sysdeps/unix/sysv/linux/configure.ac

   1 GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
   2 # Local configure fragment for sysdeps/unix/sysv/linux.
   3
   4 define([LIBC_LINUX_VERSION],[3.2.0])dnl
   5 if test -n "$sysheaders"; then
   6   OLD_CPPFLAGS=$CPPFLAGS
   7   CPPFLAGS="$CPPFLAGS $SYSINCLUDES"
   8 fi
   9 define([libc_cv_linuxVER], [libc_cv_linux]patsubst(LIBC_LINUX_VERSION,[\.]))dnl
  10 AC_CACHE_CHECK(installed Linux kernel header files, libc_cv_linuxVER, [dnl
  11 AC_TRY_COMPILE([#include <linux/version.h>
  12 #if !defined LINUX_VERSION_CODE || LINUX_VERSION_CODE < ]dnl
  13 patsubst(LIBC_LINUX_VERSION,[^\([^.]*\)\.\([^.]*\)\.\([^.]*\)$],dnl
  14 [ (\1 *65536+ \2 *256+ \3) /* \1.\2.\3 */])[
  15 # error kernel headers missing or too old
  16 #endif], [],
  17                [libc_cv_linuxVER='LIBC_LINUX_VERSION or later'],
  18                [libc_cv_linuxVER='missing or too old!'])])
  19 if test "$libc_cv_linuxVER" != 'LIBC_LINUX_VERSION or later'; then
  20   AC_MSG_ERROR([GNU libc requires kernel header files from
  21 Linux LIBC_LINUX_VERSION or later to be installed before configuring.
  22 The kernel header files are found usually in /usr/include/asm and
  23 /usr/include/linux; make sure these directories use files from
  24 Linux LIBC_LINUX_VERSION or later.  This check uses <linux/version.h>, so
  25 make sure that file was built correctly when installing the kernel header
  26 files.  To use kernel headers not from /usr/include/linux, use the
  27 configure option --with-headers.])
  28 fi
  29
  30 # If the user gave a minimal version number test whether the available
  31 # kernel headers are young enough.  Additionally we have minimal
  32 # kernel versions for some architectures.  If a previous configure fragment
  33 # set arch_minimum_kernel already, let that override our defaults here.
  34 # Note that we presume such a fragment has set libc_cv_gcc_unwind_find_fde
  35 # if appropriate too.
  36 test -n "$arch_minimum_kernel" || arch_minimum_kernel=3.2.0
  37 if test -n "$minimum_kernel"; then
  38   changequote(,)
  39   user_version=$((`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
  40   arch_version=$((`echo "$arch_minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
  41   changequote([,])
  42   if test $user_version -lt $arch_version; then
  43     AC_MSG_WARN([minimum kernel version reset to $arch_minimum_kernel])
  44     minimum_kernel=$arch_minimum_kernel
  45   fi
  46 else
  47   minimum_kernel=$arch_minimum_kernel
  48 fi
  49
  50 AC_MSG_CHECKING(for kernel header at least $minimum_kernel)
  51 changequote(,)dnl
  52 decnum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/(\1 * 65536 + \2 * 256 + \3)/'`;
  53 abinum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1,\2,\3/'`;
  54 changequote([,])dnl
  55 AC_TRY_COMPILE([#include <linux/version.h>
  56 #if LINUX_VERSION_CODE < $decnum
  57 # error kernel headers too old
  58 #endif], [], [libc_minimum_kernel=ok], [libc_minimum_kernel='too old!'])
  59 AC_MSG_RESULT($libc_minimum_kernel)
  60 if test "$libc_minimum_kernel" = ok; then
  61   AC_DEFINE_UNQUOTED(__LINUX_KERNEL_VERSION, $decnum)
  62   AC_DEFINE_UNQUOTED(__ABI_TAG_VERSION, $abinum)
  63 else
  64   AC_MSG_ERROR([*** The available kernel headers are older than the requested
  65 *** compatible kernel version])
  66 fi
  67
  68 if test -n "$sysheaders"; then
  69   CPPFLAGS=$OLD_CPPFLAGS
  70 fi
  71
  72 if test "$prefix" = "/usr/local" -o "$prefix" = "/usr/local/" -o "$prefix" = "NONE"; then
  73   if test $enable_sanity = yes; then
  74     echo "\
  75 *** On GNU/Linux systems the GNU C Library should not be installed into
  76 *** /usr/local since this might make your system totally unusable.
  77 *** We strongly advise to use a different prefix.  For details read the FAQ.
  78 *** If you really mean to do this, run configure again using the extra
  79 *** parameter \`--disable-sanity-checks'."
  80     exit 1
  81   else
  82     echo "\
  83 *** WARNING: Do you really want to install the GNU C Library into /usr/local?
  84 *** This might make your system totally unusable, for details read the FAQ."
  85   fi
  86 fi
  87
  88
  89 # One Linux we use ldconfig.
  90 use_ldconfig=yes
  91
  92 if test $host = $build; then
  93   # If $prefix/include/{net,scsi} are symlinks, make install will
  94   # clobber what they're linked to (probably a kernel tree).
  95   # test -L ought to work on all Linux boxes.
  96   if test "x$prefix" != xNONE; then
  97     ac_prefix=$prefix
  98   else
  99     ac_prefix=$ac_default_prefix
 100   fi
 101   AC_MSG_CHECKING([for symlinks in ${ac_prefix}/include])
 102   ac_message=
 103   if test -L ${ac_prefix}/include/net; then
 104     ac_message="$ac_message
 105    ${ac_prefix}/include/net is a symlink"
 106   fi
 107   if test -L ${ac_prefix}/include/scsi; then
 108     ac_message="$ac_message
 109    ${ac_prefix}/include/scsi is a symlink"
 110   fi
 111   if test -n "$ac_message"; then
 112     AC_MSG_ERROR([$ac_message
 113 \`make install' will destroy the target of the link(s).
 114 Delete the links and re-run configure, or better still, move the entire
 115 ${ac_prefix}/include directory out of the way.])
 116   else
 117     AC_MSG_RESULT(ok)
 118   fi
 119 fi
 120
 121 # We have inlined syscalls.
 122 AC_DEFINE(HAVE_INLINED_SYSCALLS)