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Added INSTALL.DOS
make DOS compile fool-proof (almost ;-)
Use autoconf macro to select GCC and abort if not available.

    1: dnl Process this file with autoconf to produce a configure script.
    2: AC_INIT(engine.c)
    3: 
    4: AC_ARG_ENABLE(force-reg,
    5: [  --enable-force-reg	  Use explicit register declarations if they appear in
    6: 			  the machine.h file. This can cause a good speedup,
    7: 			  but also incorrect code with some gcc versions on
    8: 			  some processors (default disabled).],
    9: 
   10: AC_DEFINE(FORCE_REG))
   11: dnl this is not quite according to the autoconf manual, it causes a replacement
   12: AC_ARG_ENABLE(direct-threaded,
   13: [  --enable-direct-threaded	Force direct threading. This may not work on
   14: 				some machines and may cause slowdown on others.
   15: 				(default processor-dependent)],
   16: AC_DEFINE(DIRECT_THREADED))
   17: AC_ARG_ENABLE(indirect-threaded,
   18: [  --enable-indirect-threaded	Force indirect threading. This can cause a
   19: 				slowdown on some machines.
   20: 				(default processor-dependent)],
   21: AC_DEFINE(INDIRECT_THREADED))
   22: 
   23: AC_ARG_WITH(debug,
   24: [  --with-debug     specifies option -g to compile with debug info (default)
   25:    --without-debug  omits the -g switch and creates smaller images on
   26:                     machines where "strip" has problems with gcc style
   27:                     debugging informations.],
   28: if test "$withval" = "yes"; then DEBUGFLAG=-g; fi)
   29: 
   30: AC_PROG_CC
   31: 
   32: if test "$GCC" = "yes"
   33: then
   34:    echo "Fine, gcc is available"
   35: else
   36:    cat <<'EOF'
   37: Gforth uses the GNU-C extensions for better performance. It does not work
   38: with other C compilers. Please install a new version of the GNU-C compiler, and
   39: try again.
   40: EOF
   41:    exit 1
   42: fi
   43: 
   44: AC_SUBST(CC)
   45: AC_SUBST(GCCLDFLAGS)
   46: AC_SUBST(DEBUGFLAG)
   47: 
   48: dnl the following macro produces a warning with autoconf-2.1
   49: AC_CHECK_SIZEOF(char *)
   50: case "$ac_cv_sizeof_char_p" in
   51:   2)
   52:     wordsize=16
   53:     ;;
   54:   4)
   55:     wordsize=32
   56:     ;;
   57:   8)
   58:     wordsize=64
   59: dnl    AC_CHECK_SIZEOF(long long)
   60: dnl    if [ $ac_cv_sizeof_long_long != 16 ]
   61: dnl    then
   62: dnl       try the whole thing with -mlonglong128
   63: dnl complain about C compiler and OS vendor
   64: dnl    fi
   65:     ;;
   66: esac
   67: 
   68: #terminology is a bit unusual here: The host is the system on which
   69: #gforth will run; the system on which configure will run is the `build'
   70: AC_CANONICAL_HOST
   71: case "$host_cpu" in
   72: 	hppa*)
   73: 		mach_h=hppa
   74: 		LIBOBJS="cache.o"
   75: 		LDFLAGS="-Xlinker -N"
   76: 		LIBS="-L/lib/pa1.1/"
   77: 		;;
   78: 	sparc*)
   79: 		mach_h=sparc
   80: 		;;
   81: 	i386|i486|i586)
   82: 		mach_h=386
   83: 		CFLAGS="-fomit-frame-pointer -fforce-addr -fforce-mem"
   84: 		#!! direct/indirect threading switch
   85: 		#!! -m486 flag
   86: 		;;
   87: 	m68*)
   88: 		mach_h=m68k
   89: 		;;
   90: 	mips*)
   91: 		mach_h=mips
   92: 		#link text and data segment into the same 256M region!
   93: 		GCCLDFLAGS="-Xlinker -T -Xlinker 10000000 -Xlinker -D -Xlinker 10400000"
   94: 		;;
   95: 	alpha*)
   96: 		mach_h=alpha
   97: 		echo Very Preliminary Support for Alpha!!!
   98: 		;;
   99: 	*)
  100: 		echo "No direct threading support for $host_cpu, using indirect threading."
  101: 		echo "Using a generic 32-bit machine description. It will only work if char * AND"
  102: 		echo "long values have 32 bits."
  103: 		echo "I'll assume that C floats and doubles are represented by IEEE single and"
  104: 		echo "double numbers. If this is not so, SF@ etc. will not work correctly."
  105: 		mach_h=32bit
  106: esac
  107: AC_SUBST(host)
  108: AC_SUBST(ENGINE_FLAGS)
  109: 
  110: dnl Now a little support for DOS/DJGCC
  111: AC_SUBST(MAKE_EXE)
  112: MAKE_EXE=""
  113: 
  114: dnl copy commands for systems that don't have links
  115: AC_SUBST(LINK_KERNL16L)
  116: LINK_KERNL16L=""
  117: AC_SUBST(LINK_KERNL16B)
  118: LINK_KERNL16B=""
  119: AC_SUBST(LINK_KERNL32L)
  120: LINK_KERNL32L=""
  121: AC_SUBST(LINK_KERNL32B)
  122: LINK_KERNL32B=""
  123: AC_SUBST(LINK_KERNL64L)
  124: LINK_KERNL64L=""
  125: AC_SUBST(LINK_KERNL64B)
  126: LINK_KERNL64B=""
  127: 
  128: #if test $host_os=dos
  129: #then
  130: #  echo Configuring for DOS!!!
  131: #  MAKE_EXE="coff2exe gforth"
  132: #  LINK_KERNL32L='$(CP) kernl32l.fi kernal.fi'
  133: #fi
  134: 
  135: dnl the following macro produces a warning with autoconf-2.1
  136: AC_C_BIGENDIAN
  137: AC_SUBST(KERNAL)
  138: dnl ac_cv_c_bigendian is an undocumented variable of autoconf-2.1
  139: if test $ac_cv_c_bigendian = yes; then
  140:   bytesex=b
  141:   KERNAL="kernl16b.fi kernl16l.fi kernl32b.fi kernl32l.fi kernl64b.fi kernl64l.fi"
  142: else
  143:   bytesex=l
  144:   KERNAL="kernl16l.fi kernl16b.fi kernl32l.fi kernl32b.fi kernl64l.fi kernl64b.fi"
  145: fi
  146: 
  147: dnl Checks for programs.
  148: AC_PROG_LN_S
  149: AC_PROG_INSTALL
  150: 
  151: dnl Checks for library functions
  152: dnl This check is just for making later checks link with libm.
  153: dnl using sin here is no good idea since it is built-into gcc and typechecked
  154: AC_CHECK_LIB(m,asin)
  155: AC_FUNC_MEMCMP
  156: AC_REPLACE_FUNCS(memmove strtoul pow10 strerror strsignal)
  157: AC_CHECK_FUNC(getopt_long,getopt_long="",getopt_long="getopt.o getopt1.o")
  158: AC_SUBST(getopt_long)
  159: AC_CHECK_FUNCS(rint expm1 log1p)
  160: AC_REPLACE_FUNCS(ecvt)
  161: dnl No check for select, because our replacement is no good under
  162: dnl anything but DOS
  163: 
  164: kernal_fi=kernl${wordsize}${bytesex}.fi
  165: AC_SUBST(kernal_fi)
  166: 
  167: AC_LINK_FILES(${mach_h}.h $kernal_fi,machine.h kernal.fi)
  168: AC_OUTPUT(Makefile)
  169: