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added more.fs for people with old terminals.
WORDS and SEE now now respect the terminal size.
a lot of reordering in the Makefile, approaching the GNU standards.
factored NAME>STRING out of many words.
use AC_DECL_SYS_SIGLIST test in configure.in.
removed emitcounter (it was not used anyway).
SYSTEM now unpreps and repreps the terminal.
fixed byg in prims2x.fs.
added NEEDS, ?CSP, !CSP.
rewrote ALIAS?.

dnl Process this file with autoconf to produce a configure script.
AC_INIT(engine.c)
AC_CONFIG_HEADER(config.h)

AC_ARG_ENABLE(force-reg,
[  --enable-force-reg	  Use explicit register declarations if they appear in
			  the machine.h file. This can cause a good speedup,
			  but also incorrect code with some gcc versions on
			  some processors (default disabled).],

AC_DEFINE(FORCE_REG))
dnl this is not quite according to the autoconf manual, it causes a replacement
AC_ARG_ENABLE(direct-threaded,
[  --enable-direct-threaded	Force direct threading. This may not work on
				some machines and may cause slowdown on others.
				(default processor-dependent)],
AC_DEFINE(DIRECT_THREADED))
AC_ARG_ENABLE(indirect-threaded,
[  --enable-indirect-threaded	Force indirect threading. This can cause a
				slowdown on some machines.
				(default processor-dependent)],
AC_DEFINE(INDIRECT_THREADED))

AC_ARG_WITH(debug,
[  --with-debug     specifies option -g to compile with debug info (default)
   --without-debug  omits the -g switch and creates smaller images on
                    machines where "strip" has problems with gcc style
                    debugging informations.],
if test "$withval" = "yes"; then DEBUGFLAG=-g; fi)

CFLAGS=$CFLAGS

AC_PROG_CC

if test "$GCC" = "yes"
then
   echo "Fine, gcc is available"
else
   cat <<'EOF'
Gforth requires GCC-2.0 or higher (it uses GNU C extensions).
It does not work with other C compilers. Please install the GNU C compiler,
and try again (or search for a binary distribution for your platform).
EOF
   exit 1
fi

AC_SUBST(CC)
AC_SUBST(GCCLDFLAGS)
AC_SUBST(DEBUGFLAG)

dnl the following macro produces a warning with autoconf-2.1
AC_CHECK_SIZEOF(char *)
case "$ac_cv_sizeof_char_p" in
  2)
    wordsize=16
    ;;
  4)
    wordsize=32
    ;;
  8)
    wordsize=64
dnl    AC_CHECK_SIZEOF(long long)
dnl    if [ $ac_cv_sizeof_long_long != 16 ]
dnl    then
dnl       try the whole thing with -mlonglong128
dnl complain about C compiler and OS vendor
dnl    fi
    ;;
esac

#terminology is a bit unusual here: The host is the system on which
#gforth will run; the system on which configure will run is the `build'
AC_CANONICAL_HOST
case "$host_cpu" in
	hppa*)
		mach_h=hppa
		LIBOBJS="cache.o"
		LDFLAGS="-Xlinker -N"
		LIBS="-L/lib/pa1.1/"
		;;
	sparc*)
		mach_h=sparc
		;;
	i386|i486|i586)
		mach_h=386
		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem"
		#!! direct/indirect threading switch
		#!! -m486 flag
		;;
	mips*)
		mach_h=mips
		#link text and data segment into the same 256M region!
		GCCLDFLAGS="-Xlinker -T -Xlinker 10000000 -Xlinker -D -Xlinker 10400000"
		;;
	alpha*)
		mach_h=alpha
		echo Very Preliminary Support for Alpha!!!
		;;
	*)
		echo "No direct threading support for $host_cpu, using indirect threading."
		echo "Using a generic machine description. It will only work if char * AND"
		echo "long values have the same size and long long is twice as long."
		echo "I'll assume that C floats and doubles are represented by IEEE single and"
		echo "double numbers. If this is not so, SF@ etc. will not work correctly."
		echo "FLUSH-ICACHE will do nothing, so END-CODE may not work properly!"
		mach_h=32bit
esac
AC_SUBST(host)
AC_SUBST(ENGINE_FLAGS)

dnl Now a little support for DOS/DJGCC
AC_SUBST(MAKE_EXE)
MAKE_EXE=""

dnl copy commands for systems that don't have links
AC_SUBST(LINK_KERNL16L)
LINK_KERNL16L=""
AC_SUBST(LINK_KERNL16B)
LINK_KERNL16B=""
AC_SUBST(LINK_KERNL32L)
LINK_KERNL32L=""
AC_SUBST(LINK_KERNL32B)
LINK_KERNL32B=""
AC_SUBST(LINK_KERNL64L)
LINK_KERNL64L=""
AC_SUBST(LINK_KERNL64B)
LINK_KERNL64B=""

#if test $host_os=dos
#then
#  echo Configuring for DOS!!!
#  MAKE_EXE="coff2exe gforth"
#  LINK_KERNL32L='$(CP) kernl32l.fi kernal.fi'
#fi

dnl the following macro produces a warning with autoconf-2.1
AC_C_BIGENDIAN
AC_SUBST(KERNAL)
dnl ac_cv_c_bigendian is an undocumented variable of autoconf-2.1
if test $ac_cv_c_bigendian = yes; then
  bytesex=b
  KERNAL="kernl16b.fi kernl16l.fi kernl32b.fi kernl32l.fi kernl64b.fi kernl64l.fi"
else
  bytesex=l
  KERNAL="kernl16l.fi kernl16b.fi kernl32l.fi kernl32b.fi kernl64l.fi kernl64b.fi"
fi

dnl Checks for programs.
AC_PROG_LN_S
AC_PROG_INSTALL

dnl Checks for library functions
dnl This check is just for making later checks link with libm.
dnl using sin here is no good idea since it is built-into gcc and typechecked
AC_CHECK_LIB(m,asin)
AC_FUNC_MEMCMP
AC_REPLACE_FUNCS(memmove strtoul pow10 strerror strsignal)
AC_CHECK_FUNCS(sys_siglist)
AC_DECL_SYS_SIGLIST
AC_CHECK_FUNC(getopt_long,getopt_long="",getopt_long="getopt.o getopt1.o")
AC_SUBST(getopt_long)
AC_CHECK_FUNCS(rint expm1 log1p)
AC_REPLACE_FUNCS(ecvt)
dnl No check for select, because our replacement is no good under
dnl anything but DOS

kernal_fi=kernl${wordsize}${bytesex}.fi
AC_SUBST(kernal_fi)

AC_LINK_FILES(${mach_h}.h $kernal_fi,machine.h kernal.fi)
AC_OUTPUT(Makefile,echo timestamp > stamp-h)