sysdeps/unix/sysv/linux/configure.in

   1 sinclude(./aclocal.m4)dnl Autoconf lossage
   2 GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
   3 # Local configure fragment for sysdeps/unix/sysv/linux.
   4
   5 # On Linux, the default is to use libio instead of stdio.
   6 test $stdio = default && stdio=libio
   7
   8 # We also use the new malloc by default.
   9 test $malloc = default && malloc=new-malloc
  10
  11 # Don't bother trying to generate any glue code to be compatible with the
  12 # existing system library, because we are the only system library.
  13 inhibit_glue=yes
  14
  15 define([LIBC_LINUX_VERSION],[2.0.10])dnl
  16 define([libc_cv_linuxVER], [libc_cv_linux]patsubst(LIBC_LINUX_VERSION,[\.]))dnl
  17 AC_CACHE_CHECK(installed Linux kernel header files, libc_cv_linuxVER, [dnl
  18 AC_TRY_COMPILE([#include <linux/version.h>],
  19 [#if LINUX_VERSION_CODE < ]dnl
  20 patsubst(LIBC_LINUX_VERSION,[^\([^.]*\)\.\([^.]*\)\.\([^.]*\)$],dnl
  21 [ (\1 *65536+ \2 *256+ \3) /* \1.\2.\3 */])[
  22 eat flaming death
  23 #endif],
  24                libc_cv_linuxVER='LIBC_LINUX_VERSION or later',
  25                libc_cv_linuxVER='TOO OLD!')])
  26 if test "$libc_cv_linuxVER" != 'LIBC_LINUX_VERSION or later'; then
  27   AC_MSG_ERROR([GNU libc requires kernel header files from
  28 Linux LIBC_LINUX_VERSION or later to be installed before configuring.
  29 The kernel header files are found usually in /usr/include/asm and
  30 /usr/include/linux; make sure these directories use files from
  31 Linux LIBC_LINUX_VERSION or later.  This check uses <linux/version.h>, so
  32 make sure that file was built correctly when installing the kernel header
  33 files.])
  34 fi
  35
  36 # The Linux filesystem standard prescribes where to place "essential"
  37 # files.  I.e., when the installation prefix is "/usr" we have to place
  38 # shared library objects and the configuration files on the root partition
  39 # in /lib and /etc.
  40 if test "$prefix" = "/usr"; then
  41   libc_cv_slibdir="/lib"
  42   libc_cv_sysconfdir="/etc"
  43   libc_cv_rootsbindir="/sbin"
  44 fi
  45
  46 # Under Linux the LinuxThreads and crypt add-on should be available.
  47 case $add_ons in
  48   # Both are available.  Good.
  49   *linuxthreads*crypt* | *crypt*linuxthreads*)
  50     message=
  51     ;;
  52   *linuxthreads*)
  53     message="\
  54 *** WARNING:
  55 *** Are you sure you do not want to use the \`crypt' add-on?"
  56     ;;
  57   *crypt*)
  58     message="\
  59 *** WARNING:
  60 *** Are you sure you do not want to use the \`linuxthread' add-on?"
  61     ;;
  62   *)
  63     message="\
  64 *** WARNING: Are you sure you do not want to use the \`linuxthreads'
  65 *** and \`crypt' add-ons?"
  66     ;;
  67 esac
  68
  69 if test "$message"; then
  70   if test $enable_sanity = yes; then
  71     echo "\
  72 *** You should not compile the GNU libc without the \`linuxthreads' and
  73 *** \`crypt' add-on.  Not using them risks to be incompatible with the
  74 *** libraries of other systems.  Consider getting the add-ons and restart
  75 *** the configuration.
  76 *** If you really mean to avoid those add-ons run configure again, now
  77 *** using the extra parameter \`--disable-sanity-checks'."
  78     exit 1
  79   else
  80     echo "$message"
  81   fi
  82 fi
  83
  84 # Check whether `ldconfig' sources are available.  This will go away as soon
  85 # as ldconfig is available in GNU libc.
  86 if test -f $srcdir/elf/ldconfig.c; then
  87   has_ldconfig=yes
  88 fi