toolchain/eglibc/config/Config.in

   1 config EGLIBC_OPTION_EGLIBC_ADVANCED_INET6
   2    bool "IPv6 Advanced Sockets API support (RFC3542)"
   3    default y
   4    depends EGLIBC_OPTION_EGLIBC_INET
   5    help
   6        This option group includes the functions specified by RFC 3542,
   7        "Advanced Sockets Application Program Interface (API) for
   8        IPv6".
   9
  10        This option group includes the following functions:
  11
  12          inet6_opt_append
  13          inet6_opt_find
  14          inet6_opt_finish
  15          inet6_opt_get_val
  16          inet6_opt_init
  17          inet6_alloc
  18          inet6_append
  19          inet6_find
  20          inet6_init
  21          inet6_next
  22          inet6_space
  23          inet6_opt_next
  24          inet6_opt_set_val
  25          inet6_rth_add
  26          inet6_rth_getaddr
  27          inet6_rth_init
  28          inet6_rth_reverse
  29          inet6_rth_segments
  30          inet6_rth_space
  31
  32 config EGLIBC_OPTION_EGLIBC_BACKTRACE
  33    bool "Functions for producing backtraces"
  34    default y
  35    help
  36        This option group includes functions for producing a list of
  37        the function calls that are currently active in a thread, from
  38        within the thread itself.  These functions are often used
  39        within signal handlers, to produce diagnostic output.
  40
  41        This option group includes the following functions:
  42
  43          backtrace
  44          backtrace_symbols
  45          backtrace_symbols_fd
  46
  47 config EGLIBC_OPTION_EGLIBC_BSD
  48    bool "BSD-specific functions, and their compatibility stubs"
  49    default y
  50    help
  51        This option group includes functions specific to BSD kernels.
  52        A number of these functions have stub versions that are also
  53        included in libraries built for non-BSD systems for
  54        compatibility.
  55
  56        This option group includes the following functions:
  57
  58          chflags
  59          fchflags
  60          lchmod
  61          revoke
  62          setlogin
  63
  64 config EGLIBC_OPTION_EGLIBC_CXX_TESTS
  65    bool "Tests that link against the standard C++ library."
  66    default y
  67    depends EGLIBC_OPTION_POSIX_WIDE_CHAR_DEVICE_IO
  68    depends EGLIBC_OPTION_EGLIBC_LIBM
  69    help
  70        This option group does not include any C library functions;
  71        instead, it controls which EGLIBC tests an ordinary 'make
  72        tests' runs.  With this group disabled, tests that would
  73        normally link against the standard C++ library are not
  74        run.
  75
  76        The standard C++ library depends on the math library 'libm' and
  77        the wide character I/O functions included in EGLIBC.  If those
  78        option groups are disabled, this test must also be disabled.
  79
  80 config EGLIBC_OPTION_EGLIBC_CATGETS
  81    bool "Functions for accessing message catalogs"
  82    default y
  83    depends EGLIBC_OPTION_EGLIBC_LOCALE_CODE
  84    help
  85        This option group includes functions for accessing message
  86        catalogs: catopen, catclose, and catgets.
  87
  88        This option group depends on the EGLIBC_LOCALE_CODE
  89        option group; if you disable that, you must also disable this.
  90
  91 config EGLIBC_OPTION_EGLIBC_CHARSETS
  92    bool "iconv/gconv character set conversion libraries"
  93    default y
  94    help
  95
  96        This option group includes support for character sets other
  97        than ASCII (ANSI_X3.4-1968) and Unicode and ISO-10646 in their
  98        various encodings.  This affects both the character sets
  99        supported by the wide and multibyte character functions, and
 100        those supported by the 'iconv' functions.
 101
 102        With this option group disabled, EGLIBC supports only the
 103        following character sets:
 104
 105           ANSI_X3.4         - ASCII
 106           ANSI_X3.4-1968
 107           ANSI_X3.4-1986
 108           ASCII
 109           CP367
 110           CSASCII
 111           IBM367
 112           ISO-IR-6
 113           ISO646-US
 114           ISO_646.IRV:1991
 115           OSF00010020
 116           US
 117           US-ASCII
 118
 119           10646-1:1993      - ISO 10646, in big-endian UCS4 form
 120           10646-1:1993/UCS4
 121           CSUCS4
 122           ISO-10646
 123           ISO-10646/UCS4
 124           OSF00010104
 125           OSF00010105
 126           OSF00010106
 127           UCS-4
 128           UCS-4BE
 129           UCS4
 130
 131           UCS-4LE           - ISO 10646, in little-endian UCS4 form
 132
 133           ISO-10646/UTF-8   - ISO 10646, in UTF-8 form
 134           ISO-10646/UTF8
 135           ISO-IR-193
 136           OSF05010001
 137           UTF-8
 138           UTF8
 139
 140           ISO-10646/UCS2    - ISO 10646, in target-endian UCS2 form
 141           OSF00010100
 142           OSF00010101
 143           OSF00010102
 144           UCS-2
 145           UCS2
 146
 147           UCS-2BE           - ISO 10646, in big-endian UCS2 form
 148           UNICODEBIG
 149
 150           UCS-2LE           - ISO 10646, in little-endian UCS2 form
 151           UNICODELITTLE
 152
 153           WCHAR_T           - EGLIBC's internal form (target-endian,
 154                               32-bit ISO 10646)
 155
 156 config EGLIBC_OPTION_EGLIBC_DB_ALIASES
 157    bool "Functions for accessing the mail aliases database"
 158    default y
 159    help
 160        This option group includes functions for looking up mail
 161        aliases in '/etc/aliases' or using nsswitch.  It includes the
 162        following functions:
 163
 164          endaliasent
 165          getaliasbyname
 166          getaliasbyname_r
 167          getaliasent
 168          getaliasent_r
 169          setaliasent
 170
 171        When this option group is disabled, the NSS service libraries
 172        also lack support for querying their mail alias tables.
 173
 174 config EGLIBC_OPTION_EGLIBC_ENVZ
 175    bool "Functions for handling envz-style environment vectors."
 176    default y
 177    help
 178        This option group contains functions for creating and operating
 179        on envz vectors.  An "envz vector" is a vector of strings in a
 180        contiguous block of memory, where each element is a name-value
 181        pair, and elements are separated from their neighbors by null
 182        characters.
 183
 184        This option group includes the following functions:
 185
 186         envz_add        envz_merge
 187         envz_entry      envz_remove
 188         envz_get        envz_strip
 189
 190 config EGLIBC_OPTION_EGLIBC_FCVT
 191    bool "Functions for converting floating-point numbers to strings"
 192    default y
 193    depends EGLIBC_VERSION_2_10
 194    help
 195        This option group includes functions for converting
 196        floating-point numbers to strings.
 197
 198        This option group includes the following functions:
 199
 200          ecvt           qecvt
 201          ecvt_r         qecvt_r
 202          fcvt           qfcvt
 203          fcvt_r         qfcvt_r
 204          gcvt           qgcvt
 205
 206 config EGLIBC_OPTION_EGLIBC_FMTMSG
 207    bool "Functions for formatting messages"
 208    default y
 209    depends EGLIBC_VERSION_2_10
 210    help
 211        This option group includes the following functions:
 212
 213          addseverity    fmtmsg
 214
 215 config EGLIBC_OPTION_EGLIBC_FSTAB
 216    bool "Access functions for 'fstab'"
 217    default y
 218    help
 219        This option group includes functions for reading the mount
 220        point specification table, '/etc/fstab'.  These functions are
 221        not included in the POSIX standard, which provides the
 222        'getmntent' family of functions instead.
 223
 224        This option group includes the following functions:
 225
 226          endfsent       getfsspec
 227          getfsent       setfsent
 228          getfsfile
 229
 230 config OPTION_EGLIBC_FTRAVERSE
 231    bool "Functions for traversing file hierarchies"
 232    default y
 233    depends EGLIBC_VERSION_2_10
 234    help
 235        This option group includes functions for traversing file
 236        UNIX file hierachies.
 237
 238        This option group includes the following functions:
 239
 240          fts_open       ftw
 241          fts_read       nftw
 242          fts_children   ftw64
 243          fts_set        nftw64
 244          fts_close
 245
 246 config EGLIBC_OPTION_EGLIBC_GETLOGIN
 247    bool "The getlogin function"
 248    default y
 249    depends EGLIBC_OPTION_EGLIBC_UTMP
 250    help
 251        This function group includes the 'getlogin' and 'getlogin_r'
 252        functions, which return the user name associated by the login
 253        activity with the current process's controlling terminal.
 254
 255        With this option group disabled, the 'glob' function will not
 256        fall back on 'getlogin' to find the user's login name for tilde
 257        expansion when the 'HOME' environment variable is not set.
 258
 259 config EGLIBC_OPTION_EGLIBC_INET
 260    bool "Networking support"
 261    default y
 262    help
 263        This option group includes networking-specific functions and
 264        data.  With EGLIBC_INET disabled, the EGLIBC
 265        installation and API changes as follows:
 266
 267        - The following libraries are not installed:
 268
 269          libanl
 270          libnsl
 271          libnss_compat
 272          libnss_dns
 273          libnss_hesiod
 274          libnss_nis
 275          libnss_nisplus
 276          libresolv
 277
 278        - The following functions and variables are omitted from libc:
 279
 280          authdes_create           hstrerror              svc_fdset
 281          authdes_getucred         htonl                  svc_getreq
 282          authdes_pk_create        htons                  svc_getreq_common
 283          authnone_create          if_freenameindex       svc_getreq_poll
 284          authunix_create          if_indextoname         svc_getreqset
 285          authunix_create_default  if_nameindex           svc_max_pollfd
 286          bindresvport             if_nametoindex         svc_pollfd
 287          callrpc                  in6addr_any            svcraw_create
 288          cbc_crypt                in6addr_loopback       svc_register
 289          clnt_broadcast           inet6_opt_append       svc_run
 290          clnt_create              inet6_opt_find         svc_sendreply
 291          clnt_pcreateerror        inet6_opt_finish       svctcp_create
 292          clnt_perrno              inet6_opt_get_val      svcudp_bufcreate
 293          clnt_perror              inet6_opt_init         svcudp_create
 294          clntraw_create           inet6_alloc     svcudp_enablecache
 295          clnt_spcreateerror       inet6_append    svcunix_create
 296          clnt_sperrno             inet6_find      svcunixfd_create
 297          clnt_sperror             inet6_init      svc_unregister
 298          clnttcp_create           inet6_next      user2netname
 299          clntudp_bufcreate        inet6_space     xdecrypt
 300          clntudp_create           inet6_opt_next         xdr_accepted_reply
 301          clntunix_create          inet6_opt_set_val      xdr_array
 302          des_setparity            inet6_rth_add          xdr_authdes_cred
 303          ecb_crypt                inet6_rth_getaddr      xdr_authdes_verf
 304          endaliasent              inet6_rth_init         xdr_authunix_parms
 305          endhostent               inet6_rth_reverse      xdr_bool
 306          endnetent                inet6_rth_segments     xdr_bytes
 307          endnetgrent              inet6_rth_space        xdr_callhdr
 308          endprotoent              inet_addr              xdr_callmsg
 309          endrpcent                inet_aton              xdr_char
 310          endservent               inet_lnaof             xdr_cryptkeyarg
 311          ether_aton               inet_makeaddr          xdr_cryptkeyarg2
 312          ether_aton_r             inet_netof             xdr_cryptkeyres
 313          ether_hostton            inet_network           xdr_des_block
 314          ether_line               inet_nsap_addr         xdr_double
 315          ether_ntoa               inet_nsap_ntoa         xdr_enum
 316          ether_ntoa_r             inet_ntoa              xdr_float
 317          ether_ntohost            inet_ntop              xdr_free
 318          freeaddrinfo             inet_pton              xdr_getcredres
 319          freeifaddrs              innetgr                xdr_hyper
 320          gai_strerror             iruserok               xdr_int
 321          getaddrinfo              iruserok_af            xdr_int16_t
 322          getaliasbyname           key_decryptsession     xdr_int32_t
 323          getaliasbyname_r         key_decryptsession_pk  xdr_int64_t
 324          getaliasent              key_encryptsession     xdr_int8_t
 325          getaliasent_r            key_encryptsession_pk  xdr_keybuf
 326          gethostbyaddr            key_gendes             xdr_key_netstarg
 327          gethostbyaddr_r          key_get_conv           xdr_key_netstres
 328          gethostbyname            key_secretkey_is_set   xdr_keystatus
 329          gethostbyname2           key_setnet             xdr_long
 330          gethostbyname2_r         key_setsecret          xdr_longlong_t
 331          gethostbyname_r          netname2host           xdrmem_create
 332          gethostent               netname2user           xdr_netnamestr
 333          gethostent_r             ntohl                  xdr_netobj
 334          getifaddrs               ntohs                  xdr_opaque
 335          getipv4sourcefilter      passwd2des             xdr_opaque_auth
 336          get_myaddress            pmap_getmaps           xdr_pmap
 337          getnameinfo              pmap_getport           xdr_pmaplist
 338          getnetbyaddr             pmap_rmtcall           xdr_pointer
 339          getnetbyaddr_r           pmap_set               xdr_quad_t
 340          getnetbyname             pmap_unset             xdrrec_create
 341          getnetbyname_r           rcmd                   xdrrec_endofrecord
 342          getnetent                rcmd_af                xdrrec_eof
 343          getnetent_r              registerrpc            xdrrec_skiprecord
 344          getnetgrent              res_init               xdr_reference
 345          getnetgrent_r            rexec                  xdr_rejected_reply
 346          getnetname               rexec_af               xdr_replymsg
 347          getprotobyname           rexecoptions           xdr_rmtcall_args
 348          getprotobyname_r         rpc_createerr          xdr_rmtcallres
 349          getprotobynumber         rresvport              xdr_short
 350          getprotobynumber_r       rresvport_af           xdr_sizeof
 351          getprotoent              rtime                  xdrstdio_create
 352          getprotoent_r            ruserok                xdr_string
 353          getpublickey             ruserok_af             xdr_u_char
 354          getrpcbyname             ruserpass              xdr_u_hyper
 355          getrpcbyname_r           setaliasent            xdr_u_int
 356          getrpcbynumber           sethostent             xdr_uint16_t
 357          getrpcbynumber_r         setipv4sourcefilter    xdr_uint32_t
 358          getrpcent                setnetent              xdr_uint64_t
 359          getrpcent_r              setnetgrent            xdr_uint8_t
 360          getrpcport               setprotoent            xdr_u_long
 361          getsecretkey             setrpcent              xdr_u_longlong_t
 362          getservbyname            setservent             xdr_union
 363          getservbyname_r          setsourcefilter        xdr_unixcred
 364          getservbyport            svcauthdes_stats       xdr_u_quad_t
 365          getservbyport_r          svcerr_auth            xdr_u_short
 366          getservent               svcerr_decode          xdr_vector
 367          getservent_r             svcerr_noproc          xdr_void
 368          getsourcefilter          svcerr_noprog          xdr_wrapstring
 369          h_errlist                svcerr_progvers        xencrypt
 370          h_errno                  svcerr_systemerr       xprt_register
 371          herror                   svcerr_weakauth        xprt_unregister
 372          h_nerr                   svc_exit
 373          host2netname             svcfd_create
 374
 375        - The rpcgen, nscd, and rpcinfo commands are not installed.
 376
 377        - The 'rpc' file (a text file listing RPC services) is not installed.
 378
 379        Socket-related system calls do not fall in this option group,
 380        because many are also used for other inter-process
 381        communication mechanisms.  For example, the 'syslog' routines
 382        use Unix-domain sockets to communicate with the syslog daemon;
 383        syslog is valuable in non-networked contexts.
 384
 385 config EGLIBC_OPTION_EGLIBC_LIBM
 386    bool "libm (math library)"
 387    default y
 388    help
 389        This option group includes the 'libm' library, containing
 390        mathematical functions.  If this option group is omitted, then
 391        an EGLIBC installation does not include shared or unshared versions
 392        of the math library.
 393
 394        Note that this does not remove all floating-point related
 395        functionality from EGLIBC; for example, 'printf' and 'scanf'
 396        can still print and read floating-point values with this option
 397        group disabled.
 398
 399        Note that the ISO Standard C++ library 'libstdc++' depends on
 400        EGLIBC's math library 'libm'.  If you disable this option
 401        group, you will not be able to build 'libstdc++' against the
 402        resulting EGLIBC installation.
 403
 404 config EGLIBC_OPTION_EGLIBC_LOCALES
 405    bool "Locale definitions"
 406    default y
 407    help
 408        This option group includes all locale definitions other than
 409        that for the "C" locale.  If this option group is omitted, then
 410        only the "C" locale is supported.
 411
 412
 413 config EGLIBC_OPTION_EGLIBC_LOCALE_CODE
 414    bool "Locale functions"
 415    default y
 416    depends EGLIBC_OPTION_POSIX_C_LANG_WIDE_CHAR
 417    help
 418        This option group includes locale support functions, programs,
 419        and libraries.  With EGLIBC_LOCALE_FUNCTIONS disabled,
 420        EGLIBC supports only the 'C' locale (also known as 'POSIX'),
 421        and ignores the settings of the 'LANG' and 'LC_*' environment
 422        variables.
 423
 424        With EGLIBC_LOCALE_CODE disabled, the following
 425        functions are omitted from libc:
 426
 427          duplocale   localeconv  nl_langinfo    rpmatch  strfmon_l
 428          freelocale  newlocale   nl_langinfo_l  strfmon  uselocale
 429
 430        Furthermore, only the LC_CTYPE and LC_TIME categories of the
 431        standard "C" locale are available.
 432
 433        The EGLIBC_CATGETS option group depends on this option
 434        group; if you disable EGLIBC_LOCALE_CODE, you must also
 435        disable EGLIBC_CATGETS.
 436
 437 config EGLIBC_OPTION_EGLIBC_NIS
 438    bool "Support for NIS, NIS+, and the special 'compat' services."
 439    default y
 440    depends EGLIBC_OPTION_EGLIBC_INET
 441    depends EGLIBC_OPTION_EGLIBC_SUNRPC
 442    help
 443        This option group includes the NIS, NIS+, and 'compat' Name
 444        Service Switch service libraries.  When it is disabled, those
 445        services libraries are not installed; you should remove any
 446        references to them from your 'nsswitch.conf' file.
 447
 448        This option group depends on the EGLIBC_INET option
 449        group; you must enable that to enable this option group.
 450
 451 config EGLIBC_OPTION_EGLIBC_NSSWITCH
 452    bool "Name service switch (nsswitch) support"
 453    default y
 454    help
 455
 456        This option group includes support for the 'nsswitch' facility.
 457        With this option group enabled, all EGLIBC functions for
 458        accessing various system databases (passwords and groups;
 459        networking; aliases; public keys; and so on) consult the
 460        '/etc/nsswitch.conf' configuration file to decide how to handle
 461        queries.
 462
 463        With this option group disabled, EGLIBC uses a fixed list of
 464        services to satisfy queries on each database, as requested by
 465        configuration files specified when EGLIBC is built.  Your
 466        'option-groups.config' file must set the following two
 467        variables:
 468
 469        EGLIBC_NSSWITCH_FIXED_CONFIG
 470
 471           Set this to the name of a file whose contents observe the
 472           same syntax as an ordinary '/etc/nsswitch.conf' file.  The
 473           EGLIBC build process parses this file just as EGLIBC would
 474           at run time if EGLIBC_NSSWITCH were enabled, and
 475           produces a C library that uses the nsswitch service
 476           libraries to search for database entries as this file
 477           specifies, instead of consulting '/etc/nsswitch.conf' at run
 478           time.
 479
 480           This should be an absolute filename.  The EGLIBC build
 481           process may use it from several different working
 482           directories.  It may include references to Makefile
 483           variables like 'common-objpfx' (the top of the build tree,
 484           with a trailing slash), or '..' (the top of the source tree,
 485           with a trailing slash).
 486
 487           The EGLIBC source tree includes a sample configuration file
 488           named 'nss/fixed-nsswitch.conf'; for simple configurations,
 489           you will probably want to delete references to databases not
 490           needed on your system.
 491
 492        EGLIBC_NSSWITCH_FIXED_FUNCTIONS
 493
 494           The EGLIBC build process uses this file to decide which
 495           functions to make available from which service libraries.
 496           The file 'nss/fixed-nsswitch.functions' serves as a sample
 497           configuration file for this setting, and explains its syntax
 498           and meaning in more detail.
 499
 500           This should be an absolute file name.  The EGLIBC build
 501           process may use it from several different working
 502           directories.  It may include references to Makefile
 503           variables like 'common-objpfx' (the top of the build tree,
 504           with a trailing slash), or '..' (the top of the source tree,
 505           with a trailing slash).
 506
 507           Be sure to mention each function in each service you wish to
 508           use.  If you do not mention a service's function here, the
 509           EGLIBC database access functions will not find it, even if
 510           it is listed in the EGLIBC_NSSWITCH_FIXED_CONFIG
 511           file.
 512
 513        In this arrangement, EGLIBC will not use the 'dlopen' and
 514        'dlsym' functions to find database access functions.  Instead,
 515        libc hard-codes references to the service libraries' database
 516        access functions.  You must explicitly link your program
 517        against the name service libraries (those whose names start
 518        with 'libnss_', in the sysroot's '/lib' directory) whose
 519        functions you intend to use.  This arrangement helps
 520        system-wide static analysis tools decide which functions a
 521        system actually uses.
 522
 523        Note that some nsswitch service libraries require other option
 524        groups to be enabled; for example, the EGLIBC_INET
 525        option group must be enabled to use the 'libnss_dns.so.2'
 526        service library, which uses the Domain Name System network
 527        protocol to answer queries.
 528
 529 config EGLIBC_OPTION_EGLIBC_RCMD
 530    bool "Support for 'rcmd' and related library functions"
 531    default y
 532    depends EGLIBC_OPTION_EGLIBC_INET
 533    help
 534       This option group includes functions for running commands on
 535       remote machines via the 'rsh' protocol, and doing authentication
 536       related to those functions.  This also includes functions that
 537       use the 'rexec' protocol.
 538
 539       This option group includes the following functions:
 540
 541         rcmd            ruserok
 542         rcmd_af         ruserok_af
 543         rexec           iruserok
 544         rexec_af        iruserok_af
 545         rresvport       ruserpass
 546         rresvport_af
 547
 548 config EGLIBC_OPTION_EGLIBC_SPAWN
 549    bool "Support for POSIX posix_spawn functions"
 550    default y
 551    help
 552       This option group includes the POSIX functions for executing
 553       programs in child processes without using 'fork' or 'vfork'.
 554
 555       This option group includes the following functions:
 556
 557         posix_spawn
 558         posix_spawnattr_destroy
 559         posix_spawnattr_getflags
 560         posix_spawnattr_getpgroup
 561         posix_spawnattr_getschedparam
 562         posix_spawnattr_getschedpolicy
 563         posix_spawnattr_getsigdefault
 564         posix_spawnattr_getsigmask
 565         posix_spawnattr_init
 566         posix_spawnattr_setflags
 567         posix_spawnattr_setpgroup
 568         posix_spawnattr_setschedparam
 569         posix_spawnattr_setschedpolicy
 570         posix_spawnattr_setsigdefault
 571         posix_spawnattr_setsigmask
 572         posix_spawn_file_actions_addclose
 573         posix_spawn_file_actions_adddup2
 574         posix_spawn_file_actions_addopen
 575         posix_spawn_file_actions_destroy
 576         posix_spawn_file_actions_init
 577         posix_spawnp
 578
 579       This option group also provides the ability for the iconv,
 580       localedef, and locale programs to operate transparently on
 581       compressed charset definitions.  When this option group is
 582       disabled, those programs will only operate on uncompressed
 583       charmap files.
 584
 585 config EGLIBC_OPTION_EGLIBC_STREAMS
 586    bool "Support for accessing STREAMS."
 587    default y
 588    help
 589       This option group includes functions for reading and writing
 590       messages to and from STREAMS.  The STREAMS interface provides a
 591       uniform mechanism for implementing networking services and other
 592       character-based I/O.  (STREAMS are not to be confused with
 593       <stdio.h> FILE objects, also called 'streams'.)
 594
 595       This option group includes the following functions:
 596
 597         getmsg          putpmsg
 598         getpmsg         fattach
 599         isastream       fdetach
 600         putmsg
 601
 602 config EGLIBC_OPTION_EGLIBC_SUNRPC
 603    bool "Support for the Sun 'RPC' protocol."
 604    default y
 605    depends EGLIBC_OPTION_EGLIBC_INET
 606    help
 607       This option group includes support for the Sun RPC protocols,
 608       including the 'rpcgen' and 'rpcinfo' programs.
 609
 610 config EGLIBC_OPTION_EGLIBC_UTMP
 611    bool "Older access functions for 'utmp' login records"
 612    default y
 613    help
 614        This option group includes the older 'utent' family of
 615        functions for accessing user login records in the 'utmp' file.
 616        POSIX omits these functions in favor of the 'utxent' family,
 617        and they are obsolete on systems other than Linux.
 618
 619        This option group includes the following functions:
 620
 621          endutent
 622          getutent
 623          getutent_r
 624          getutid
 625          getutid_r
 626          getutline
 627          getutline_r
 628          logwtmp
 629          pututline
 630          setutent
 631          updwtmp
 632          utmpname
 633
 634        This option group includes the following libraries:
 635
 636          libutil.so (and libutil.a)
 637
 638 config EGLIBC_OPTION_EGLIBC_UTMPX
 639    bool "POSIX access functions for 'utmp' login records"
 640    default y
 641    depends EGLIBC_OPTION_EGLIBC_UTMP
 642    help
 643        This option group includes the POSIX functions for reading and
 644        writing user login records in the 'utmp' file (usually
 645        '/var/run/utmp').  The POSIX functions operate on 'struct
 646        utmpx' structures, as opposed to the family of older 'utent'
 647        functions, which operate on 'struct utmp' structures.
 648
 649        This option group includes the following functions:
 650
 651          endutxent
 652          getutmp
 653          getutmpx
 654          getutxent
 655          getutxid
 656          getutxline
 657          pututxline
 658          setutxent
 659          updwtmpx
 660          utmpxname
 661
 662 config EGLIBC_OPTION_EGLIBC_WORDEXP
 663    bool "Shell-style word expansion"
 664    default y
 665    help
 666         This option group includes the 'wordexp' function for
 667         performing word expansion in the manner of the shell, and the
 668         accompanying 'wordfree' function.
 669
 670 config EGLIBC_OPTION_POSIX_C_LANG_WIDE_CHAR
 671    bool "ISO C library wide character functions, excluding I/O"
 672    default y
 673    help
 674         This option group includes the functions defined by the ISO C
 675         standard for working with wide and multibyte characters in
 676         memory.  Functions for reading and writing wide and multibyte
 677         characters from and to files call in the
 678         POSIX_WIDE_CHAR_DEVICE_IO option group.
 679
 680         This option group includes the following functions:
 681
 682           btowc         mbsinit       wcscspn       wcstoll
 683           iswalnum      mbsrtowcs     wcsftime      wcstombs
 684           iswalpha      mbstowcs      wcslen        wcstoul
 685           iswblank      mbtowc        wcsncat       wcstoull
 686           iswcntrl      swprintf      wcsncmp       wcstoumax
 687           iswctype      swscanf       wcsncpy       wcsxfrm
 688           iswdigit      towctrans     wcspbrk       wctob
 689           iswgraph      towlower      wcsrchr       wctomb
 690           iswlower      towupper      wcsrtombs     wctrans
 691           iswprint      vswprintf     wcsspn        wctype
 692           iswpunct      vswscanf      wcsstr        wmemchr
 693           iswspace      wcrtomb       wcstod        wmemcmp
 694           iswupper      wcscat        wcstof        wmemcpy
 695           iswxdigit     wcschr        wcstoimax     wmemmove
 696           mblen         wcscmp        wcstok        wmemset
 697           mbrlen        wcscoll       wcstol
 698           mbrtowc       wcscpy        wcstold
 699
 700 config EGLIBC_OPTION_POSIX_REGEXP
 701    bool "Regular expressions"
 702    default y
 703    help
 704         This option group includes the POSIX regular expression
 705         functions, and the associated non-POSIX extensions and
 706         compatibility functions.
 707
 708         With POSIX_REGEXP disabled, the following functions are
 709         omitted from libc:
 710
 711           re_comp                 re_max_failures         regcomp
 712           re_compile_fastmap      re_search               regerror
 713           re_compile_pattern      re_search_2             regexec
 714           re_exec                 re_set_registers        regfree
 715           re_match                re_set_syntax           rpmatch
 716           re_match_2              re_syntax_options
 717
 718         Furthermore, the compatibility regexp interface defined in the
 719         <regexp.h> header file, 'compile', 'step', and 'advance', is
 720         omitted.
 721
 722 config EGLIBC_OPTION_POSIX_REGEXP_GLIBC
 723    bool "Regular expressions from GLIBC"
 724    default y
 725    depends EGLIBC_OPTION_POSIX_REGEXP
 726    depends EGLIBC_VERSION_2_10
 727    help
 728         This option group specifies which regular expression
 729         library to use.  The choice is between regex
 730         implementation from GLIBC and regex implementation from
 731         libiberty.  The GLIBC variant is fully POSIX conformant and
 732         optimized for speed; regex from libiberty is more than twice
 733         as small while still is enough for most practical purposes.
 734
 735 config EGLIBC_OPTION_POSIX_WIDE_CHAR_DEVICE_IO
 736    bool "Input and output functions for wide characters"
 737    default y
 738    depends EGLIBC_OPTION_POSIX_C_LANG_WIDE_CHAR
 739    help
 740         This option group includes functions for reading and writing
 741         wide characters to and from <stdio.h> streams.
 742
 743         This option group includes the following functions:
 744
 745           fgetwc        fwprintf      putwchar      vwscanf
 746           fgetws        fwscanf       ungetwc       wprintf
 747           fputwc        getwc         vfwprintf     wscanf
 748           fputws        getwchar      vfwscanf
 749           fwide         putwc         vwprintf
 750
 751         This option group further includes the following unlocked
 752         variants of the above functions:
 753
 754           fgetwc_unlocked           getwc_unlocked
 755           fgetws_unlocked           getwchar_unlocked
 756           fputwc_unlocked           putwc_unlocked
 757           fputws_unlocked           putwchar_unlocked
 758
 759         Note that the GNU standard C++ library, 'libstdc++.so', uses
 760         some of these functions; you will not be able to link or run
 761         C++ programs if you disable this option group.
 762
 763         This option group also affects the behavior of the following
 764         functions:
 765
 766           fdopen
 767           fopen
 768           fopen64
 769           freopen
 770           freopen64
 771
 772         These functions all take an OPENTYPE parameter which may
 773         contain a string of the form ",ccs=CHARSET", indicating that
 774         the underlying file uses the character set named CHARSET.
 775         This produces a wide-oriented stream, which is only useful
 776         when the functions included in this option group are present.
 777         If the user attempts to open a file specifying a character set
 778         in the OPENTYPE parameter, and EGLIBC was built with this
 779         option group disabled, the function returns NULL, and sets
 780         errno to EINVAL.