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=${top_srcdir}
  22 fi
  23
  24 libstdcxx_srcdir=${if_topsrcdir}/libstdc++-v3
  25 # We check libstdc++-v3/configure.in for libstdcxx_interface.
  26 libstdcxx_interface=`grep "^INTERFACE" ${libstdcxx_srcdir}/configure.in | sed 's/INTERFACE[     ]*=[    ]*\(.*\)/\1/'`
  27 libstdcxx_incdir=g++-${libstdcxx_interface}
  28 # Used to version libstdc++ shared libraries
  29 cxx_interface=2
  30
  31 # The trickiest part is libc_interface.
  32 if [ -z "${libc_interface}" ]
  33 then
  34   case ${target_os} in
  35   *linux*libc1*|*linux*libc5*)
  36     case ${target_alias} in
  37     *alpha*|*powerpc*)
  38       libc_interface=-libc5.9-
  39       ;;
  40     *)
  41       libc_interface=-libc5-
  42       ;;
  43     esac
  44     ;;
  45   *linux*gnu*)
  46     # We have to work harder to figure it out.
  47     if [ ${target_alias} = ${build_alias} ]
  48     then
  49       dummy=if$$
  50       cat >$dummy.c <<EOF
  51 #include <features.h>
  52 main(argc, argv)
  53      int argc;
  54      char *argv[];
  55 {
  56   printf("%d\n", __GLIBC_MINOR__);
  57   return 0;
  58 }
  59 EOF
  60       ${CC-cc} $dummy.c -o $dummy 2>/dev/null
  61       if [ "$?" = 0 ]
  62       then
  63         libc_interface=-libc6.`./$dummy`-
  64         rm -f $dummy.c $dummy
  65       else
  66         # It should never happen.
  67         echo "Cannot find the GNU C library minor version number." >&2
  68         rm -f $dummy.c $dummy
  69         exit 1
  70       fi
  71     else
  72       # Cross compiling. Assume glibc 2.1.
  73       libc_interface=-libc6.1-
  74     fi
  75     ;;
  76   *)
  77     libc_interface=-
  78     ;;
  79   esac
  80 fi