configure.in

   1 dnl Process this file with autoconf to produce a configure script.
   2 AC_REVISION([$CVSid$])
   3 AC_PREREQ(2.53)dnl              dnl Minimum Autoconf version required.
   4 AC_INIT([GNU C Library], [(see version.h)], [glibc])
   5 AC_CONFIG_SRCDIR([include/features.h])
   6 AC_CONFIG_HEADERS([config.h])
   7 AC_CONFIG_AUX_DIR([scripts])
   8
   9 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
  10   AC_MSG_ERROR([you must configure in a separate build directory])
  11 fi
  12
  13 # This will get text that should go into config.make.
  14 config_vars=
  15
  16 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
  17 AC_ARG_WITH([gd],
  18             AC_HELP_STRING([--with-gd=DIR],
  19                            [find libgd include dir and library with prefix DIR]),
  20             [dnl
  21 case "$with_gd" in
  22 yes|''|no) ;;
  23 *) libgd_include="-I$withval/include"
  24    libgd_ldflags="-L$withval/lib" ;;
  25 esac
  26 ])
  27 AC_ARG_WITH([gd-include],
  28             AC_HELP_STRING([--with-gd-include=DIR],
  29                            [find libgd include files in DIR]),
  30             [dnl
  31 case "$with_gd_include" in
  32 ''|no) ;;
  33 *) libgd_include="-I$withval" ;;
  34 esac
  35 ])
  36 AC_ARG_WITH([gd-lib],
  37             AC_HELP_STRING([--with-gd-lib=DIR],
  38                            [find libgd library files in DIR]),
  39             [dnl
  40 case "$with_gd_lib" in
  41 ''|no) ;;
  42 *) libgd_ldflags="-L$withval" ;;
  43 esac
  44 ])
  45
  46 if test -n "$libgd_include"; then
  47   config_vars="$config_vars
  48 CFLAGS-memusagestat.c = $libgd_include"
  49 fi
  50 if test -n "$libgd_ldflags"; then
  51   config_vars="$config_vars
  52 libgd-LDFLAGS = $libgd_ldflags"
  53 fi
  54
  55 dnl Arguments to specify presence of other packages/features.
  56 AC_ARG_WITH([fp],
  57             AC_HELP_STRING([--with-fp],
  58                            [if using floating-point hardware @<:@default=yes@:>@]),
  59             [with_fp=$withval],
  60             [with_fp=yes])
  61 AC_SUBST(with_fp)
  62 AC_ARG_WITH([binutils],
  63             AC_HELP_STRING([--with-binutils=PATH],
  64                            [specify location of binutils (as and ld)]),
  65             [path_binutils=$withval],
  66             [path_binutils=''])
  67 AC_ARG_WITH([elf],
  68             AC_HELP_STRING([--with-elf],
  69                            [if using the ELF object format]),
  70             [elf=$withval],
  71             [elf=no])
  72 AC_ARG_WITH([selinux],
  73             AC_HELP_STRING([--with-selinux],
  74                            [if building with SELinux support]),
  75             [with_selinux=$withval],
  76             [with_selinux=auto])
  77 AC_ARG_WITH([xcoff],
  78             AC_HELP_STRING([--with-xcoff],
  79                            [if using the XCOFF object format]),
  80             [xcoff=$withval],
  81             [xcoff=no])
  82 AC_ARG_WITH([cvs],
  83             AC_HELP_STRING([--without-cvs],
  84                            [if CVS should not be used]),
  85             [with_cvs=$withval],
  86             [with_cvs=yes])
  87 if test "$with_cvs" = yes; then
  88   if test -d $srcdir/CVS && grep :pserver: $srcdir/CVS/Root > /dev/null
  89   then
  90     with_cvs=no
  91   fi
  92 fi
  93 AC_SUBST(with_cvs)
  94
  95 AC_ARG_WITH([headers],
  96             AC_HELP_STRING([--with-headers=PATH],
  97                            [location of system headers to use
  98                             (for example /usr/src/linux/include)
  99                             @<:@default=compiler default@:>@]),
 100             [sysheaders=$withval],
 101             [sysheaders=''])
 102
 103 AC_ARG_ENABLE([sanity-checks],
 104               AC_HELP_STRING([--disable-sanity-checks],
 105                              [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
 106               [enable_sanity=$enableval],
 107               [enable_sanity=yes])
 108
 109 AC_SUBST(enable_check_abi)
 110 AC_ARG_ENABLE([check-abi],
 111               AC_HELP_STRING([--enable-check-abi],
 112                              [do "make check-abi" in "make check" (no/warn/yes)
 113                               @<:@default=no@:>@]),
 114               [enable_check_abi=$enableval],
 115               [enable_check_abi=no])
 116
 117 dnl Arguments to enable or disable building the static, shared, profiled,
 118 dnl and -fomit-frame-pointer libraries.
 119 dnl I've disabled this for now since we cannot build glibc without static
 120 dnl libraries built in the moment.
 121 dnl AC_ARG_ENABLE([static],
 122 dnl               AC_HELP_STRING([--enable-static],
 123 dnl                              [build static library @<:@default=yes@:>@]),
 124 dnl               [static=$enableval],
 125 dnl               [static=yes])
 126 static=yes
 127 AC_ARG_ENABLE([shared],
 128               AC_HELP_STRING([--enable-shared],
 129                              [build shared library @<:@default=yes if GNU ld & ELF@:>@]),
 130               [shared=$enableval],
 131               [shared=default])
 132 AC_ARG_ENABLE([profile],
 133               AC_HELP_STRING([--enable-profile],
 134                              [build profiled library @<:@default=yes@:>@]),
 135               [profile=$enableval],
 136               [profile=yes])
 137 AC_ARG_ENABLE([omitfp],
 138               AC_HELP_STRING([--enable-omitfp],
 139                              [build undebuggable optimized library @<:@default=no@:>@]),
 140               [omitfp=$enableval],
 141               [omitfp=no])
 142 AC_ARG_ENABLE([bounded],
 143               AC_HELP_STRING([--enable-bounded],
 144                              [build with runtime bounds checking @<:@default=no@:>@]),
 145               [bounded=$enableval],
 146               [bounded=no])
 147 AC_ARG_ENABLE([versioning],
 148               AC_HELP_STRING([--disable-versioning],
 149                              [do not include versioning information in the library objects @<:@default=yes if supported@:>@]),
 150               [enable_versioning=$enableval],
 151               [enable_versioning=yes])
 152
 153 AC_ARG_ENABLE([oldest-abi],
 154               AC_HELP_STRING([--enable-oldest-abi=ABI],
 155                              [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
 156               [oldest_abi=$enableval],
 157               [oldest_abi=no])
 158 if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
 159   oldest_abi=default
 160 else
 161   AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
 162 fi
 163 AC_SUBST(oldest_abi)
 164
 165 AC_ARG_ENABLE([stackguard-randomization],
 166               AC_HELP_STRING([--enable-stackguard-randomization],
 167                              [initialize __stack_chk_guard canary with a random number at program start]),
 168               [enable_stackguard_randomize=$enableval],
 169               [enable_stackguard_randomize=no])
 170 if test "$enable_stackguard_randomize" = yes; then
 171   AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
 172 fi
 173
 174 dnl Generic infrastructure for drop-in additions to libc.
 175 AC_ARG_ENABLE([add-ons],
 176               AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
 177                              [configure and build add-ons in DIR1,DIR2,...
 178                               search for add-ons if no parameter given]),
 179                              , [enable_add_ons=yes])
 180
 181 dnl Let the user avoid using TLS.  Don't know why but...
 182 AC_ARG_WITH([tls],
 183             AC_HELP_STRING([--with-tls],
 184                            [enable support for TLS]),
 185             [usetls=$withval],
 186             [usetls=yes])
 187
 188 AC_ARG_WITH([__thread],
 189             AC_HELP_STRING([--without-__thread],
 190                            [do not use TLS features even when supporting them]),
 191             [use__thread=$withval],
 192             [use__thread=yes])
 193
 194 AC_ARG_ENABLE([hidden-plt],
 195               AC_HELP_STRING([--disable-hidden-plt],
 196                              [do not hide internal function calls to avoid PLT]),
 197               [hidden=$enableval],
 198               [hidden=yes])
 199 if test "x$hidden" = xno; then
 200   AC_DEFINE(NO_HIDDEN)
 201 fi
 202
 203 AC_ARG_ENABLE([bind-now],
 204               AC_HELP_STRING([--enable-bind-now],
 205                              [disable lazy relocations in DSOs]),
 206               [bindnow=$enableval],
 207               [bindnow=no])
 208 AC_SUBST(bindnow)
 209
 210 dnl On some platforms we cannot use dynamic loading.  We must provide
 211 dnl static NSS modules.
 212 AC_ARG_ENABLE([static-nss],
 213               AC_HELP_STRING([--enable-static-nss],
 214                              [build static NSS modules @<:@default=no@:>@]),
 215               [static_nss=$enableval],
 216               [static_nss=no])
 217 dnl Enable static NSS also if we build no shared objects.
 218 if test x"$static_nss" = xyes || test x"$shared" = xno; then
 219   static_nss=yes
 220   AC_DEFINE(DO_STATIC_NSS)
 221 fi
 222
 223 AC_ARG_ENABLE([force-install],
 224               AC_HELP_STRING([--disable-force-install],
 225                              [don't force installation of files from this package, even if they are older than the installed files]),
 226               [force_install=$enableval],
 227               [force_install=yes])
 228 AC_SUBST(force_install)
 229
 230 dnl On some platforms we allow dropping compatibility with all kernel
 231 dnl versions.
 232 AC_ARG_ENABLE([kernel],
 233               AC_HELP_STRING([--enable-kernel=VERSION],
 234                              [compile for compatibility with kernel not older than VERSION]),
 235               [minimum_kernel=$enableval],
 236               [])
 237 dnl Prevent unreasonable values.
 238 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
 239   # Better nothing than this.
 240   minimum_kernel=""
 241 else
 242   if test "$minimum_kernel" = current; then
 243     minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
 244   fi
 245 fi
 246
 247 dnl For the development we sometimes want gcc to issue even more warnings.
 248 dnl This is not the default since many of the extra warnings are not
 249 dnl appropriate.
 250 AC_ARG_ENABLE([all-warnings],
 251               AC_HELP_STRING([--enable-all-warnings],
 252                              [enable all useful warnings gcc can issue]),
 253               [all_warnings=$enableval],
 254               [])
 255 AC_SUBST(all_warnings)
 256
 257 AC_CANONICAL_HOST
 258
 259 # The way shlib-versions is used to generate soversions.mk uses a
 260 # fairly simplistic model for name recognition that can't distinguish
 261 # i486-pc-linux-gnu fully from i486-pc-gnu.  So we mutate a $host_os
 262 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
 263 # tell.  This doesn't get used much beyond that, so it's fairly safe.
 264 case "$host_os" in
 265 linux*)
 266   ;;
 267 gnu*)
 268   host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
 269   ;;
 270 esac
 271
 272 # We keep the original values in `$config_*' and never modify them, so we
 273 # can write them unchanged into config.make.  Everything else uses
 274 # $machine, $vendor, and $os, and changes them whenever convenient.
 275 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
 276
 277 # Don't allow vendor == "unknown"
 278 test "$config_vendor" = unknown && config_vendor=
 279 config_os="`echo $config_os | sed 's/^unknown-//'`"
 280
 281 # Some configurations imply other options.
 282 case "$host_os" in
 283 # i586-linuxaout is mangled into i586-pc-linux-gnuaout
 284 linux*ecoff* | linux*aout* | gnu*aout* | gnu*ecoff*)
 285   ;;
 286 gnu* | linux* | freebsd* | netbsd* | sysv4* | solaris2* | irix6*)
 287   # These systems (almost) always use the ELF format.
 288   elf=yes
 289   ;;
 290 aix*)
 291   # These systems are always xcoff
 292   xcoff=yes
 293   elf=no
 294   ;;
 295 esac
 296
 297 # The configure fragment of an add-on port can modify these to supplement
 298 # or override the table in the case statement below.  No fragment should
 299 # ever change the config_* variables, however.
 300 machine=$config_machine
 301 vendor=$config_vendor
 302 os=$config_os
 303
 304 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
 305 # Unify this here.
 306 if test "$machine" = rs6000; then
 307   machine="powerpc"
 308 fi
 309
 310 # Braindead PowerPC box with absolutely no FPU.
 311 case "$machine-$host_os" in
 312   powerpc*-*soft)
 313     with_fp=no
 314     ;;
 315 esac
 316
 317 submachine=
 318 AC_ARG_WITH([cpu],
 319             AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
 320             [dnl
 321   case "$withval" in
 322   yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
 323   no) ;;
 324   *) submachine="$withval" ;;
 325   esac
 326 ])
 327
 328
 329 # An add-on can set this when it wants to disable the sanity check below.
 330 libc_config_ok=no
 331
 332 dnl Having this here, though empty, makes sure that if add-ons' fragments
 333 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
 334 dnl our AC_OUTPUT will actually use it.
 335 AC_CONFIG_SUBDIRS()
 336
 337 case "$enable_add_ons" in
 338 ''|no) add_ons= ;;
 339 yes|'*')
 340  add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
 341           sed 's@/[[^/]]*$@@' | sort | uniq`
 342          add_ons_automatic=yes
 343          ;;
 344 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
 345        add_ons_automatic=no ;;
 346 esac
 347
 348 configured_add_ons=
 349 add_ons_sfx=
 350 add_ons_pfx=
 351 if test x"$add_ons" != x; then
 352   for f in $add_ons; do
 353     # Some sanity checks
 354     case "$f" in
 355     crypt)
 356       AC_MSG_ERROR([
 357 *** It seems that you're using an old \`crypt' add-on.  crypt is now
 358 *** part of glibc and using the old add-on will not work with this
 359 *** release.  Start again with fresh sources and without the old
 360 *** \`crypt' add-on.])
 361     ;;
 362     localedata)
 363       AC_MSG_ERROR([
 364 *** It seems that you're using an old \`localedata' add-on.  localedata
 365 *** is now part of glibc and using the old add-on will not work with
 366 *** this release.  Start again with fresh sources and without the old
 367 *** \`localedata' add-on.])
 368     ;;
 369     esac
 370   done
 371
 372   # Now source each add-on's configure fragment.
 373   # The fragments can use $srcdir/$libc_add_on to find themselves,
 374   # and test $add_ons_automatic to see if they were explicitly requested.
 375   # A fragment can clear (or even change) $libc_add_on to affect
 376   # whether it goes into the list to be actually used in the build.
 377   use_add_ons=
 378   for libc_add_on in $add_ons; do
 379     # Test whether such a directory really exists.
 380     # It can be absolute, or relative to $srcdir, or relative to the build dir.
 381     case "$libc_add_on" in
 382     /*)
 383       libc_add_on_srcdir=$libc_add_on
 384       ;;
 385     *)
 386       test -d "$srcdir/$libc_add_on" || {
 387         if test -d "$libc_add_on"; then
 388           libc_add_on="`pwd`/$libc_add_on"
 389         else
 390           AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
 391         fi
 392       }
 393       libc_add_on_srcdir=$srcdir/$libc_add_on
 394       ;;
 395     esac
 396
 397     libc_add_on_frag=$libc_add_on_srcdir/configure
 398     libc_add_on_canonical=
 399     if test -r "$libc_add_on_frag"; then
 400       AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
 401       libc_add_on_canonical=unknown
 402       libc_add_on_subdirs=
 403       . "$libc_add_on_frag"
 404       test -z "$libc_add_on" || {
 405         configured_add_ons="$configured_add_ons $libc_add_on"
 406         if test "x$libc_add_on_canonical" = xunknown; then
 407           AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
 408         fi
 409         for d in $libc_add_on_subdirs; do
 410           case "$libc_add_on" in
 411           /*) subdir_srcdir="$libc_add_on" ;;
 412           *) subdir_srcdir="\$(..)$libc_add_on" ;;
 413           esac
 414           case "$d" in
 415           .)
 416             d="${libc_add_on_canonical:-$libc_add_on}"
 417             ;;
 418           /*)
 419             subdir_srcdir="$d"
 420             ;;
 421           *)
 422             subdir_srcdir="$subdir_srcdir/$d"
 423             ;;
 424           esac
 425           d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
 426           add_on_subdirs="$add_on_subdirs $d"
 427           test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
 428 $d-srcdir = $subdir_srcdir"
 429         done
 430       }
 431     fi
 432     if test -n "$libc_add_on"; then
 433       if frags=`ls -d $libc_add_on_srcdir/sysdeps/*/preconfigure 2> /dev/null`
 434       then
 435         AC_MSG_CHECKING(add-on $libc_add_on for preconfigure fragments)
 436         for frag in $frags; do
 437           name=`echo "$frag" | sed 's@/[[^/]]*$@@;s@^.*/@@'`
 438           echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
 439           . "$frag"
 440         done
 441         AC_MSG_RESULT()
 442       fi
 443       use_add_ons="$use_add_ons $libc_add_on"
 444       add_ons_pfx="$add_ons_pfx $libc_add_on/"
 445       test -z "$libc_add_on_canonical" ||
 446       add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
 447     fi
 448   done
 449   # Use echo to strip excess whitespace.
 450   add_ons="`echo $use_add_ons`"
 451 fi
 452 AC_SUBST(add_ons)
 453 AC_SUBST(add_on_subdirs)
 454
 455
 456 ###
 457 ### I put this here to prevent those annoying emails from people who cannot
 458 ### read and try to compile glibc on unsupported platforms.  --drepper
 459 ###
 460 ### By using the undocumented --enable-hacker-mode option for configure
 461 ### one can skip this test to make the configuration not fail for unsupported
 462 ### platforms.
 463 ###
 464 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
 465   case "$machine-$host_os" in
 466   *-linux* | *-gnu* | arm*-none* | powerpc-aix4.3.*)
 467     ;;
 468   *)
 469     echo "*** The GNU C library is currently not available for this platform."
 470     echo "*** So far nobody cared to port it and if there is no volunteer it"
 471     echo "*** might never happen.  So, if you have interest to see glibc on"
 472     echo "*** this platform visit"
 473     echo "***   http://www.gnu.org/software/libc/porting.html"
 474     echo "*** and join the group of porters"
 475     exit 1
 476     ;;
 477   esac
 478 fi
 479
 480 dnl We need to use [ and ] for other purposes for a while now.
 481 changequote(,)dnl
 482 # Expand the configuration machine name into a subdirectory by architecture
 483 # type and particular chip.  If an add-on configure fragment already set
 484 # base_machine, we don't change it.
 485 test -n "$base_machine" || case "$machine" in
 486 a29k | am29000) base_machine=a29k machine=a29k ;;
 487 alpha*)         base_machine=alpha machine=alpha/$machine ;;
 488 c3[012])        base_machine=cx0 machine=cx0/c30 ;;
 489 c4[04])         base_machine=cx0 machine=cx0/c40 ;;
 490 hppa*64*)       base_machine=hppa machine=hppa/hppa64 ;;
 491 hppa*)          base_machine=hppa machine=hppa/hppa1.1 ;;
 492 i[34567]86)     base_machine=i386 machine=i386/$machine ;;
 493 ia64)           base_machine=ia64 machine=ia64 ;;
 494 m680?0)         base_machine=m68k machine=m68k/$machine ;;
 495 m68k)           base_machine=m68k machine=m68k/m68020 ;;
 496 m88???)         base_machine=m88k machine=m88k/$machine ;;
 497 m88k)           base_machine=m88k machine=m88k/m88100 ;;
 498 powerpc)        base_machine=powerpc machine=powerpc/powerpc32 ;;
 499 powerpc64)      base_machine=powerpc machine=powerpc/powerpc64 ;;
 500 s390)           base_machine=s390 machine=s390/s390-32 ;;
 501 s390x)          base_machine=s390 machine=s390/s390-64 ;;
 502 sh3*)           base_machine=sh machine=sh/sh3 ;;
 503 sh4*)           base_machine=sh machine=sh/sh4 ;;
 504 sparc | sparcv[67])
 505                 base_machine=sparc machine=sparc/sparc32 ;;
 506 sparcv8 | supersparc | hypersparc)
 507                 base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
 508 sparcv8plus | sparcv8plusa | sparcv9)
 509                 base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
 510 sparcv8plusb | sparcv9b)
 511                 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
 512 sparc64)
 513                 base_machine=sparc machine=sparc/sparc64 ;;
 514 sparc64b)
 515                 base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
 516 *)              base_machine=$machine ;;
 517 esac
 518 changequote([,])dnl
 519 AC_SUBST(base_machine)
 520
 521 if test "$base_machine" = "i386"; then
 522   AC_DEFINE(USE_REGPARMS)
 523 fi
 524
 525 # Compute the list of sysdep directories for this configuration.
 526 # This can take a while to compute.
 527 sysdep_dir=$srcdir/sysdeps
 528 AC_MSG_CHECKING(sysdep dirs)
 529 dnl We need to use [ and ] for other purposes for a while now.
 530 changequote(,)dnl
 531 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
 532 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
 533
 534 case "$os" in
 535 gnu*)
 536   base_os=mach/hurd ;;
 537 netbsd* | 386bsd* | freebsd* | bsdi*)
 538   base_os=unix/bsd/bsd4.4 ;;
 539 osf* | sunos* | ultrix* | newsos* | dynix* | *bsd*)
 540   base_os=unix/bsd ;;
 541 sysv* | isc* | esix* | sco* | minix* | irix4* | linux*)
 542   base_os=unix/sysv ;;
 543 irix6*)
 544   base_os=unix/sysv/irix6/$os ;;
 545 solaris[2-9]*)
 546   base_os=unix/sysv/sysv4 ;;
 547 hpux*)
 548   base_os=unix/sysv/hpux/$os ;;
 549 aix4.3*)
 550   base_os=unix/sysv/aix/aix4.3 ;;
 551 none)
 552   base_os=standalone ;;
 553 *)
 554   base_os='' ;;
 555 esac
 556
 557 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
 558 tail=$os
 559 ostry=$os
 560 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
 561   ostry="$ostry /$o"
 562   tail=$o
 563 done
 564 o=`echo $tail | sed 's/[0-9]*$//'`
 565 if test $o != $tail; then
 566   ostry="$ostry /$o"
 567 fi
 568 # For linux-gnu, try linux-gnu, then linux.
 569 o=`echo $tail | sed 's/-.*$//'`
 570 if test $o != $tail; then
 571   ostry="$ostry /$o"
 572 fi
 573
 574 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
 575 base=
 576 tail=$base_os
 577 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
 578   set $b
 579   base="$base /$1"
 580   tail="$2"
 581 done
 582
 583 # For sparc/sparc32, try sparc/sparc32 and then sparc.
 584 mach=
 585 tail=$machine${submachine:+/$submachine}
 586 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
 587   set $m
 588   # Prepend the machine's FPU directory unless --without-fp.
 589   if test "$with_fp" = yes; then
 590     mach="$mach /$1/fpu"
 591   else
 592     mach="$mach /$1/nofpu"
 593   fi
 594   mach="$mach /$1"
 595   tail="$2"
 596 done
 597
 598 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
 599 changequote([,])dnl
 600
 601 # Find what sysdep directories exist.
 602 sysnames_add_ons=
 603 sysnames=
 604 for b in $base ''; do
 605   for m0 in $mach ''; do
 606     for v in /$vendor ''; do
 607       test "$v" = / && continue
 608       for o in /$ostry ''; do
 609         test "$o" = / && continue
 610         for m in $mach ''; do
 611           for d in $add_ons_pfx ''; do
 612             for a in $add_ons_sfx ''; do
 613               if test -n "$m0$m0sub$b$v$o$m$msub"; then
 614                 try_srcdir="${srcdir}/"
 615                 case "$d" in
 616                 /*) try_srcdir= ;;
 617                 esac
 618                 try="${d}sysdeps$m0$m0sub$b$v$o$m$msub$a"
 619                 test -n "$enable_debug_configure" &&
 620                 echo "$0 [DEBUG]: try $try" >&2
 621                 if test -d "$try_srcdir$try"; then
 622                   sysnames="$sysnames $try"
 623                   { test -n "$o" || test -n "$b"; } && os_used=t
 624                   { test -n "$m" || test -n "$m0"; } && machine_used=t
 625                   case x${m0:-$m} in
 626                   x*/$submachine) submachine_used=t ;;
 627                   esac
 628                   if test -n "$d"; then
 629                     case "$sysnames_add_ons" in
 630                     *" $d "*) ;;
 631                     *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
 632                     esac
 633                   fi
 634                 fi
 635               fi
 636             done
 637           done
 638         done
 639       done
 640     done
 641   done
 642 done
 643
 644 if test -z "$os_used" && test "$os" != none; then
 645   AC_MSG_ERROR(Operating system $os is not supported.)
 646 fi
 647 if test -z "$machine_used" && test "$machine" != none; then
 648   AC_MSG_ERROR(The $machine is not supported.)
 649 fi
 650 if test -z "$submachine_used" && test -n "$submachine"; then
 651   AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
 652 fi
 653 AC_SUBST(submachine)
 654
 655 # We have now validated the configuration.
 656
 657
 658 # If using ELF, look for an `elf' subdirectory of each machine directory.
 659 # We prepend these rather than inserting them whereever the machine appears
 660 # because things specified by the machine's ELF ABI should override
 661 # OS-specific things, and should always be the same for any OS on the
 662 # machine (otherwise what's the point of an ABI?).
 663 if test "$elf" = yes; then
 664   elf_dirs=
 665   for d in $add_ons_pfx ''; do
 666     for m in $mach; do
 667       if test -d $srcdir/${d}sysdeps$m/elf; then
 668         elf_dirs="$elf_dirs ${d}sysdeps$m/elf"
 669       fi
 670     done
 671   done
 672   sysnames="`echo $elf_dirs | sed -e 's,//,/,g'` $sysnames"
 673 fi
 674
 675
 676 # Expand the list of system names into a full list of directories
 677 # from each element's parent name and Implies file (if present).
 678 set $sysnames
 679 names=
 680 while test $# -gt 0; do
 681   name=$1
 682   shift
 683
 684   case " $names " in *" $name "*)
 685     # Already in the list.
 686     continue
 687   esac
 688
 689   # Report each name as we discover it, so there is no long pause in output.
 690   echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
 691
 692   name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
 693
 694   case $name in
 695     /*) xsrcdir= ;;
 696     *)  xsrcdir=$srcdir/ ;;
 697   esac
 698   test -n "$enable_debug_configure" &&
 699   echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
 700
 701   if test -f $xsrcdir$name/Implies; then
 702     # Collect more names from the `Implies' file (removing comments).
 703     implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/Implies`"
 704     implied=
 705     for x in $implied_candidate; do
 706       found=no
 707       if test -d $xsrcdir$name_base/$x; then
 708         implied="$implied $name_base/$x";
 709         found=yes
 710       fi
 711       for d in $add_ons_pfx ''; do
 712         try="${d}sysdeps/$x"
 713         case $d in
 714          /*) try_srcdir= ;;
 715          *) try_srcdir=$srcdir/ ;;
 716         esac
 717         test -n "$enable_debug_configure" &&
 718          echo "[DEBUG]: $name implied $x try($d) {$try_srcdir}$try" >&2
 719         if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
 720         then
 721           implied="$implied $try"
 722           found=yes
 723           case "$sysnames_add_ons" in
 724           *" $d "*) ;;
 725           *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
 726           esac
 727         fi
 728       done
 729       if test $found = no; then
 730         AC_MSG_WARN($name/Implies specifies nonexistent $x)
 731       fi
 732     done
 733   else
 734     implied=
 735   fi
 736
 737   # Add NAME to the list of names.
 738   names="$names $name"
 739
 740   # Find the parent of NAME, using the empty string if it has none.
 741 changequote(,)dnl
 742   parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
 743 changequote([,])dnl
 744
 745   # Add the names implied by NAME, and NAME's parent (if it has one), to
 746   # the list of names to be processed (the argument list).  We prepend the
 747   # implied names to the list and append the parent.  We want implied
 748   # directories to come before further directories inferred from the
 749   # configuration components; this ensures that for sysv4, unix/common
 750   # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
 751   # after sysv4).
 752   sysnames="`echo $implied $* $parent`"
 753   test -n "$sysnames" && set $sysnames
 754 done
 755
 756 # Add the default directories.
 757 default_sysnames=sysdeps/generic
 758 if test "$elf" = yes; then
 759   default_sysnames="sysdeps/generic/elf $default_sysnames"
 760 fi
 761 sysnames="$names $default_sysnames"
 762 AC_SUBST(sysnames)
 763 # The other names were emitted during the scan.
 764 AC_MSG_RESULT($default_sysnames)
 765
 766 # Collect the list of add-ons that supply partial sysdeps trees.
 767 sysdeps_add_ons=
 768 for add_on in $add_ons; do
 769   case "$add_on" in
 770   /*) xsrcdir= ;;
 771   *) xsrcdir="$srcdir/" ;;
 772   esac
 773
 774   test -d "$xsrcdir$add_on/sysdeps" || {
 775     case "$configured_add_ons " in
 776     *" $add_on "*) ;;
 777     *|'')
 778       AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
 779       ;;
 780     esac
 781     continue
 782   }
 783
 784   sysdeps_add_ons="$sysdeps_add_ons $add_on"
 785   case "$sysnames_add_ons" in
 786   *" $add_on/ "*) ;;
 787   *|'')
 788     AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
 789     continue ;;
 790   esac
 791
 792   found=no
 793   for d in $sysnames; do
 794     case "$d" in
 795     $add_on/sysdeps/*) ;;
 796     *) continue ;;
 797     esac
 798     (cd "$xsrcdir$d" && for f in *[[!~]]; do
 799        case "$f" in
 800        sys|bits)
 801          for ff in $f/*.h; do
 802            test -d "$ff" || { test -e "$ff" && exit 88; }
 803          done
 804          ;;
 805        *)
 806          test -d "$f" || { test -e "$f" && exit 88; }
 807          ;;
 808        esac
 809      done)
 810     if test $? -eq 88; then
 811       found=yes
 812       break
 813     fi
 814   done
 815   if test $found = no; then
 816     AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
 817   fi
 818 done
 819 AC_SUBST(sysdeps_add_ons)
 820
 821
 822 ### Locate tools.
 823
 824 AC_PROG_INSTALL
 825 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
 826   # The makefiles need to use a different form to find it in $srcdir.
 827   INSTALL='\$(..)./scripts/install-sh -c'
 828 fi
 829 AC_PROG_LN_S
 830
 831 AC_PROG_CC
 832 if test $host != $build; then
 833   AC_CHECK_PROGS(BUILD_CC, gcc cc)
 834 fi
 835 AC_SUBST(cross_compiling)
 836 AC_PROG_CPP
 837 # We need the C++ compiler only for testing.
 838 AC_PROG_CXX
 839 LIBC_PROG_BINUTILS
 840 AC_SUBST(MIG)dnl Needed by sysdeps/mach/configure.in
 841
 842 # Accept binutils 2.13 or newer.
 843 AC_CHECK_PROG_VER(AS, $AS, --version,
 844                   [GNU assembler.* \([0-9]*\.[0-9.]*\)],
 845                   [2.1[3-9]*], AS=: critic_missing="$critic_missing as")
 846 AC_CHECK_PROG_VER(LD, $LD, --version,
 847                   [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
 848                   [2.1[3-9]*], LD=: critic_missing="$critic_missing ld")
 849
 850 # We need the physical current working directory.  We cannot use the
 851 # "pwd -P" shell builtin since that's not portable.  Instead we try to
 852 # find a pwd binary.  Note that assigning to the PWD environment
 853 # variable might have some interesting side effects, so we don't do
 854 # that.
 855 AC_PATH_PROG(PWD_P, pwd, no)
 856 if test "$PWD_P" = no; then
 857   AC_MSG_ERROR(*** A pwd binary could not be found.)
 858 fi
 859
 860 # These programs are version sensitive.
 861 AC_CHECK_TOOL_PREFIX
 862 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
 863   [version \([egcygnustpi-]*[0-9.]*\)], [3.4* | 4.[0-9]* ],
 864   critic_missing="$critic_missing gcc")
 865 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
 866   [GNU Make[^0-9]*\([0-9][0-9.]*\)],
 867   [3.79* | 3.[89]*], critic_missing="$critic_missing make")
 868
 869 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
 870   [GNU gettext.* \([0-9]*\.[0-9.]*\)],
 871   [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
 872   MSGFMT=: aux_missing="$aux_missing msgfmt")
 873 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
 874   [GNU texinfo.* \([0-9][0-9.]*\)],
 875   [4.*],
 876   MAKEINFO=: aux_missing="$aux_missing makeinfo")
 877 AC_CHECK_PROG_VER(SED, sed, --version,
 878   [GNU sed version \([0-9]*\.[0-9.]*\)],
 879   [3.0[2-9]*|3.[1-9]*|[4-9]*],
 880   SED=: aux_missing="$aux_missing sed")
 881
 882 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
 883 case "x$AUTOCONF" in
 884 xno|x|x:) AUTOCONF=no ;;
 885 *)
 886   AC_CACHE_CHECK(dnl
 887 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
 888   if (cd $srcdir; $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1); then
 889     libc_cv_autoconf_works=yes
 890   else
 891     libc_cv_autoconf_works=no
 892   fi])
 893   test $libc_cv_autoconf_works = yes || AUTOCONF=no
 894   ;;
 895 esac
 896 if test "x$with_cvs" = xyes && test "x$AUTOCONF" = xno; then
 897   # If --without-cvs they probably won't change configure.in, so no complaints.
 898   aux_missing="$aux_missing autoconf"
 899 fi
 900
 901 test -n "$critic_missing" && AC_MSG_ERROR([
 902 *** These critical programs are missing or too old:$critic_missing
 903 *** Check the INSTALL file for required versions.])
 904
 905 test -n "$aux_missing" && AC_MSG_WARN([
 906 *** These auxiliary programs are missing or incompatible versions:$aux_missing
 907 *** some features will be disabled.
 908 *** Check the INSTALL file for required versions.])
 909
 910 # if using special system headers, find out the compiler's sekrit
 911 # header directory and add that to the list.  NOTE: Only does the right
 912 # thing on a system that doesn't need fixincludes.  (Not presently a problem.)
 913 if test -n "$sysheaders"; then
 914   ccheaders=`$CC -print-file-name=include`
 915   SYSINCLUDES="-nostdinc -isystem $ccheaders \
 916 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
 917   if test -n "$CXX"; then
 918     cxxversion=`$CXX -dumpversion 2>&AS_MESSAGE_LOG_FD` &&
 919     cxxmachine=`$CXX -dumpmachine 2>&AS_MESSAGE_LOG_FD` &&
 920     cxxheaders=`$CXX -print-file-name=../../../../include/c++/`"$cxxversion" &&
 921     CXX_SYSINCLUDES="-isystem $cxxheaders \
 922 -isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
 923   fi
 924 fi
 925 AC_SUBST(SYSINCLUDES)
 926 AC_SUBST(CXX_SYSINCLUDES)
 927
 928 # check if ranlib is necessary
 929 AC_CACHE_CHECK(whether ranlib is necessary, libc_cv_ranlib_necessary, [dnl
 930 cat > conftest.c <<EOF
 931 int a;
 932 char b;
 933 void c(void) {}
 934 EOF
 935 $CC $CFLAGS $CPPFLAGS -c conftest.c
 936 $AR cr conftest.a conftest.o
 937 cp conftest.a conftest2.a
 938 $RANLIB conftest.a
 939 if cmp -s conftest.a conftest2.a; then
 940   libc_cv_ranlib_necessary=no
 941 else
 942   libc_cv_ranlib_necessary=yes
 943 fi
 944 rm -rf conftest*])
 945 if test "$libc_cv_ranlib_necessary" = no; then
 946  RANLIB=:
 947 fi
 948
 949 # Test if LD_LIBRARY_PATH contains the notation for the current directory
 950 # since this would lead to problems installing/building glibc.
 951 # LD_LIBRARY_PATH contains the current directory if one of the following
 952 # is true:
 953 # - one of the terminals (":" and ";") is the first or last sign
 954 # - two terminals occur directly after each other
 955 # - the path contains an element with a dot in it
 956 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
 957 changequote(,)dnl
 958 case ${LD_LIBRARY_PATH} in
 959   [:\;]* | *[:\;] | *[:\;][:\;]* |  *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
 960     ld_library_path_setting="contains current directory"
 961     ;;
 962   *)
 963     ld_library_path_setting="ok"
 964     ;;
 965 esac
 966 changequote([,])dnl
 967 AC_MSG_RESULT($ld_library_path_setting)
 968 if test "$ld_library_path_setting" != "ok"; then
 969 AC_MSG_ERROR([
 970 *** LD_LIBRARY_PATH shouldn't contain the current directory when
 971 *** building glibc. Please change the environment variable
 972 *** and run configure again.])
 973 fi
 974
 975 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
 976 if $CC -v -static-libgcc 2>&1 | grep -q 'unrecognized option.*static-libgcc'; then
 977   libc_cv_gcc_static_libgcc=
 978 else
 979   libc_cv_gcc_static_libgcc=-static-libgcc
 980 fi])
 981 AC_SUBST(libc_cv_gcc_static_libgcc)
 982
 983 AC_PATH_PROG(BASH, bash, no)
 984 if test "$BASH" != no &&
 985    $BASH -c 'test "$BASH_VERSINFO" \
 986              && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
 987   libc_cv_have_bash2=yes
 988 else
 989   libc_cv_have_bash2=no
 990 fi
 991 AC_SUBST(libc_cv_have_bash2)
 992
 993 dnl We need a ksh compatible shell for tzselect.
 994 if test "$BASH" = no; then
 995   AC_PATH_PROG(KSH, ksh, no)
 996   if test "$KSH" = no; then
 997     libc_cv_have_ksh=no
 998   else
 999     libc_cv_have_ksh=yes
1000   fi
1001 else
1002   KSH="$BASH"
1003   AC_SUBST(KSH)
1004   libc_cv_have_ksh=yes
1005 fi
1006 AC_SUBST(libc_cv_have_ksh)
1007
1008 AC_PROG_AWK
1009 AC_PATH_PROG(PERL, perl, no)
1010 if test "$PERL" != no &&
1011    (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1012   PERL=no
1013 fi
1014 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1015              $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1016 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1017
1018 AC_CACHE_CHECK(for signed size_t type, libc_cv_signed_size_t, [dnl
1019 echo '#include <stddef.h>
1020 FOOBAR __SIZE_TYPE__ FOOBAR' > conftest.c
1021 if eval "$ac_cpp conftest.c 2>/dev/null" \
1022 | grep '^FOOBAR.*unsigned.*FOOBAR$' >/dev/null; then
1023   libc_cv_signed_size_t=no
1024 else
1025   libc_cv_signed_size_t=yes
1026 fi
1027 rm -f conftest*])
1028 if test $libc_cv_signed_size_t = yes; then
1029   dnl Do this by hand instead of AC_DEFINE so can add #undef to avoid warnings.
1030   cat >> confdefs.h <<\EOF
1031 #undef __SIZE_TYPE__
1032 #define __SIZE_TYPE__ unsigned
1033 EOF
1034 fi
1035
1036 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1037 AC_TRY_COMPILE(dnl
1038 [#define __need_size_t
1039 #define __need_wchar_t
1040 #include <stddef.h>
1041 #define __need_NULL
1042 #include <stddef.h>], [size_t size; wchar_t wchar;
1043 #ifdef offsetof
1044 #error stddef.h ignored __need_*
1045 #endif
1046 if (&size == NULL || &wchar == NULL) abort ();],
1047                libc_cv_friendly_stddef=yes,
1048                libc_cv_friendly_stddef=no)])
1049 if test $libc_cv_friendly_stddef = yes; then
1050   config_vars="$config_vars
1051 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1052 fi
1053
1054 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1055                libc_cv_need_minus_P, [dnl
1056 cat > conftest.S <<EOF
1057 #include "confdefs.h"
1058 /* Nothing whatsoever.  */
1059 EOF
1060 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1061   libc_cv_need_minus_P=no
1062 else
1063   libc_cv_need_minus_P=yes
1064 fi
1065 rm -f conftest*])
1066 if test $libc_cv_need_minus_P = yes; then
1067   config_vars="$config_vars
1068 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1069 fi
1070
1071 AC_MSG_CHECKING(whether .text pseudo-op must be used)
1072 AC_CACHE_VAL(libc_cv_dot_text, [dnl
1073 cat > conftest.s <<EOF
1074 .text
1075 EOF
1076 libc_cv_dot_text=
1077 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1078   libc_cv_dot_text=.text
1079 fi
1080 rm -f conftest*])
1081 if test -z "$libc_cv_dot_text"; then
1082   AC_MSG_RESULT(no)
1083 else
1084   AC_MSG_RESULT(yes)
1085 fi
1086
1087 AC_CACHE_CHECK(for assembler global-symbol directive,
1088                libc_cv_asm_global_directive, [dnl
1089 libc_cv_asm_global_directive=UNKNOWN
1090 for ac_globl in .globl .global .EXPORT; do
1091   cat > conftest.s <<EOF
1092         ${libc_cv_dot_text}
1093         ${ac_globl} foo
1094 foo:
1095 EOF
1096   if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1097     libc_cv_asm_global_directive=${ac_globl}
1098   fi
1099   rm -f conftest*
1100   test $libc_cv_asm_global_directive != UNKNOWN && break
1101 done])
1102 if test $libc_cv_asm_global_directive = UNKNOWN; then
1103   AC_MSG_ERROR(cannot determine asm global directive)
1104 else
1105   AC_DEFINE_UNQUOTED(ASM_GLOBAL_DIRECTIVE, ${libc_cv_asm_global_directive})
1106 fi
1107
1108 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1109 cat > conftest.s <<EOF
1110 ${libc_cv_dot_text}
1111 foo:
1112 .set glibc_conftest_frobozz,foo
1113 $libc_cv_asm_global_directive glibc_conftest_frobozz
1114 EOF
1115 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1116 # (but it doesn't work), so we must do a linking check to be sure.
1117 cat > conftest1.c <<\EOF
1118 extern int glibc_conftest_frobozz;
1119 void _start() { glibc_conftest_frobozz = 1; }
1120 EOF
1121 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1122             -nostartfiles -nostdlib \
1123             -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1124   libc_cv_asm_set_directive=yes
1125 else
1126   libc_cv_asm_set_directive=no
1127 fi
1128 rm -f conftest*])
1129 if test $libc_cv_asm_set_directive = yes; then
1130   AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1131 fi
1132
1133 AC_CACHE_CHECK(for assembler .type directive prefix,
1134                libc_cv_asm_type_prefix, [dnl
1135 libc_cv_asm_type_prefix=no
1136 for ac_try_prefix in '@' '%' '#'; do
1137   cat > conftest.s <<EOF
1138         ${libc_cv_dot_text}
1139         ${libc_cv_asm_global_directive} foo
1140         .type foo, ${ac_try_prefix}object
1141         .size foo, 1
1142 foo:
1143         .byte 1
1144 EOF
1145   if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1146     libc_cv_asm_type_prefix=${ac_try_prefix}
1147   fi
1148   rm -f conftest*
1149   test "x$libc_cv_asm_type_prefix" != xno && break
1150 done])
1151 if test "x$libc_cv_asm_type_prefix" != xno; then
1152   AC_DEFINE_UNQUOTED(ASM_TYPE_DIRECTIVE_PREFIX, ${libc_cv_asm_type_prefix})
1153 fi
1154
1155 AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
1156 [cat > conftest.s <<EOF
1157 ${libc_cv_dot_text}
1158 _sym:
1159 .symver _sym,sym@VERS
1160 EOF
1161 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1162   libc_cv_asm_symver_directive=yes
1163 else
1164   libc_cv_asm_symver_directive=no
1165 fi
1166 rm -f conftest*])
1167 AC_CACHE_CHECK(for ld --version-script, libc_cv_ld_version_script_option, [dnl
1168 if test $libc_cv_asm_symver_directive = yes; then
1169   cat > conftest.s <<EOF
1170 ${libc_cv_dot_text}
1171 _sym:
1172 .symver _sym,sym@VERS
1173 EOF
1174   cat > conftest.map <<EOF
1175 VERS_1 {
1176         global: sym;
1177 };
1178
1179 VERS_2 {
1180         global: sym;
1181 } VERS_1;
1182 EOF
1183   if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1184     if AC_TRY_COMMAND([${CC-cc} $CFLAGS $LDFLAGS -shared
1185                                 -o conftest.so conftest.o
1186                                 -nostartfiles -nostdlib
1187                                 -Wl,--version-script,conftest.map
1188                        1>&AS_MESSAGE_LOG_FD]);
1189     then
1190       libc_cv_ld_version_script_option=yes
1191     else
1192       libc_cv_ld_version_script_option=no
1193     fi
1194   else
1195     libc_cv_ld_version_script_option=no
1196   fi
1197 else
1198   libc_cv_ld_version_script_option=no
1199 fi
1200 rm -f conftest*])
1201 if test $shared != no &&
1202    test $libc_cv_asm_symver_directive = yes &&
1203    test $libc_cv_ld_version_script_option = yes &&
1204    test $enable_versioning = yes; then
1205   VERSIONING=yes
1206   AC_DEFINE(DO_VERSIONING)
1207 else
1208   VERSIONING=no
1209 fi
1210 AC_SUBST(VERSIONING)
1211
1212 if test $elf = yes && test $shared != no && test $VERSIONING = no; then
1213   echo "\
1214 *** WARNING: You should not compile GNU libc without versioning. Not using
1215 *** versioning will introduce incompatibilities so that old binaries
1216 *** will not run anymore.
1217 *** For versioning you need recent binutils (binutils-2.8.1.0.23 or newer)."
1218 fi
1219 if test $elf = yes; then
1220   AC_CACHE_CHECK(for .previous assembler directive,
1221                  libc_cv_asm_previous_directive, [dnl
1222   cat > conftest.s <<EOF
1223 .section foo_section
1224 .previous
1225 EOF
1226   if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1227     libc_cv_asm_previous_directive=yes
1228   else
1229     libc_cv_asm_previous_directive=no
1230   fi
1231   rm -f conftest*])
1232   if test $libc_cv_asm_previous_directive = yes; then
1233     AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1234   else
1235     AC_CACHE_CHECK(for .popsection assembler directive,
1236                    libc_cv_asm_popsection_directive, [dnl
1237     cat > conftest.s <<EOF
1238 .pushsection foo_section
1239 .popsection
1240 EOF
1241     if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1242       libc_cv_asm_popsection_directive=yes
1243     else
1244       libc_cv_asm_popsection_directive=no
1245     fi
1246     rm -f conftest*])
1247     if test $libc_cv_asm_popsection_directive = yes; then
1248       AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1249     fi
1250   fi
1251   AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1252                  libc_cv_asm_protected_directive, [dnl
1253   cat > conftest.s <<EOF
1254 .protected foo
1255 foo:
1256 .hidden bar
1257 bar:
1258 EOF
1259   if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1260     libc_cv_asm_protected_directive=yes
1261   else
1262     libc_cv_asm_protected_directive=no
1263   fi
1264   rm -f conftest*])
1265   AC_SUBST(libc_cv_asm_protected_directive)
1266   AC_DEFINE(HAVE_PROTECTED)
1267   AC_DEFINE(HAVE_HIDDEN)
1268
1269   if test $libc_cv_asm_protected_directive = yes; then
1270     AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1271                  libc_cv_visibility_attribute,
1272                  [cat > conftest.c <<EOF
1273                   int foo __attribute__ ((visibility ("hidden"))) = 1;
1274                   int bar __attribute__ ((visibility ("protected"))) = 1;
1275 EOF
1276                   libc_cv_visibility_attribute=no
1277                   if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1278                     if grep '\.hidden.*foo' conftest.s >/dev/null; then
1279                       if grep '\.protected.*bar' conftest.s >/dev/null; then
1280                         libc_cv_visibility_attribute=yes
1281                       fi
1282                     fi
1283                   fi
1284                   rm -f conftest.[cs]
1285                  ])
1286     if test $libc_cv_visibility_attribute = yes; then
1287       AC_DEFINE(HAVE_VISIBILITY_ATTRIBUTE)
1288     fi
1289   fi
1290
1291   if test $libc_cv_visibility_attribute = yes; then
1292     AC_CACHE_CHECK(for broken __attribute__((visibility())),
1293                  libc_cv_broken_visibility_attribute,
1294                  [cat > conftest.c <<EOF
1295                   int foo (int x);
1296                   int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1297                   int bar (int x) { return x; }
1298 EOF
1299                   libc_cv_broken_visibility_attribute=yes
1300                   if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s1>&AS_MESSAGE_LOG_FD); then
1301 changequote(,)dnl
1302                     if grep '\.hidden[  _]foo' conftest.s >/dev/null; then
1303 changequote([,])dnl
1304                       libc_cv_broken_visibility_attribute=no
1305                     fi
1306                   fi
1307                   rm -f conftest.c conftest.s
1308                  ])
1309     if test $libc_cv_broken_visibility_attribute = yes; then
1310       AC_DEFINE(HAVE_BROKEN_VISIBILITY_ATTRIBUTE)
1311     fi
1312   fi
1313
1314   AC_CACHE_CHECK(for broken __attribute__((alias())),
1315                  libc_cv_broken_alias_attribute,
1316                  [cat > conftest.c <<EOF
1317                   extern int foo (int x) __asm ("xyzzy");
1318                   int bar (int x) { return x; }
1319                   extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1320                   extern int dfoo;
1321                   extern __typeof (dfoo) dfoo __asm ("abccb");
1322                   int dfoo = 1;
1323 EOF
1324                   libc_cv_broken_alias_attribute=yes
1325                   if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1326                     if grep 'xyzzy' conftest.s >/dev/null &&
1327                        grep 'abccb' conftest.s >/dev/null; then
1328                       libc_cv_broken_alias_attribute=no
1329                     fi
1330                   fi
1331                   rm -f conftest.c conftest.s
1332                  ])
1333   if test $libc_cv_broken_alias_attribute = yes; then
1334     AC_DEFINE(HAVE_BROKEN_ALIAS_ATTRIBUTE)
1335   fi
1336
1337   if test $libc_cv_visibility_attribute = yes; then
1338     AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1339                  libc_cv_have_sdata_section,
1340                  [echo "int i;" > conftest.c
1341                   libc_cv_have_sdata_section=no
1342                   if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1343                      | grep '\.sdata' >/dev/null; then
1344                     libc_cv_have_sdata_section=yes
1345                   fi
1346                   rm -f conftest.c conftest.so
1347                  ])
1348     if test $libc_cv_have_sdata_section = yes; then
1349       AC_DEFINE(HAVE_SDATA_SECTION)
1350     fi
1351   fi
1352
1353   AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1354                  libc_cv_initfini_array, [dnl
1355   cat > conftest.c <<EOF
1356 int _start (void) { return 0; }
1357 int __start (void) { return 0; }
1358 int foo (void) { return 1; }
1359 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1360 EOF
1361   if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -o conftest conftest.c
1362                      -static -nostartfiles -nostdlib 1>&AS_MESSAGE_LOG_FD])
1363   then
1364     if readelf -S conftest | fgrep INIT_ARRAY > /dev/null; then
1365       libc_cv_initfini_array=yes
1366     else
1367       libc_cv_initfini_array=no
1368     fi
1369   else
1370     libc_cv_initfini_array=no
1371   fi
1372   rm -f conftest*])
1373   if test $libc_cv_initfini_array != yes; then
1374     AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1375   fi
1376
1377   AC_CACHE_CHECK(for libunwind-support in compiler,
1378                  libc_cv_cc_with_libunwind, [
1379     cat > conftest.c <<EOF
1380 int main (void) { return 0; }
1381 EOF
1382     if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1383        conftest.c -v 2>&1 >/dev/null | grep -q " -lunwind "; then
1384       libc_cv_cc_with_libunwind=yes
1385     else
1386       libc_cv_cc_with_libunwind=no
1387     fi
1388     rm -f conftest*])
1389   AC_SUBST(libc_cv_cc_with_libunwind)
1390   if test $libc_cv_cc_with_libunwind = yes; then
1391     AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1392   fi
1393
1394   AC_CACHE_CHECK(for -z nodelete option,
1395                  libc_cv_z_nodelete, [dnl
1396   cat > conftest.c <<EOF
1397 int _start (void) { return 42; }
1398 EOF
1399   if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1400                      -fPIC -shared -o conftest.so conftest.c
1401                      -nostartfiles -nostdlib
1402                      -Wl,--enable-new-dtags,-z,nodelete 1>&AS_MESSAGE_LOG_FD])
1403   then
1404     libc_cv_z_nodelete=yes
1405   else
1406     libc_cv_z_nodelete=no
1407   fi
1408   rm -f conftest*])
1409   AC_SUBST(libc_cv_z_nodelete)
1410
1411   AC_CACHE_CHECK(for -z nodlopen option,
1412                  libc_cv_z_nodlopen, [dnl
1413   cat > conftest.c <<EOF
1414 int _start (void) { return 42; }
1415 EOF
1416   if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1417                         -fPIC -shared -o conftest.so conftest.c
1418                         -nostartfiles -nostdlib
1419                         -Wl,--enable-new-dtags,-z,nodlopen 1>&AS_MESSAGE_LOG_FD])
1420   then
1421     libc_cv_z_nodlopen=yes
1422   else
1423     libc_cv_z_nodlopen=no
1424   fi
1425   rm -f conftest*])
1426   AC_SUBST(libc_cv_z_nodlopen)
1427
1428   AC_CACHE_CHECK(for -z initfirst option,
1429                  libc_cv_z_initfirst, [dnl
1430   cat > conftest.c <<EOF
1431 int _start (void) { return 42; }
1432 EOF
1433   if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1434                         -fPIC -shared -o conftest.so conftest.c
1435                         -nostartfiles -nostdlib
1436                         -Wl,--enable-new-dtags,-z,initfirst 1>&AS_MESSAGE_LOG_FD])
1437   then
1438     libc_cv_z_initfirst=yes
1439   else
1440     libc_cv_z_initfirst=no
1441   fi
1442   rm -f conftest*])
1443   AC_SUBST(libc_cv_z_initfirst)
1444
1445   AC_CACHE_CHECK(for -z relro option,
1446                  libc_cv_z_relro, [dnl
1447   libc_cv_z_relro=no
1448   if AC_TRY_COMMAND([${CC-cc} -v --help 2>&1|grep "z relro" 1>&AS_MESSAGE_LOG_FD])
1449   then
1450     if AC_TRY_COMMAND([${CC-cc} -Wl,--verbose 2>&1|grep DATA_SEGMENT_RELRO_END 1>&AS_MESSAGE_LOG_FD])
1451     then
1452       libc_cv_z_relro=yes
1453     fi
1454   fi])
1455   AC_SUBST(libc_cv_z_relro)
1456   if test $libc_cv_z_relro = yes; then
1457     AC_DEFINE(HAVE_Z_RELRO)
1458   fi
1459
1460   AC_CACHE_CHECK(for -Bgroup option,
1461                  libc_cv_Bgroup, [dnl
1462   cat > conftest.c <<EOF
1463 int _start (void) { return 42; }
1464 EOF
1465   if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1466                               -fPIC -shared -o conftest.so conftest.c
1467                               -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1468   then
1469     libc_cv_Bgroup=yes
1470   else
1471     libc_cv_Bgroup=no
1472   fi
1473   rm -f conftest*])
1474   AC_SUBST(libc_cv_Bgroup)
1475
1476   AC_CACHE_CHECK(for libgcc_s suffix,
1477                  libc_cv_libgcc_s_suffix, [dnl
1478   cat > conftest.c <<EOF
1479 int main (void) { return 0; }
1480 EOF
1481 changequote(,)dnl
1482   libc_cv_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1483                            -fPIC -shared -shared-libgcc -o conftest.so \
1484                            conftest.c -v 2>&1 >/dev/null \
1485                            | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
1486 changequote([,])dnl
1487   rm -f conftest*])
1488   AC_SUBST(libc_cv_libgcc_s_suffix)
1489
1490   AC_CACHE_CHECK(for --as-needed option,
1491                  libc_cv_as_needed, [dnl
1492   cat > conftest.c <<EOF
1493 int main (void) { return 0; }
1494 EOF
1495   if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1496                               -fPIC -shared -o conftest.so conftest.c
1497                               -lgcc_s$libc_cv_libgcc_s_suffix -Wl,--as-needed
1498                               -nostdlib 1>&AS_MESSAGE_LOG_FD])
1499   then
1500     libc_cv_as_needed=yes
1501   else
1502     libc_cv_as_needed=no
1503   fi
1504   rm -f conftest*])
1505   AC_SUBST(libc_cv_as_needed)
1506
1507   ASFLAGS_config=
1508   AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1509                  libc_cv_as_noexecstack, [dnl
1510   cat > conftest.c <<EOF
1511 void foo (void) { }
1512 EOF
1513   if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1514                      -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1515      && grep -q .note.GNU-stack conftest.s \
1516      && AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -Wa,--noexecstack
1517                        -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1518   then
1519     libc_cv_as_noexecstack=yes
1520   else
1521     libc_cv_as_noexecstack=no
1522   fi
1523   rm -f conftest*])
1524   if test $libc_cv_as_noexecstack = yes; then
1525     ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1526   fi
1527   AC_SUBST(ASFLAGS_config)
1528
1529   AC_CACHE_CHECK(for -z combreloc,
1530                  libc_cv_z_combreloc, [dnl
1531   cat > conftest.c <<EOF
1532 extern int bar (int);
1533 extern int mumble;
1534 int foo (void) { return bar (mumble); }
1535 EOF
1536   if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1537                         -fPIC -shared -o conftest.so conftest.c
1538                         -nostdlib -nostartfiles
1539                         -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1540   then
1541 dnl The following test is a bit weak.  We must use a tool which can test
1542 dnl cross-platform since the gcc used can be a cross compiler.  Without
1543 dnl introducing new options this is not easily doable.  Instead use a tool
1544 dnl which always is cross-platform: readelf.  To detect whether -z combreloc
1545 dnl look for a section named .rel.dyn.
1546     if readelf -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1547       libc_cv_z_combreloc=yes
1548     else
1549       libc_cv_z_combreloc=no
1550     fi
1551   else
1552     libc_cv_z_combreloc=no
1553   fi
1554   rm -f conftest*])
1555   if test "$libc_cv_z_combreloc" = yes; then
1556     AC_DEFINE(HAVE_Z_COMBRELOC)
1557   fi
1558   AC_SUBST(libc_cv_z_combreloc)
1559
1560   AC_CACHE_CHECK(for -z execstack,
1561                  libc_cv_z_execstack, [dnl
1562   cat > conftest.c <<EOF
1563 int _start (void) { return 42; }
1564 EOF
1565   if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1566                               -fPIC -shared -o conftest.so conftest.c
1567                               -Wl,-z,execstack -nostdlib
1568                               1>&AS_MESSAGE_LOG_FD])
1569   then
1570     libc_cv_z_execstack=yes
1571   else
1572     libc_cv_z_execstack=no
1573   fi
1574   rm -f conftest*])
1575   AC_SUBST(libc_cv_z_execstack)
1576
1577   AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1578   cat > conftest.c <<EOF
1579 int foo;
1580 main () { return 0;}
1581 EOF
1582   if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -pie -fpie
1583                               -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD])
1584   then
1585     libc_cv_fpie=yes
1586   else
1587     libc_cv_fpie=no
1588   fi
1589   rm -f conftest*])
1590
1591   AC_SUBST(libc_cv_fpie)
1592 fi
1593
1594 AC_CACHE_CHECK(for -fno-toplevel-reorder, libc_cv_fno_toplevel_reorder, [dnl
1595 cat > conftest.c <<EOF
1596 int foo;
1597 EOF
1598 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder
1599                             conftest.c 1>&AS_MESSAGE_LOG_FD])
1600 then
1601   libc_cv_fno_toplevel_reorder=yes
1602 else
1603   libc_cv_fno_toplevel_reorder=no
1604 fi
1605 rm -f conftest*])
1606 if test $libc_cv_fno_toplevel_reorder = yes; then
1607   fno_unit_at_a_time=-fno-toplevel-reorder
1608 else
1609   fno_unit_at_a_time=-fno-unit-at-a-time
1610 fi
1611 AC_SUBST(fno_unit_at_a_time)
1612
1613 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1614 cat > conftest.c <<EOF
1615 int foo;
1616 main () { return 0;}
1617 EOF
1618 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -fstack-protector
1619                             -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD])
1620 then
1621   libc_cv_ssp=yes
1622 else
1623   libc_cv_ssp=no
1624 fi
1625 rm -f conftest*])
1626 AC_SUBST(libc_cv_ssp)
1627
1628 if test $elf != yes; then
1629   AC_CACHE_CHECK(for .init and .fini sections, libc_cv_have_initfini,
1630                  [AC_TRY_COMPILE(, [asm (".section .init");
1631                                     asm (".section .fini");
1632                                     asm ("${libc_cv_dot_text}");],
1633                                  libc_cv_have_initfini=yes,
1634                                  libc_cv_have_initfini=no)])
1635   AC_SUBST(libc_cv_have_initfini)dnl
1636   if test $libc_cv_have_initfini = yes; then
1637     AC_DEFINE(HAVE_INITFINI)
1638   fi
1639 fi
1640
1641 if test $elf = yes; then
1642   AC_CACHE_CHECK(whether cc puts quotes around section names,
1643                  libc_cv_have_section_quotes,
1644                  [cat > conftest.c <<EOF
1645                   static const int foo
1646                   __attribute__ ((section ("bar"))) = 1;
1647 EOF
1648                   if ${CC-cc} -S conftest.c -o conftest.s; then
1649                     if grep '\.section.*"bar"' conftest.s >/dev/null; then
1650                       libc_cv_have_section_quotes=yes
1651                     else
1652                       libc_cv_have_section_quotes=no
1653                     fi
1654                   else
1655                     libc_cv_have_section_quotes=unknown
1656                   fi
1657                   rm -f conftest.[cs]
1658                  ])
1659   if test $libc_cv_have_section_quotes = yes; then
1660     AC_DEFINE(HAVE_SECTION_QUOTES)
1661   fi
1662 fi
1663
1664 dnl AC_CHECK_ASM_UNDERSCORE([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
1665 AC_DEFUN(AC_CHECK_ASM_UNDERSCORE,
1666 [cat > conftest.$ac_ext <<EOF
1667 dnl This sometimes fails to find confdefs.h, for some reason.
1668 dnl [#]line $LINENO "[$]0"
1669 [#]line $LINENO "configure"
1670 #include "confdefs.h"
1671 void underscore_test(void) {
1672 return; }
1673 EOF
1674 if AC_TRY_EVAL(ac_compile); then
1675   if grep _underscore_test conftest* >/dev/null; then
1676     ifelse([$1], , :, [rm -f conftest*
1677     $1])
1678   else
1679     ifelse([$2], , , [rm -f conftest*
1680     $2])
1681   fi
1682 else
1683   echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
1684   cat conftest.$ac_ext >&AS_MESSAGE_LOG_FD
1685   ifelse([$2], , , [rm -f conftest*
1686   $2])
1687 fi
1688 rm -f conftest*])
1689
1690 if test $elf = yes; then
1691   libc_cv_asm_underscores=no
1692 else
1693   if test $ac_cv_prog_cc_works = yes; then
1694     AC_CACHE_CHECK(for _ prefix on C symbol names, libc_cv_asm_underscores,
1695                    [AC_TRY_LINK([asm ("_glibc_foobar:");], [glibc_foobar ();],
1696                                 libc_cv_asm_underscores=yes,
1697                                 libc_cv_asm_underscores=no)])
1698   else
1699     AC_CACHE_CHECK(for _ prefix on C symbol names, libc_cv_asm_underscores,
1700                    [AC_CHECK_ASM_UNDERSCORE(libc_cv_asm_underscores=yes,
1701                                             libc_cv_asm_underscores=no)])
1702   fi
1703 fi
1704 if test $libc_cv_asm_underscores = no; then
1705   AC_DEFINE(NO_UNDERSCORES)
1706 fi
1707
1708 if test $elf = yes; then
1709   libc_cv_weak_symbols=yes
1710 fi
1711
1712 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1713                [dnl
1714 cat > conftest.s <<EOF
1715 ${libc_cv_dot_text}
1716 ${libc_cv_asm_global_directive} foo
1717 foo:
1718 .weak foo
1719 .weak bar; bar = foo
1720 EOF
1721 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1722   libc_cv_asm_weak_directive=yes
1723 else
1724   libc_cv_asm_weak_directive=no
1725 fi
1726 rm -f conftest*])
1727
1728 if test $libc_cv_asm_weak_directive = no; then
1729   AC_CACHE_CHECK(for assembler .weakext directive,
1730                  libc_cv_asm_weakext_directive,
1731                  [dnl
1732 cat > conftest.s <<EOF
1733 ${libc_cv_dot_text}
1734 ${libc_cv_asm_global_directive} foo
1735 foo:
1736 .weakext bar foo
1737 .weakext baz
1738 ${libc_cv_asm_global_directive} baz
1739 baz:
1740 EOF
1741   if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1742     libc_cv_asm_weakext_directive=yes
1743   else
1744     libc_cv_asm_weakext_directive=no
1745   fi
1746   rm -f conftest*])
1747
1748 fi # no .weak
1749
1750 if test $libc_cv_asm_weak_directive = yes; then
1751   AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1752 elif test $libc_cv_asm_weakext_directive = yes; then
1753   AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1754 fi
1755
1756 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1757 case $machine in
1758   sparc/sparc64*) cfi_offset=2047;;
1759   *) cfi_offset=0;;
1760 esac
1761 cat > conftest.s <<EOF
1762         .text
1763         .type   func,%function
1764 func:
1765         .cfi_startproc
1766         .cfi_remember_state
1767         .cfi_rel_offset 1, $cfi_offset
1768         .cfi_endproc
1769 EOF
1770 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1771   libc_cv_asm_cfi_directives=yes
1772 else
1773   libc_cv_asm_cfi_directives=no
1774 fi
1775 rm -f conftest*])
1776 if test $libc_cv_asm_cfi_directives = yes; then
1777   AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1778 fi
1779
1780 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1781 cat > conftest.c <<\EOF
1782 _start () {}
1783 int __eh_pc;
1784 __throw () {}
1785 EOF
1786 dnl No \ in command here because it ends up inside ''.
1787 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1788                             -nostdlib -nostartfiles -Wl,--no-whole-archive
1789                             -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1790   libc_cv_ld_no_whole_archive=yes
1791 else
1792   libc_cv_ld_no_whole_archive=no
1793 fi
1794 rm -f conftest*])
1795 if test $libc_cv_ld_no_whole_archive = yes; then
1796   no_whole_archive=-Wl,--no-whole-archive
1797 fi
1798 AC_SUBST(no_whole_archive)dnl
1799
1800 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1801 cat > conftest.c <<\EOF
1802 _start () {}
1803 int __eh_pc;
1804 __throw () {}
1805 EOF
1806 dnl No \ in command here because it ends up inside ''.
1807 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1808                             -nostdlib -nostartfiles -fexceptions
1809                             -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1810   libc_cv_gcc_exceptions=yes
1811 else
1812   libc_cv_gcc_exceptions=no
1813 fi
1814 rm -f conftest*])
1815 if test $libc_cv_gcc_exceptions = yes; then
1816   exceptions=-fexceptions
1817 fi
1818 AC_SUBST(exceptions)dnl
1819
1820 if test "$host_cpu" = powerpc ; then
1821 # Check for a bug present in at least versions 2.8.x of GCC
1822 # and versions 1.0.x of EGCS.
1823 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1824 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1825                libc_cv_c_asmcr0_bug='no',
1826                libc_cv_c_asmcr0_bug='yes')])
1827 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1828   AC_DEFINE(BROKEN_PPC_ASM_CR0)
1829 fi
1830 fi
1831
1832 dnl Check whether compiler understands __builtin_expect.
1833 AC_CACHE_CHECK(for __builtin_expect, libc_cv_gcc_builtin_expect,
1834 [cat > conftest.c <<EOF
1835 #line $LINENO "configure"
1836 int foo (int a)
1837 {
1838   a = __builtin_expect (a, 10);
1839   return a == 10 ? 0 : 1;
1840 }
1841 EOF
1842 dnl No \ in command here because it ends up inside ''.
1843 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles
1844                             -o conftest conftest.c -lgcc >&AS_MESSAGE_LOG_FD]); then
1845   libc_cv_gcc_builtin_expect=yes
1846 else
1847   libc_cv_gcc_builtin_expect=no
1848 fi
1849 rm -f conftest*])
1850 if test "$libc_cv_gcc_builtin_expect" = yes; then
1851   AC_DEFINE(HAVE_BUILTIN_EXPECT)
1852 fi
1853
1854 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1855 cat > conftest.c <<\EOF
1856 void zero (void *x)
1857 {
1858   __builtin_memset (x, 0, 1000);
1859 }
1860 EOF
1861 dnl
1862 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1863 then
1864   libc_cv_gcc_builtin_memset=no
1865 else
1866   libc_cv_gcc_builtin_memset=yes
1867 fi
1868 rm -f conftest* ])
1869 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1870   AC_DEFINE(HAVE_BUILTIN_MEMSET)
1871 fi
1872
1873 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1874 cat > conftest.c <<\EOF
1875 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1876 char *foo (const char *a, const char *b)
1877 {
1878   return __builtin_strstr (a, b);
1879 }
1880 EOF
1881 dnl
1882 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1883 then
1884   libc_cv_gcc_builtin_redirection=yes
1885 else
1886   libc_cv_gcc_builtin_redirection=no
1887 fi
1888 rm -f conftest* ])
1889 if test "$libc_cv_gcc_builtin_redirection" = yes ; then
1890   AC_DEFINE(HAVE_BUILTIN_REDIRECTION)
1891 fi
1892
1893 dnl Check whether the compiler supports the __thread keyword.
1894 if test "x$use__thread" != xno; then
1895   AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1896   [cat > conftest.c <<\EOF
1897 __thread int a = 42;
1898 EOF
1899   if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1900     libc_cv_gcc___thread=yes
1901   else
1902     libc_cv_gcc___thread=no
1903   fi
1904   rm -f conftest*])
1905   if test "$libc_cv_gcc___thread" = yes; then
1906     AC_DEFINE(HAVE___THREAD)
1907   fi
1908 else
1909   libc_cv_gcc___thread=no
1910 fi
1911
1912 if test "$libc_cv_gcc___thread" = yes; then
1913   dnl Check whether the compiler supports the tls_model attribute.
1914   AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1915   cat > conftest.c <<\EOF
1916 extern __thread int a __attribute__((tls_model ("initial-exec")));
1917 EOF
1918   if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1919     libc_cv_gcc_tls_model_attr=yes
1920   else
1921     libc_cv_gcc_tls_model_attr=no
1922   fi
1923   rm -f conftest*])
1924   if test "$libc_cv_gcc_tls_model_attr" = yes; then
1925     AC_DEFINE(HAVE_TLS_MODEL_ATTRIBUTE)
1926   fi
1927 fi
1928
1929 dnl Check whether we have the gd library available.
1930 AC_MSG_CHECKING(for libgd)
1931 if test "$with_gd" != "no"; then
1932   old_CFLAGS="$CFLAGS"
1933   CFLAGS="$CFLAGS $libgd_include"
1934   old_LDFLAGS="$LDFLAGS"
1935   LDFLAGS="$LDFLAGS $libgd_ldflags"
1936   old_LIBS="$LIBS"
1937   LIBS="$LIBS -lgd -lpng -lz -lm"
1938   AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1939   CFLAGS="$old_CFLAGS"
1940   LDFLAGS="$old_LDFLAGS"
1941   LIBS="$old_LIBS"
1942 else
1943   LIBGD=no
1944 fi
1945 AC_MSG_RESULT($LIBGD)
1946 AC_SUBST(LIBGD)
1947
1948 # SELinux detection
1949 if test x$with_selinux = xno ; then
1950   have_selinux=no;
1951 else
1952   # See if we have the SELinux library
1953   AC_CHECK_LIB(selinux, is_selinux_enabled,
1954                have_selinux=yes, have_selinux=no)
1955   # See if we have the SELinux header with the NSCD permissions in it.
1956   if test x$have_selinux = xyes ; then
1957     AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
1958     AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
1959                     [#ifdef NSCD__SHMEMHOST
1960                      return 0;
1961                      #else
1962                      #error NSCD__SHMEMHOST not defined
1963                      #endif],
1964                     have_selinux=yes, have_selinux=no)
1965     AC_MSG_RESULT($have_selinux)
1966   fi
1967
1968   if test x$with_selinux = xyes ; then
1969     if test x$have_selinux = xno ; then
1970       AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
1971     fi
1972   fi
1973 fi
1974 # Check if we're building with SELinux support.
1975 if test "x$have_selinux" = xyes; then
1976   AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1977
1978   # See if we have the libaudit library
1979   AC_CHECK_LIB(audit, audit_log_user_avc_message,
1980                have_libaudit=yes, have_libaudit=no)
1981   if test "x$have_libaudit" = xyes; then
1982     AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1983   fi
1984   AC_SUBST(have_libaudit)
1985 fi
1986 AC_SUBST(have_selinux)
1987
1988 dnl check for the size of 'long double'.
1989 AC_CHECK_SIZEOF(long double, 0)
1990 sizeof_long_double=$ac_cv_sizeof_long_double
1991 AC_SUBST(sizeof_long_double)
1992
1993 ### End of automated tests.
1994 ### Now run sysdeps configure fragments.
1995
1996 # They also can set these variables.
1997 use_ldconfig=no
1998 ldd_rewrite_script=no
1999 libc_cv_sysconfdir=$sysconfdir
2000 libc_cv_gcc_unwind_find_fde=no
2001 libc_cv_idn=no
2002
2003 # Iterate over all the sysdep directories we will use, running their
2004 # configure fragments, and looking for a uname implementation.
2005 uname=
2006 for dir in $sysnames; do
2007   case $dir in
2008     /*) dest=$dir ;;
2009     *)  dest=$srcdir/$dir ;;
2010   esac
2011   if test -r $dest/configure; then
2012     AC_MSG_RESULT(running configure fragment for $dir)
2013     . $dest/configure
2014   fi
2015 [
2016   if test -z "$uname"; then
2017     if test -r $dest/uname.c ||
2018        test -r $dest/uname.S ||
2019        { test -r $dest/syscalls.list &&
2020          grep '^uname[  ]' $dest/syscalls.list >/dev/null; }; then
2021       uname=$dir
2022     fi
2023   fi
2024 ]dnl
2025 done
2026
2027 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2028   AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2029 fi
2030 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2031
2032 # If we will use the generic uname implementation, we must figure out what
2033 # it will say by examining the system, and write the results in config-name.h.
2034 if test "$uname" = "sysdeps/generic"; then
2035
2036 changequote(,)dnl
2037   uname_sysname=`echo $config_os | sed 's/[0-9.]*$//'`
2038 changequote([,])dnl
2039   if test $uname_sysname != $config_os; then
2040     config_release=`echo $config_os | sed s/$uname_sysname//`
2041   fi
2042 dnl
2043 AC_DEFUN(LIBC_KERNEL_ID, [dnl
2044     if test -r /vmunix; then
2045       kernel_id=`strings /vmunix | grep UNIX`
2046     elif test -r /dynix; then
2047       kernel_id=`strings /dynix | grep DYNIX`
2048     else
2049       kernel_id=
2050     fi
2051 ])dnl
2052
2053   AC_CACHE_CHECK(OS release for uname, libc_cv_uname_release, [dnl
2054 LIBC_KERNEL_ID
2055 changequote(,)dnl
2056   kernel_release=`echo "$kernel_id" | sed 's/^[^0-9.]*\([0-9.]*\).*$/\1/'`
2057 changequote([,])dnl
2058   if test x`echo "$config_release" | sed "s/^$kernel_release//"` \
2059          != x$config_release; then
2060     # The configuration release is a substring of the kernel release.
2061     libc_cv_uname_release=$kernel_release
2062   elif test x$config_release != x; then
2063     libc_cv_uname_release=$config_release
2064   elif test x$kernel_release != x; then
2065     libc_cv_uname_release=$kernel_release
2066   else
2067     libc_cv_uname_release=unknown
2068   fi])
2069   uname_release="$libc_cv_uname_release"
2070
2071   AC_CACHE_CHECK(OS version for uname, libc_cv_uname_version, [dnl
2072 LIBC_KERNEL_ID
2073 changequote(,)dnl
2074   kernel_version=`echo "$kernel_id" | sed 's/^[^#]*#\([0-9]*\).*$/\1/'`
2075 changequote([,])dnl
2076   if test -n "$kernel_version"; then
2077     libc_cv_uname_version="$kernel_version"
2078   else
2079     libc_cv_uname_version=unknown
2080   fi])
2081   uname_version="$libc_cv_uname_version"
2082
2083 AC_SUBST(uname_sysname) AC_SUBST(uname_release) AC_SUBST(uname_version)dnl
2084   config_uname=config-name.h:config-name.in
2085 else
2086   # For non-generic uname, we don't need to create config-name.h at all.
2087   config_uname=
2088 fi
2089
2090 dnl This is tested by existing code and it's simpler to avoid changing it.
2091 AC_DEFINE(USE_IN_LIBIO)
2092
2093 # Test for old glibc 2.0.x headers so that they can be removed properly
2094 # Search only in includedir.
2095 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2096 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2097 then
2098   old_glibc_headers=yes
2099 else
2100   old_glibc_headers=no
2101 fi
2102 AC_MSG_RESULT($old_glibc_headers)
2103 if test ${old_glibc_headers} = yes; then
2104   AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2105   AC_MSG_WARN(*** be removed.)
2106 fi
2107 AC_SUBST(old_glibc_headers)
2108
2109 AC_SUBST(libc_cv_slibdir)
2110 AC_SUBST(libc_cv_localedir)
2111 AC_SUBST(libc_cv_sysconfdir)
2112 AC_SUBST(libc_cv_rootsbindir)
2113 AC_SUBST(libc_cv_forced_unwind)
2114
2115 AC_SUBST(use_ldconfig)
2116 AC_SUBST(ldd_rewrite_script)
2117
2118 AC_SUBST(elf) AC_SUBST(xcoff)
2119 if test $elf = yes; then
2120   AC_DEFINE(HAVE_ELF)
2121 fi
2122 if test $xcoff = yes; then
2123   AC_DEFINE(HAVE_XCOFF)
2124 fi
2125
2126 AC_SUBST(static)
2127 AC_SUBST(shared)
2128 if test $shared = default; then
2129   shared=$elf
2130 fi
2131
2132 AC_CACHE_CHECK([whether -fPIC is default], pic_default,
2133 [pic_default=yes
2134 cat > conftest.c <<EOF
2135 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2136 # error PIC is default.
2137 #endif
2138 EOF
2139 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2140   pic_default=no
2141 fi
2142 rm -f conftest.*])
2143 AC_SUBST(pic_default)
2144
2145 AC_SUBST(profile)
2146 AC_SUBST(omitfp)
2147 AC_SUBST(bounded)
2148 AC_SUBST(static_nss)
2149 AC_SUBST(nopic_initfini)
2150
2151 AC_SUBST(DEFINES)
2152
2153 dnl See sysdeps/mach/configure.in for this variable.
2154 AC_SUBST(mach_interface_list)
2155
2156 if test "`(cd $srcdir; pwd)`" = "`pwd`"; then
2157   config_makefile=
2158 else
2159   config_makefile=Makefile
2160 fi
2161
2162 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2163 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2164 AC_SUBST(VERSION)
2165 AC_SUBST(RELEASE)
2166
2167 AC_CONFIG_FILES([config.make ${config_makefile} ${config_uname}])
2168 AC_CONFIG_COMMANDS([default],[[
2169 case $CONFIG_FILES in *config.make*)
2170 echo "$config_vars" >> config.make;;
2171 esac
2172 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2173 AC_OUTPUT