toolchain/eglibc/config/Config.in

   1 config EGLIBC_OPTION_EGLIBC_ADVANCED_INET6
   2         bool "IPv6 Advanced Sockets API support (RFC3542)"
   3         default y
   4         select 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_option_alloc
  18                 inet6_option_append
  19                 inet6_option_find
  20                 inet6_option_init
  21                 inet6_option_next
  22                 inet6_option_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
  33 config EGLIBC_OPTION_EGLIBC_BACKTRACE
  34         bool "Functions for producing backtraces"
  35         default y
  36         help
  37           This option group includes functions for producing a list of
  38           the function calls that are currently active in a thread, from
  39           within the thread itself.  These functions are often used
  40           within signal handlers, to produce diagnostic output.
  41
  42           This option group includes the following functions:
  43
  44                 backtrace
  45                 backtrace_symbols
  46                 backtrace_symbols_fd
  47
  48
  49 config EGLIBC_OPTION_EGLIBC_BIG_MACROS
  50         bool "Use extensive inline code"
  51         default y
  52         depends EGLIBC_VERSION_2_11 ||  EGLIBC_VERSION_2_12
  53         help
  54           This option group specifies whether certain pieces of code
  55           should be inlined to achieve maximum speed.  If this option
  56           group is not selected, function calls will be used instead,
  57           hence reducing the library footprint.
  58
  59
  60 config EGLIBC_OPTION_EGLIBC_BSD
  61         bool "BSD-specific functions, and their compatibility stubs"
  62         default y
  63         help
  64           This option group includes functions specific to BSD kernels.
  65           A number of these functions have stub versions that are also
  66           included in libraries built for non-BSD systems for
  67           compatibility.
  68
  69           This option group includes the following functions:
  70
  71                 chflags
  72                 fchflags
  73                 lchmod
  74                 revoke
  75                 setlogin
  76
  77
  78 config EGLIBC_OPTION_EGLIBC_CXX_TESTS
  79         bool "Tests that link against the standard C++ library."
  80         default y
  81         select EGLIBC_OPTION_POSIX_WIDE_CHAR_DEVICE_IO
  82         select EGLIBC_OPTION_EGLIBC_LIBM
  83         help
  84           This option group does not include any C library functions;
  85           instead, it controls which EGLIBC tests an ordinary 'make
  86           tests' runs.  With this group disabled, tests that would
  87           normally link against the standard C++ library are not
  88           run.
  89
  90           The standard C++ library depends on the math library 'libm' and
  91           the wide character I/O functions included in EGLIBC.  If those
  92           option groups are disabled, this test must also be disabled.
  93
  94
  95 config EGLIBC_OPTION_EGLIBC_CATGETS
  96         bool "Functions for accessing message catalogs"
  97         default y
  98         select EGLIBC_OPTION_EGLIBC_LOCALE_CODE
  99         help
 100           This option group includes functions for accessing message
 101           catalogs: catopen, catclose, and catgets.
 102
 103           This option group depends on the EGLIBC_OPTION_EGLIBC_LOCALE_CODE
 104           option group; if you disable that, you must also disable this.
 105
 106
 107 config EGLIBC_OPTION_EGLIBC_CHARSETS
 108         bool "iconv/gconv character set conversion libraries"
 109         default y
 110         help
 111
 112           This option group includes support for character sets other
 113           than ASCII (ANSI_X3.4-1968) and Unicode and ISO-10646 in their
 114           various encodings.  This affects both the character sets
 115           supported by the wide and multibyte character functions, and
 116           those supported by the 'iconv' functions.
 117
 118           With this option group disabled, EGLIBC supports only the
 119           following character sets:
 120
 121                 ANSI_X3.4         - ASCII
 122                 ANSI_X3.4-1968
 123                 ANSI_X3.4-1986
 124                 ASCII
 125                 CP367
 126                 CSASCII
 127                 IBM367
 128                 ISO-IR-6
 129                 ISO646-US
 130                 ISO_646.IRV:1991
 131                 OSF00010020
 132                 US
 133                 US-ASCII
 134
 135                 10646-1:1993      - ISO 10646, in big-endian UCS4 form
 136                 10646-1:1993/UCS4
 137                 CSUCS4
 138                 ISO-10646
 139                 ISO-10646/UCS4
 140                 OSF00010104
 141                 OSF00010105
 142                 OSF00010106
 143                 UCS-4
 144                 UCS-4BE
 145                 UCS4
 146
 147                 UCS-4LE           - ISO 10646, in little-endian UCS4 form
 148
 149                 ISO-10646/UTF-8   - ISO 10646, in UTF-8 form
 150                 ISO-10646/UTF8
 151                 ISO-IR-193
 152                 OSF05010001
 153                 UTF-8
 154                 UTF8
 155
 156                 ISO-10646/UCS2    - ISO 10646, in target-endian UCS2 form
 157                 OSF00010100
 158                 OSF00010101
 159                 OSF00010102
 160                 UCS-2
 161                 UCS2
 162
 163                 UCS-2BE           - ISO 10646, in big-endian UCS2 form
 164                 UNICODEBIG
 165
 166                 UCS-2LE           - ISO 10646, in little-endian UCS2 form
 167                 UNICODELITTLE
 168
 169                 WCHAR_T           - EGLIBC's internal form (target-endian,
 170                                                         32-bit ISO 10646)
 171
 172
 173 config EGLIBC_OPTION_EGLIBC_CRYPT
 174         bool "Encryption library"
 175         default y
 176         depends EGLIBC_VERSION_2_12
 177         help
 178           This option group includes the `libcrypt' library which
 179           provides functions for one-way encryption.  Supported
 180           encryption algorithms include MD5, SHA-256, SHA-512 and DES.
 181
 182
 183 config EGLIBC_OPTION_EGLIBC_CRYPT_UFC
 184         bool "Ultra fast `crypt' implementation"
 185         default y
 186         depends EGLIBC_VERSION_2_12
 187         select EGLIBC_OPTION_EGLIBC_CRYPT
 188         help
 189           This option group provides ultra fast DES-based implementation of
 190           the `crypt' function.  When this option group is disabled,
 191           (a) the library will not provide the setkey[_r] and encrypt[_r]
 192           functions and (b) the crypt[_r] function will return NULL and set the
 193           errno to ENOSYS if /salt/ passed does not correspond to either MD5,
 194           SHA-256 or SHA-512 algorithm.
 195
 196
 197 config EGLIBC_OPTION_EGLIBC_DB_ALIASES
 198         bool "Functions for accessing the mail aliases database"
 199         default y
 200         help
 201           This option group includes functions for looking up mail
 202           aliases in '/etc/aliases' or using nsswitch.  It includes the
 203           following functions:
 204
 205                 endaliasent
 206                 getaliasbyname
 207                 getaliasbyname_r
 208                 getaliasent
 209                 getaliasent_r
 210                 setaliasent
 211
 212           When this option group is disabled, the NSS service libraries
 213           also lack support for querying their mail alias tables.
 214
 215
 216 config EGLIBC_OPTION_EGLIBC_ENVZ
 217         bool "Functions for handling envz-style environment vectors."
 218         default y
 219         help
 220           This option group contains functions for creating and operating
 221           on envz vectors.  An "envz vector" is a vector of strings in a
 222           contiguous block of memory, where each element is a name-value
 223           pair, and elements are separated from their neighbors by null
 224           characters.
 225
 226           This option group includes the following functions:
 227
 228                 envz_add        envz_merge
 229                 envz_entry      envz_remove
 230                 envz_get        envz_strip
 231
 232
 233 config EGLIBC_OPTION_EGLIBC_FCVT
 234         bool "Functions for converting floating-point numbers to strings"
 235         default y
 236         depends EGLIBC_VERSION_2_10 || EGLIBC_VERSION_2_11 ||  EGLIBC_VERSION_2_12
 237         help
 238           This option group includes functions for converting
 239           floating-point numbers to strings.
 240
 241           This option group includes the following functions:
 242
 243                 ecvt           qecvt
 244                 ecvt_r         qecvt_r
 245                 fcvt           qfcvt
 246                 fcvt_r         qfcvt_r
 247                 gcvt           qgcvt
 248
 249
 250 config EGLIBC_OPTION_EGLIBC_FMTMSG
 251         bool "Functions for formatting messages"
 252         default y
 253         depends EGLIBC_VERSION_2_10 || EGLIBC_VERSION_2_11 ||  EGLIBC_VERSION_2_12
 254         help
 255           This option group includes the following functions:
 256
 257                 addseverity    fmtmsg
 258
 259
 260 config EGLIBC_OPTION_EGLIBC_FSTAB
 261         bool "Access functions for 'fstab'"
 262         default y
 263         help
 264           This option group includes functions for reading the mount
 265           point specification table, '/etc/fstab'.  These functions are
 266           not included in the POSIX standard, which provides the
 267           'getmntent' family of functions instead.
 268
 269           This option group includes the following functions:
 270
 271                 endfsent       getfsspec
 272                 getfsent       setfsent
 273                 getfsfile
 274
 275
 276 config EGLIBC_OPTION_EGLIBC_FTRAVERSE
 277         bool "Functions for traversing file hierarchies"
 278         default y
 279         depends EGLIBC_VERSION_2_10 || EGLIBC_VERSION_2_11 ||  EGLIBC_VERSION_2_12
 280         help
 281           This option group includes functions for traversing file
 282           UNIX file hierachies.
 283
 284           This option group includes the following functions:
 285
 286                 fts_open       ftw
 287                 fts_read       nftw
 288                 fts_children   ftw64
 289                 fts_set        nftw64
 290                 fts_close
 291
 292
 293 config EGLIBC_OPTION_EGLIBC_GETLOGIN
 294         bool "The getlogin function"
 295         default y
 296         select EGLIBC_OPTION_EGLIBC_UTMP
 297         help
 298           This function group includes the 'getlogin' and 'getlogin_r'
 299           functions, which return the user name associated by the login
 300           activity with the current process's controlling terminal.
 301
 302           With this option group disabled, the 'glob' function will not
 303           fall back on 'getlogin' to find the user's login name for tilde
 304           expansion when the 'HOME' environment variable is not set.
 305
 306
 307 config EGLIBC_OPTION_EGLIBC_IDN
 308         bool "International domain names support"
 309         default y
 310         depends EGLIBC_VERSION_2_12
 311         help
 312           This option group includes the `libcidn' library which
 313           provides support for international domain names.
 314
 315
 316 config EGLIBC_OPTION_EGLIBC_INET
 317         bool "Networking support"
 318         default y
 319         help
 320           This option group includes networking-specific functions and
 321           data.  With EGLIBC_OPTION_EGLIBC_INET disabled, the EGLIBC
 322           installation and API changes as follows:
 323
 324           - The following libraries are not installed:
 325
 326                 libanl
 327                 libnsl
 328                 libnss_compat
 329                 libnss_dns
 330                 libnss_hesiod
 331                 libnss_nis
 332                 libnss_nisplus
 333                 libresolv
 334
 335           - The following functions and variables are omitted from libc:
 336
 337                 authdes_create           hstrerror              svc_fdset
 338                 authdes_getucred         htonl                  svc_getreq
 339                 authdes_pk_create        htons                  svc_getreq_common
 340                 authnone_create          if_freenameindex       svc_getreq_poll
 341                 authunix_create          if_indextoname         svc_getreqset
 342                 authunix_create_default  if_nameindex           svc_max_pollfd
 343                 bindresvport             if_nametoindex         svc_pollfd
 344                 callrpc                  in6addr_any            svcraw_create
 345                 cbc_crypt                in6addr_loopback       svc_register
 346                 clnt_broadcast           inet6_opt_append       svc_run
 347                 clnt_create              inet6_opt_find         svc_sendreply
 348                 clnt_pcreateerror        inet6_opt_finish       svctcp_create
 349                 clnt_perrno              inet6_opt_get_val      svcudp_bufcreate
 350                 clnt_perror              inet6_opt_init         svcudp_create
 351                 clntraw_create           inet6_option_alloc     svcudp_enablecache
 352                 clnt_spcreateerror       inet6_option_append    svcunix_create
 353                 clnt_sperrno             inet6_option_find      svcunixfd_create
 354                 clnt_sperror             inet6_option_init      svc_unregister
 355                 clnttcp_create           inet6_option_next      user2netname
 356                 clntudp_bufcreate        inet6_option_space     xdecrypt
 357                 clntudp_create           inet6_opt_next         xdr_accepted_reply
 358                 clntunix_create          inet6_opt_set_val      xdr_array
 359                 des_setparity            inet6_rth_add          xdr_authdes_cred
 360                 ecb_crypt                inet6_rth_getaddr      xdr_authdes_verf
 361                 endaliasent              inet6_rth_init         xdr_authunix_parms
 362                 endhostent               inet6_rth_reverse      xdr_bool
 363                 endnetent                inet6_rth_segments     xdr_bytes
 364                 endnetgrent              inet6_rth_space        xdr_callhdr
 365                 endprotoent              inet_addr              xdr_callmsg
 366                 endrpcent                inet_aton              xdr_char
 367                 endservent               inet_lnaof             xdr_cryptkeyarg
 368                 ether_aton               inet_makeaddr          xdr_cryptkeyarg2
 369                 ether_aton_r             inet_netof             xdr_cryptkeyres
 370                 ether_hostton            inet_network           xdr_des_block
 371                 ether_line               inet_nsap_addr         xdr_double
 372                 ether_ntoa               inet_nsap_ntoa         xdr_enum
 373                 ether_ntoa_r             inet_ntoa              xdr_float
 374                 ether_ntohost            inet_ntop              xdr_free
 375                 freeaddrinfo             inet_pton              xdr_getcredres
 376                 freeifaddrs              innetgr                xdr_hyper
 377                 gai_strerror             iruserok               xdr_int
 378                 getaddrinfo              iruserok_af            xdr_int16_t
 379                 getaliasbyname           key_decryptsession     xdr_int32_t
 380                 getaliasbyname_r         key_decryptsession_pk  xdr_int64_t
 381                 getaliasent              key_encryptsession     xdr_int8_t
 382                 getaliasent_r            key_encryptsession_pk  xdr_keybuf
 383                 gethostbyaddr            key_gendes             xdr_key_netstarg
 384                 gethostbyaddr_r          key_get_conv           xdr_key_netstres
 385                 gethostbyname            key_secretkey_is_set   xdr_keystatus
 386                 gethostbyname2           key_setnet             xdr_long
 387                 gethostbyname2_r         key_setsecret          xdr_longlong_t
 388                 gethostbyname_r          netname2host           xdrmem_create
 389                 gethostent               netname2user           xdr_netnamestr
 390                 gethostent_r             ntohl                  xdr_netobj
 391                 getifaddrs               ntohs                  xdr_opaque
 392                 getipv4sourcefilter      passwd2des             xdr_opaque_auth
 393                 get_myaddress            pmap_getmaps           xdr_pmap
 394                 getnameinfo              pmap_getport           xdr_pmaplist
 395                 getnetbyaddr             pmap_rmtcall           xdr_pointer
 396                 getnetbyaddr_r           pmap_set               xdr_quad_t
 397                 getnetbyname             pmap_unset             xdrrec_create
 398                 getnetbyname_r           rcmd                   xdrrec_endofrecord
 399                 getnetent                rcmd_af                xdrrec_eof
 400                 getnetent_r              registerrpc            xdrrec_skiprecord
 401                 getnetgrent              res_init               xdr_reference
 402                 getnetgrent_r            rexec                  xdr_rejected_reply
 403                 getnetname               rexec_af               xdr_replymsg
 404                 getprotobyname           rexecoptions           xdr_rmtcall_args
 405                 getprotobyname_r         rpc_createerr          xdr_rmtcallres
 406                 getprotobynumber         rresvport              xdr_short
 407                 getprotobynumber_r       rresvport_af           xdr_sizeof
 408                 getprotoent              rtime                  xdrstdio_create
 409                 getprotoent_r            ruserok                xdr_string
 410                 getpublickey             ruserok_af             xdr_u_char
 411                 getrpcbyname             ruserpass              xdr_u_hyper
 412                 getrpcbyname_r           setaliasent            xdr_u_int
 413                 getrpcbynumber           sethostent             xdr_uint16_t
 414                 getrpcbynumber_r         setipv4sourcefilter    xdr_uint32_t
 415                 getrpcent                setnetent              xdr_uint64_t
 416                 getrpcent_r              setnetgrent            xdr_uint8_t
 417                 getrpcport               setprotoent            xdr_u_long
 418                 getsecretkey             setrpcent              xdr_u_longlong_t
 419                 getservbyname            setservent             xdr_union
 420                 getservbyname_r          setsourcefilter        xdr_unixcred
 421                 getservbyport            svcauthdes_stats       xdr_u_quad_t
 422                 getservbyport_r          svcerr_auth            xdr_u_short
 423                 getservent               svcerr_decode          xdr_vector
 424                 getservent_r             svcerr_noproc          xdr_void
 425                 getsourcefilter          svcerr_noprog          xdr_wrapstring
 426                 h_errlist                svcerr_progvers        xencrypt
 427                 h_errno                  svcerr_systemerr       xprt_register
 428                 herror                   svcerr_weakauth        xprt_unregister
 429                 h_nerr                   svc_exit
 430                 host2netname             svcfd_create
 431
 432           - The rpcgen, nscd, and rpcinfo commands are not installed.
 433
 434           - The 'rpc' file (a text file listing RPC services) is not installed.
 435
 436           Socket-related system calls do not fall in this option group,
 437           because many are also used for other inter-process
 438           communication mechanisms.  For example, the 'syslog' routines
 439           use Unix-domain sockets to communicate with the syslog daemon;
 440           syslog is valuable in non-networked contexts.
 441
 442
 443 config EGLIBC_OPTION_EGLIBC_INET_ANL
 444         bool "Asynchronous name lookup"
 445         default y
 446         depends EGLIBC_VERSION_2_12
 447         select EGLIBC_OPTION_EGLIBC_INET
 448         help
 449           This option group includes the `libanl' library which
 450           provides support for asynchronous name lookup.
 451
 452
 453 config EGLIBC_OPTION_EGLIBC_LIBM
 454         bool "libm (math library)"
 455         default y
 456         help
 457           This option group includes the 'libm' library, containing
 458           mathematical functions.  If this option group is omitted, then
 459           an EGLIBC installation does not include shared or unshared versions
 460           of the math library.
 461
 462           Note that this does not remove all floating-point related
 463           functionality from EGLIBC; for example, 'printf' and 'scanf'
 464           can still print and read floating-point values with this option
 465           group disabled.
 466
 467           Note that the ISO Standard C++ library 'libstdc++' depends on
 468           EGLIBC's math library 'libm'.  If you disable this option
 469           group, you will not be able to build 'libstdc++' against the
 470           resulting EGLIBC installation.
 471
 472
 473 config EGLIBC_OPTION_EGLIBC_LIBM_BIG
 474         bool "Math library size"
 475         default y
 476         depends EGLIBC_VERSION_2_12
 477         help
 478           This option group enables default configuration of the math library.
 479           Not selecting this option group removes most of the extended and
 480           double precision math functions and replaces them with wrappers
 481           to the single precision couterparts.
 482           Doing so greatly degrades quality of calculations carried
 483           out by the functions of the math library, but also significantly
 484           reduces the size of the libm.
 485           This option group is useful for systems that do not rely on precise
 486           floating point math.
 487
 488
 489 config EGLIBC_OPTION_EGLIBC_LOCALES
 490         bool "Locale definitions"
 491         default y
 492         help
 493           This option group includes all locale definitions other than
 494           that for the "C" locale.  If this option group is omitted, then
 495           only the "C" locale is supported.
 496
 497
 498 config EGLIBC_OPTION_EGLIBC_LOCALE_CODE
 499         bool "Locale functions"
 500         default y
 501         select EGLIBC_OPTION_POSIX_C_LANG_WIDE_CHAR if EGLIBC_VERSION_2_8 || EGLIBC_VERSION_2_9 || EGLIBC_VERSION_2_10 || EGLIBC_VERSION_2_11 ||  EGLIBC_VERSION_2_12
 502         help
 503           This option group includes locale support functions, programs,
 504           and libraries.  With EGLIBC_OPTION_EGLIBC_LOCALE_CODE disabled,
 505           EGLIBC supports only the 'C' locale (also known as 'POSIX'),
 506           and ignores the settings of the 'LANG' and 'LC_*' environment
 507           variables.
 508
 509           With EGLIBC_OPTION_EGLIBC_LOCALE_CODE disabled, the following
 510           functions are omitted from libc:
 511
 512                 duplocale   localeconv  nl_langinfo    rpmatch  strfmon_l
 513                 freelocale  newlocale   nl_langinfo_l  strfmon  uselocale
 514
 515           Furthermore, only the LC_CTYPE and LC_TIME categories of the
 516           standard "C" locale are available.
 517
 518           The EGLIBC_OPTION_EGLIBC_CATGETS option group depends on this option
 519           group; if you disable EGLIBC_OPTION_EGLIBC_LOCALE_CODE, you must also
 520           disable EGLIBC_OPTION_EGLIBC_CATGETS.
 521
 522
 523 config EGLIBC_OPTION_EGLIBC_MEMUSAGE
 524         bool "Memory profiling library"
 525         default y
 526         depends EGLIBC_VERSION_2_11 ||  EGLIBC_VERSION_2_12
 527         help
 528           This option group includes the `libmemusage' library and
 529           the `memusage' and `memusagestat' utilities.
 530           These components provide memory profiling functions.
 531
 532           EGLIBC_OPTION_EGLIBC_MEMUSAGE_DEFAULT_BUFFER_SIZE
 533
 534           Libmemusage library buffers the profiling data in memory
 535           before writing it out to disk.  By default, the library
 536           allocates 1.5M buffer, which can be substantial for some
 537           systems.  EGLIBC_OPTION_EGLIBC_MEMUSAGE_DEFAULT_BUFFER_SIZE option
 538           allows to change the default buffer size.  It specifies
 539           the number of entries the buffer should have.
 540           On most architectures one buffer entry amounts to 48 bytes,
 541           so setting this option to the value of 512 will reduce the size of
 542           the memory buffer to 24K.
 543
 544
 545 config EGLIBC_OPTION_EGLIBC_NIS
 546         bool "Support for NIS, NIS+, and the special 'compat' services."
 547         default y
 548         select EGLIBC_OPTION_EGLIBC_INET
 549         select EGLIBC_OPTION_EGLIBC_SUNRPC
 550         help
 551           This option group includes the NIS, NIS+, and 'compat' Name
 552           Service Switch service libraries.  When it is disabled, those
 553           services libraries are not installed; you should remove any
 554           references to them from your 'nsswitch.conf' file.
 555
 556           This option group depends on the EGLIBC_OPTION_EGLIBC_INET option
 557           group; you must enable that to enable this option group.
 558
 559
 560 config EGLIBC_OPTION_EGLIBC_NSSWITCH
 561         bool "Name service switch (nsswitch) support"
 562         default y
 563         select EGLIBC_OPTION_EGLIBC_INET
 564         help
 565
 566           This option group includes support for the 'nsswitch' facility.
 567           With this option group enabled, all EGLIBC functions for
 568           accessing various system databases (passwords and groups;
 569           networking; aliases; public keys; and so on) consult the
 570           '/etc/nsswitch.conf' configuration file to decide how to handle
 571           queries.
 572
 573           With this option group disabled, EGLIBC uses a fixed list of
 574           services to satisfy queries on each database, as requested by
 575           configuration files specified when EGLIBC is built.  Your
 576           'option-groups.config' file must set the following two
 577           variables:
 578
 579           EGLIBC_OPTION_EGLIBC_NSSWITCH_FIXED_CONFIG
 580
 581                 Set this to the name of a file whose contents observe the
 582                 same syntax as an ordinary '/etc/nsswitch.conf' file.  The
 583                 EGLIBC build process parses this file just as EGLIBC would
 584                 at run time if EGLIBC_NSSWITCH were enabled, and
 585                 produces a C library that uses the nsswitch service
 586                 libraries to search for database entries as this file
 587                 specifies, instead of consulting '/etc/nsswitch.conf' at run
 588                 time.
 589
 590                 This should be an absolute filename.  The EGLIBC build
 591                 process may use it from several different working
 592                 directories.  It may include references to Makefile
 593                 variables like 'common-objpfx' (the top of the build tree,
 594                 with a trailing slash), or '..' (the top of the source tree,
 595                 with a trailing slash).
 596
 597                 The EGLIBC source tree includes a sample configuration file
 598                 named 'nss/fixed-nsswitch.conf'; for simple configurations,
 599                 you will probably want to delete references to databases not
 600                 needed on your system.
 601
 602           EGLIBC_OPTION_EGLIBC_NSSWITCH_FIXED_FUNCTIONS
 603
 604                 The EGLIBC build process uses this file to decide which
 605                 functions to make available from which service libraries.
 606                 The file 'nss/fixed-nsswitch.functions' serves as a sample
 607                 configuration file for this setting, and explains its syntax
 608                 and meaning in more detail.
 609
 610                 This should be an absolute file name.  The EGLIBC build
 611                 process may use it from several different working
 612                 directories.  It may include references to Makefile
 613                 variables like 'common-objpfx' (the top of the build tree,
 614                 with a trailing slash), or '..' (the top of the source tree,
 615                 with a trailing slash).
 616
 617                 Be sure to mention each function in each service you wish to
 618                 use.  If you do not mention a service's function here, the
 619                 EGLIBC database access functions will not find it, even if
 620                 it is listed in the EGLIBC_OPTION_EGLIBC_NSSWITCH_FIXED_CONFIG
 621                 file.
 622
 623           In this arrangement, EGLIBC will not use the 'dlopen' and
 624           'dlsym' functions to find database access functions.  Instead,
 625           libc hard-codes references to the service libraries' database
 626           access functions.  You must explicitly link your program
 627           against the name service libraries (those whose names start
 628           with 'libnss_', in the sysroot's '/lib' directory) whose
 629           functions you intend to use.  This arrangement helps
 630           system-wide static analysis tools decide which functions a
 631           system actually uses.
 632
 633           Note that some nsswitch service libraries require other option
 634           groups to be enabled; for example, the EGLIBC_OPTION_EGLIBC_INET
 635           option group must be enabled to use the 'libnss_dns.so.2'
 636           service library, which uses the Domain Name System network
 637           protocol to answer queries.
 638
 639
 640 config EGLIBC_OPTION_EGLIBC_RCMD
 641         bool "Support for 'rcmd' and related library functions"
 642         default y
 643         select EGLIBC_OPTION_EGLIBC_INET
 644         help
 645           This option group includes functions for running commands on
 646           remote machines via the 'rsh' protocol, and doing authentication
 647           related to those functions.  This also includes functions that
 648           use the 'rexec' protocol.
 649
 650           This option group includes the following functions:
 651
 652                 rcmd            ruserok
 653                 rcmd_af         ruserok_af
 654                 rexec           iruserok
 655                 rexec_af        iruserok_af
 656                 rresvport       ruserpass
 657                 rresvport_af
 658
 659
 660 config EGLIBC_OPTION_EGLIBC_RTLD_DEBUG
 661         bool "Runtime linker debug print outs"
 662         default y
 663         depends EGLIBC_VERSION_2_12
 664         help
 665           This option group enables debug output of the runtime linker
 666           which is activated via LD_DEBUG and LD_TRACE_PRELINKING
 667           environment variables.  Disabling this option group yields
 668           a smaller runtime linker binary.
 669           BEWARE: Disabling this option group is likely to break
 670           the `ldd' utility which may also be used by the prelinker.
 671           In particular, the `--unused' ldd option will not work correctly.
 672
 673
 674 config EGLIBC_OPTION_EGLIBC_SPAWN
 675         bool "Support for POSIX posix_spawn functions"
 676         default y
 677         help
 678           This option group includes the POSIX functions for executing
 679           programs in child processes without using 'fork' or 'vfork'.
 680
 681           This option group includes the following functions:
 682
 683                 posix_spawn
 684                 posix_spawnattr_destroy
 685                 posix_spawnattr_getflags
 686                 posix_spawnattr_getpgroup
 687                 posix_spawnattr_getschedparam
 688                 posix_spawnattr_getschedpolicy
 689                 posix_spawnattr_getsigdefault
 690                 posix_spawnattr_getsigmask
 691                 posix_spawnattr_init
 692                 posix_spawnattr_setflags
 693                 posix_spawnattr_setpgroup
 694                 posix_spawnattr_setschedparam
 695                 posix_spawnattr_setschedpolicy
 696                 posix_spawnattr_setsigdefault
 697                 posix_spawnattr_setsigmask
 698                 posix_spawn_file_actions_addclose
 699                 posix_spawn_file_actions_adddup2
 700                 posix_spawn_file_actions_addopen
 701                 posix_spawn_file_actions_destroy
 702                 posix_spawn_file_actions_init
 703                 posix_spawnp
 704
 705           This option group also provides the ability for the iconv,
 706           localedef, and locale programs to operate transparently on
 707           compressed charset definitions.  When this option group is
 708           disabled, those programs will only operate on uncompressed
 709           charmap files.
 710
 711
 712 config EGLIBC_OPTION_EGLIBC_STREAMS
 713         bool "Support for accessing STREAMS."
 714         default y
 715         help
 716           This option group includes functions for reading and writing
 717           messages to and from STREAMS.  The STREAMS interface provides a
 718           uniform mechanism for implementing networking services and other
 719           character-based I/O.  (STREAMS are not to be confused with
 720           <stdio.h> FILE objects, also called 'streams'.)
 721
 722           This option group includes the following functions:
 723
 724                 getmsg          putpmsg
 725                 getpmsg         fattach
 726                 isastream       fdetach
 727                 putmsg
 728
 729
 730 config EGLIBC_OPTION_EGLIBC_SUNRPC
 731         bool "Support for the Sun 'RPC' protocol."
 732         default y
 733         select EGLIBC_OPTION_EGLIBC_INET
 734         help
 735           This option group includes support for the Sun RPC protocols,
 736           including the 'rpcgen' and 'rpcinfo' programs.
 737
 738
 739 config EGLIBC_OPTION_EGLIBC_UTMP
 740         bool "Older access functions for 'utmp' login records"
 741         default y
 742         help
 743           This option group includes the older 'utent' family of
 744           functions for accessing user login records in the 'utmp' file.
 745           POSIX omits these functions in favor of the 'utxent' family,
 746           and they are obsolete on systems other than Linux.
 747
 748           This option group includes the following functions:
 749
 750                 endutent
 751                 getutent
 752                 getutent_r
 753                 getutid
 754                 getutid_r
 755                 getutline
 756                 getutline_r
 757                 logwtmp
 758                 pututline
 759                 setutent
 760                 updwtmp
 761                 utmpname
 762
 763           This option group includes the following libraries:
 764
 765                 libutil.so (and libutil.a)
 766
 767
 768 config EGLIBC_OPTION_EGLIBC_UTMPX
 769         bool "POSIX access functions for 'utmp' login records"
 770         default y
 771         select EGLIBC_OPTION_EGLIBC_UTMP
 772         help
 773           This option group includes the POSIX functions for reading and
 774           writing user login records in the 'utmp' file (usually
 775           '/var/run/utmp').  The POSIX functions operate on 'struct
 776           utmpx' structures, as opposed to the family of older 'utent'
 777           functions, which operate on 'struct utmp' structures.
 778
 779           This option group includes the following functions:
 780
 781                 endutxent
 782                 getutmp
 783                 getutmpx
 784                 getutxent
 785                 getutxid
 786                 getutxline
 787                 pututxline
 788                 setutxent
 789                 updwtmpx
 790                 utmpxname
 791
 792
 793 config EGLIBC_OPTION_EGLIBC_WORDEXP
 794         bool "Shell-style word expansion"
 795         default y
 796         help
 797           This option group includes the 'wordexp' function for
 798           performing word expansion in the manner of the shell, and the
 799           accompanying 'wordfree' function.
 800
 801
 802 config EGLIBC_OPTION_POSIX_C_LANG_WIDE_CHAR
 803         bool "ISO C library wide character functions, excluding I/O"
 804         default y
 805         depends EGLIBC_VERSION_2_8 || EGLIBC_VERSION_2_9 || EGLIBC_VERSION_2_10 || EGLIBC_VERSION_2_11 ||  EGLIBC_VERSION_2_12
 806         help
 807           This option group includes the functions defined by the ISO C
 808           standard for working with wide and multibyte characters in
 809           memory.  Functions for reading and writing wide and multibyte
 810           characters from and to files call in the
 811           EGLIBC_OPTION_POSIX_WIDE_CHAR_DEVICE_IO option group.
 812
 813           This option group includes the following functions:
 814
 815                 btowc         mbsinit       wcscspn       wcstoll
 816                 iswalnum      mbsrtowcs     wcsftime      wcstombs
 817                 iswalpha      mbstowcs      wcslen        wcstoul
 818                 iswblank      mbtowc        wcsncat       wcstoull
 819                 iswcntrl      swprintf      wcsncmp       wcstoumax
 820                 iswctype      swscanf       wcsncpy       wcsxfrm
 821                 iswdigit      towctrans     wcspbrk       wctob
 822                 iswgraph      towlower      wcsrchr       wctomb
 823                 iswlower      towupper      wcsrtombs     wctrans
 824                 iswprint      vswprintf     wcsspn        wctype
 825                 iswpunct      vswscanf      wcsstr        wmemchr
 826                 iswspace      wcrtomb       wcstod        wmemcmp
 827                 iswupper      wcscat        wcstof        wmemcpy
 828                 iswxdigit     wcschr        wcstoimax     wmemmove
 829                 mblen         wcscmp        wcstok        wmemset
 830                 mbrlen        wcscoll       wcstol
 831                 mbrtowc       wcscpy        wcstold
 832
 833
 834 config EGLIBC_OPTION_POSIX_REGEXP
 835         bool "Regular expressions"
 836         default y
 837         help
 838           This option group includes the POSIX regular expression
 839           functions, and the associated non-POSIX extensions and
 840           compatibility functions.
 841
 842           With EGLIBC_OPTION_POSIX_REGEXP disabled, the following functions are
 843           omitted from libc:
 844
 845                 re_comp                 re_max_failures         regcomp
 846                 re_compile_fastmap      re_search               regerror
 847                 re_compile_pattern      re_search_2             regexec
 848                 re_exec                 re_set_registers        regfree
 849                 re_match                re_set_syntax           rpmatch
 850                 re_match_2              re_syntax_options
 851
 852           Furthermore, the compatibility regexp interface defined in the
 853           <regexp.h> header file, 'compile', 'step', and 'advance', is
 854           omitted.
 855
 856
 857 config EGLIBC_OPTION_POSIX_REGEXP_GLIBC
 858         bool "Regular expressions from GLIBC"
 859         default y
 860         depends EGLIBC_VERSION_2_10 || EGLIBC_VERSION_2_11 ||  EGLIBC_VERSION_2_12
 861         select EGLIBC_OPTION_POSIX_REGEXP
 862         help
 863           This option group specifies which regular expression
 864           library to use.  The choice is between regex
 865           implementation from GLIBC and regex implementation from
 866           libiberty.  The GLIBC variant is fully POSIX conformant and
 867           optimized for speed; regex from libiberty is more than twice
 868           as small while still is enough for most practical purposes.
 869
 870
 871 config EGLIBC_OPTION_POSIX_WIDE_CHAR_DEVICE_IO
 872         bool "Input and output functions for wide characters"
 873         default y
 874         select EGLIBC_OPTION_POSIX_C_LANG_WIDE_CHAR if EGLIBC_VERSION_2_8 || EGLIBC_VERSION_2_9 || EGLIBC_VERSION_2_10 || EGLIBC_VERSION_2_11 ||  EGLIBC_VERSION_2_12
 875         help
 876           This option group includes functions for reading and writing
 877           wide characters to and from <stdio.h> streams.
 878
 879           This option group includes the following functions:
 880
 881                 fgetwc        fwprintf      putwchar      vwscanf
 882                 fgetws        fwscanf       ungetwc       wprintf
 883                 fputwc        getwc         vfwprintf     wscanf
 884                 fputws        getwchar      vfwscanf
 885                 fwide         putwc         vwprintf
 886
 887           This option group further includes the following unlocked
 888           variants of the above functions:
 889
 890                 fgetwc_unlocked           getwc_unlocked
 891                 fgetws_unlocked           getwchar_unlocked
 892                 fputwc_unlocked           putwc_unlocked
 893                 fputws_unlocked           putwchar_unlocked
 894
 895           Note that the GNU standard C++ library, 'libstdc++.so', uses
 896           some of these functions; you will not be able to link or run
 897           C++ programs if you disable this option group.
 898
 899           This option group also affects the behavior of the following
 900           functions:
 901
 902                 fdopen
 903                 fopen
 904                 fopen64
 905                 freopen
 906                 freopen64
 907
 908           These functions all take an OPENTYPE parameter which may
 909           contain a string of the form ",ccs=CHARSET", indicating that
 910           the underlying file uses the character set named CHARSET.
 911           This produces a wide-oriented stream, which is only useful
 912           when the functions included in this option group are present.
 913           If the user attempts to open a file specifying a character set
 914           in the OPENTYPE parameter, and EGLIBC was built with this
 915           option group disabled, the function returns NULL, and sets
 916           errno to EINVAL.