config.if

   1 #! /dev/null
   2 # Don't call it directly. This shell script fragment is called to
   3 # determine:
   4 #
   5 #       1. libstcxx_incdir: the interface name for libstdc++.
   6 #       2. libc_interface: the interface name for libc.
   7 #
   8
   9 # Get the top level src dir.
  10 if [ -z "${topsrcdir}" -a -z "${top_srcdir}" ]
  11 then
  12   echo "Undefined top level src dir: topsrcdir and top_srcdir are empty" >&2
  13   exit 1
  14 fi
  15
  16 if [ -n "${topsrcdir}" ]
  17 then
  18   if_topsrcdir=${topsrcdir}
  19 else
  20   if_topsrcdir=${top_srcdir}
  21 fi
  22
  23 # Set libstdcxx_incdir.
  24 # This is the same as gcc/configure.in and libstdc++-v3/acinclude.m4.
  25 gcc_version_trigger=${if_topsrcdir}/gcc/version.c
  26 gcc_version_full=`grep version_string ${gcc_version_trigger} | sed -e 's/.*"\([^"]*\)".*/\1/'`
  27 gcc_version=`echo ${gcc_version_full} | sed -e 's/\([^ ]*\) .*/\1/'`
  28 libstdcxx_incdir=c++/${gcc_version}
  29
  30 # The trickiest part is libc_interface.
  31 if [ -z "${libc_interface}" ]
  32 then
  33   case ${target_os} in
  34   *linux*libc1*|*linux*libc5*)
  35     case ${target_alias} in
  36     *alpha*|*powerpc*)
  37       libc_interface=-libc5.9-
  38       ;;
  39     *)
  40       libc_interface=-libc5-
  41       ;;
  42     esac
  43     ;;
  44   *linux*gnu*)
  45     # We have to work harder to figure it out.
  46     if [ ${target_alias} = ${build_alias} ]
  47     then
  48       dummy=if$$
  49       cat >$dummy.c <<EOF
  50 #include <features.h>
  51 main(argc, argv)
  52      int argc;
  53      char *argv[];
  54 {
  55   printf("%d\n", __GLIBC_MINOR__);
  56   return 0;
  57 }
  58 EOF
  59       ${CC-cc} $dummy.c -o $dummy 2>/dev/null
  60       if [ "$?" = 0 ]
  61       then
  62         libc_interface=-libc6.`./$dummy`-
  63         rm -f $dummy.c $dummy
  64       else
  65         # It should never happen.
  66         echo "Cannot find the GNU C library minor version number." >&2
  67         rm -f $dummy.c $dummy
  68         exit 1
  69       fi
  70     else
  71       # Cross compiling. Assume glibc 2.1.
  72       libc_interface=-libc6.1-
  73     fi
  74     ;;
  75   *)
  76     libc_interface=-
  77     ;;
  78   esac
  79 fi