config.if

   1 #! /dev/null
   2 # Don't call it directly. This shell script fragment is called to
   3 # determine:
   4 #
   5 #       1. libstcxx_interface: the interface name for libstdc++.
   6 #       2. cxx_interface: the interface name for c++.
   7 #       3. libc_interface: the interface name for libc.
   8 #
   9
  10 # Get the top level src dir.
  11 if [ -z "${topsrcdir}" -a -z "${top_srcdir}" ]
  12 then
  13   echo "Undefined top level src dir: topsrcdir and top_srcdir are empty" >&2
  14   exit 1
  15 fi
  16
  17 if [ -n "${topsrcdir}" ]
  18 then
  19   if_topsrcdir=${topsrcdir}
  20 else
  21   if_topsrcdir=${top_srcdir}
  22 fi
  23
  24 if [ -f ${if_topsrcdir}/libstdc++/Makefile.in ]; then
  25 # We check libstdc++ for libstdcxx_interface.
  26 libstdcxx_interface=`grep "^INTERFACE" ${if_topsrcdir}/libstdc++/Makefile.in | sed 's/INTERFACE[        ]*=[    ]*\(.*\)/\1/'`
  27 else
  28 libstdcxx_interface=
  29 fi
  30
  31 if [ -f ${if_topsrcdir}/gcc/cp/Makefile.in ]; then
  32 # We check gcc/cp for cxx_interface.
  33 cxx_interface=`grep "^INTERFACE" ${if_topsrcdir}/gcc/cp/Makefile.in | sed 's/INTERFACE[         ]*=[    ]*\(.*\)/\1/'`
  34 else
  35 cxx_interface=
  36 fi
  37
  38 # The trickiest part is libc_interface.
  39 if [ -z "${libc_interface}" ]
  40 then
  41   case ${target_os} in
  42   *linux*libc1*|*linux*libc5*)
  43     case ${target_alias} in
  44     *alpha*|*powerpc*)
  45       libc_interface=-libc5.9-
  46       ;;
  47     *)
  48       libc_interface=-libc5-
  49       ;;
  50     esac
  51     ;;
  52   *linux*gnu*)
  53     # We have to work harder to figure it out.
  54     if [ ${target_alias} = ${build_alias} ]
  55     then
  56       dummy=if$$
  57       cat >$dummy.c <<EOF
  58 #include <features.h>
  59 main(argc, argv)
  60      int argc;
  61      char *argv[];
  62 {
  63   printf("%d\n", __GLIBC_MINOR__);
  64   return 0;
  65 }
  66 EOF
  67       ${CC-cc} $dummy.c -o $dummy 2>/dev/null
  68       if [ "$?" = 0 ]
  69       then
  70         libc_interface=-libc6.`./$dummy`-
  71         rm -f $dummy.c $dummy
  72       else
  73         # It should never happen.
  74         echo "Cannot find the GNU C library minor version number." >&2
  75         rm -f $dummy.c $dummy
  76         exit 1
  77       fi
  78     else
  79       # Cross compiling. Assume glibc 2.1.
  80       libc_interface=-libc6.1-
  81     fi
  82     ;;
  83   *)
  84     libc_interface=-
  85     ;;
  86   esac
  87 fi