AC_ARG_ENABLE([fpu], AS_HELP_STRING([--disable-fpu], [Disable floating-point]))
AS_IF([test "x$enable_fpu" != "xno"], [
  AC_DEFINE([RISCV_ENABLE_FPU],,[Define if floating-point instructions are supported])
])

AC_ARG_ENABLE([64bit], AS_HELP_STRING([--disable-64bit], [Disable 64-bit mode]))
AS_IF([test "x$enable_64bit" != "xno"], [
  AC_DEFINE([RISCV_ENABLE_64BIT],,[Define if 64-bit mode is supported])
])

AC_ARG_ENABLE([rvc], AS_HELP_STRING([--enable-rvc], [Enable instruction compression]))
AS_IF([test "x$enable_rvc" = "xyes"], [
  AC_DEFINE([RISCV_ENABLE_RVC],,[Define if instruction compression is supported])
])

AC_ARG_ENABLE([vec], AS_HELP_STRING([--disable-vec], [Disable vector processor]))
AS_IF([test "x$enable_vec" != "xno"], [
  AC_DEFINE([RISCV_ENABLE_VEC],,[Define if vector processor is supported])
])

libopc=`dirname \`which riscv-gcc\``/../`$ac_config_guess`/riscv/lib/libopcodes.a
AC_CHECK_FILES([$libopc],[have_libopcodes="yes"],[have_libopcodes="no"])

libbfd="/opt/local/lib/libbfd.dylib"
AC_SEARCH_LIBS([bfd_init],[bfd],[],[
    AC_CHECK_FILES([$libbfd], [libopc="$libopc $libbfd" incopc="/opt/local/include"], [have_libopcodes="no"])
])

AS_IF([test "$have_libopcodes" = "no"],[
  AC_MSG_WARN([Could not find opcodes library])
  AC_MSG_WARN([Build will not include disassembly support])
],[
  LIBS="$libopc $LIBS"
  INCDIRS="-I$incopc"
  AC_DEFINE([RISCV_HAVE_LIBOPCODES],,[Define if libopcodes exists])
])
AC_SUBST(INCDIRS)