cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration locale/duplocale.c -o locale/duplocale -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/duplocale.c: In function 'main':
locale/duplocale.c:9:9: error: unknown type name 'locale_t'
    9 |         locale_t locale1 = duplocale(LC_GLOBAL_LOCALE);
      |         ^~~~~~~~
locale/duplocale.c:9:28: error: implicit declaration of function 'duplocale'; did you mean 'setlocale'? [-Werror=implicit-function-declaration]
    9 |         locale_t locale1 = duplocale(LC_GLOBAL_LOCALE);
      |                            ^~~~~~~~~
      |                            setlocale
locale/duplocale.c:9:38: error: 'LC_GLOBAL_LOCALE' undeclared (first use in this function)
    9 |         locale_t locale1 = duplocale(LC_GLOBAL_LOCALE);
      |                                      ^~~~~~~~~~~~~~~~
locale/duplocale.c:9:38: note: each undeclared identifier is reported only once for each function it appears in
locale/duplocale.c:10:26: error: 'locale_t' undeclared (first use in this function); did you mean 'locale1'?
   10 |         if ( locale1 == (locale_t) 0 )
      |                          ^~~~~~~~
      |                          locale1
locale/duplocale.c:10:35: error: expected ')' before numeric constant
   10 |         if ( locale1 == (locale_t) 0 )
      |            ~                      ^~
      |                                   )
locale/duplocale.c:12:17: error: expected ';' before 'locale2'
   12 |         locale_t locale2 = duplocale(locale1);
      |                 ^~~~~~~~
      |                 ;
locale/duplocale.c:13:14: error: 'locale2' undeclared (first use in this function); did you mean 'locale1'?
   13 |         if ( locale2 == (locale_t) 0 )
      |              ^~~~~~~
      |              locale1
locale/duplocale.c:13:35: error: expected ')' before numeric constant
   13 |         if ( locale2 == (locale_t) 0 )
      |            ~                      ^~
      |                                   )
locale/duplocale.c:15:17: error: expected ';' before 'locale3'
   15 |         locale_t locale3 = newlocale(LC_ALL_MASK, "C", (locale_t) 0);
      |                 ^~~~~~~~
      |                 ;
locale/duplocale.c:16:14: error: 'locale3' undeclared (first use in this function); did you mean 'locale1'?
   16 |         if ( locale3 == (locale_t) 0 )
      |              ^~~~~~~
      |              locale1
locale/duplocale.c:16:35: error: expected ')' before numeric constant
   16 |         if ( locale3 == (locale_t) 0 )
      |            ~                      ^~
      |                                   )
locale/duplocale.c:18:17: error: expected ';' before 'locale4'
   18 |         locale_t locale4 = duplocale(locale3);
      |                 ^~~~~~~~
      |                 ;
locale/duplocale.c:19:14: error: 'locale4' undeclared (first use in this function); did you mean 'locale1'?
   19 |         if ( locale4 == (locale_t) 0 )
      |              ^~~~~~~
      |              locale1
locale/duplocale.c:19:35: error: expected ')' before numeric constant
   19 |         if ( locale4 == (locale_t) 0 )
      |            ~                      ^~
      |                                   )
locale/duplocale.c:21:9: error: implicit declaration of function 'freelocale'; did you mean 'setlocale'? [-Werror=implicit-function-declaration]
   21 |         freelocale(locale1);
      |         ^~~~~~~~~~
      |         setlocale
cc1: some warnings being treated as errors