Support -model [arg] with Tru64 UNIX C++ compiler

[Albert Chin]

With the Tru64 UNIX C++ compiler, -model [arg] selects the layout of
C++ classes, name mangling, and exception handling. It is important to
preserve this when compiling and linking.

Patch against HEAD.

-- 
albert chin (address@hidden)

-- snip snip
2004-12-07  Albert Chin-A-Young  <address@hidden>

        * config/ltmain.m4sh: Preserve -model [arg] option, used
        with the Tru64 UNIX C++ compiler. This option selects the
        layout of C++ classes, name mangling, and exception handling.

Index: config/ltmain.m4sh
===================================================================
RCS file: /cvsroot/libtool/libtool/config/ltmain.m4sh,v
retrieving revision 1.30
diff -u -3 -p -r1.30 ltmain.m4sh
--- config/ltmain.m4sh  2 Dec 2004 16:40:55 -0000       1.30
+++ config/ltmain.m4sh  8 Dec 2004 03:56:38 -0000
@@ -2629,6 +2629,16 @@ func_mode_link ()
        continue
        ;;
 
+      # Tru64 UNIX uses -model [arg] to determine the layout of C++
+      # classes, name mangling, and exception handling.
+      -model)
+       compile_command="$compile_command $arg"
+       compiler_flags="$compiler_flags $arg"
+       finalize_command="$finalize_command $arg"
+       prev=xcompiler
+       continue
+       ;;
+
       -mt|-mthreads|-kthread|-Kthread|-pthread|-pthreads|--thread-safe)
        deplibs="$deplibs $arg"
        continue