                                          )
cc1: some warnings being treated as errors