[BZ #781, BZ #796]

[glibc.git] / configure.in

dnl Process this file with autoconf to produce a configure script.
AC_REVISION([$CVSid$])
AC_PREREQ(2.53)dnl		dnl Minimum Autoconf version required.
AC_INIT([GNU C Library], [(see version.h)], [glibc])
AC_CONFIG_SRCDIR([include/features.h])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_AUX_DIR([scripts])

if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
  AC_MSG_ERROR([you must configure in a separate build directory])
fi

# This will get text that should go into config.make.
config_vars=

# Check for a --with-gmp argument and set gmp-srcdir in config.make.
AC_ARG_WITH([gmp],
            AC_HELP_STRING([--with-gmp=DIRECTORY],
                           [find GMP source code in DIRECTORY (not needed)]),
	    [
case "$with_gmp" in
yes) AC_MSG_ERROR([--with-gmp requires an argument; use --with-gmp=DIRECTORY]) ;;
''|no) ;;
*) config_vars="$config_vars
gmp-srcdir = $withval" ;;
esac
])
# Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
AC_ARG_WITH([gd],
            AC_HELP_STRING([--with-gd=DIR],
                           [find libgd include dir and library with prefix DIR]),
	    [dnl
case "$with_gd" in
yes|''|no) ;;
*) libgd_include="-I$withval/include"
   libgd_ldflags="-L$withval/lib" ;;
esac
])
AC_ARG_WITH([gd-include],
            AC_HELP_STRING([--with-gd-include=DIR],
                           [find libgd include files in DIR]),
            [dnl
case "$with_gd_include" in
''|no) ;;
*) libgd_include="-I$withval" ;;
esac
])
AC_ARG_WITH([gd-lib],
            AC_HELP_STRING([--with-gd-lib=DIR],
                           [find libgd library files in DIR]),
            [dnl
case "$with_gd_lib" in
''|no) ;;
*) libgd_ldflags="-L$withval" ;;
esac
])

if test -n "$libgd_include"; then
  config_vars="$config_vars
CFLAGS-memusagestat.c = $libgd_include"
fi
if test -n "$libgd_ldflags"; then
  config_vars="$config_vars
libgd-LDFLAGS = $libgd_ldflags"
fi

dnl Arguments to specify presence of other packages/features.
AC_ARG_WITH([fp],
            AC_HELP_STRING([--with-fp],
                           [if using floating-point hardware @<:@default=yes@:>@]),
	    [with_fp=$withval],
	    [with_fp=yes])
AC_SUBST(with_fp)
AC_ARG_WITH([binutils],
            AC_HELP_STRING([--with-binutils=PATH],
                           [specify location of binutils (as and ld)]),
	    [path_binutils=$withval],
	    [path_binutils=''])
AC_ARG_WITH([elf],
            AC_HELP_STRING([--with-elf],
                           [if using the ELF object format]),
	    [elf=$withval],
	    [elf=no])
AC_ARG_WITH([selinux],
            AC_HELP_STRING([--with-selinux],
                           [if building with SELinux support]),
	    [with_selinux=$withval],
	    [with_selinux=auto])
AC_ARG_WITH([xcoff],
            AC_HELP_STRING([--with-xcoff],
                           [if using the XCOFF object format]),
	    [xcoff=$withval],
	    [xcoff=no])
AC_ARG_WITH([cvs],
            AC_HELP_STRING([--without-cvs],
                           [if CVS should not be used]),
	    [with_cvs=$withval],
	    [with_cvs=yes])
if test "$with_cvs" = yes; then
  if test -d $srcdir/CVS && grep :pserver: $srcdir/CVS/Root > /dev/null
  then
    with_cvs=no
  fi
fi
AC_SUBST(with_cvs)

AC_ARG_WITH([headers],
            AC_HELP_STRING([--with-headers=PATH],
	                   [location of system headers to use
			    (for example /usr/src/linux/include)
			    @<:@default=compiler default@:>@]),
	    [sysheaders=$withval],
	    [sysheaders=''])

AC_ARG_ENABLE([sanity-checks],
              AC_HELP_STRING([--disable-sanity-checks],
                             [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
	      [enable_sanity=$enableval],
	      [enable_sanity=yes])

AC_SUBST(enable_check_abi)
AC_ARG_ENABLE([check-abi],
	      AC_HELP_STRING([--enable-check-abi],
			     [do "make check-abi" in "make check" (no/warn/yes)
			      @<:@default=no@:>@]),
	      [enable_check_abi=$enableval],
	      [enable_check_abi=no])

dnl Arguments to enable or disable building the static, shared, profiled,
dnl and -fomit-frame-pointer libraries.
dnl I've disabled this for now since we cannot build glibc without static
dnl libraries built in the moment.
dnl AC_ARG_ENABLE([static],
dnl               AC_HELP_STRING([--enable-static],
dnl                              [build static library @<:@default=yes@:>@]),
dnl               [static=$enableval],
dnl               [static=yes])
static=yes
AC_ARG_ENABLE([shared],
              AC_HELP_STRING([--enable-shared],
                             [build shared library @<:@default=yes if GNU ld & ELF@:>@]),
	      [shared=$enableval],
	      [shared=default])
AC_ARG_ENABLE([profile],
              AC_HELP_STRING([--enable-profile],
                             [build profiled library @<:@default=yes@:>@]),
	      [profile=$enableval],
	      [profile=yes])
AC_ARG_ENABLE([omitfp],
              AC_HELP_STRING([--enable-omitfp],
                             [build undebuggable optimized library @<:@default=no@:>@]),
	      [omitfp=$enableval],
	      [omitfp=no])
AC_ARG_ENABLE([bounded],
              AC_HELP_STRING([--enable-bounded],
                             [build with runtime bounds checking @<:@default=no@:>@]),
	      [bounded=$enableval],
	      [bounded=no])
AC_ARG_ENABLE([versioning],
              AC_HELP_STRING([--disable-versioning],
                             [do not include versioning information in the library objects @<:@default=yes if supported@:>@]),
	      [enable_versioning=$enableval],
	      [enable_versioning=yes])

AC_ARG_ENABLE([oldest-abi],
              AC_HELP_STRING([--enable-oldest-abi=ABI],
                             [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
	      [oldest_abi=$enableval],
	      [oldest_abi=no])
if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
  oldest_abi=default
else
  AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
fi
AC_SUBST(oldest_abi)

dnl Generic infrastructure for drop-in additions to libc.
AC_ARG_ENABLE([add-ons],
              AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
                             [configure and build add-ons in DIR1,DIR2,...  search for add-ons if no parameter given]),
  [case "$enableval" in
    yes) add_ons=`cd $srcdir && echo */configure | sed -e 's!/configure!!g'`
	 add_ons_automatic=yes
	 test "$add_ons" = "*" && add_ons= ;;
    *) add_ons=`echo "$enableval" | sed 's/,/ /g'`
       add_ons_automatic=no ;;
   esac],
  [add_ons= add_ons_automatic=no])

dnl Let the user avoid using TLS.  Don't know why but...
AC_ARG_WITH([tls],
            AC_HELP_STRING([--with-tls],
                           [enable support for TLS]),
	    [usetls=$withval],
	    [usetls=yes])

AC_ARG_WITH([__thread],
            AC_HELP_STRING([--without-__thread],
                           [do not use TLS features even when supporting them]),
	    [use__thread=$withval],
	    [use__thread=yes])

AC_ARG_ENABLE([hidden-plt],
              AC_HELP_STRING([--disable-hidden-plt],
                             [do not hide internal function calls to avoid PLT]),
	      [hidden=$enableval],
	      [hidden=yes])
if test "x$hidden" = xno; then
  AC_DEFINE(NO_HIDDEN)
fi

AC_ARG_ENABLE([bind-now],
	      AC_HELP_STRING([--enable-bind-now],
			     [disable lazy relocations in DSOs]),
	      [bindnow=$enableval],
	      [bindnow=no])
AC_SUBST(bindnow)

dnl On some platforms we cannot use dynamic loading.  We must provide
dnl static NSS modules.
AC_ARG_ENABLE([static-nss],
              AC_HELP_STRING([--enable-static-nss],
                             [build static NSS modules @<:@default=no@:>@]),
	      [static_nss=$enableval],
	      [static_nss=no])
dnl Enable static NSS also if we build no shared objects.
if test x"$static_nss" = xyes || test x"$shared" = xno; then
  static_nss=yes
  AC_DEFINE(DO_STATIC_NSS)
fi

AC_ARG_ENABLE([force-install],
              AC_HELP_STRING([--disable-force-install],
                             [don't force installation of files from this package, even if they are older than the installed files]),
	      [force_install=$enableval],
	      [force_install=yes])
AC_SUBST(force_install)

dnl On some platforms we allow dropping compatibility with all kernel
dnl versions.
AC_ARG_ENABLE([kernel],
              AC_HELP_STRING([--enable-kernel=VERSION],
                             [compile for compatibility with kernel not older than VERSION]),
	      [minimum_kernel=$enableval],
	      [])
dnl Prevent unreasonable values.
if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
  # Better nothing than this.
  minimum_kernel=""
else
  if test "$minimum_kernel" = current; then
    minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
  fi
fi

dnl For the development we sometimes want gcc to issue even more warnings.
dnl This is not the default since many of the extra warnings are not
dnl appropriate.
AC_ARG_ENABLE([all-warnings],
	      AC_HELP_STRING([--enable-all-warnings],
                             [enable all useful warnings gcc can issue]),
	      [all_warnings=$enableval],
	      [])
AC_SUBST(all_warnings)

AC_CANONICAL_HOST

# The way shlib-versions is used to generate soversions.mk uses a
# fairly simplistic model for name recognition that can't distinguish
# i486-pc-linux-gnu fully from i486-pc-gnu.  So we mutate a $host_os
# of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
# tell.  This doesn't get used much beyond that, so it's fairly safe.
case "$host_os" in
linux*)
  ;;
gnu*)
  host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
  ;;
esac

# We keep the original values in `$config_*' and never modify them, so we
# can write them unchanged into config.make.  Everything else uses
# $machine, $vendor, and $os, and changes them whenever convenient.
config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os

# Don't allow vendor == "unknown"
test "$config_vendor" = unknown && config_vendor=
config_os="`echo $config_os | sed 's/^unknown-//'`"

# Some configurations imply other options.
case "$host_os" in
gnu* | linux* | bsd4.4* | netbsd* | freebsd*)
  # These systems always use GNU tools.
  gnu_ld=yes gnu_as=yes ;;
esac
case "$host_os" in
# i586-linuxaout is mangled into i586-pc-linux-gnuaout
linux*ecoff* | linux*aout* | gnu*aout* | gnu*ecoff*)
  ;;
gnu* | linux* | freebsd* | netbsd* | sysv4* | solaris2* | irix6*)
  # These systems (almost) always use the ELF format.
  elf=yes
  ;;
aix*)
  # These systems are always xcoff
  xcoff=yes
  elf=no
  ;;
esac

# The configure fragment of an add-on port can modify these to supplement
# or override the table in the case statement below.  No fragment should
# ever change the config_* variables, however.
machine=$config_machine
vendor=$config_vendor
os=$config_os

# config.guess on some IBM machines says `rs6000' instead of `powerpc'.
# Unify this here.
if test "$machine" = rs6000; then
  machine="powerpc"
fi

# Braindead PowerPC box with absolutely no FPU.
case "$machine-$host_os" in
  powerpc*-*soft)
    with_fp=no
    ;;
esac


# An add-on can set this when it the tuple to disable the sanity check below.
libc_config_ok=no

dnl Having this here, though empty, makes sure that if add-ons' fragments
dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
dnl our AC_OUTPUT will actually use it.
AC_CONFIG_SUBDIRS()

add_ons_sfx=
add_ons_pfx=
if test x"$add_ons" != x; then
  for f in $add_ons; do
    # Some sanity checks
    case "$f" in
    crypt)
      AC_MSG_ERROR([
*** It seems that you're using an old \`crypt' add-on.  crypt is now
*** part of glibc and using the old add-on will not work with this
*** release.  Start again with fresh sources and without the old
*** \`crypt' add-on.])
    ;;
    localedata)
      AC_MSG_ERROR([
*** It seems that you're using an old \`localedata' add-on.  localedata
*** is now part of glibc and using the old add-on will not work with
*** this release.  Start again with fresh sources and without the old
*** \`localedata' add-on.])
    ;;
    esac

    # Test whether such a subdir really exists.
    test -d $srcdir/$f || {
      AC_MSG_ERROR(add-on directory \"$f\" does not exist)
    }
  done

  # Now source each add-on's configure fragment.
  # The fragments can use $srcdir/$libc_add_on to find themselves,
  # and test $add_ons_automatic to see if they were explicitly requested.
  # A fragment can clear (or even change) $libc_add_on to affect
  # whether it goes into the list to be actually used in the build.
  use_add_ons=
  for libc_add_on in $add_ons; do
    libc_add_on_frag=$srcdir/$libc_add_on/configure
    if test -r $libc_add_on_frag; then
      AC_MSG_RESULT(running configure fragment for add-on $libc_add_on)
      . $libc_add_on_frag
    else
      AC_MSG_WARN(add-on fragment $libc_add_on_frag missing)
    fi
    if test -n "$libc_add_on"; then
      use_add_ons="$use_add_ons $libc_add_on"
      add_ons_pfx="$add_ons_pfx $libc_add_on/"
      add_ons_sfx="$add_ons_sfx /$libc_add_on"
    fi
  done
  # Use echo to strip excess whitespace.
  add_ons="`echo $use_add_ons`"
fi
AC_SUBST(add_ons)


###
### I put this here to prevent those annoying emails from people who cannot
### read and try to compile glibc on unsupported platforms.  --drepper
###
### By using the undocumented --enable-hacker-mode option for configure
### one can skip this test to make the configuration not fail for unsupported
### platforms.
###
if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
  case "$machine-$host_os" in
  *-linux* | *-gnu* | arm*-none* | powerpc-aix4.3.*)
    ;;
  *)
    echo "*** The GNU C library is currently not available for this platform."
    echo "*** So far nobody cared to port it and if there is no volunteer it"
    echo "*** might never happen.  So, if you have interest to see glibc on"
    echo "*** this platform visit"
    echo "***	http://www.gnu.org/software/libc/porting.html"
    echo "*** and join the group of porters"
    exit 1
    ;;
  esac
fi

dnl We need to use [ and ] for other purposes for a while now.
changequote(,)dnl
# Expand the configuration machine name into a subdirectory by architecture
# type and particular chip.  If an add-on configure fragment already set
# base_machine, we don't change it.
test -n "$base_machine" || case "$machine" in
a29k | am29000)	base_machine=a29k machine=a29k ;;
alpha*)		base_machine=alpha machine=alpha/$machine ;;
arm*)		base_machine=arm machine=arm/arm32/$machine ;;
c3[012])	base_machine=cx0 machine=cx0/c30 ;;
c4[04])		base_machine=cx0 machine=cx0/c40 ;;
hppa*64*)	base_machine=hppa machine=hppa/hppa64 ;;
hppa*)		base_machine=hppa machine=hppa/hppa1.1 ;;
i[34567]86)	base_machine=i386 machine=i386/$machine ;;
ia64)		base_machine=ia64 machine=ia64 ;;
m680?0)		base_machine=m68k machine=m68k/$machine ;;
m68k)		base_machine=m68k machine=m68k/m68020 ;;
m88???)		base_machine=m88k machine=m88k/$machine ;;
m88k)		base_machine=m88k machine=m88k/m88100 ;;
mips64*)	base_machine=mips64
		case "$CC $CFLAGS $CPPFLAGS " in
		*" -mabi=n32 "*) mips_cc_abi=n32 ;;
		*" -mabi=64 "*|*" -mabi=n64 "*) mips_cc_abi=64 ;;
		*" -mabi=32 "*|*" -mabi=o32 "*) mips_cc_abi=32 ;;
		*) mips_cc_abi=default ;;
		esac
		case $config_os in
		*abin32*) mips_config_abi=n32 ;;
		*abi64*|*abin64*) mips_config_abi=64 ;;
		*abi32*|*abio32*) mips_config_abi=32 ;;
		*) mips_config_abi=$mips_cc_abi ;;
		esac
		case $mips_config_abi in
		default) machine=mips/mips64/n32 mips_config_abi=n32 ;;
		n32) machine=mips/mips64/n32 ;;
		64) machine=mips/mips64/n64 ;;
		32) machine=mips/mips32/kern64 ;;
		esac
		machine=$machine/$config_machine
		if test $mips_config_abi != $mips_cc_abi; then
		  # This won't make it to config.make, but we want to
		  # set this in case configure tests depend on it.
		  CPPFLAGS="$CPPFLAGS -mabi=$mips_config_abi"
		fi
		;;
mips*)		base_machine=mips machine=mips/mips32/$machine ;;
powerpc)	base_machine=powerpc machine=powerpc/powerpc32 ;;
powerpc64)	base_machine=powerpc machine=powerpc/powerpc64 ;;
s390)           base_machine=s390 machine=s390/s390-32 ;;
s390x)          base_machine=s390 machine=s390/s390-64 ;;
sh3*)		base_machine=sh machine=sh/sh3 ;;
sh4*)		base_machine=sh machine=sh/sh4 ;;
sparc | sparcv[67])
		base_machine=sparc machine=sparc/sparc32 ;;
sparcv8 | supersparc | hypersparc)
		base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
sparcv8plus | sparcv8plusa | sparcv9)
		base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
sparcv8plusb | sparcv9b)
		base_machine=sparc machine=sparc/sparc32/sparcv9b ;;
sparc64)
		base_machine=sparc machine=sparc/sparc64 ;;
sparc64b)
		base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
thumb*)		base_machine=thumb machine=arm/thumb/$machine ;;
*)		base_machine=$machine ;;
esac
changequote([,])dnl
AC_SUBST(base_machine)

if test "$base_machine" = "i386"; then
  AC_DEFINE(USE_REGPARMS)
fi

# Compute the list of sysdep directories for this configuration.
# This can take a while to compute.
sysdep_dir=$srcdir/sysdeps
AC_MSG_CHECKING(sysdep dirs)
dnl We need to use [ and ] for other purposes for a while now.
changequote(,)dnl
# Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"

case "$os" in
gnu*)
  base_os=mach/hurd ;;
netbsd* | 386bsd* | freebsd* | bsdi*)
  base_os=unix/bsd/bsd4.4 ;;
osf* | sunos* | ultrix* | newsos* | dynix* | *bsd*)
  base_os=unix/bsd ;;
sysv* | isc* | esix* | sco* | minix* | irix4* | linux*)
  base_os=unix/sysv ;;
irix6*)
  base_os=unix/sysv/irix6/$os ;;
solaris[2-9]*)
  base_os=unix/sysv/sysv4 ;;
hpux*)
  base_os=unix/sysv/hpux/$os ;;
aix4.3*)
  base_os=unix/sysv/aix/aix4.3 ;;
none)
  base_os=standalone ;;
*)
  base_os='' ;;
esac

# For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
tail=$os
ostry=$os
while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
  ostry="$ostry /$o"
  tail=$o
done
o=`echo $tail | sed 's/[0-9]*$//'`
if test $o != $tail; then
  ostry="$ostry /$o"
fi
# For linux-gnu, try linux-gnu, then linux.
o=`echo $tail | sed 's/-.*$//'`
if test $o != $tail; then
  ostry="$ostry /$o"
fi

# For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
base=
tail=$base_os
while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
  set $b
  base="$base /$1"
  tail="$2"
done

# For sparc/sparc32, try sparc/sparc32 and then sparc.
mach=
tail=$machine
while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
  set $m
  # Prepend the machine's FPU directory unless --without-fp.
  if test "$with_fp" = yes; then
    mach="$mach /$1/fpu"
  else
    mach="$mach /$1/nofpu"
  fi
  mach="$mach /$1"
  tail="$2"
done

dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
changequote([,])dnl

# Find what sysdep directories exist.
sysnames=
IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}:"
for d in $add_ons_pfx ''; do
  for b in $base ''; do
    for m0 in $mach ''; do
      for v in /$vendor ''; do
	test "$v" = / && continue
	for o in /$ostry ''; do
	  test "$o" = / && continue
	  for m in $mach ''; do
	    for a in $add_ons_sfx ''; do
	      if test "$m0$b$v$o$m"; then
		try="${d}sysdeps$m0$b$v$o$m$a"
		test -n "$enable_debug_configure" &&
		echo "$0 [DEBUG]: try $try" >&2
		if test -d $srcdir/$try; then
		  sysnames="$sysnames $try"
		  { test -n "$o" || test -n "$b"; } && os_used=t
		  { test -n "$m" || test -n "$m0"; } && machine_used=t
		fi
	      fi
	    done
	  done
	done
      done
    done
  done
  if test -n "$d"; then
    try="${d}sysdeps/generic"
    test -n "$enable_debug_configure" &&
    echo "$0 DEBUG: try $try" >&2
    if test -d $srcdir/$try; then
      sysnames="$sysnames $try"
    fi
  fi
done
IFS="$ac_save_ifs"

if test -z "$os_used" && test "$os" != none; then
  AC_MSG_ERROR(Operating system $os is not supported.)
fi
if test -z "$machine_used" && test "$machine" != none; then
  AC_MSG_ERROR(The $machine is not supported.)
fi

# We have now validated the configuration.


# If using ELF, look for an `elf' subdirectory of each machine directory.
# We prepend these rather than inserting them whereever the machine appears
# because things specified by the machine's ELF ABI should override
# OS-specific things, and should always be the same for any OS on the
# machine (otherwise what's the point of an ABI?).
if test "$elf" = yes; then
  elf_dirs=
  for d in $add_ons_pfx ''; do
    for m in $mach; do
      if test -d $srcdir/${d}sysdeps$m/elf; then
	elf_dirs="$elf_dirs ${d}sysdeps$m/elf"
      fi
    done
  done
  sysnames="`echo $elf_dirs | sed -e 's,//,/,g'` $sysnames"
fi


# Expand the list of system names into a full list of directories
# from each element's parent name and Implies file (if present).
set $sysnames
names=
while test $# -gt 0; do
  name=$1
  shift

  case " $names " in *" $name "*)
    # Already in the list.
    continue
  esac

  # Report each name as we discover it, so there is no long pause in output.
  echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD

  name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`

  case $name in
    /*) xsrcdir= ;;
    *)  xsrcdir=$srcdir/ ;;
  esac
  test -n "$enable_debug_configure" &&
  echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2

  if test -f $xsrcdir$name/Implies; then
    # Collect more names from the `Implies' file (removing comments).
    implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/Implies`"
    implied=
    for x in $implied_candidate; do
      found=no
      if test -d $xsrcdir$name_base/$x; then
	implied="$implied $name_base/$x";
	found=yes
      fi
      for d in $add_ons_pfx ''; do
	try="${d}sysdeps/$x"
	case $d in
	 /*) try_srcdir= ;;
	 *) try_srcdir=$srcdir/ ;;
	esac
	test -n "$enable_debug_configure" &&
	 echo "[DEBUG]: $name implied $x try($d) {$try_srcdir}$try" >&2
	if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
	then
	  implied="$implied $try"
	  found=yes
	fi
      done
      if test $found = no; then
        AC_MSG_WARN($name/Implies specifies nonexistent $x)
      fi
    done
  else
    implied=
  fi

  # Add NAME to the list of names.
  names="$names $name"

  # Find the parent of NAME, using the empty string if it has none.
changequote(,)dnl
  parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
changequote([,])dnl

  # Add the names implied by NAME, and NAME's parent (if it has one), to
  # the list of names to be processed (the argument list).  We prepend the
  # implied names to the list and append the parent.  We want implied
  # directories to come before further directories inferred from the
  # configuration components; this ensures that for sysv4, unix/common
  # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
  # after sysv4).
  sysnames="`echo $implied $* $parent`"
  test -n "$sysnames" && set $sysnames
done

# Add the default directories.
default_sysnames=sysdeps/generic
if test "$elf" = yes; then
  default_sysnames="sysdeps/generic/elf $default_sysnames"
fi
sysnames="$names $default_sysnames"
AC_SUBST(sysnames)
# The other names were emitted during the scan.
AC_MSG_RESULT($default_sysnames)


### Locate tools.

AC_PROG_INSTALL
if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
  # The makefiles need to use a different form to find it in $srcdir.
  INSTALL='\$(..)./scripts/install-sh -c'
fi
AC_PROG_LN_S

AC_PROG_CC
if test $host != $build; then
  AC_CHECK_PROGS(BUILD_CC, gcc cc)
fi
AC_SUBST(cross_compiling)
AC_PROG_CPP
# We need the C++ compiler only for testing.
AC_PROG_CXX
LIBC_PROG_BINUTILS
AC_SUBST(MIG)dnl Needed by sysdeps/mach/configure.in

# Accept binutils 2.13 or newer.
AC_CHECK_PROG_VER(AS, $AS, --version,
		  [GNU assembler.* \([0-9]*\.[0-9.]*\)],
		  [2.1[3-9]*], AS=: critic_missing="$critic_missing as")
AC_CHECK_PROG_VER(LD, $LD, --version,
		  [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
		  [2.1[3-9]*], LD=: critic_missing="$critic_missing ld")

# We need the physical current working directory.  We cannot use the
# "pwd -P" shell builtin since that's not portable.  Instead we try to
# find a pwd binary.  Note that assigning to the PWD environment
# variable might have some interesting side effects, so we don't do
# that.
AC_PATH_PROG(PWD_P, pwd, no)
if test "$PWD_P" = no; then
  AC_MSG_ERROR(*** A pwd binary could not be found.)
fi

# These programs are version sensitive.
AC_CHECK_TOOL_PREFIX
AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
  [version \([egcygnustpi-]*[0-9.]*\)], [3.4* | 4.[0-9]* ],
  critic_missing="$critic_missing gcc")
AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
  [GNU Make[^0-9]*\([0-9][0-9.]*\)],
  [3.79* | 3.[89]*], critic_missing="$critic_missing make")

AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
  [GNU gettext.* \([0-9]*\.[0-9.]*\)],
  [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
  MSGFMT=: aux_missing="$aux_missing msgfmt")
AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
  [GNU texinfo.* \([0-9][0-9.]*\)],
  [4.*],
  MAKEINFO=: aux_missing="$aux_missing makeinfo")
AC_CHECK_PROG_VER(SED, sed, --version,
  [GNU sed version \([0-9]*\.[0-9.]*\)],
  [3.0[2-9]*|3.[1-9]*|[4-9]*],
  SED=: aux_missing="$aux_missing sed")

AC_CHECK_PROGS(AUTOCONF, autoconf, no)
case "x$AUTOCONF" in
xno|x|x:) AUTOCONF=no ;;
*)
  AC_CACHE_CHECK(dnl
whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
  if (cd $srcdir; $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1); then
    libc_cv_autoconf_works=yes
  else
    libc_cv_autoconf_works=no
  fi])
  test $libc_cv_autoconf_works = yes || AUTOCONF=no
  ;;
esac
if test "x$with_cvs" = xyes && test "x$AUTOCONF" = xno; then
  # If --without-cvs they probably won't change configure.in, so no complaints.
  aux_missing="$aux_missing autoconf"
fi

test -n "$critic_missing" && AC_MSG_ERROR([
*** These critical programs are missing or too old:$critic_missing
*** Check the INSTALL file for required versions.])

test -n "$aux_missing" && AC_MSG_WARN([
*** These auxiliary programs are missing or incompatible versions:$aux_missing
*** some features will be disabled.
*** Check the INSTALL file for required versions.])

# if using special system headers, find out the compiler's sekrit
# header directory and add that to the list.  NOTE: Only does the right
# thing on a system that doesn't need fixincludes.  (Not presently a problem.)
if test -n "$sysheaders"; then
  ccheaders=`$CC -print-file-name=include`
  SYSINCLUDES="-nostdinc -isystem $ccheaders \
-isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
fi
AC_SUBST(SYSINCLUDES)

# check if ranlib is necessary
AC_CACHE_CHECK(whether ranlib is necessary, libc_cv_ranlib_necessary, [dnl
cat > conftest.c <<EOF
int a;
char b;
void c(void) {}
EOF
$CC $CFLAGS $CPPFLAGS -c conftest.c
$AR cr conftest.a conftest.o
cp conftest.a conftest2.a
$RANLIB conftest.a
if cmp -s conftest.a conftest2.a; then
  libc_cv_ranlib_necessary=no
else
  libc_cv_ranlib_necessary=yes
fi
rm -rf conftest*])
if test "$libc_cv_ranlib_necessary" = no; then
 RANLIB=:
fi

# Test if LD_LIBRARY_PATH contains the notation for the current directory
# since this would lead to problems installing/building glibc.
# LD_LIBRARY_PATH contains the current directory if one of the following
# is true:
# - one of the terminals (":" and ";") is the first or last sign
# - two terminals occur directly after each other
# - the path contains an element with a dot in it
AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
changequote(,)dnl
case ${LD_LIBRARY_PATH} in
  [:\;]* | *[:\;] | *[:\;][:\;]* |  *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
    ld_library_path_setting="contains current directory"
    ;;
  *)
    ld_library_path_setting="ok"
    ;;
esac
changequote([,])dnl
AC_MSG_RESULT($ld_library_path_setting)
if test "$ld_library_path_setting" != "ok"; then
AC_MSG_ERROR([
*** LD_LIBRARY_PATH shouldn't contain the current directory when
*** building glibc. Please change the environment variable
*** and run configure again.])
fi

AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
if $CC -v -static-libgcc 2>&1 | grep -q 'unrecognized option.*static-libgcc'; then
  libc_cv_gcc_static_libgcc=
else
  libc_cv_gcc_static_libgcc=-static-libgcc
fi])
AC_SUBST(libc_cv_gcc_static_libgcc)

AC_PATH_PROG(BASH, bash, no)
if test "$BASH" != no &&
   $BASH -c 'test "$BASH_VERSINFO" \
	     && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
  libc_cv_have_bash2=yes
else
  libc_cv_have_bash2=no
fi
AC_SUBST(libc_cv_have_bash2)

dnl We need a ksh compatible shell for tzselect.
if test "$BASH" = no; then
  AC_PATH_PROG(KSH, ksh, no)
  if test "$KSH" = no; then
    libc_cv_have_ksh=no
  else
    libc_cv_have_ksh=yes
  fi
else
  KSH="$BASH"
  AC_SUBST(KSH)
  libc_cv_have_ksh=yes
fi
AC_SUBST(libc_cv_have_ksh)

AC_PROG_AWK
AC_PATH_PROG(PERL, perl, no)
if test "$PERL" != no &&
   (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
  PERL=no
fi
AC_PATH_PROG(INSTALL_INFO, install-info, no,
	     $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)

AC_CACHE_CHECK(for signed size_t type, libc_cv_signed_size_t, [dnl
echo '#include <stddef.h>
FOOBAR __SIZE_TYPE__ FOOBAR' > conftest.c
if eval "$ac_cpp conftest.c 2>/dev/null" \
| grep '^FOOBAR.*unsigned.*FOOBAR$' >/dev/null; then
  libc_cv_signed_size_t=no
else
  libc_cv_signed_size_t=yes
fi
rm -f conftest*])
if test $libc_cv_signed_size_t = yes; then
  dnl Do this by hand instead of AC_DEFINE so can add #undef to avoid warnings.
  cat >> confdefs.h <<\EOF
#undef __SIZE_TYPE__
#define __SIZE_TYPE__ unsigned
EOF
fi

AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
AC_TRY_COMPILE(dnl
[#define __need_size_t
#define __need_wchar_t
#include <stddef.h>
#define __need_NULL
#include <stddef.h>], [size_t size; wchar_t wchar;
#ifdef offsetof
#error stddef.h ignored __need_*
#endif
if (&size == NULL || &wchar == NULL) abort ();],
               libc_cv_friendly_stddef=yes,
               libc_cv_friendly_stddef=no)])
if test $libc_cv_friendly_stddef = yes; then
  config_vars="$config_vars
override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
fi

AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
	       libc_cv_need_minus_P, [dnl
cat > conftest.S <<EOF
#include "confdefs.h"
/* Nothing whatsoever.  */
EOF
if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
  libc_cv_need_minus_P=no
else
  libc_cv_need_minus_P=yes
fi
rm -f conftest*])
if test $libc_cv_need_minus_P = yes; then
  config_vars="$config_vars
asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
fi

AC_MSG_CHECKING(whether .text pseudo-op must be used)
AC_CACHE_VAL(libc_cv_dot_text, [dnl
cat > conftest.s <<EOF
.text
EOF
libc_cv_dot_text=
if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
  libc_cv_dot_text=.text
fi
rm -f conftest*])
if test -z "$libc_cv_dot_text"; then
  AC_MSG_RESULT(no)
else
  AC_MSG_RESULT(yes)
fi

AC_CACHE_CHECK(for assembler global-symbol directive,
	       libc_cv_asm_global_directive, [dnl
libc_cv_asm_global_directive=UNKNOWN
for ac_globl in .globl .global .EXPORT; do
  cat > conftest.s <<EOF
	${libc_cv_dot_text}
	${ac_globl} foo
foo:
EOF
  if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
    libc_cv_asm_global_directive=${ac_globl}
  fi
  rm -f conftest*
  test $libc_cv_asm_global_directive != UNKNOWN && break
done])
if test $libc_cv_asm_global_directive = UNKNOWN; then
  AC_MSG_ERROR(cannot determine asm global directive)
else
  AC_DEFINE_UNQUOTED(ASM_GLOBAL_DIRECTIVE, ${libc_cv_asm_global_directive})
fi

AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
cat > conftest.s <<EOF
${libc_cv_dot_text}
foo:
.set glibc_conftest_frobozz,foo
$libc_cv_asm_global_directive glibc_conftest_frobozz
EOF
# The alpha-dec-osf1 assembler gives only a warning for `.set'
# (but it doesn't work), so we must do a linking check to be sure.
cat > conftest1.c <<\EOF
extern int glibc_conftest_frobozz;
void _start() { glibc_conftest_frobozz = 1; }
EOF
if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
	    -nostartfiles -nostdlib \
	    -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
  libc_cv_asm_set_directive=yes
else
  libc_cv_asm_set_directive=no
fi
rm -f conftest*])
if test $libc_cv_asm_set_directive = yes; then
  AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
fi

AC_CACHE_CHECK(for assembler .type directive prefix,
	       libc_cv_asm_type_prefix, [dnl
libc_cv_asm_type_prefix=no
for ac_try_prefix in '@' '%' '#'; do
  cat > conftest.s <<EOF
	${libc_cv_dot_text}
	${libc_cv_asm_global_directive} foo
	.type foo, ${ac_try_prefix}object
	.size foo, 1
foo:
	.byte 1
EOF
  if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
    libc_cv_asm_type_prefix=${ac_try_prefix}
  fi
  rm -f conftest*
  test "x$libc_cv_asm_type_prefix" != xno && break
done])
if test "x$libc_cv_asm_type_prefix" != xno; then
  AC_DEFINE_UNQUOTED(ASM_TYPE_DIRECTIVE_PREFIX, ${libc_cv_asm_type_prefix})
fi

AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
[cat > conftest.s <<EOF
${libc_cv_dot_text}
_sym:
.symver _sym,sym@VERS
EOF
if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
  libc_cv_asm_symver_directive=yes
else
  libc_cv_asm_symver_directive=no
fi
rm -f conftest*])
AC_CACHE_CHECK(for ld --version-script, libc_cv_ld_version_script_option, [dnl
if test $libc_cv_asm_symver_directive = yes; then
  cat > conftest.s <<EOF
${libc_cv_dot_text}
_sym:
.symver _sym,sym@VERS
EOF
  cat > conftest.map <<EOF
VERS_1 {
	global: sym;
};

VERS_2 {
        global: sym;
} VERS_1;
EOF
  if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
    if AC_TRY_COMMAND([${CC-cc} $CFLAGS $LDFLAGS -shared
				-o conftest.so conftest.o
				-nostartfiles -nostdlib
				-Wl,--version-script,conftest.map
		       1>&AS_MESSAGE_LOG_FD]);
    then
      libc_cv_ld_version_script_option=yes
    else
      libc_cv_ld_version_script_option=no
    fi
  else
    libc_cv_ld_version_script_option=no
  fi
else
  libc_cv_ld_version_script_option=no
fi
rm -f conftest*])
if test $shared != no &&
   test $libc_cv_asm_symver_directive = yes &&
   test $libc_cv_ld_version_script_option = yes &&
   test $enable_versioning = yes; then
  VERSIONING=yes
  AC_DEFINE(DO_VERSIONING)
else
  VERSIONING=no
fi
AC_SUBST(VERSIONING)

if test $elf = yes && test $shared != no && test $VERSIONING = no; then
  echo "\
*** WARNING: You should not compile GNU libc without versioning. Not using
*** versioning will introduce incompatibilities so that old binaries
*** will not run anymore.
*** For versioning you need recent binutils (binutils-2.8.1.0.23 or newer)."
fi
if test $elf = yes; then
  AC_CACHE_CHECK(for .previous assembler directive,
		 libc_cv_asm_previous_directive, [dnl
  cat > conftest.s <<EOF
.section foo_section
.previous
EOF
  if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
    libc_cv_asm_previous_directive=yes
  else
    libc_cv_asm_previous_directive=no
  fi
  rm -f conftest*])
  if test $libc_cv_asm_previous_directive = yes; then
    AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
  else
    AC_CACHE_CHECK(for .popsection assembler directive,
		   libc_cv_asm_popsection_directive, [dnl
    cat > conftest.s <<EOF
.pushsection foo_section
.popsection
EOF
    if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
      libc_cv_asm_popsection_directive=yes
    else
      libc_cv_asm_popsection_directive=no
    fi
    rm -f conftest*])
    if test $libc_cv_asm_popsection_directive = yes; then
      AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
    fi
  fi
  AC_CACHE_CHECK(for .protected and .hidden assembler directive,
		 libc_cv_asm_protected_directive, [dnl
  cat > conftest.s <<EOF
.protected foo
foo:
.hidden bar
bar:
EOF
  if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
    libc_cv_asm_protected_directive=yes
  else
    libc_cv_asm_protected_directive=no
  fi
  rm -f conftest*])
  AC_SUBST(libc_cv_asm_protected_directive)
  AC_DEFINE(HAVE_PROTECTED)
  AC_DEFINE(HAVE_HIDDEN)

  if test $libc_cv_asm_protected_directive = yes; then
    AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
		 libc_cv_visibility_attribute,
		 [cat > conftest.c <<EOF
		  int foo __attribute__ ((visibility ("hidden"))) = 1;
		  int bar __attribute__ ((visibility ("protected"))) = 1;
EOF
		  libc_cv_visibility_attribute=no
		  if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
		    if grep '\.hidden.*foo' conftest.s >/dev/null; then
		      if grep '\.protected.*bar' conftest.s >/dev/null; then
			libc_cv_visibility_attribute=yes
		      fi
		    fi
		  fi
		  rm -f conftest.[cs]
		 ])
    if test $libc_cv_visibility_attribute = yes; then
      AC_DEFINE(HAVE_VISIBILITY_ATTRIBUTE)
    fi
  fi

  if test $libc_cv_visibility_attribute = yes; then
    AC_CACHE_CHECK(for broken __attribute__((visibility())),
		 libc_cv_broken_visibility_attribute,
		 [cat > conftest.c <<EOF
		  int foo (int x);
		  int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
		  int bar (int x) { return x; }
EOF
		  libc_cv_broken_visibility_attribute=yes
		  if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s1>&AS_MESSAGE_LOG_FD); then
changequote(,)dnl
		    if grep '\.hidden[ 	_]foo' conftest.s >/dev/null; then
changequote([,])dnl
		      libc_cv_broken_visibility_attribute=no
		    fi
		  fi
		  rm -f conftest.c conftest.s
		 ])
    if test $libc_cv_broken_visibility_attribute = yes; then
      AC_DEFINE(HAVE_BROKEN_VISIBILITY_ATTRIBUTE)
    fi
  fi

  AC_CACHE_CHECK(for broken __attribute__((alias())),
		 libc_cv_broken_alias_attribute,
		 [cat > conftest.c <<EOF
		  extern int foo (int x) __asm ("xyzzy");
		  int bar (int x) { return x; }
		  extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
		  extern int dfoo;
		  extern __typeof (dfoo) dfoo __asm ("abccb");
		  int dfoo = 1;
EOF
		  libc_cv_broken_alias_attribute=yes
		  if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
		    if grep 'xyzzy' conftest.s >/dev/null &&
		       grep 'abccb' conftest.s >/dev/null; then
		      libc_cv_broken_alias_attribute=no
		    fi
		  fi
		  rm -f conftest.c conftest.s
		 ])
  if test $libc_cv_broken_alias_attribute = yes; then
    AC_DEFINE(HAVE_BROKEN_ALIAS_ATTRIBUTE)
  fi

  if test $libc_cv_visibility_attribute = yes -a $gnu_ld = yes; then
    AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
		 libc_cv_have_sdata_section,
		 [echo "int i;" > conftest.c
		  libc_cv_have_sdata_section=no
		  if ${CC-cc} $LDFLAGS -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
		     | grep '\.sdata' >/dev/null; then
		    libc_cv_have_sdata_section=yes
		  fi
		  rm -f conftest.c conftest.so
		 ])
    if test $libc_cv_have_sdata_section = yes; then
      AC_DEFINE(HAVE_SDATA_SECTION)
    fi
  fi

  AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
		 libc_cv_initfinit_array, [dnl
  cat > conftest.c <<EOF
int _start (void) { return 0; }
int __start (void) { return 0; }
int foo (void) { return 1; }
int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -o conftest conftest.c
		     -static -nostartfiles -nostdlib 1>&AS_MESSAGE_LOG_FD])
  then
    if readelf -S conftest | fgrep INIT_ARRAY > /dev/null; then
      libc_cv_initfinit_array=yes
    else
      libc_cv_initfinit_array=no
    fi
  else
    libc_cv_initfinit_array=no
  fi
  rm -f conftest*])
  AC_SUBST(libc_cv_initfinit_array)
  if test $libc_cv_initfinit_array = yes; then
    AC_DEFINE(HAVE_INITFINI_ARRAY)
  fi

  AC_CACHE_CHECK(for libunwind-support in compiler,
		 libc_cv_cc_with_libunwind, [
    cat > conftest.c <<EOF
int main (void) { return 0; }
EOF
    if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
       conftest.c -v 2>&1 >/dev/null | grep -q " -lunwind "; then
      libc_cv_cc_with_libunwind=yes
    else
      libc_cv_cc_with_libunwind=no
    fi
    rm -f conftest*])
  AC_SUBST(libc_cv_cc_with_libunwind)
  if test $libc_cv_cc_with_libunwind = yes; then
    AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
  fi

  AC_CACHE_CHECK(for -z nodelete option,
		 libc_cv_z_nodelete, [dnl
  cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
		     -shared -o conftest.so conftest.c
		     -nostartfiles -nostdlib
		     -Wl,--enable-new-dtags,-z,nodelete 1>&AS_MESSAGE_LOG_FD])
  then
    libc_cv_z_nodelete=yes
  else
    libc_cv_z_nodelete=no
  fi
  rm -f conftest*])
  AC_SUBST(libc_cv_z_nodelete)

  AC_CACHE_CHECK(for -z nodlopen option,
		 libc_cv_z_nodlopen, [dnl
  cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
			-shared -o conftest.so conftest.c
			-nostartfiles -nostdlib
			-Wl,--enable-new-dtags,-z,nodlopen 1>&AS_MESSAGE_LOG_FD])
  then
    libc_cv_z_nodlopen=yes
  else
    libc_cv_z_nodlopen=no
  fi
  rm -f conftest*])
  AC_SUBST(libc_cv_z_nodlopen)

  AC_CACHE_CHECK(for -z initfirst option,
		 libc_cv_z_initfirst, [dnl
  cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
			-shared -o conftest.so conftest.c
			-nostartfiles -nostdlib
			-Wl,--enable-new-dtags,-z,initfirst 1>&AS_MESSAGE_LOG_FD])
  then
    libc_cv_z_initfirst=yes
  else
    libc_cv_z_initfirst=no
  fi
  rm -f conftest*])
  AC_SUBST(libc_cv_z_initfirst)

  AC_CACHE_CHECK(for -z relro option,
		 libc_cv_z_relro, [dnl
  libc_cv_z_relro=no
  if AC_TRY_COMMAND([${CC-cc} -v --help 2>&1|grep "z relro" 1>&AS_MESSAGE_LOG_FD])
  then
    if AC_TRY_COMMAND([${CC-cc} -Wl,--verbose 2>&1|grep DATA_SEGMENT_RELRO_END 1>&AS_MESSAGE_LOG_FD])
    then
      libc_cv_z_relro=yes
    fi
  fi])
  AC_SUBST(libc_cv_z_relro)
  if test $libc_cv_z_relro = yes; then
    AC_DEFINE(HAVE_Z_RELRO)
  fi

  AC_CACHE_CHECK(for -Bgroup option,
		 libc_cv_Bgroup, [dnl
  cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
			      -shared -o conftest.so conftest.c
			      -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
  then
    libc_cv_Bgroup=yes
  else
    libc_cv_Bgroup=no
  fi
  rm -f conftest*])
  AC_SUBST(libc_cv_Bgroup)

  AC_CACHE_CHECK(for libgcc_s suffix,
		 libc_cv_libgcc_s_suffix, [dnl
  cat > conftest.c <<EOF
int main (void) { return 0; }
EOF
changequote(,)dnl
  libc_cv_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
			   -shared -shared-libgcc -o conftest.so \
			   conftest.c -v 2>&1 >/dev/null \
			   | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
changequote([,])dnl
  rm -f conftest*])
  AC_SUBST(libc_cv_libgcc_s_suffix)

  AC_CACHE_CHECK(for --as-needed option,
		 libc_cv_as_needed, [dnl
  cat > conftest.c <<EOF
int main (void) { return 0; }
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
			      -shared -o conftest.so conftest.c
			      -lgcc_s$libc_cv_libgcc_s_suffix -Wl,--as-needed
			      -nostdlib 1>&AS_MESSAGE_LOG_FD])
  then
    libc_cv_as_needed=yes
  else
    libc_cv_as_needed=no
  fi
  rm -f conftest*])
  AC_SUBST(libc_cv_as_needed)

  ASFLAGS_config=
  AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
		 libc_cv_as_noexecstack, [dnl
  cat > conftest.c <<EOF
void foo (void) { }
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
		     -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
     && grep -q .note.GNU-stack conftest.s \
     && AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -Wa,--noexecstack
		       -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
  then
    libc_cv_as_noexecstack=yes
  else
    libc_cv_as_noexecstack=no
  fi
  rm -f conftest*])
  if test $libc_cv_as_noexecstack = yes; then
    ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
  fi
  AC_SUBST(ASFLAGS_config)

  AC_CACHE_CHECK(for -z combreloc,
		 libc_cv_z_combreloc, [dnl
  cat > conftest.c <<EOF
extern int bar (int);
extern int mumble;
int foo (void) { return bar (mumble); }
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
			-shared -o conftest.so conftest.c
			-nostdlib -nostartfiles
			-Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
  then
dnl The following test is a bit weak.  We must use a tool which can test
dnl cross-platform since the gcc used can be a cross compiler.  Without
dnl introducing new options this is not easily doable.  Instead use a tool
dnl which always is cross-platform: readelf.  To detect whether -z combreloc
dnl look for a section named .rel.dyn.
    if readelf -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
      libc_cv_z_combreloc=yes
    else
      libc_cv_z_combreloc=no
    fi
  else
    libc_cv_z_combreloc=no
  fi
  rm -f conftest*])
  if test "$libc_cv_z_combreloc" = yes; then
    AC_DEFINE(HAVE_Z_COMBRELOC)
  fi
  AC_SUBST(libc_cv_z_combreloc)

  AC_CACHE_CHECK(for -z execstack,
		 libc_cv_z_execstack, [dnl
  cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
			      -shared -o conftest.so conftest.c
			      -Wl,-z,execstack -nostdlib
			      1>&AS_MESSAGE_LOG_FD])
  then
    libc_cv_z_execstack=yes
  else
    libc_cv_z_execstack=no
  fi
  rm -f conftest*])
  AC_SUBST(libc_cv_z_execstack)

  AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
  cat > conftest.c <<EOF
int foo;
main () { return 0;}
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -pie -fpie
			      -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD])
  then
    libc_cv_fpie=yes
  else
    libc_cv_fpie=no
  fi
  rm -f conftest*])

  AC_SUBST(libc_cv_fpie)
fi

AC_CACHE_CHECK(for -fno-unit-at-a-time, libc_cv_fno_unit_at_a_time, [dnl
cat > conftest.c <<EOF
int foo;
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-unit-at-a-time
			    conftest.c 1>&AS_MESSAGE_LOG_FD])
then
  libc_cv_fno_unit_at_a_time=yes
else
  libc_cv_fno_unit_at_a_time=no
fi
rm -f conftest*])
if test $libc_cv_fno_unit_at_a_time = yes; then
  fno_unit_at_a_time=-fno-unit-at-a-time
fi
AC_SUBST(fno_unit_at_a_time)

if test $elf != yes; then
  AC_CACHE_CHECK(for .init and .fini sections, libc_cv_have_initfini,
		 [AC_TRY_COMPILE(, [asm (".section .init");
				    asm (".section .fini");
				    asm ("${libc_cv_dot_text}");],
				 libc_cv_have_initfini=yes,
				 libc_cv_have_initfini=no)])
  AC_SUBST(libc_cv_have_initfini)dnl
  if test $libc_cv_have_initfini = yes; then
    AC_DEFINE(HAVE_INITFINI)
  fi
fi

if test $elf = yes -a $gnu_ld = yes; then
  AC_CACHE_CHECK(whether cc puts quotes around section names,
		 libc_cv_have_section_quotes,
		 [cat > conftest.c <<EOF
		  static const int foo
		  __attribute__ ((section ("bar"))) = 1;
EOF
		  if ${CC-cc} -S conftest.c -o conftest.s; then
		    if grep '\.section.*"bar"' conftest.s >/dev/null; then
		      libc_cv_have_section_quotes=yes
		    else
		      libc_cv_have_section_quotes=no
		    fi
		  else
		    libc_cv_have_section_quotes=unknown
		  fi
		  rm -f conftest.[cs]
		 ])
  if test $libc_cv_have_section_quotes = yes; then
    AC_DEFINE(HAVE_SECTION_QUOTES)
  fi
fi

dnl AC_CHECK_ASM_UNDERSCORE([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
AC_DEFUN(AC_CHECK_ASM_UNDERSCORE,
[cat > conftest.$ac_ext <<EOF
dnl This sometimes fails to find confdefs.h, for some reason.
dnl [#]line $LINENO "[$]0"
[#]line $LINENO "configure"
#include "confdefs.h"
void underscore_test(void) {
return; }
EOF
if AC_TRY_EVAL(ac_compile); then
  if grep _underscore_test conftest* >/dev/null; then
    ifelse([$1], , :, [rm -f conftest*
    $1])
  else
    ifelse([$2], , , [rm -f conftest*
    $2])
  fi
else
  echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
  cat conftest.$ac_ext >&AS_MESSAGE_LOG_FD
  ifelse([$2], , , [rm -f conftest*
  $2])
fi
rm -f conftest*])

if test $elf = yes; then
  libc_cv_asm_underscores=no
else
  if test $ac_cv_prog_cc_works = yes; then
    AC_CACHE_CHECK(for _ prefix on C symbol names, libc_cv_asm_underscores,
		   [AC_TRY_LINK([asm ("_glibc_foobar:");], [glibc_foobar ();],
			        libc_cv_asm_underscores=yes,
			        libc_cv_asm_underscores=no)])
  else
    AC_CACHE_CHECK(for _ prefix on C symbol names, libc_cv_asm_underscores,
		   [AC_CHECK_ASM_UNDERSCORE(libc_cv_asm_underscores=yes,
				            libc_cv_asm_underscores=no)])
  fi
fi
if test $libc_cv_asm_underscores = no; then
  AC_DEFINE(NO_UNDERSCORES)
fi

if test $elf = yes; then
  libc_cv_weak_symbols=yes
fi

AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
	       [dnl
cat > conftest.s <<EOF
${libc_cv_dot_text}
${libc_cv_asm_global_directive} foo
foo:
.weak foo
.weak bar; bar = foo
EOF
if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
  libc_cv_asm_weak_directive=yes
else
  libc_cv_asm_weak_directive=no
fi
rm -f conftest*])

if test $libc_cv_asm_weak_directive = no; then
  AC_CACHE_CHECK(for assembler .weakext directive,
		 libc_cv_asm_weakext_directive,
		 [dnl
cat > conftest.s <<EOF
${libc_cv_dot_text}
${libc_cv_asm_global_directive} foo
foo:
.weakext bar foo
.weakext baz
${libc_cv_asm_global_directive} baz
baz:
EOF
  if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
    libc_cv_asm_weakext_directive=yes
  else
    libc_cv_asm_weakext_directive=no
  fi
  rm -f conftest*])

fi # no .weak

if test $libc_cv_asm_weak_directive = yes; then
  AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
elif test $libc_cv_asm_weakext_directive = yes; then
  AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
fi

AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
cat > conftest.s <<EOF
        .text
        .type   func,%function
func:
        .cfi_startproc
	.cfi_remember_state
	.cfi_rel_offset 1, 0
        .cfi_endproc
EOF
if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
  libc_cv_asm_cfi_directives=yes
else
  libc_cv_asm_cfi_directives=no
fi
rm -f conftest*])
if test $libc_cv_asm_cfi_directives = yes; then
  AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
fi

AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
cat > conftest.c <<\EOF
_start () {}
int __eh_pc;
__throw () {}
EOF
dnl No \ in command here because it ends up inside ''.
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
			    -nostdlib -nostartfiles -Wl,--no-whole-archive
			    -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
  libc_cv_ld_no_whole_archive=yes
else
  libc_cv_ld_no_whole_archive=no
fi
rm -f conftest*])
if test $libc_cv_ld_no_whole_archive = yes; then
  no_whole_archive=-Wl,--no-whole-archive
fi
AC_SUBST(no_whole_archive)dnl

AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
cat > conftest.c <<\EOF
_start () {}
int __eh_pc;
__throw () {}
EOF
dnl No \ in command here because it ends up inside ''.
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
			    -nostdlib -nostartfiles -fexceptions
			    -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
  libc_cv_gcc_exceptions=yes
else
  libc_cv_gcc_exceptions=no
fi
rm -f conftest*])
if test $libc_cv_gcc_exceptions = yes; then
  exceptions=-fexceptions
fi
AC_SUBST(exceptions)dnl

if test "$host_cpu" = powerpc ; then
# Check for a bug present in at least versions 2.8.x of GCC
# and versions 1.0.x of EGCS.
AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
	       libc_cv_c_asmcr0_bug='no',
	       libc_cv_c_asmcr0_bug='yes')])
if test "$libc_cv_c_asmcr0_bug" != 'no'; then
  AC_DEFINE(BROKEN_PPC_ASM_CR0)
fi
fi

AC_CACHE_CHECK(for DWARF2 unwind info support, libc_cv_gcc_dwarf2_unwind_info,
[cat > conftest.c <<EOF
#line $LINENO "configure"
static char *__EH_FRAME_BEGIN__;
_start ()
{
#ifdef CHECK__register_frame
  __register_frame (__EH_FRAME_BEGIN__);
  __deregister_frame (__EH_FRAME_BEGIN__);
#endif
#ifdef CHECK__register_frame_info
  __register_frame_info (__EH_FRAME_BEGIN__);
  __deregister_frame_info (__EH_FRAME_BEGIN__);
#endif
}
int __eh_pc;
__throw () {}
/* FIXME: this is fragile.  */
malloc () {}
strcmp () {}
strlen () {}
memcpy () {}
memset () {}
free () {}
abort () {}
__bzero () {}
dl_iterate_phdr () {}
EOF
libc_unwind_check="${CC-cc} $CFLAGS $CPPFLAGS -DCHECK__register_frame_info \
			    $LDFLAGS \
			    -nostdlib -nostartfiles -o conftest conftest.c \
			    -lgcc"
# Some platforms' specs put -lgcc first.  The second one doesn't hurt.
if AC_TRY_COMMAND([$libc_unwind_check >&AS_MESSAGE_LOG_FD]) ||
   AC_TRY_COMMAND([$libc_unwind_check -lgcc_eh -lgcc >&AS_MESSAGE_LOG_FD])
then
  if $libc_unwind_check -v 2>&1 >/dev/null \
     | grep -- --eh-frame-hdr 2>&1 >/dev/null; then
    libc_cv_gcc_dwarf2_unwind_info=no_registry_needed
  else
    libc_cv_gcc_dwarf2_unwind_info=static
  fi
else
  libc_cv_gcc_dwarf2_unwind_info=no
fi
if test $libc_cv_gcc_dwarf2_unwind_info = no; then
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -DCHECK__register_frame
			      $LDFLAGS -nostdlib -nostartfiles
			      -o conftest conftest.c -lgcc >&AS_MESSAGE_LOG_FD]); then
    libc_cv_gcc_dwarf2_unwind_info=yes
  else
    libc_cv_gcc_dwarf2_unwind_info=no
  fi
fi
rm -f conftest*])
case $libc_cv_gcc_dwarf2_unwind_info in
yes)
  AC_DEFINE(HAVE_DWARF2_UNWIND_INFO)
  ;;
static)
  AC_DEFINE(HAVE_DWARF2_UNWIND_INFO)
  AC_DEFINE(HAVE_DWARF2_UNWIND_INFO_STATIC)
  ;;
esac

dnl Check whether compiler understands __builtin_expect.
AC_CACHE_CHECK(for __builtin_expect, libc_cv_gcc_builtin_expect,
[cat > conftest.c <<EOF
#line $LINENO "configure"
int foo (int a)
{
  a = __builtin_expect (a, 10);
  return a == 10 ? 0 : 1;
}
EOF
dnl No \ in command here because it ends up inside ''.
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles
			    -o conftest conftest.c -lgcc >&AS_MESSAGE_LOG_FD]); then
  libc_cv_gcc_builtin_expect=yes
else
  libc_cv_gcc_builtin_expect=no
fi
rm -f conftest*])
if test "$libc_cv_gcc_builtin_expect" = yes; then
  AC_DEFINE(HAVE_BUILTIN_EXPECT)
fi

AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
cat > conftest.c <<\EOF
void zero (void *x)
{
  __builtin_memset (x, 0, 1000);
}
EOF
dnl
if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
then
  libc_cv_gcc_builtin_memset=no
else
  libc_cv_gcc_builtin_memset=yes
fi
rm -f conftest* ])
if test "$libc_cv_gcc_builtin_memset" = yes ; then
  AC_DEFINE(HAVE_BUILTIN_MEMSET)
fi

AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
cat > conftest.c <<\EOF
extern char *strstr (const char *, const char *) __asm ("my_strstr");
char *foo (const char *a, const char *b)
{
  return __builtin_strstr (a, b);
}
EOF
dnl
if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
then
  libc_cv_gcc_builtin_redirection=yes
else
  libc_cv_gcc_builtin_redirection=no
fi
rm -f conftest* ])
if test "$libc_cv_gcc_builtin_redirection" = yes ; then
  AC_DEFINE(HAVE_BUILTIN_REDIRECTION)
fi

dnl Check whether the compiler supports subtraction of local labels.
AC_CACHE_CHECK(for local label subtraction, libc_cv_gcc_subtract_local_labels,
[cat > conftest.c <<EOF
changequote(,)dnl
#line $LINENO "configure"
int foo (int a)
{
  static const int ar[] = { &&l1 - &&l1, &&l2 - &&l1 };
  void *p = &&l1 + ar[a];
  goto *p;
 l1:
  return 1;
 l2:
  return 2;
}
changequote([,])dnl
EOF
dnl No \ in command here because it ends up inside ''.
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles
			    -o conftest conftest.c -lgcc >&AS_MESSAGE_LOG_FD]); then
  libc_cv_gcc_subtract_local_labels=yes
else
  libc_cv_gcc_subtract_local_labels=no
fi
rm -f conftest*])
if test "$libc_cv_gcc_subtract_local_labels" = yes; then
  AC_DEFINE(HAVE_SUBTRACT_LOCAL_LABELS)
fi

dnl Check whether the compiler supports the __thread keyword.
if test "x$use__thread" != xno; then
  AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
  [cat > conftest.c <<\EOF
__thread int a = 42;
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
    libc_cv_gcc___thread=yes
  else
    libc_cv_gcc___thread=no
  fi
  rm -f conftest*])
  if test "$libc_cv_gcc___thread" = yes; then
    AC_DEFINE(HAVE___THREAD)
  fi
else
  libc_cv_gcc___thread=no
fi

if test "$libc_cv_gcc___thread" = yes; then
  dnl Check whether the compiler supports the tls_model attribute.
  AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
  cat > conftest.c <<\EOF
extern __thread int a __attribute__((tls_model ("initial-exec")));
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
    libc_cv_gcc_tls_model_attr=yes
  else
    libc_cv_gcc_tls_model_attr=no
  fi
  rm -f conftest*])
  if test "$libc_cv_gcc_tls_model_attr" = yes; then
    AC_DEFINE(HAVE_TLS_MODEL_ATTRIBUTE)
  fi
fi

dnl Check whether we have the gd library available.
AC_MSG_CHECKING(for libgd)
if test "$with_gd" != "no"; then
  old_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS $libgd_include"
  old_LDFLAGS="$LDFLAGS"
  LDFLAGS="$LDFLAGS $libgd_ldflags"
  old_LIBS="$LIBS"
  LIBS="$LIBS -lgd -lpng -lz -lm"
  AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
  CFLAGS="$old_CFLAGS"
  LDFLAGS="$old_LDFLAGS"
  LIBS="$old_LIBS"
else
  LIBGD=no
fi
AC_MSG_RESULT($LIBGD)
AC_SUBST(LIBGD)

# SELinux detection
if test x$with_selinux = xno ; then
  have_selinux=no;
else
  # See if we have the SELinux library
  AC_CHECK_LIB(selinux, is_selinux_enabled,
	       have_selinux=yes, have_selinux=no)
  # See if we have the SELinux header with the NSCD permissions in it.
  if test x$have_selinux = xyes ; then
    AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
    AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
		    [#ifdef NSCD__SHMEMHOST
		     return 0;
		     #else
		     #error NSCD__SHMEMHOST not defined
		     #endif],
		    have_selinux=yes, have_selinux=no)
    AC_MSG_RESULT($have_selinux)
  fi

  if test x$with_selinux = xyes ; then
    if test x$have_selinux = xno ; then
      AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
    fi
  fi
fi
# Check if we're building with SELinux support.
if test "x$have_selinux" = xyes; then
  AC_DEFINE(HAVE_SELINUX,1,[SELinux support])
fi
AC_SUBST(have_selinux)

dnl check for the size of 'long double'.
AC_CHECK_SIZEOF(long double, 0)
sizeof_long_double=$ac_cv_sizeof_long_double
AC_SUBST(sizeof_long_double)

### End of automated tests.
### Now run sysdeps configure fragments.

# They also can set these variables.
use_ldconfig=no
ldd_rewrite_script=no
libc_cv_sysconfdir=$sysconfdir
libc_cv_gcc_unwind_find_fde=no
libc_cv_idn=no

# Iterate over all the sysdep directories we will use, running their
# configure fragments, and looking for a uname implementation.
uname=
for dir in $sysnames; do
  case $dir in
    /*) dest=$dir ;;
    *)  dest=$srcdir/$dir ;;
  esac
  if test -r $dest/configure; then
    AC_MSG_RESULT(running configure fragment for $dir)
    . $dest/configure
  fi
[
  if test -z "$uname"; then
    if test -r $dest/uname.c ||
       test -r $dest/uname.S ||
       { test -r $dest/syscalls.list &&
	 grep '^uname[ 	]' $dest/syscalls.list >/dev/null; }; then
      uname=$dir
    fi
  fi
]dnl
done

if test x$libc_cv_gcc_unwind_find_fde = xyes; then
  AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
fi
AC_SUBST(libc_cv_gcc_unwind_find_fde)

# If we will use the generic uname implementation, we must figure out what
# it will say by examining the system, and write the results in config-name.h.
if test "$uname" = "sysdeps/generic"; then

changequote(,)dnl
  uname_sysname=`echo $config_os | sed 's/[0-9.]*$//'`
changequote([,])dnl
  if test $uname_sysname != $config_os; then
    config_release=`echo $config_os | sed s/$uname_sysname//`
  fi
dnl
AC_DEFUN(LIBC_KERNEL_ID, [dnl
    if test -r /vmunix; then
      kernel_id=`strings /vmunix | grep UNIX`
    elif test -r /dynix; then
      kernel_id=`strings /dynix | grep DYNIX`
    else
      kernel_id=
    fi
])dnl

  AC_CACHE_CHECK(OS release for uname, libc_cv_uname_release, [dnl
LIBC_KERNEL_ID
changequote(,)dnl
  kernel_release=`echo "$kernel_id" | sed 's/^[^0-9.]*\([0-9.]*\).*$/\1/'`
changequote([,])dnl
  if test x`echo "$config_release" | sed "s/^$kernel_release//"` \
	 != x$config_release; then
    # The configuration release is a substring of the kernel release.
    libc_cv_uname_release=$kernel_release
  elif test x$config_release != x; then
    libc_cv_uname_release=$config_release
  elif test x$kernel_release != x; then
    libc_cv_uname_release=$kernel_release
  else
    libc_cv_uname_release=unknown
  fi])
  uname_release="$libc_cv_uname_release"

  AC_CACHE_CHECK(OS version for uname, libc_cv_uname_version, [dnl
LIBC_KERNEL_ID
changequote(,)dnl
  kernel_version=`echo "$kernel_id" | sed 's/^[^#]*#\([0-9]*\).*$/\1/'`
changequote([,])dnl
  if test -n "$kernel_version"; then
    libc_cv_uname_version="$kernel_version"
  else
    libc_cv_uname_version=unknown
  fi])
  uname_version="$libc_cv_uname_version"

AC_SUBST(uname_sysname) AC_SUBST(uname_release) AC_SUBST(uname_version)dnl
  config_uname=config-name.h:config-name.in
else
  # For non-generic uname, we don't need to create config-name.h at all.
  config_uname=
fi

dnl This is tested by existing code and it's simpler to avoid changing it.
AC_DEFINE(USE_IN_LIBIO)

# Test for old glibc 2.0.x headers so that they can be removed properly
# Search only in includedir.
AC_MSG_CHECKING(for old glibc 2.0.x headers)
if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
then
  old_glibc_headers=yes
else
  old_glibc_headers=no
fi
AC_MSG_RESULT($old_glibc_headers)
if test ${old_glibc_headers} = yes; then
  AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
  AC_MSG_WARN(*** be removed.)
fi
AC_SUBST(old_glibc_headers)

AC_SUBST(libc_cv_slibdir)
AC_SUBST(libc_cv_localedir)
AC_SUBST(libc_cv_sysconfdir)
AC_SUBST(libc_cv_rootsbindir)
AC_SUBST(libc_cv_forced_unwind)

AC_SUBST(use_ldconfig)
AC_SUBST(ldd_rewrite_script)

AC_SUBST(gnu_ld) AC_SUBST(gnu_as) AC_SUBST(elf) AC_SUBST(xcoff)
if test $gnu_ld = yes; then
  AC_DEFINE(HAVE_GNU_LD)
fi
if test $gnu_as = yes; then
  AC_DEFINE(HAVE_GNU_AS)
fi
if test $elf = yes; then
  AC_DEFINE(HAVE_ELF)
fi
if test $xcoff = yes; then
  AC_DEFINE(HAVE_XCOFF)
fi

AC_SUBST(static)
AC_SUBST(shared)
if test $shared = default; then
  if test $gnu_ld = yes; then
    shared=$elf
  else
    # For now we do not assume shared libs are available.  In future more
    # tests might become available.
    shared=no
  fi
fi

if test x"$libc_cv_idn" = xyes; then
  AC_DEFINE(HAVE_LIBIDN)
fi

AC_CACHE_CHECK([whether -fPIC is default], pic_default,
[pic_default=yes
cat > conftest.c <<EOF
#if defined __PIC__ || defined __pic__ || defined PIC || defined pic
# error PIC is default.
#endif
EOF
if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
  pic_default=no
fi
rm -f conftest.*])
AC_SUBST(pic_default)

AC_SUBST(profile)
AC_SUBST(omitfp)
AC_SUBST(bounded)
AC_SUBST(static_nss)
AC_SUBST(nopic_initfini)

AC_SUBST(DEFINES)

dnl See sysdeps/mach/configure.in for this variable.
AC_SUBST(mach_interface_list)

if test "`(cd $srcdir; pwd)`" = "`pwd`"; then
  config_makefile=
else
  config_makefile=Makefile
fi

VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
AC_SUBST(VERSION)
AC_SUBST(RELEASE)

AC_CONFIG_FILES([config.make ${config_makefile} ${config_uname}])
AC_CONFIG_COMMANDS([default],[[
case $CONFIG_FILES in *config.make*)
echo "$config_vars" >> config.make;;
esac
test -d bits || mkdir bits]],[[config_vars='$config_vars']])
AC_OUTPUT