multilib fixes for libjava

[Andrew Haley]

Jack Howarth writes:

 >    I think a working set of patches for building multilib 
 > libjava on Darwin PPC with a G4. However I have one issue
 > that we need to solve. Currently...
 > 
 >    if test x"$build" = x"$host"; then
 >      AC_CHECK_FILES(/proc/self/exe, [
 >        AC_DEFINE(HAVE_PROC_SELF_EXE, 1, [Define if you have /proc/self/exe])])
 >    else
 >      case $host in
 >      *-linux*)
 >        AC_DEFINE(HAVE_PROC_SELF_EXE, 1, [Define if you have /proc/self/exe])
 >        ;;
 >      esac
 >    fi
 > 
 > in configure.ac fails on a G4 with the error...
 > 
 > checking for /proc/self/exe... configure: error: cannot check for file existence when cross compiling
 > 
 > Mike Stump suggests we try...
 > 
 >   if test x"$cross_compiling" = x"no"; then
 >      AC_CHECK_FILES(/proc/self/exe, [
 >        AC_DEFINE(HAVE_PROC_SELF_EXE, 1, [Define if you have /proc/self/exe])])
 >    else
 >      case $host in
 >      *-linux*)
 >        AC_DEFINE(HAVE_PROC_SELF_EXE, 1, [Define if you have /proc/self/exe])
 >        ;;
 >      esac
 >    fi
 > 
 > ...instead. Do you have any opinions on that?

I think that's the test that AC_CHECK_FILE is using, so that should be
fine.

Andrew.