GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.

# Local configure fragment for sysdeps/unix/sysv/linux.

define([LIBC_LINUX_VERSION],[3.2.0])dnl

if test -n "$sysheaders"; then

  OLD_CPPFLAGS=$CPPFLAGS

  CPPFLAGS="$CPPFLAGS $SYSINCLUDES"

fi

define([libc_cv_linuxVER], [libc_cv_linux]patsubst(LIBC_LINUX_VERSION,[\.]))dnl

AC_CACHE_CHECK(installed Linux kernel header files, libc_cv_linuxVER, [dnl

AC_TRY_COMPILE([#include <linux/version.h>

#if !defined LINUX_VERSION_CODE || LINUX_VERSION_CODE < ]dnl

patsubst(LIBC_LINUX_VERSION,[^\([^.]*\)\.\([^.]*\)\.\([^.]*\)$],dnl

[ (\1 *65536+ \2 *256+ \3) /* \1.\2.\3 */])[

# error kernel headers missing or too old

#endif], [],

	       [libc_cv_linuxVER='LIBC_LINUX_VERSION or later'],

	       [libc_cv_linuxVER='missing or too old!'])])

if test "$libc_cv_linuxVER" != 'LIBC_LINUX_VERSION or later'; then

  AC_MSG_ERROR([GNU libc requires kernel header files from

Linux LIBC_LINUX_VERSION or later to be installed before configuring.

The kernel header files are found usually in /usr/include/asm and

/usr/include/linux; make sure these directories use files from

Linux LIBC_LINUX_VERSION or later.  This check uses <linux/version.h>, so

make sure that file was built correctly when installing the kernel header

files.  To use kernel headers not from /usr/include/linux, use the

configure option --with-headers.])

fi

# If the user gave a minimal version number test whether the available

# kernel headers are young enough.  Additionally we have minimal

# kernel versions for some architectures.  If a previous configure fragment

# set arch_minimum_kernel already, let that override our defaults here.

# Note that we presume such a fragment has set libc_cv_gcc_unwind_find_fde

# if appropriate too.

test -n "$arch_minimum_kernel" || arch_minimum_kernel=3.2.0

if test -n "$minimum_kernel"; then

  changequote(,)

  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/'`))

  changequote([,])

  if test $user_version -lt $arch_version; then

    AC_MSG_WARN([minimum kernel version reset to $arch_minimum_kernel])

    minimum_kernel=$arch_minimum_kernel

  fi

else

  minimum_kernel=$arch_minimum_kernel

fi

AC_MSG_CHECKING(for kernel header at least $minimum_kernel)

changequote(,)dnl

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/'`;

changequote([,])dnl

AC_TRY_COMPILE([#include <linux/version.h>

#if LINUX_VERSION_CODE < $decnum

# error kernel headers too old

#endif], [], [libc_minimum_kernel=ok], [libc_minimum_kernel='too old!'])

AC_MSG_RESULT($libc_minimum_kernel)

if test "$libc_minimum_kernel" = ok; then

  AC_DEFINE_UNQUOTED(__LINUX_KERNEL_VERSION, $decnum)

  AC_DEFINE_UNQUOTED(__ABI_TAG_VERSION, $abinum)

else

  AC_MSG_ERROR([*** The available kernel headers are older than the requested

*** compatible kernel version])

fi

if test -n "$sysheaders"; then

  CPPFLAGS=$OLD_CPPFLAGS

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

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

  AC_MSG_CHECKING([for symlinks in ${ac_prefix}/include])

  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

    AC_MSG_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.])

  else

    AC_MSG_RESULT(ok)

  fi

fi

# We have inlined syscalls.

AC_DEFINE(HAVE_INLINED_SYSCALLS)