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 echo $ac_n "checking installed Linux kernel header files""... $ac_c" 1>&6
  11 echo "configure:12: checking installed Linux kernel header files" >&5
  12 if eval "test \"`echo '$''{'libc_cv_linux2010'+set}'`\" = set"; then
  13   echo $ac_n "(cached) $ac_c" 1>&6
  14 else
  15   cat > conftest.$ac_ext <<EOF
  16 #line 17 "configure"
  17 #include "confdefs.h"
  18 #include <linux/version.h>
  19 int main() {
  20 #if LINUX_VERSION_CODE <  (2 *65536+ 0 *256+ 10) /* 2.0.10 */
  21 eat flaming death
  22 #endif
  23 ; return 0; }
  24 EOF
  25 if { (eval echo configure:26: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
  26   rm -rf conftest*
  27   libc_cv_linux2010='2.0.10 or later'
  28 else
  29   echo "configure: failed program was:" >&5
  30   cat conftest.$ac_ext >&5
  31   rm -rf conftest*
  32   libc_cv_linux2010='TOO OLD!'
  33 fi
  34 rm -f conftest*
  35 fi
  36
  37 echo "$ac_t""$libc_cv_linux2010" 1>&6
  38 if test "$libc_cv_linux2010" != '2.0.10 or later'; then
  39   { echo "configure: error: GNU libc requires kernel header files from
  40 Linux 2.0.10 or later to be installed before configuring.
  41 The kernel header files are found usually in /usr/include/asm and
  42 /usr/include/linux; make sure these directories use files from
  43 Linux 2.0.10 or later.  This check uses <linux/version.h>, so
  44 make sure that file was built correctly when installing the kernel header
  45 files." 1>&2; exit 1; }
  46 fi
  47
  48 # The Linux filesystem standard prescribes where to place "essential"
  49 # files.  I.e., when the installation prefix is "/usr" we have to place
  50 # shared library objects and the configuration files on the root partition
  51 # in /lib and /etc.
  52 if test "$prefix" = "/usr"; then
  53   libc_cv_slibdir="/lib"
  54   libc_cv_sysconfdir="/etc"
  55   libc_cv_rootsbindir="/sbin"
  56 fi
  57
  58 # Under Linux the LinuxThreads and crypt add-on should be available.
  59 case $add_ons in
  60   # Both are available.  Good.
  61   *linuxthreads*crypt* | *crypt*linuxthreads*)
  62     message=
  63     ;;
  64   *linuxthreads*)
  65     message="\
  66 *** WARNING:
  67 *** Are you sure you do not want to use the \`crypt' add-on?"
  68     ;;
  69   *crypt*)
  70     message="\
  71 *** WARNING:
  72 *** Are you sure you do not want to use the \`linuxthread' add-on?"
  73     ;;
  74   *)
  75     message="\
  76 *** WARNING: Are you sure you do not want to use the \`linuxthreads'
  77 *** and \`crypt' add-ons?"
  78     ;;
  79 esac
  80
  81 if test "$message"; then
  82   if test $enable_sanity = yes; then
  83     echo "\
  84 *** You should not compile the GNU libc without the \`linuxthreads' and
  85 *** \`crypt' add-on.  Not using them risks to be incompatible with the
  86 *** libraries of other systems.  Consider getting the add-ons and restart
  87 *** the configuration.
  88 *** If you really mean to avoid those add-ons run configure again, now
  89 *** using the extra parameter \`--disable-sanity-checks'."
  90     exit 1
  91   else
  92     echo "$message"
  93   fi
  94 fi
  95
  96 # Check whether `ldconfig' sources are available.  This will go away as soon
  97 # as ldconfig is available in GNU libc.
  98 if test -f $srcdir/elf/ldconfig.c; then
  99   has_ldconfig=yes
 100 fi
 101
 102 # We need some extensions to the `ldd' script.
 103
 104 case "$machine" in
 105   i[3456]86* | m68k | sparc/sparc32)
 106     ldd_rewrite_script=../sysdeps/unix/sysv/linux/ldd-rewrite.sed
 107     ;;
 108   *)
 109     ;;
 110 esac
 111