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 # We also use the new malloc by default.
   7 test $malloc = default && malloc=new-malloc
   8
   9 # Don't bother trying to generate any glue code to be compatible with the
  10 # existing system library, because we are the only system library.
  11 inhibit_glue=yes
  12
  13 echo $ac_n "checking installed Linux kernel header files""... $ac_c" 1>&6
  14 echo "configure:15: checking installed Linux kernel header files" >&5
  15 if eval "test \"`echo '$''{'libc_cv_linux2010'+set}'`\" = set"; then
  16   echo $ac_n "(cached) $ac_c" 1>&6
  17 else
  18   cat > conftest.$ac_ext <<EOF
  19 #line 20 "configure"
  20 #include "confdefs.h"
  21 #include <linux/version.h>
  22 int main() {
  23 #if LINUX_VERSION_CODE <  (2 *65536+ 0 *256+ 10) /* 2.0.10 */
  24 eat flaming death
  25 #endif
  26 ; return 0; }
  27 EOF
  28 if { (eval echo configure:29: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
  29   rm -rf conftest*
  30   libc_cv_linux2010='2.0.10 or later'
  31 else
  32   echo "configure: failed program was:" >&5
  33   cat conftest.$ac_ext >&5
  34   rm -rf conftest*
  35   libc_cv_linux2010='TOO OLD!'
  36 fi
  37 rm -f conftest*
  38 fi
  39
  40 echo "$ac_t""$libc_cv_linux2010" 1>&6
  41 if test "$libc_cv_linux2010" != '2.0.10 or later'; then
  42   { echo "configure: error: GNU libc requires kernel header files from
  43 Linux 2.0.10 or later to be installed before configuring.
  44 The kernel header files are found usually in /usr/include/asm and
  45 /usr/include/linux; make sure these directories use files from
  46 Linux 2.0.10 or later.  This check uses <linux/version.h>, so
  47 make sure that file was built correctly when installing the kernel header
  48 files." 1>&2; exit 1; }
  49 fi
  50
  51 # The Linux filesystem standard prescribes where to place "essential"
  52 # files.  I.e., when the installation prefix is "/usr" we have to place
  53 # shared library objects and the configuration files on the root partition
  54 # in /lib and /etc.
  55 if test "$prefix" = "/usr"; then
  56   libc_cv_slibdir="/lib"
  57   libc_cv_sysconfdir="/etc"
  58 fi
  59
  60 # Under Linux the LinuxThreads and crypt add-on should be available.
  61 case $add_ons in
  62   # Both are available.  Good.
  63   *linuxthreads*crypt* | *crypt*linuxthreads*)
  64     message=
  65     ;;
  66   *linuxthreads*)
  67     message="\
  68 *** WARNING:
  69 *** Are you sure you do not want to use the \`crypt' add-on?"
  70     ;;
  71   *crypt*)
  72     message="\
  73 *** WARNING:
  74 *** Are you sure you do not want to use the \`linuxthread' add-on?"
  75     ;;
  76   *)
  77     message="\
  78 *** WARNING: Are you sure you do not want to use the \`linuxthreads'
  79 *** and \`crypt' add-ons?"
  80     ;;
  81 esac
  82
  83 if test "$message"; then
  84   if test $enable_sanity = yes; then
  85     echo "\
  86 *** You should not compile the GNU libc without the \`linuxthreads' and
  87 *** \`crypt' add-on.  Not using them risks to be incompatible with the
  88 *** libraries of other systems.  Consider getting the add-ons and restart
  89 *** the configuration.
  90 *** If you really mean to avoid those add-ons run configure again, now
  91 *** using the extra parameter \`--disable-sanity-checks'."
  92     exit 1
  93   else
  94     echo "$message"
  95   fi
  96 fi