sysdeps/unix/sysv/linux/configure

   1  # Local configure fragment for sysdeps/unix/sysv/linux.
   2
   3 # On Linux, the default is to use libio instead of stdio.
   4 test $stdio = default && stdio=libio
   5
   6 # Don't bother trying to generate any glue code to be compatible with the
   7 # existing system library, because we are the only system library.
   8 inhibit_glue=yes
   9
  10 if test -n "$sysheaders"; then
  11   OLD_CFLAGS=$CFLAGS
  12   CFLAGS="$CFLAGS $SYSINCLUDES"
  13 fi
  14 echo $ac_n "checking installed Linux kernel header files""... $ac_c" 1>&6
  15 echo "configure:16: checking installed Linux kernel header files" >&5
  16 if eval "test \"\${libc_cv_linux2010+set}\" = set"; then
  17   echo $ac_n "(cached) $ac_c" 1>&6
  18 else
  19   cat > conftest.$ac_ext <<EOF
  20 #line 21 "configure"
  21 #include "confdefs.h"
  22 #include <linux/version.h>
  23 #if !defined LINUX_VERSION_CODE || LINUX_VERSION_CODE <  (2 *65536+ 0 *256+ 10) /* 2.0.10 */
  24 eat flaming death
  25 #endif
  26 EOF
  27 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  28   egrep "eat flaming death" >/dev/null 2>&1; then
  29   rm -rf conftest*
  30   libc_cv_linux2010='TOO OLD!'
  31 else
  32   rm -rf conftest*
  33   libc_cv_linux2010='2.0.10 or later'
  34 fi
  35 rm -f conftest*
  36
  37 fi
  38
  39 echo "$ac_t""$libc_cv_linux2010" 1>&6
  40 if test "$libc_cv_linux2010" != '2.0.10 or later'; then
  41   { echo "configure: error: GNU libc requires kernel header files from
  42 Linux 2.0.10 or later to be installed before configuring.
  43 The kernel header files are found usually in /usr/include/asm and
  44 /usr/include/linux; make sure these directories use files from
  45 Linux 2.0.10 or later.  This check uses <linux/version.h>, so
  46 make sure that file was built correctly when installing the kernel header
  47 files.  To use kernel headers not from /usr/include/linux, use the
  48 configure option --with-headers." 1>&2; exit 1; }
  49 fi
  50
  51 # If the user gave a minimal version number test whether the available
  52 # kernel headers are young enough.
  53 if test -n "$minimum_kernel"; then
  54   echo $ac_n "checking for kernel header at least $minimum_kernel""... $ac_c" 1>&6
  55 echo "configure:56: checking for kernel header at least $minimum_kernel" >&5
  56   decnum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/(\1 * 65536 + \2 * 256 + \3)/'`;
  57   cat > conftest.$ac_ext <<EOF
  58 #line 59 "configure"
  59 #include "confdefs.h"
  60 #include <linux/version.h>
  61 #if LINUX_VERSION_CODE < $decnum
  62 eat flaming death
  63 #endif
  64 EOF
  65 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  66   egrep "eat flaming death" >/dev/null 2>&1; then
  67   rm -rf conftest*
  68   libc_minimum_kernel='too old!'
  69 else
  70   rm -rf conftest*
  71   libc_minimum_kernel=ok
  72 fi
  73 rm -f conftest*
  74
  75   echo "$ac_t""$libc_minimum_kernel" 1>&6
  76   if test "$libc_minimum_kernel" = ok; then
  77     cat >> confdefs.h <<EOF
  78 #define __LINUX_KERNEL_VERSION $decnum
  79 EOF
  80
  81   else
  82     { echo "configure: error: *** The available kernel headers are older than the requested
  83 *** compatible kernel version" 1>&2; exit 1; }
  84   fi
  85 fi
  86
  87 if test -n "$sysheaders"; then
  88   CFLAGS=$OLD_CFLAGS
  89 fi
  90 # The Linux filesystem standard prescribes where to place "essential"
  91 # files.  I.e., when the installation prefix is "/usr" we have to place
  92 # shared library objects and the configuration files on the root partition
  93 # in /lib and /etc.
  94 if test "$prefix" = "/usr"; then
  95   # 64bit libraries on sparc go to /lib64 and not /lib
  96   if test "$machine" = "sparc/sparc64"; then
  97     libc_cv_slibdir="/lib64"
  98     if test "$libdir" = '${exec_prefix}/lib'; then
  99       libdir='${exec_prefix}/lib64';
 100     fi
 101   else
 102     libc_cv_slibdir="/lib"
 103   fi
 104   libc_cv_sysconfdir="/etc"
 105   libc_cv_rootsbindir="/sbin"
 106 fi
 107
 108 # Under Linux the LinuxThreads and crypt add-on should be available.
 109 case $add_ons in
 110   # Both are available.  Good.
 111   *linuxthreads*crypt* | *crypt*linuxthreads*)
 112     message=
 113     ;;
 114   *linuxthreads*)
 115     message="\
 116 *** WARNING:
 117 *** Are you sure you do not want to use the \`crypt' add-on?"
 118     ;;
 119   *crypt*)
 120     message="\
 121 *** WARNING:
 122 *** Are you sure you do not want to use the \`linuxthread' add-on?"
 123     ;;
 124   *)
 125     message="\
 126 *** WARNING: Are you sure you do not want to use the \`linuxthreads'
 127 *** and \`crypt' add-ons?"
 128     ;;
 129 esac
 130
 131 if test "$message"; then
 132   if test $enable_sanity = yes; then
 133     echo "\
 134 *** You should not compile the GNU libc without the \`linuxthreads' and
 135 *** \`crypt' add-on.  Not using them risks to be incompatible with the
 136 *** libraries of other systems.  Consider getting the add-ons and restart
 137 *** the configuration.
 138 *** If you really mean to avoid those add-ons run configure again, now
 139 *** using the extra parameter \`--disable-sanity-checks'."
 140     exit 1
 141   else
 142     echo "$message"
 143   fi
 144 fi
 145
 146 # One Linux we use ldconfig.
 147 use_ldconfig=yes
 148
 149 # We need some extensions to the `ldd' script.
 150
 151 case "$machine" in
 152   i[3456]86* | m68*)
 153     ldd_rewrite_script=../sysdeps/unix/sysv/linux/ldd-rewrite.sed
 154     ;;
 155   sparc*)
 156     ldd_rewrite_script=../sysdeps/unix/sysv/linux/sparc/ldd-rewrite.sed
 157     ;;
 158   *)
 159     ;;
 160 esac
 161
 162
 163 if test $host = $build; then
 164   # If $prefix/include/{net,scsi} are symlinks, make install will
 165   # clobber what they're linked to (probably a kernel tree).
 166   # test -L ought to work on all Linux boxes.
 167   if test "x$prefix" != xNONE; then
 168     ac_prefix=$prefix
 169   else
 170     ac_prefix=$ac_default_prefix
 171   fi
 172   echo $ac_n "checking for symlinks in ${ac_prefix}/include""... $ac_c" 1>&6
 173 echo "configure:174: checking for symlinks in ${ac_prefix}/include" >&5
 174   ac_message=
 175   if test -L ${ac_prefix}/include/net; then
 176     ac_message="$ac_message
 177    ${ac_prefix}/include/net is a symlink"
 178   fi
 179   if test -L ${ac_prefix}/include/scsi; then
 180     ac_message="$ac_message
 181    ${ac_prefix}/include/scsi is a symlink"
 182   fi
 183   if test -n "$ac_message"; then
 184     { echo "configure: error: $ac_message
 185 \`make install' will destroy the target of the link(s).
 186 Delete the links and re-run configure, or better still, move the entire
 187 ${ac_prefix}/include directory out of the way." 1>&2; exit 1; }
 188   else
 189     echo "$ac_t""ok" 1>&6
 190   fi
 191 fi