path: root/libc/option-groups.def

# This file documents the option groups EGLIBC currently supports, in
# a format akin to the Linux Kconfig system's.  The syntax may change
# over time.
#
# An entry of the form:
#
#   config OPTION_GROUP_NAME
#       bool "one-line explanation of what this option group controls"
#       help
#           Multi-line help explaining the option group's meaning in
#           some detail, terminated by indentation level.
#
# defines an option group whose variable is OPTION_GROUP_NAME, with
# meaningful values 'y' (enabled) and 'n' (disabled).  The
# documentation is formatted to be consumed by some sort of
# interactive configuration interface, but EGLIBC doesn't have such an
# interface yet.
#
# An option may have a 'depends' line, indicating which other options
# must also be enabled if this option is.  At present, EGLIBC doesn't
# check that these dependencies are satisfied.
# 
# Option group variables get their default values from the file
# 'option-groups.defaults', in the top directory of the EGLIBC source
# tree.  By default, all EGLIBC option groups are enabled --- their
# variables are set to 'y'.
#
# After including 'option-groups.defaults', the EGLIBC make machinery
# includes the file 'option-groups.config' from the top of the build
# tree, if it is present.  Developers can place assignments to option
# group variables in that file to override the defaults.  For example,
# to disable an option group, place a line of the form:
#
#    OPTION_GROUP_NAME = n
#
# in 'option-groups.config' at the top of your build tree.  To
# explicitly enable an option group, you may also write:
#
#    OPTION_GROUP_NAME = y
# 
# although this simply reestablishes the value already set by
# 'option-groups.defaults'.

config OPTION_EGLIBC_CATGETS
   bool "Functions for accessing message catalogs"
   depends OPTION_EGLIBC_LOCALE_CODE
   help
       This option group includes functions for accessing message
       catalogs: catopen, catclose, and catgets.

       This option group depends on the OPTION_EGLIBC_LOCALE_CODE
       option group; if you disable that, you must also disable this.

config OPTION_EGLIBC_CHARSETS
   bool "iconv/gconv character set conversion libraries"
   help

       This option group includes support for character sets other
       than ASCII (ANSI_X3.4-1968) and Unicode and ISO-10646 in their
       various encodings.  This affects both the character sets
       supported by the wide and multibyte character functions, and
       those supported by the 'iconv' functions.

       With this option group disabled, EGLIBC supports only the
       following character sets:

          ANSI_X3.4         - ASCII
          ANSI_X3.4-1968
          ANSI_X3.4-1986
          ASCII
          CP367
          CSASCII
          IBM367
          ISO-IR-6
          ISO646-US
          ISO_646.IRV:1991
          OSF00010020
          US
          US-ASCII

          10646-1:1993      - ISO 10646, in big-endian UCS4 form
          10646-1:1993/UCS4
          CSUCS4
          ISO-10646
          ISO-10646/UCS4
          OSF00010104
          OSF00010105
          OSF00010106
          UCS-4
          UCS-4BE
          UCS4

          UCS-4LE           - ISO 10646, in little-endian UCS4 form

          ISO-10646/UTF-8   - ISO 10646, in UTF-8 form
          ISO-10646/UTF8
          ISO-IR-193
          OSF05010001
          UTF-8
          UTF8

          ISO-10646/UCS2    - ISO 10646, in target-endian UCS2 form
          OSF00010100
          OSF00010101
          OSF00010102
          UCS-2
          UCS2

          UCS-2BE           - ISO 10646, in big-endian UCS2 form
          UNICODEBIG

          UCS-2LE           - ISO 10646, in little-endian UCS2 form
          UNICODELITTLE

          WCHAR_T           - EGLIBC's internal form (target-endian,
                              32-bit ISO 10646)

config OPTION_EGLIBC_ENVZ
   bool "Functions for handling envz-style environment vectors."
   help
       This option group contains functions for creating and operating
       on envz vectors.  An "envz vector" is a vector of strings in a
       contiguous block of memory, where each element is a name-value
       pair, and elements are separated from their neighbors by null
       characters.

       This option group includes the following functions:

        envz_add        envz_merge 
        envz_entry      envz_remove
        envz_get        envz_strip 

config OPTION_EGLIBC_FSTAB
   bool "Access functions for 'fstab'"
   help
       This option group includes functions for reading the mount
       point specification table, '/etc/fstab'.  These functions are
       not included in the POSIX standard, which provides the
       'getmntent' family of functions instead.

       This option group includues the following functions:

         endfsent       getfsspec
         getfsent       setfsent
         getfsfile

config OPTION_EGLIBC_INET
   bool "Networking support"
   help
       This option group includes networking-specific functions and
       data.  With OPTION_EGLIBC_INET disabled, the EGLIBC
       installation and API changes as follows:

       - The following libraries are not installed:

         libanl
         libnsl
         libnss_compat
         libnss_dns
         libnss_hesiod
         libnss_nis
         libnss_nisplus
         libresolv
         
       - The following functions and variables are omitted from libc:

         authdes_create           hstrerror              svc_fdset
         authdes_getucred         htonl                  svc_getreq
         authdes_pk_create        htons                  svc_getreq_common
         authnone_create          if_freenameindex       svc_getreq_poll
         authunix_create          if_indextoname         svc_getreqset
         authunix_create_default  if_nameindex           svc_max_pollfd
         bindresvport             if_nametoindex         svc_pollfd
         callrpc                  in6addr_any            svcraw_create
         cbc_crypt                in6addr_loopback       svc_register
         clnt_broadcast           inet6_opt_append       svc_run
         clnt_create              inet6_opt_find         svc_sendreply
         clnt_pcreateerror        inet6_opt_finish       svctcp_create
         clnt_perrno              inet6_opt_get_val      svcudp_bufcreate
         clnt_perror              inet6_opt_init         svcudp_create
         clntraw_create           inet6_option_alloc     svcudp_enablecache
         clnt_spcreateerror       inet6_option_append    svcunix_create
         clnt_sperrno             inet6_option_find      svcunixfd_create
         clnt_sperror             inet6_option_init      svc_unregister
         clnttcp_create           inet6_option_next      user2netname
         clntudp_bufcreate        inet6_option_space     xdecrypt
         clntudp_create           inet6_opt_next         xdr_accepted_reply
         clntunix_create          inet6_opt_set_val      xdr_array
         des_setparity            inet6_rth_add          xdr_authdes_cred
         ecb_crypt                inet6_rth_getaddr      xdr_authdes_verf
         endaliasent              inet6_rth_init         xdr_authunix_parms
         endhostent               inet6_rth_reverse      xdr_bool
         endnetent                inet6_rth_segments     xdr_bytes
         endnetgrent              inet6_rth_space        xdr_callhdr
         endprotoent              inet_addr              xdr_callmsg
         endrpcent                inet_aton              xdr_char
         endservent               inet_lnaof             xdr_cryptkeyarg
         ether_aton               inet_makeaddr          xdr_cryptkeyarg2
         ether_aton_r             inet_netof             xdr_cryptkeyres
         ether_hostton            inet_network           xdr_des_block
         ether_line               inet_nsap_addr         xdr_double
         ether_ntoa               inet_nsap_ntoa         xdr_enum
         ether_ntoa_r             inet_ntoa              xdr_float
         ether_ntohost            inet_ntop              xdr_free
         freeaddrinfo             inet_pton              xdr_getcredres
         freeifaddrs              innetgr                xdr_hyper
         gai_strerror             iruserok               xdr_int
         getaddrinfo              iruserok_af            xdr_int16_t
         getaliasbyname           key_decryptsession     xdr_int32_t
         getaliasbyname_r         key_decryptsession_pk  xdr_int64_t
         getaliasent              key_encryptsession     xdr_int8_t
         getaliasent_r            key_encryptsession_pk  xdr_keybuf
         gethostbyaddr            key_gendes             xdr_key_netstarg
         gethostbyaddr_r          key_get_conv           xdr_key_netstres
         gethostbyname            key_secretkey_is_set   xdr_keystatus
         gethostbyname2           key_setnet             xdr_long
         gethostbyname2_r         key_setsecret          xdr_longlong_t
         gethostbyname_r          netname2host           xdrmem_create
         gethostent               netname2user           xdr_netnamestr
         gethostent_r             ntohl                  xdr_netobj
         getifaddrs               ntohs                  xdr_opaque
         getipv4sourcefilter      passwd2des             xdr_opaque_auth
         get_myaddress            pmap_getmaps           xdr_pmap
         getnameinfo              pmap_getport           xdr_pmaplist
         getnetbyaddr             pmap_rmtcall           xdr_pointer
         getnetbyaddr_r           pmap_set               xdr_quad_t
         getnetbyname             pmap_unset             xdrrec_create
         getnetbyname_r           rcmd                   xdrrec_endofrecord
         getnetent                rcmd_af                xdrrec_eof
         getnetent_r              registerrpc            xdrrec_skiprecord
         getnetgrent              res_init               xdr_reference
         getnetgrent_r            rexec                  xdr_rejected_reply
         getnetname               rexec_af               xdr_replymsg
         getprotobyname           rexecoptions           xdr_rmtcall_args
         getprotobyname_r         rpc_createerr          xdr_rmtcallres
         getprotobynumber         rresvport              xdr_short
         getprotobynumber_r       rresvport_af           xdr_sizeof
         getprotoent              rtime                  xdrstdio_create
         getprotoent_r            ruserok                xdr_string
         getpublickey             ruserok_af             xdr_u_char
         getrpcbyname             ruserpass              xdr_u_hyper
         getrpcbyname_r           setaliasent            xdr_u_int
         getrpcbynumber           sethostent             xdr_uint16_t
         getrpcbynumber_r         setipv4sourcefilter    xdr_uint32_t
         getrpcent                setnetent              xdr_uint64_t
         getrpcent_r              setnetgrent            xdr_uint8_t
         getrpcport               setprotoent            xdr_u_long
         getsecretkey             setrpcent              xdr_u_longlong_t
         getservbyname            setservent             xdr_union
         getservbyname_r          setsourcefilter        xdr_unixcred
         getservbyport            svcauthdes_stats       xdr_u_quad_t
         getservbyport_r          svcerr_auth            xdr_u_short
         getservent               svcerr_decode          xdr_vector
         getservent_r             svcerr_noproc          xdr_void
         getsourcefilter          svcerr_noprog          xdr_wrapstring
         h_errlist                svcerr_progvers        xencrypt
         h_errno                  svcerr_systemerr       xprt_register
         herror                   svcerr_weakauth        xprt_unregister
         h_nerr                   svc_exit
         host2netname             svcfd_create

       - The rpcgen, nscd, and rpcinfo commands are not installed.

       - The 'rpc' file (a text file listing RPC services) is not installed.

       Socket-related system calls do not fall in this option group,
       because many are also used for other inter-process
       communication mechanisms.  For example, the 'syslog' routines
       use Unix-domain sockets to communicate with the syslog daemon;
       syslog is valuable in non-networked contexts.

config OPTION_EGLIBC_LIBM
   bool "libm (math library)"
   help
       This option group includes the 'libm' library, containing
       mathematical functions.  If this option group is omitted, then
       an EGLIBC installation does not include shared or unshared versions
       of the math library.

       Note that this does not remove all floating-point related
       functionality from EGLIBC; for example, 'printf' and 'scanf'
       can still print and read floating-point values with this option
       group disabled.

       Note that the ISO Standard C++ library 'libstdc++' depends on
       EGLIBC's math library 'libm'.  If you disable this option
       group, you will not be able to build 'libstdc++' against the
       resulting EGLIBC installation.

config OPTION_EGLIBC_LOCALES
   bool "Locale definitions"
   help
       This option group includes all locale definitions other than
       that for the "C" locale.  If this option group is omitted, then
       only the "C" locale is supported.


config OPTION_EGLIBC_LOCALE_CODE
   bool "Locale functions"
   help
       This option group includes locale support functions, programs,
       and libraries.  With OPTION_EGLIBC_LOCALE_FUNCTIONS disabled,
       EGLIBC supports only the 'C' locale (also known as 'POSIX'),
       and ignores the settings of the 'LANG' and 'LC_*' environment
       variables.

       With OPTION_EGLIBC_LOCALE_CODE disabled, the following
       functions are omitted from libc:

         duplocale   localeconv  nl_langinfo    rpmatch  strfmon_l
         freelocale  newlocale   nl_langinfo_l  strfmon  uselocale

       Furthermore, only the LC_CTYPE and LC_TIME categories of the
       standard "C" locale are available.

       The OPTION_EGLIBC_CATGETS option group depends on this option
       group; if you disable OPTION_EGLIBC_LOCALE_CODE, you must also
       disable OPTION_EGLIBC_CATGETS.

config OPTION_EGLIBC_NIS
   bool "Support for NIS, NIS+, and the special 'compat' services."
   depends OPTION_EGLIBC_INET
   depends OPTION_EGLIBC_SUNRPC
   help
       This option group includes the NIS, NIS+, and 'compat' Name
       Service Switch service libraries.  When it is disabled, those
       services libraries are not installed; you should remove any
       references to them from your 'nsswitch.conf' file.

       This option group depends on the OPTION_EGLIBC_INET option
       group; you must enable that to enable this option group.

config OPTION_EGLIBC_NSSWITCH
   bool "Name service switch (nsswitch) support"
   help

       This option group includes support for the 'nsswitch' facility.
       With this option group enabled, all EGLIBC functions for
       accessing various system databases (passwords and groups;
       networking; aliases; public keys; and so on) consult the
       '/etc/nsswitch.conf' configuration file to decide how to handle
       queries.

       With this option group disabled, EGLIBC uses a fixed list of
       services to satisfy queries on each database, as requested by
       configuration files specified when EGLIBC is built.  Your
       'option-groups.config' file must set the following two
       variables:

       OPTION_EGLIBC_NSSWITCH_FIXED_CONFIG

          Set this to the name of a file whose contents observe the
          same syntax as an ordinary '/etc/nsswitch.conf' file.  The
          EGLIBC build process parses this file just as EGLIBC would
          at run time if OPTION_EGLIBC_NSSWITCH were enabled, and
          produces a C library that uses the nsswitch service
          libraries to search for database entries as this file
          specifies, instead of consulting '/etc/nsswitch.conf' at run
          time.

          This should be a relative file name; EGLIBC will look for it
          in the top build directory, along with the
          'option-groups.config' file.

          The EGLIBC source tree includes a sample configuration file
          named 'nss/fixed-nsswitch.conf'; for simple configurations,
          you will probably want to delete references to databases not
          needed on your system.

       OPTION_EGLIBC_NSSWITCH_FIXED_FUNCTIONS

          The EGLIBC build process uses this file to decide which
          functions to make available from which service libraries.
          The file 'nss/fixed-nsswitch.functions' serves as a sample
          configuration file for this setting, and explains its syntax
          and meaning in more detail.

          This should be a relative file name; EGLIBC will look for it
          in the top build directory, along with the
          'option-groups.config' file.

          Be sure to mention each function in each service you wish to
          use.  If you do not mention a service's function here, the
          EGLIBC database access functions will not find it, even if
          it is listed in the OPTION_EGLIBC_NSSWITCH_FIXED_CONFIG
          file.

       In this arrangement, EGLIBC will not use the 'dlopen' and
       'dlsym' functions to find database access functions.  Instead,
       libc hard-codes references to the service libraries' database
       access functions.  You must explicitly link your program
       against the name service libraries (those whose names start
       with 'libnss_', in the sysroot's '/lib' directory) whose
       functions you intend to use.  This arrangement helps
       system-wide static analysis tools decide which functions a
       system actually uses.

       Note that some nsswitch service libraries require other option
       groups to be enabled; for example, the OPTION_EGLIBC_INET
       option group must be enabled to use the 'libnss_dns.so.2' or
       'libnss_nis.so.2' service libraries, which use the Domain Name
       System and Network Information Service network protocols to
       answer queries.

config OPTION_EGLIBC_RCMD
   bool "Support for 'rcmd' and related library functions"
   depends OPTION_EGLIBC_INET
   help
      This option group includes functions for running commands on
      remote machines via the 'rsh' protocol, and doing authentication
      related to those functions.  This also includes functions that
      use the 'rexec' protocol.

      This option group includes the following functions:

        rcmd            ruserok
        rcmd_af         ruserok_af
        rexec           iruserok
        rexec_af        iruserok_af
        rresvport       ruserpass
        rresvport_af
        
config OPTION_EGLIBC_SPAWN
   bool "Support for POSIX posix_spawn functions"
   help
      This option group includes the POSIX functions for executing
      programs in child processes without using 'fork' or 'vfork'.

      This option group includes the following functions:

        posix_spawn
        posix_spawnattr_destroy
        posix_spawnattr_getflags
        posix_spawnattr_getpgroup
        posix_spawnattr_getschedparam
        posix_spawnattr_getschedpolicy
        posix_spawnattr_getsigdefault
        posix_spawnattr_getsigmask
        posix_spawnattr_init
        posix_spawnattr_setflags
        posix_spawnattr_setpgroup
        posix_spawnattr_setschedparam
        posix_spawnattr_setschedpolicy
        posix_spawnattr_setsigdefault
        posix_spawnattr_setsigmask
        posix_spawn_file_actions_addclose
        posix_spawn_file_actions_adddup2
        posix_spawn_file_actions_addopen
        posix_spawn_file_actions_destroy
        posix_spawn_file_actions_init
        posix_spawnp

      This option group also provides the ability for the iconv,
      localedef, and locale programs to operate transparently on
      compressed charset definitions.  When this option group is
      disabled, those programs will only operate on uncompressed
      charmap files.

config OPTION_EGLIBC_SUNRPC
   bool "Support for the Sun 'RPC' protocol."
   depends OPTION_EGLIBC_INET
   help
      This option group includes support for the Sun RPC protocols,
      including the 'rpcgen' and 'rpcinfo' programs.

config OPTION_POSIX_REGEXP
    bool "Regular expressions"
    help
        This option group includes the POSIX regular expression
        functions, and the associated non-POSIX extensions and
        compatibility functions.

        With OPTION_POSIX_REGEXP disabled, the following functions are
        omitted from libc:

          re_comp                 re_max_failures         regcomp
          re_compile_fastmap      re_search               regerror
          re_compile_pattern      re_search_2             regexec
          re_exec                 re_set_registers        regfree
          re_match                re_set_syntax           rpmatch
          re_match_2              re_syntax_options

        Furthermore, the compatibility regexp interface defined in the
        <regexp.h> header file, 'compile', 'step', and 'advance', is
        omitted.