sysdeps/unix/sysv/linux/configure

   1  # Local configure fragment for sysdeps/unix/sysv/linux.
   2
   3 # Don't bother trying to generate any glue code to be compatible with the
   4 # existing system library, because we are the only system library.
   5 inhibit_glue=yes
   6
   7 if test -n "$sysheaders"; then
   8   OLD_CPPFLAGS=$CPPFLAGS
   9   CPPFLAGS="$CPPFLAGS $SYSINCLUDES"
  10 fi
  11 echo $ac_n "checking installed Linux kernel header files""... $ac_c" 1>&6
  12 echo "configure:13: checking installed Linux kernel header files" >&5
  13 if eval "test \"`echo '$''{'libc_cv_linux2010'+set}'`\" = set"; then
  14   echo $ac_n "(cached) $ac_c" 1>&6
  15 else
  16   cat > conftest.$ac_ext <<EOF
  17 #line 18 "configure"
  18 #include "confdefs.h"
  19 #include <linux/version.h>
  20 #if !defined LINUX_VERSION_CODE || LINUX_VERSION_CODE <  (2 *65536+ 0 *256+ 10) /* 2.0.10 */
  21 eat flaming death
  22 #endif
  23 EOF
  24 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  25   egrep "eat flaming death" >/dev/null 2>&1; then
  26   rm -rf conftest*
  27   libc_cv_linux2010='TOO OLD!'
  28 else
  29   rm -rf conftest*
  30   libc_cv_linux2010='2.0.10 or later'
  31 fi
  32 rm -f conftest*
  33
  34 fi
  35
  36 echo "$ac_t""$libc_cv_linux2010" 1>&6
  37 if test "$libc_cv_linux2010" != '2.0.10 or later'; then
  38   { echo "configure: error: GNU libc requires kernel header files from
  39 Linux 2.0.10 or later to be installed before configuring.
  40 The kernel header files are found usually in /usr/include/asm and
  41 /usr/include/linux; make sure these directories use files from
  42 Linux 2.0.10 or later.  This check uses <linux/version.h>, so
  43 make sure that file was built correctly when installing the kernel header
  44 files.  To use kernel headers not from /usr/include/linux, use the
  45 configure option --with-headers." 1>&2; exit 1; }
  46 fi
  47
  48 # If the user gave a minimal version number test whether the available
  49 # kernel headers are young enough.  Additionally we have minimal
  50 # kernel versions for some architectures.
  51 case "$machine" in
  52   alpha*)
  53     arch_minimum_kernel=2.1.100
  54     libc_cv_gcc_unwind_find_fde=yes
  55     ;;
  56   arm*)
  57     arch_minimum_kernel=2.0.10
  58     libc_cv_gcc_unwind_find_fde=yes
  59     ;;
  60   i386*)
  61     libc_cv_gcc_unwind_find_fde=yes
  62     arch_minimum_kernel=2.0.10
  63     ;;
  64   ia64*)
  65     arch_minimum_kernel=2.4.0
  66     ;;
  67   hppa*)
  68     arch_minimum_kernel=2.3.99
  69     ;;
  70   m68k*)
  71     arch_minimum_kernel=2.0.10
  72     libc_cv_gcc_unwind_find_fde=yes
  73     ;;
  74   mips*)
  75     arch_minimum_kernel=2.2.15
  76     libc_cv_gcc_unwind_find_fde=yes
  77     ;;
  78   powerpc*)
  79     libc_cv_gcc_unwind_find_fde=yes
  80     arch_minimum_kernel=2.0.10
  81     ;;
  82   s390/s390-32)
  83     libc_cv_gcc_unwind_find_fde=yes
  84     arch_minimum_kernel=2.2.10
  85     ;;
  86   s390/s390-64)
  87     libc_cv_gcc_unwind_find_fde=yes
  88     arch_minimum_kernel=2.4.0
  89     ;;
  90   sh*)
  91     arch_minimum_kernel=2.3.99
  92     libc_cv_gcc_unwind_find_fde=yes
  93     ;;
  94   sparc*)
  95     libc_cv_gcc_unwind_find_fde=yes
  96     arch_minimum_kernel=2.0.10
  97     ;;
  98   x86_64*)
  99     arch_minimum_kernel=2.4.0
 100     ;;
 101   *)
 102     arch_minimum_kernel=2.0.10
 103     ;;
 104 esac
 105 if test -n "$minimum_kernel"; then
 106
 107   user_version=$((`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
 108   arch_version=$((`echo "$arch_minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
 109
 110   if test $user_version -lt $arch_version; then
 111     echo "configure: warning: minimum kernel version reset to $arch_minimum_kernel" 1>&2
 112     minimum_kernel=$arch_minimum_kernel
 113   fi
 114 else
 115   if test $arch_minimum_kernel != '2.0.10'; then
 116     minimum_kernel=$arch_minimum_kernel
 117   fi
 118 fi
 119
 120 if test -n "$minimum_kernel"; then
 121   echo $ac_n "checking for kernel header at least $minimum_kernel""... $ac_c" 1>&6
 122 echo "configure:123: checking for kernel header at least $minimum_kernel" >&5
 123   decnum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/(\1 * 65536 + \2 * 256 + \3)/'`;
 124   abinum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1,\2,\3/'`;
 125   cat > conftest.$ac_ext <<EOF
 126 #line 127 "configure"
 127 #include "confdefs.h"
 128 #include <linux/version.h>
 129 #if LINUX_VERSION_CODE < $decnum
 130 eat flaming death
 131 #endif
 132 EOF
 133 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
 134   egrep "eat flaming death" >/dev/null 2>&1; then
 135   rm -rf conftest*
 136   libc_minimum_kernel='too old!'
 137 else
 138   rm -rf conftest*
 139   libc_minimum_kernel=ok
 140 fi
 141 rm -f conftest*
 142
 143   echo "$ac_t""$libc_minimum_kernel" 1>&6
 144   if test "$libc_minimum_kernel" = ok; then
 145     cat >> confdefs.h <<EOF
 146 #define __LINUX_KERNEL_VERSION $decnum
 147 EOF
 148
 149     cat >> confdefs.h <<EOF
 150 #define __ABI_TAG_VERSION $abinum
 151 EOF
 152
 153   else
 154     { echo "configure: error: *** The available kernel headers are older than the requested
 155 *** compatible kernel version" 1>&2; exit 1; }
 156   fi
 157 fi
 158
 159 # The result of the above test for the use of the FDE code is invalid if
 160 # the user overrides the decision about the minimum ABI.
 161 if test "$oldest_abi" != default && test "2.2.4" \< "$oldest_abi"; then
 162   libc_cv_gcc_unwind_find_fde=no
 163 fi
 164
 165 if test -n "$sysheaders"; then
 166   CPPFLAGS=$OLD_CPPFLAGS
 167 fi
 168 # The Linux filesystem standard prescribes where to place "essential"
 169 # files.  I.e., when the installation prefix is "/usr" we have to place
 170 # shared library objects and the configuration files on the root partition
 171 # in /lib and /etc.
 172 if test "$prefix" = "/usr" -o "$prefix" = "/usr/"; then
 173   # 64bit libraries on sparc go to /lib64 and not /lib
 174   if test "$machine" = "sparc/sparc64" -o "$machine" = "x86_64"; then
 175     libc_cv_slibdir="/lib64"
 176     if test "$libdir" = '${exec_prefix}/lib'; then
 177       libdir='${exec_prefix}/lib64';
 178       # Locale data can be shared between 32bit and 64bit libraries
 179       libc_cv_localedir='${exec_prefix}/lib/locale'
 180     fi
 181   else
 182     libc_cv_slibdir="/lib"
 183   fi
 184   # Allow the user to override the path with --sysconfdir
 185   if test $sysconfdir = '${prefix}/etc'; then
 186     libc_cv_sysconfdir=/etc
 187   else
 188     libc_cv_sysconfdir=$sysconfdir
 189    fi
 190   libc_cv_rootsbindir="/sbin"
 191 fi
 192
 193 # Under Linux the LinuxThreads add-on should be available.
 194 case $add_ons in
 195   # It is available.  Good.
 196   *linuxthreads*)
 197     linuxthreads_missing=
 198     ;;
 199   *)
 200     linuxthreads_missing=yes
 201     ;;
 202 esac
 203
 204 if test "$linuxthreads_missing"; then
 205   if test $enable_sanity = yes; then
 206     echo "\
 207 *** On GNU/Linux systems it is normal to compile GNU libc with the
 208 *** \`linuxthreads' add-on.  Without that, the library will be
 209 *** incompatible with normal GNU/Linux systems.
 210 *** If you really mean to not use this add-on, run configure again
 211 *** using the extra parameter \`--disable-sanity-checks'."
 212     exit 1
 213   else
 214     echo "\
 215 *** WARNING: Are you sure you do not want to use the \`linuxthreads'
 216 *** add-on?"
 217   fi
 218 fi
 219
 220 if test "$prefix" = "/usr/local" -o "$prefix" = "/usr/local/" -o "$prefix" = "NONE"; then
 221   if test $enable_sanity = yes; then
 222     echo "\
 223 *** On GNU/Linux systems the GNU C Library should not be installed into
 224 *** /usr/local since this might make your system totally unusable.
 225 *** We strongly advise to use a different prefix.  For details read the FAQ.
 226 *** If you really mean to do this, run configure again using the extra
 227 *** parameter \`--disable-sanity-checks'."
 228     exit 1
 229   else
 230     echo "\
 231 *** WARNING: Do you really want to install the GNU C Library into /usr/local?
 232 *** This might make your system totally unusable, for details read the FAQ."
 233   fi
 234 fi
 235
 236
 237 # One Linux we use ldconfig.
 238 use_ldconfig=yes
 239
 240 # We need some extensions to the `ldd' script.
 241
 242 case "$machine" in
 243   i[3456]86* | m68*)
 244     ldd_rewrite_script=../sysdeps/unix/sysv/linux/ldd-rewrite.sed
 245     ;;
 246   ia64*)
 247     ldd_rewrite_script=../sysdeps/unix/sysv/linux/ia64/ldd-rewrite.sed
 248     ;;
 249   s390*)
 250     ldd_rewrite_script=../sysdeps/unix/sysv/linux/s390/ldd-rewrite.sed
 251     ;;
 252   sparc*)
 253     ldd_rewrite_script=../sysdeps/unix/sysv/linux/sparc/ldd-rewrite.sed
 254     ;;
 255   x86_64*)
 256     ldd_rewrite_script=../sysdeps/unix/sysv/linux/x86_64/ldd-rewrite.sed
 257     ;;
 258   *)
 259     ;;
 260 esac
 261
 262
 263 if test $host = $build; then
 264   # If $prefix/include/{net,scsi} are symlinks, make install will
 265   # clobber what they're linked to (probably a kernel tree).
 266   # test -L ought to work on all Linux boxes.
 267   if test "x$prefix" != xNONE; then
 268     ac_prefix=$prefix
 269   else
 270     ac_prefix=$ac_default_prefix
 271   fi
 272   echo $ac_n "checking for symlinks in ${ac_prefix}/include""... $ac_c" 1>&6
 273 echo "configure:274: checking for symlinks in ${ac_prefix}/include" >&5
 274   ac_message=
 275   if test -L ${ac_prefix}/include/net; then
 276     ac_message="$ac_message
 277    ${ac_prefix}/include/net is a symlink"
 278   fi
 279   if test -L ${ac_prefix}/include/scsi; then
 280     ac_message="$ac_message
 281    ${ac_prefix}/include/scsi is a symlink"
 282   fi
 283   if test -n "$ac_message"; then
 284     { echo "configure: error: $ac_message
 285 \`make install' will destroy the target of the link(s).
 286 Delete the links and re-run configure, or better still, move the entire
 287 ${ac_prefix}/include directory out of the way." 1>&2; exit 1; }
 288   else
 289     echo "$ac_t""ok" 1>&6
 290   fi
 291 fi