Fix #38: configue detects 32bit OCaml switch on 64bit host

configure

@@ -31,7 +31,7 @@ ocamldep='ocamldep'
 ocamldoc='ocamldoc'
 ccinc="$CPPFLAGS"
 cclib="$LDFLAGS"
-asopt=''
+asopt="$ASFLAGS"
 ccdef=''
 mlflags="$OCAMLFLAGS"
 mloptflags="$OCAMLOPTFLAGS"
@@ -64,6 +64,7 @@ where options include:
 Environment variables that affect configuration:
  CC C compiler to use (default: try gcc, then cc)
  CFLAGS extra flags to pass to the C compiler
+ ASFLAGS extra flags to pass to the assembler
  CPPFLAGS extra includes, e.g. -I/path/to/gmp/include
  LDFLAGS extra link flags, e.g. -L/path/to/gmp/lib
  OCAMLFLAGS extra flags to pass to the ocamlc Caml compiler
@@ -313,7 +314,15 @@ arch='none'
 case $host in
  x86_64-*linux-gnu|x86_64-kfreebsd-gnu)
  ccdef="-DZ_ELF -DZ_DOT_LABEL_PREFIX $ccdef"
- arch='x86_64';;
+ if test $wordsize = 32; then
+ # 32-bit OCaml on a 64-bit host
+ arch='i686'
+ ccopt="-m32 $ccopt"
+ asopt="-m32 $asopt"
+ else
+ arch='x86_64'
+ fi
+ ;;
  i486-*linux-gnu|i686-*linux-gnu|i486-kfreebsd-gnu)
  ccdef="-DZ_ELF -DZ_DOT_LABEL_PREFIX $ccdef"
  arch='i686';;