configure

glibc 2.9,最新版的C语言库函数

    arch_minimum_kernel=2.4.19
    ;;
  m68k*)
    arch_minimum_kernel=2.0.10
    libc_cv_gcc_unwind_find_fde=yes
    ;;
  powerpc/powerpc32)
    libc_cv_gcc_unwind_find_fde=yes
    arch_minimum_kernel=2.0.10
    ;;
  powerpc/powerpc64)
    arch_minimum_kernel=2.4.21
    ;;
  s390/s390-32)
    libc_cv_gcc_unwind_find_fde=yes
    arch_minimum_kernel=2.2.10
    ;;
  s390/s390-64)
    libc_cv_gcc_unwind_find_fde=yes
    arch_minimum_kernel=2.4.0
    ;;
  sh*)
    arch_minimum_kernel=2.3.99
    libc_cv_gcc_unwind_find_fde=yes
    ;;
  sparc/sparc64*)
    libc_cv_gcc_unwind_find_fde=yes
    arch_minimum_kernel=2.4.21
    ;;
  sparc*)
    libc_cv_gcc_unwind_find_fde=yes
    arch_minimum_kernel=2.0.10
    ;;
  x86_64*)
    arch_minimum_kernel=2.4.0
    ;;
  *)
    arch_minimum_kernel=2.0.10
    ;;
esac
if test -n "$minimum_kernel"; then

  user_version=$((`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
  arch_version=$((`echo "$arch_minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))

  if test $user_version -lt $arch_version; then
    { echo "$as_me:$LINENO: WARNING: minimum kernel version reset to $arch_minimum_kernel" >&5
echo "$as_me: WARNING: minimum kernel version reset to $arch_minimum_kernel" >&2;}
    minimum_kernel=$arch_minimum_kernel
  fi
else
  if test $arch_minimum_kernel != '2.0.10'; then
    minimum_kernel=$arch_minimum_kernel
  fi
fi

if test -n "$minimum_kernel"; then
  { echo "$as_me:$LINENO: checking for kernel header at least $minimum_kernel" >&5
echo $ECHO_N "checking for kernel header at least $minimum_kernel... $ECHO_C" >&6; }
  decnum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/(\1 * 65536 + \2 * 256 + \3)/'`;
  abinum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1,\2,\3/'`;
  cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */
#include <linux/version.h>
#if LINUX_VERSION_CODE < $decnum
eat flaming death
#endif
_ACEOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  $EGREP "eat flaming death" >/dev/null 2>&1; then
  libc_minimum_kernel='too old!'
else
  libc_minimum_kernel=ok
fi
rm -f conftest*

  { echo "$as_me:$LINENO: result: $libc_minimum_kernel" >&5
echo "${ECHO_T}$libc_minimum_kernel" >&6; }
  if test "$libc_minimum_kernel" = ok; then
    cat >>confdefs.h <<_ACEOF
#define __LINUX_KERNEL_VERSION $decnum
_ACEOF

    cat >>confdefs.h <<_ACEOF
#define __ABI_TAG_VERSION $abinum
_ACEOF

  else
    { { echo "$as_me:$LINENO: error: *** The available kernel headers are older than the requested
*** compatible kernel version" >&5
echo "$as_me: error: *** The available kernel headers are older than the requested
*** compatible kernel version" >&2;}
   { (exit 1); exit 1; }; }
  fi
fi

# The result of the above test for the use of the FDE code is invalid if
# the user overrides the decision about the minimum ABI.
if test "$oldest_abi" != default && test "2.2.4" \< "$oldest_abi"; then
  libc_cv_gcc_unwind_find_fde=no
fi

if test -n "$sysheaders"; then
  CPPFLAGS=$OLD_CPPFLAGS
fi
# The Linux filesystem standard prescribes where to place "essential"
# files.  I.e., when the installation prefix is "/usr" we have to place
# shared library objects and the configuration files on the root partition
# in /lib and /etc.
case "$prefix" in
/usr | /usr/)
  # 64-bit libraries on bi-arch platforms go in /lib64 instead of /lib.
  # Allow earlier configure scripts to handle libc_cv_slibdir, libdir,
  # and libc_cv_localedir.
  test -n "$libc_cv_slibdir" || \
  case $machine in
  sparc/sparc64 | x86_64 | powerpc/powerpc64 | s390/s390-64)
    libc_cv_slibdir="/lib64"
    if test "$libdir" = '${exec_prefix}/lib'; then
      libdir='${exec_prefix}/lib64';
      # Locale data can be shared between 32bit and 64bit libraries
      libc_cv_localedir='${exec_prefix}/lib/locale'
    fi
    ;;
  *)
    libc_cv_slibdir="/lib"
    ;;
  esac
  # Allow the user to override the path with --sysconfdir
  if test $sysconfdir = '${prefix}/etc'; then
    libc_cv_sysconfdir=/etc
  else
    libc_cv_sysconfdir=$sysconfdir
   fi
  libc_cv_rootsbindir="/sbin"
  ;;
esac

# Under Linux the NPTL add-on should be available.
case $add_ons in
  # It is available.  Good.
  *nptl*)
    nptl_missing=
    ;;
  *)
    nptl_missing=yes
    ;;
esac

if test "$nptl_missing"; then
  if test $enable_sanity = yes; then
    echo "\
*** On GNU/Linux systems it is normal to compile GNU libc with the
*** \`nptl' add-on.  Without that, the library will be
*** incompatible with normal GNU/Linux systems.
*** If you really mean to not use this add-on, run configure again
*** using the extra parameter \`--disable-sanity-checks'."
    exit 1
  else
    echo "\
*** WARNING: Are you sure you do not want to use the \`nptl'
*** add-on?"
  fi
fi

if test "$prefix" = "/usr/local" -o "$prefix" = "/usr/local/" -o "$prefix" = "NONE"; then
  if test $enable_sanity = yes; then
    echo "\
*** On GNU/Linux systems the GNU C Library should not be installed into
*** /usr/local since this might make your system totally unusable.
*** We strongly advise to use a different prefix.  For details read the FAQ.
*** If you really mean to do this, run configure again using the extra
*** parameter \`--disable-sanity-checks'."
    exit 1
  else
    echo "\
*** WARNING: Do you really want to install the GNU C Library into /usr/local?
*** This might make your system totally unusable, for details read the FAQ."
  fi
fi


# One Linux we use ldconfig.
use_ldconfig=yes

# We need some extensions to the `ldd' script.

case "$machine" in
  i[3456]86* | m68*)
    ldd_rewrite_script=../sysdeps/unix/sysv/linux/ldd-rewrite.sed
    ;;
  ia64*)
    ldd_rewrite_script=../sysdeps/unix/sysv/linux/ia64/ldd-rewrite.sed
    ;;
  s390*)
    ldd_rewrite_script=../sysdeps/unix/sysv/linux/s390/ldd-rewrite.sed
    ;;
  sparc*)
    ldd_rewrite_script=../sysdeps/unix/sysv/linux/sparc/ldd-rewrite.sed
    ;;
  x86_64*)
    ldd_rewrite_script=../sysdeps/unix/sysv/linux/x86_64/ldd-rewrite.sed
    ;;
  powerpc*)
    ldd_rewrite_script=../sysdeps/unix/sysv/linux/powerpc/ldd-rewrite.sed
    ;;
  *)
    ;;
esac


if test $host = $build; then
  # If $prefix/include/{net,scsi} are symlinks, make install will
  # clobber what they're linked to (probably a kernel tree).
  # test -L ought to work on all Linux boxes.
  if test "x$prefix" != xNONE; then
    ac_prefix=$prefix
  else
    ac_prefix=$ac_default_prefix
  fi
  { echo "$as_me:$LINENO: checking for symlinks in ${ac_prefix}/include" >&5
echo $ECHO_N "checking for symlinks in ${ac_prefix}/include... $ECHO_C" >&6; }
  ac_message=
  if test -L ${ac_prefix}/include/net; then
    ac_message="$ac_message
   ${ac_prefix}/include/net is a symlink"
  fi
  if test -L ${ac_prefix}/include/scsi; then
    ac_message="$ac_message
   ${ac_prefix}/include/scsi is a symlink"
  fi
  if test -n "$ac_message"; then
    { { echo "$as_me:$LINENO: error: $ac_message
\`make install' will destroy the target of the link(s).
Delete the links and re-run configure, or better still, move the entire
${ac_prefix}/include directory out of the way." >&5
echo "$as_me: error: $ac_message
\`make install' will destroy the target of the link(s).
Delete the links and re-run configure, or better still, move the entire
${ac_prefix}/include directory out of the way." >&2;}
   { (exit 1); exit 1; }; }
  else
    { echo "$as_me:$LINENO: result: ok" >&5
echo "${ECHO_T}ok" >&6; }
  fi
fi

# We have inlined syscalls.
cat >>confdefs.h <<\_ACEOF
#define HAVE_INLINED_SYSCALLS 1
_ACEOF