glibc/locale/Versions

libBrokenLocale {
  GLIBC_2.0 {
    __ctype_get_mb_cur_max;
  }
}

libc {
  GLIBC_2.0 {
    # global variables
    __collate_element_hash; __collate_element_strings;
    __collate_symbol_classes; __collate_symbol_hash; __collate_symbol_strings;
    _libc_intl_domainname; _nl_current_LC_COLLATE; _nl_current_LC_CTYPE;

    # functions used in inline functions or macros
    __ctype_get_mb_cur_max;

    # l*
    localeconv;

    # n*
    nl_langinfo;

    # s*
    setlocale;
  }
  GLIBC_2.1 {
    # functions from the experimental locale implementation
    __newlocale; __duplocale; __freelocale;
    __isalnum_l; __isalpha_l; __isascii_l; __isblank_l; __iscntrl_l;
    __isdigit_l; __isgraph_l; __islower_l; __isprint_l; __ispunct_l;
    __isspace_l; __isupper_l; __iswalnum_l; __iswalpha_l; __iswblank_l;
    __iswcntrl_l; __iswctype_l; __iswdigit_l; __iswgraph_l; __iswlower_l;
    __iswprint_l; __iswpunct_l; __iswspace_l; __iswupper_l; __iswxdigit_l;
    __isxdigit_l; __strcasecmp_l; __strcoll_l; __strfmon_l; __strncasecmp_l;
    __strtod_l; __strtof_l; __strtol_l; __strtold_l; __strtoll_l; __strtoul_l;
    __strtoull_l; __strxfrm_l; __toascii_l; __tolower_l; __toupper_l;
    __towctrans_l; __towlower_l; __towupper_l; __wcscasecmp_l; __wcscoll_l;
    __wcsncasecmp_l; __wcstod_l; __wcstof_l; __wcstol_l; __wcstold_l;
    __wcstoll_l; __wcstoul_l; __wcstoull_l; __wcsxfrm_l; __wctype_l;
  }
  GLIBC_2.2 {
    # The data structure changed.
    localeconv;

    # more functions from the experimental locale implementation
    __wctrans_l;

    # missing function from the experimental locale implementation
    __nl_langinfo_l;
  }
}