--- gforth/configure.in	1995/03/20 18:16:23	1.10
+++ gforth/configure.in	1996/02/13 11:12:15	1.20
@@ -1,5 +1,25 @@
 dnl Process this file with autoconf to produce a configure script.
+
+#Copyright (C) 1995,1996 Free Software Foundation, Inc.
+
+#This file is part of Gforth.
+
+#Gforth is free software; you can redistribute it and/or
+#modify it under the terms of the GNU General Public License
+#as published by the Free Software Foundation; either version 2
+#of the License, or (at your option) any later version.
+
+#This program is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.#See the
+#GNU General Public License for more details.
+
+#You should have received a copy of the GNU General Public License
+#along with this program; if not, write to the Free Software
+#Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
 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
@@ -27,7 +47,23 @@ AC_ARG_WITH(debug,
                     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)
 
@@ -42,15 +78,25 @@ case "$ac_cv_sizeof_char_p" in
     ;;
   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 -mlonlong128
-dnl complain about C compiler and OS vendor
-dnl    fi
     ;;
 esac
 
+AC_CHECK_INT_TYPE(sizeof(char *),cell,long)
+if test $ac_cv_int_type_cell != int; then
+	echo "So, sizeof(pointer)!=sizeof(int); looks like a DOS C compiler to me."
+	echo "Since you don't have a proper C on this machine, that's one more reason"
+	echo "to use Forth;-)"
+fi
+AC_CHECK_INT_TYPE(2*sizeof(char *),double cell,long long)
+if test $ac_cv_int_type_double_cell = none; then
+	echo "Emulating double-cell arithmetic. This may be slow."
+	echo "If you find this unacceptable, ask the GCC maintainers to provide proper"
+	echo 'long longs for your machine (the GCC manual states that they \"are twice as'
+	echo "long as \`long int\'\")."
+	LIBOBJS="$LIBOBJS dblsub.o"
+	AC_DEFINE(BUGGY_LONG_LONG)
+fi
+
 #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
@@ -66,13 +112,10 @@ case "$host_cpu" in
 		;;
 	i386|i486|i586)
 		mach_h=386
-		CFLAGS="-fforce-mem -fforce-addr -fomit-frame-pointer"
+		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem"
 		#!! direct/indirect threading switch
 		#!! -m486 flag
 		;;
-	m68*)
-		mach_h=m68k
-		;;
 	mips*)
 		mach_h=mips
 		#link text and data segment into the same 256M region!
@@ -80,17 +123,17 @@ case "$host_cpu" in
 		;;
 	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 32-bit machine description. It will only work if char * AND"
-		echo "long values have 32 bits."
+		echo "Using a generic machine description."
 		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)
@@ -114,7 +157,7 @@ LINK_KERNL64B=""
 #then
 #  echo Configuring for DOS!!!
 #  MAKE_EXE="coff2exe gforth"
-#  LINK_KERNL32L='$(CP) kernl32l.fi gforth.fi'
+#  LINK_KERNL32L='$(CP) kernl32l.fi kernal.fi'
 #fi
 
 dnl the following macro produces a warning with autoconf-2.1
@@ -138,17 +181,19 @@ dnl This check is just for making later
 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)
+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 pow10)
+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
 
-gforth_fi=kernl${wordsize}${bytesex}.fi
-AC_SUBST(gforth_fi)
+kernal_fi=kernl${wordsize}${bytesex}.fi
+AC_SUBST(kernal_fi)
 
-AC_LINK_FILES(${mach_h}.h $gforth_fi,machine.h gforth.fi)
-AC_OUTPUT(Makefile)
+AC_LINK_FILES(${mach_h}.h $kernal_fi,machine.h kernal.fi)
+AC_OUTPUT(Makefile,echo timestamp > stamp-h)