File: configure.in

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dnl Process this file with autoconf to produce a configure script.

#Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006,2007,2008 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 3
#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, see http://www.gnu.org/licenses/.


dnl We use some automake macros here,
dnl but don't use automake for creating Makefile.in
AC_INIT([gforth],[0.7.3],[https://savannah.gnu.org/bugs/?func=addbug&group=gforth])
AC_PREREQ(2.54)
#snapshots have numbers major.minor.release-YYYYMMDD
#note that lexicographic ordering must be heeded.
#I.e., 0.4.1-YYYYMMDD must not exist before 0.4.1!
UPDATED="June 14, 2014"
AC_SUBST(UPDATED)
AC_CONFIG_HEADERS(engine/config.h)

#remnants from having ltdl as convenience library
LTDLDEPS=""
LTDLINCL=""
LIBLTDL=""
LTDL_LDLIBS=""
AC_SUBST(LTDLDEPS)
AC_SUBST(LTDLINCL)
AC_SUBST(LIBLTDL)
AC_SUBST(LTDL_LDLIBS)

#suppress the "-g -O2" default
test "$CFLAGS" || CFLAGS=-O2

AC_ARG_ENABLE(force-cdiv,
	AC_HELP_STRING([--enable-force-cdiv],
		       [  Use the native C division - symmetric - instead of
		          floored division (default disabled).]),
	,enable_force_cdiv=no)
test "$enable_force_cdiv" = "no"||
  AC_DEFINE(FORCE_CDIV,,[Define if you want to use explicit symmetric division for better performance])

AC_SUBST(PROFEXES)
AC_SUBST(PROFOBJS)
AC_ARG_ENABLE(prof,
	AC_HELP_STRING([--enable-prof],
			[ Build gforth-prof, which outputs frequently occurring
                          sequences of primitives.]),
	,enable_prof=no)
if test "$enable_prof" != "no"; then
  PROFEXES='gforth-prof$(OPT)$(EXE)'; PROFOBJS='engine-prof$(OPT).o main-prof$(OPT).o profile$(OPT).o'
fi

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

NO_CHECK=""
COMMENT="#"

AC_ARG_WITH(check,
[  --with-check		  enables sanity check during build (default)
  --without-check	  disables sanity check during build],
if test "$withval" = "no"; then NO_CHECK="$COMMENT"; fi)

GCC_LD="\$(GCC)"
EC_MODE="false"
EC=""
engine2='engine2$(OPT).o'
engine_fast2='engine-fast2$(OPT).o'
no_dynamic=""
image_i=""
signals_o="io.o signals.o"

AC_ARG_WITH(ec,
	AC_HELP_STRING([--with-ec=<arch>],
			[  Build gforth for systems without OS.]),
[if test "$withval" = "no"; then
  echo "defining hosted system"
else
  echo "defining standalone system (${withval})"
  AC_DEFINE(STANDALONE,,[Define if you want a Gforth without OS])
  EC_MODE="true"
  EC="-ec"
  engine2=""
  engine_fast2=""
  no_dynamic="-DNO_DYNAMIC"
  image_i="image.i"
  if test "$withval" != "yes"; then
    signals_o="io-${withval}.o"
  else
    signals_o="io.o"
  fi
  GCC_PATH=$(which $CC)
  LIB_PATH=${GCC_PATH%/*/*}
  GCC_LD="\$(LD)"
  platform=${withval}
fi])

#variables mentioned in INSTALL
AC_ARG_VAR(CC, [The C compiler (must support GNU C 2.x).])
AC_ARG_VAR(FORTHSIZES, [Gforth command line options for the default stack and dictionary sizes (see INSTALL).])
AC_ARG_VAR(STACK_CACHE_REGS, [number of registers in the maximum stack cache state for gforth-fast and gforth-native (default platform-dependent).])
AC_ARG_VAR(STACK_CACHE_DEFAULT_FAST, [number of registers in the default stack cache state for gforth-fast and gforth-native (default 1).])
AC_ARG_VAR(GCC_PR15242_WORKAROUND, [Force the enabling (1) or disabling (0) of a workaround for a gcc-3.x performance bug (default unset: use workaround for gcc-3.x)])
AC_ARG_VAR(LIBCC_BUILD_SRC, [(Additional) libcc interface source files that should be processed on building and installation (default none)])

AC_ARG_VAR(ac_cv_sizeof_char_p, [sizeof(char *)])
AC_ARG_VAR(ac_cv_sizeof_void_p, [sizeof(void *)])
AC_ARG_VAR(ac_cv_sizeof_char, [sizeof(char)])
AC_ARG_VAR(ac_cv_sizeof_short, [sizeof(short)])
AC_ARG_VAR(ac_cv_sizeof_int, [sizeof(int)])
AC_ARG_VAR(ac_cv_sizeof_long, [sizeof(long)])
AC_ARG_VAR(ac_cv_sizeof_long_long, [sizeof(long long)])
AC_ARG_VAR(ac_cv_sizeof_intptr_t, [sizeof(intptr_t)])
AC_ARG_VAR(ac_cv_sizeof_int128_t, [sizeof(int128_t)])
AC_ARG_VAR(ac_cv_sizeof_uint128_t, [sizeof(uint128_t)])
AC_ARG_VAR(ac_cv_c_bigendian, [Is the target big-endian ("yes" or "no")?])
AC_ARG_VAR(no_dynamic_default, [run gforth with --dynamic (0) or --no-dynamic (1) by default])
AC_ARG_VAR(condbranch_opt, [enable (1) or disable (0) using two dispatches for conditional branches])
AC_ARG_VAR(skipcode, [assembly code for skipping 16 bytes of code])
AC_ARG_VAR(asmcomment, [assembler comment start string])
AC_ARG_VAR(arm_cacheflush, [file containing ARM cacheflush function (without .c)])
AC_ARG_VAR(LTDL_LIBRARY_PATH, [additional directories for libltdl (for some 64-bit platforms)])

#set up feature test macros, so the tests get them right:
# turn on all POSIX, SUSv3, and GNU features if available
AC_GNU_SOURCE
dnl AC_DEFINE_UNQUOTED([_GNU_SOURCE],1,[feature test macro])

dnl Don't define _POSIX_SOURCE etc. because some OSs (in particular
dnl MacOSX) disable some features then (MacOSX checks for _POSIX_SOURCE,
dnl but not for _XOPEN_SOURCE)
dnl AC_DEFINE_UNQUOTED([_POSIX_SOURCE],1,[feature test macro])
dnl AC_DEFINE_UNQUOTED([_POSIX_C_SOURCE],199506L,[feature test macro])
dnl AC_DEFINE_UNQUOTED([_XOPEN_SOURCE],600,[feature test macro])
# turn on large file support with 64-bit off_t where available
AC_SYS_LARGEFILE
dnl AC_DEFINE_UNQUOTED([_LARGEFILE_SOURCE],1,[feature test macro])
dnl AC_DEFINE_UNQUOTED([_FILE_OFFSET_BITS],64,[feature test macro])

#currently we force direct threading this way.  Eventually we should
#setup in the arch and engine files right

AC_PROG_CC

test "$GCC" = "yes" || AC_MSG_ERROR(Gforth uses GNU C extensions and requires GCC 2.0 or higher)

AC_MSG_CHECKING([whether to use two dispatches per conditional branch])
test x$condbranch_opt = x && 
if ($CC -v 2>&1 |grep 'gcc version 3' >/dev/null); then
   condbranch_opt=0
else
   condbranch_opt=1
fi
AC_MSG_RESULT($condbranch_opt)
AC_SUBST(condbranch_opt)

AC_SUBST(CC)
AC_SUBST(GCC_LD)
AC_SUBST(DEBUGFLAG)
AC_SUBST(EC)
AC_SUBST(NO_CHECK)
AC_SUBST(EC_MODE)
AC_SUBST(engine2)
AC_SUBST(engine_fast2)
AC_SUBST(no_dynamic)
AC_SUBST(image_i)
AC_SUBST(signals_o)

#this is used to disable some (not generally essential) part of the
#Makefile that some makes don't grok.  It would be better to test for
#this specific Makefile feature than the make version.
AC_MSG_CHECKING(make type)
make_type=`make -n -v 2>&1|grep 'ake'|sed 's/ake .*/ake/'`
GNUMAKE='#'
test "$make_type" = "GNU Make" && GNUMAKE=''
AC_MSG_RESULT($make_type)
AC_SUBST(GNUMAKE)

AC_MSG_CHECKING([whether the linker accepts -export-dynamic])
OLDLDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -export-dynamic"
dnl AC_TRY_LINK gives false positive on rs6000-ibm-aix4.2.1.0
dnl AC_TRY_LINK(,,ac_export_dynamic=yes,ac_export_dynamic=no)
AC_TRY_RUN(main(){exit(0);},ac_export_dynamic=yes,ac_export_dynamic=no,ac_export_dynamic=no)
test $ac_export_dynamic = yes|| LDFLAGS=$OLDLDFLAGS
AC_MSG_RESULT($ac_export_dynamic)

#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 "$host_cpu" in
	arm*)
		machine=arm
		CFLAGS="$CFLAGS -fomit-frame-pointer"
		if test x$platform = xnxt; then
		   CFLAGS="$CFLAGS -mthumb -mthumb-interwork"
		fi
		if test -z $arm_cacheflush; then
		   case "$host_os" in
		     *linux*)
			AC_LIBOBJ(../arch/arm/cacheflush-linux) 
			;;
		     *)   
			no_dynamic_default=1
			AC_LIBOBJ(../arch/arm/cacheflush0)
			AC_MSG_WARN([No I-cache flush code known, disabling dynamic native code generation])
			;;
                   esac
                else
                   AC_LIBOBJ(../$arm_cacheflush)
                   test $srcdir = . || AC_MSG_WARN([setting arm_cacheflush requires building in the source directory])
		fi
                #longer skipcodes lead to problems on ARM, and it uses
                #only 4-byte alignment anyway
		test "$skipcode" || skipcode="nop"
		;;
	hppa*)
		machine=hppa
		AC_LIBOBJ(../arch/hppa/cache)
		LIBS="$LIBS -L/lib/pa1.1/"
		test "$skipcode" || skipcode="nop"
		#".skip 16" passes the test below,
		# but gives an assembler error in engine
		;;
	sparc*)
		machine=sparc
		;;
	i*86)
		machine=386
		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr"
		;;
	x86_64)
		case $CC
		in
		    *-m32*)
		    	machine=386
			CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr"
			CFLAGS_1="$CFLAGS"
			CFLAGS="$CFLAGS -march=athlon64"
			;;
		    *)
		    	machine=amd64
			;;
		esac
		;;
	ia64*)
		machine=ia64
		AC_LIBOBJ(../arch/ia64/flush_icache_block)
		test "$skipcode" || skipcode="nop.i 0"
		#".skip 16" passes the test below,
		# but gives an assembler error in engine
		;;
        m68k)
		machine=m68k
		CFLAGS="$CFLAGS -fomit-frame-pointer"
		if test "$host_os" = "nextstep3"
		then
			AC_LIBOBJ(termios)
		fi
		;;
	mips*)
		machine=mips
		#dynamic native code has the following problems on MIPS:
		#
		#1) J/JAL seems relocatable, but is only
		#relocatable within a 256MB-segment.  While we try to
		#get the linker to arrange this, there is no guarantee
		#that this will succeed (and if the user uses a lot of
		#memory, it is likely to fail).
		#
		#2) The way we generate dynamic native code may
		#violate MIPS architectural restrictions (in
		#particular, the delay slots of LW, MFLO, etc.)
		#
		#Therefore we disable dynamic native code by default:
		if test -z "$no_dynamic_default"; then
		    no_dynamic_default=1
		    AC_MSG_WARN([Disabling default dynamic native code generation (relocation and delay slot issues)])
		fi
		;;
	alpha*)
		machine=alpha
		#full IEEE FP support for more uniformity across platforms:
		CFLAGS="$CFLAGS -mieee"
		;;
	power*|rs6000)
		machine=power
		AC_CHECK_FUNC(_sync_cache_range,[true],[AC_LIBOBJ(../arch/power/_sync_cache_range)])
		#long long is broken on (at least) gcc-2.95.* for PPC
		test x$ac_cv_sizeof_long_long = x && 
		($CC -v 2>&1 |grep 'gcc version 2.95' >/dev/null) &&
                     ac_cv_sizeof_long_long=0
                #The only architecture with enough callee-saved registers
                test x$STACK_CACHE_REGS = x && STACK_CACHE_REGS=3
                #or use 2, hardly slower at run-time and starts up faster

                #the skipcode that is normally selected below does not
                #work with gcc-3.[34]
		test "$skipcode" || skipcode="nop\nnop\nnop\nnop"
		;;
	*)
		AC_MSG_WARN([Using a generic machine description])
		AC_MSG_WARN([Assuming C floats and doubles are IEEE floats and doubles (for SF@ DF@ SF! DF!)])
		AC_MSG_WARN([FLUSH-ICACHE will do nothing, so END-CODE may not work properly!])
		machine=generic
		#I-cache flushing would be needed for dynamic code generation
		if test -z $no_dynamic_default; then
		    no_dynamic_default=1
		    AC_MSG_WARN([No I-cache flush code known, disabling dynamic native code generation])
		fi
esac
AC_SUBST(host)

MAKEINC=""

echo "Check for arch/$machine/$platform/gforth.ld ($EC_MODE)"
if test x$EC_MODE = xtrue
then
	echo "Check for arch/$machine/$platform/gforth.ld"
	if test -f arch/$machine/$platform/gforth.ld
	then
		LDFLAGS="-T ../arch/$machine/$platform/gforth.ld -Map \$@.map -cref --gc-sections $LDFLAGS"
		if test x$platform = xnxt; then
			LIBS="$LIB_PATH/lib/gcc/arm-elf/$($CC --version | grep GCC | cut -d' ' -f3)/interwork/libgcc.a $LIB_PATH/arm-elf/lib/interwork/libc.a $LIBS"
		fi
	fi
	if test -f arch/$machine/$platform/make.inc
	then
		MAKEINC="include ../arch/$machine/$platform/make.inc"
	fi
fi
AC_SUBST(MAKEINC)

AC_ARG_VAR(STACK_CACHE_REGS, [number of registers in the maximum stack cache state for gforth-fast and gforth-native (default platform-dependent).])

test x$STACK_CACHE_REGS = x && STACK_CACHE_REGS=1
AC_DEFINE_UNQUOTED(STACK_CACHE_REGS, $STACK_CACHE_REGS,
		   [number of registers in the maximum stack cache state for gforth-fast and gforth-native])
test x$STACK_CACHE_DEFAULT_FAST = x && STACK_CACHE_DEFAULT_FAST=1
AC_DEFINE_UNQUOTED(STACK_CACHE_DEFAULT_FAST, $STACK_CACHE_DEFAULT_FAST,
		   [number of registers in the default stack cache state for gforth-fast and gforth-native])

test x$GCC_PR15242_WORKAROUND = x ||
AC_DEFINE_UNQUOTED(GCC_PR15242_WORKAROUND, $GCC_PR15242_WORKAROUND,
                   [force (1) or forbid (0) use of a workaround for a gcc performance bug])

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
    ;;
esac

AC_CHECK_SIZEOF(void *)
case "$ac_cv_sizeof_void_p" in
  2)
    vwordsize=16
    ;;
  4)
    vwordsize=32
    ;;
  8)
    vwordsize=64
    ;;
esac

AC_CHECK_SIZEOF(char)
AC_CHECK_SIZEOF(short)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(long long)
AC_CHECK_SIZEOF(intptr_t)
AC_CHECK_SIZEOF(int128_t)
AC_CHECK_SIZEOF(uint128_t)

AC_MSG_CHECKING([for a C type for cells])
ac_cv_int_type_cell=none
case "$ac_cv_sizeof_char_p" in
  $ac_cv_sizeof_int)
    ac_cv_int_type_cell=int
    ;;
  $ac_cv_sizeof_short)
    ac_cv_int_type_cell=short
    ;;
  $ac_cv_sizeof_char)
    ac_cv_int_type_cell=char
    ;;
  $ac_cv_sizeof_long)
    ac_cv_int_type_cell=long
    ;;
  $ac_cv_sizeof_long_long)
    ac_cv_int_type_cell="long long"
    ;;
  $ac_cv_sizeof_intptr_t)
    ac_cv_int_type_cell="intptr_t"
    ;;
esac
AC_MSG_RESULT($ac_cv_int_type_cell)
AC_DEFINE_UNQUOTED(CELL_TYPE,$ac_cv_int_type_cell,[an integer type that is as long as a pointer])

AC_MSG_CHECKING([for a C type for wydes])
ac_cv_wyde_type_cell=none
case 2 in
  $ac_cv_sizeof_int)
    ac_cv_wyde_type_cell=int
    ;;
  $ac_cv_sizeof_short)
    ac_cv_wyde_type_cell=short
    ;;
  $ac_cv_sizeof_char)
    ac_cv_wyde_type_cell=char
    ;;
  $ac_cv_sizeof_long)
    ac_cv_wyde_type_cell=long
    ;;
  $ac_cv_sizeof_long_long)
    ac_cv_wyde_type_cell="long long"
    ;;
  $ac_cv_sizeof_intptr_t)
    ac_cv_wyde_type_cell="intptr_t"
    ;;
esac
AC_MSG_RESULT($ac_cv_wyde_type_cell)
AC_DEFINE_UNQUOTED(WYDE_TYPE,$ac_cv_wyde_type_cell,[an integer type that is 2 bytes long])

AC_MSG_CHECKING([for a C type for tetrabytes])
ac_cv_tetrabyte_type_cell=none
case 4 in
  $ac_cv_sizeof_int)
    ac_cv_tetrabyte_type_cell=int
    ;;
  $ac_cv_sizeof_short)
    ac_cv_tetrabyte_type_cell=short
    ;;
  $ac_cv_sizeof_char)
    ac_cv_tetrabyte_type_cell=char
    ;;
  $ac_cv_sizeof_long)
    ac_cv_tetrabyte_type_cell=long
    ;;
  $ac_cv_sizeof_long_long)
    ac_cv_tetrabyte_type_cell="long long"
    ;;
  $ac_cv_sizeof_intptr_t)
    ac_cv_tetrabyte_type_cell="intptr_t"
    ;;
esac
AC_MSG_RESULT($ac_cv_tetrabyte_type_cell)
AC_DEFINE_UNQUOTED(TETRABYTE_TYPE,$ac_cv_tetrabyte_type_cell,[an integer type that is 4 bytes long])

AC_MSG_CHECKING([for a C type for double-cells])
ac_cv_int_type_double_cell=none
case `expr 2 '*' "$ac_cv_sizeof_char_p"` in
  $ac_cv_sizeof_short)
    ac_cv_int_type_double_cell=short
    ;;
  $ac_cv_sizeof_int)
    ac_cv_int_type_double_cell=int
    ;;
  $ac_cv_sizeof_long)
    ac_cv_int_type_double_cell=long
    ;;
  $ac_cv_sizeof_long_long)
    ac_cv_int_type_double_cell="long long"
    ;;
  $ac_cv_sizeof_intptr_t)
    ac_cv_int_type_double_cell="intptr_t"
    ;;
  $ac_cv_sizeof_int128_t)
    ac_cv_int_type_double_cell="int128_t"
    ;;
esac
AC_MSG_RESULT($ac_cv_int_type_double_cell)

AC_MSG_CHECKING([for a C type for unsigned double-cells])
ac_cv_int_type_double_ucell=none
case `expr 2 '*' "$ac_cv_sizeof_char_p"` in
  $ac_cv_sizeof_short)
    ac_cv_int_type_double_ucell="unsigned short"
    ;;
  $ac_cv_sizeof_int)
    ac_cv_int_type_double_ucell="unsigned int"
    ;;
  $ac_cv_sizeof_long)
    ac_cv_int_type_double_ucell="unsigned long"
    ;;
  $ac_cv_sizeof_long_long)
    ac_cv_int_type_double_ucell="unsigned long long"
    ;;
  $ac_cv_sizeof_intptr_t)
    ac_cv_int_type_double_ucell="unsigned intptr_t"
    ;;
  $ac_cv_sizeof_uint128_t)
    ac_cv_int_type_double_ucell="uint128_t"
    ;;
esac
AC_MSG_RESULT($ac_cv_int_type_double_ucell)

if test "$ac_cv_int_type_double_cell" != none && \
   test "$ac_cv_int_type_double_ucell" != none
then
	AC_DEFINE_UNQUOTED(DOUBLE_CELL_TYPE,$ac_cv_int_type_double_cell,[an integer type that is twice as long as a pointer])
	AC_DEFINE_UNQUOTED(DOUBLE_UCELL_TYPE,$ac_cv_int_type_double_ucell,[an unsigned integer type that is twice as long as a pointer])
        OPTS=-ll
else
        if test "$ac_cv_sizeof_char_p" = 8; then
           OPTS="-ll -noll"
        else
           OPTS=-noll
        fi
fi

if grep FORCE_REG $srcdir/arch/$machine/machine.h >/dev/null; then
   OPTS2=''
   for i in $OPTS; do OPTS2="$OPTS2 $i-reg"; done
   OPTS="$OPTS2 $OPTS"
else
  AC_DEFINE_UNQUOTED(FORCE_REG_UNNECESSARY,,[defined if the platform does not need FORCE_REG])
fi
AC_SUBST(OPTS)

AC_TYPE_OFF_T
AC_CHECK_SIZEOF(off_t)
test $ac_cv_sizeof_off_t -gt $ac_cv_sizeof_char_p
ac_small_off_t=$?
AC_DEFINE_UNQUOTED(SMALL_OFF_T,$ac_small_off_t,[1 if off_t fits in a Cell])

ENGINE_FLAGS=
AC_SUBST(ENGINE_FLAGS)

# Check whether GCC understands -fno-gcse

AC_MSG_CHECKING([if $CC understands -fno-gcse])
CFLAGS_1="$CFLAGS"
CFLAGS="$CFLAGS -fno-gcse"
AC_TRY_COMPILE(,,ac_nogcse=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-gcse",ac_nogcse=no)
CFLAGS="$CFLAGS_1"
AC_MSG_RESULT($ac_nogcse)

# Check whether GCC understands -fno-strict-aliasing
AC_MSG_CHECKING([if $CC understands -fno-strict-aliasing])
CFLAGS_1="$CFLAGS"
CFLAGS="$CFLAGS -fno-strict-aliasing"
AC_TRY_COMPILE(,,ac_nostrictaliasing=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-strict-aliasing",ac_nostrictaliasing=no)
CFLAGS="$CFLAGS_1"
AC_MSG_RESULT($ac_nostrictaliasing)

# Check whether GCC understands -fno-crossjumping
AC_MSG_CHECKING([if $CC understands -fno-crossjumping])
CFLAGS_1="$CFLAGS"
CFLAGS="$CFLAGS -fno-crossjumping"
AC_TRY_COMPILE(,,ac_nocrossjumping=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-crossjumping",ac_nocrossjumping=no)
CFLAGS="$CFLAGS_1"
AC_MSG_RESULT($ac_nocrossjumping)

# Check whether GCC understands -fno-reorder-blocks
AC_MSG_CHECKING([if $CC understands -fno-reorder-blocks])
CFLAGS_1="$CFLAGS"
CFLAGS="$CFLAGS -fno-reorder-blocks"
AC_TRY_COMPILE(,,ac_noreorder_blocks=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-reorder-blocks",ac_noreorder_blocks=no)
CFLAGS="$CFLAGS_1"
AC_MSG_RESULT($ac_noreorder_blocks)

# Check whether GCC understands -falign-labels=1
AC_MSG_CHECKING([if $CC understands -falign-labels=1])
CFLAGS_1="$CFLAGS"
CFLAGS="$CFLAGS -falign-labels=1"
AC_TRY_COMPILE(,,ac_align_labels=yes;ENGINE_FLAGS="$ENGINE_FLAGS -falign-labels=1",ac_align_labels=no)
CFLAGS="$CFLAGS_1"
AC_MSG_RESULT($ac_align_labels)

# Check whether GCC understands -falign-loops=1
AC_MSG_CHECKING([if $CC understands -falign-loops=1])
CFLAGS_1="$CFLAGS"
CFLAGS="$CFLAGS -falign-loops=1"
AC_TRY_COMPILE(,,ac_align_loops=yes;ENGINE_FLAGS="$ENGINE_FLAGS -falign-loops=1",ac_align_loops=no)
CFLAGS="$CFLAGS_1"
AC_MSG_RESULT($ac_align_loops)

# Check whether GCC understands -falign-jumps=1
AC_MSG_CHECKING([if $CC understands -falign-jumps=1])
CFLAGS_1="$CFLAGS"
CFLAGS="$CFLAGS -falign-jumps=1"
AC_TRY_COMPILE(,,ac_align_jumps=yes;ENGINE_FLAGS="$ENGINE_FLAGS -falign-jumps=1",ac_align_jumps=no)
CFLAGS="$CFLAGS_1"
AC_MSG_RESULT($ac_align_jumps)

# Check whether GCC understands __attribute__((unused))
AC_MSG_CHECKING([how to suppress 'unused variable' warnings])
AC_TRY_COMPILE(,[int __attribute__((unused)) foo;], MAYBE_UNUSED='__attribute__((unused))',)
AC_DEFINE_UNQUOTED(MAYBE_UNUSED,$MAYBE_UNUSED,[attribute for possibly unused variables])
AC_MSG_RESULT($MAYBE_UNUSED)

# Check whether m4 understands -s
AC_MSG_CHECKING([how to invoke m4])
if m4 -s /dev/null >/dev/null 2>&1; then
 M4="m4 -s"
else
 M4=m4
fi
AC_SUBST(M4)
AC_MSG_RESULT($M4)

# Find installed Gforth
AC_MSG_CHECKING([for gforth])
GFORTH="`cd / && which gforth 2>/dev/null`"
#the "$srcdir" = "." test defends against the "../" bug in gforth-0.6.2
(cd / && $GFORTH -e bye >/dev/null 2>/dev/null  && test "$srcdir" = ".") || GFORTH=""
if test -z "$GFORTH"; then
  PREFORTH='echo "You need to configure with a gforth in \$PATH to build this part" && false'
  kernel_anti_dependence=''
else
  PREFORTH="$GFORTH -i `cd / && $GFORTH --debug -e bye 2>&1 |grep "Opened image file: "|sed 's/Opened image file: //'`" ;
  kernel_anti_dependence='$(kernel_fi)'
fi
AC_SUBST(PREFORTH)
AC_SUBST(kernel_anti_dependence)
AC_MSG_RESULT($PREFORTH)

#echo "machine='$machine'"

dnl AC_CHECK_PROG(asm_fs,asm.fs,arch/$machine/asm.fs,,$srcdir/arch/$machine)
AC_CHECK_FILE($srcdir/arch/$machine/asm.fs,[asm_fs=arch/$machine/asm.fs],)
AC_SUBST(asm_fs)

dnl AC_CHECK_PROG(disasm_fs,disasm.fs,arch/$machine/disasm.fs,,$srcdir/arch/$machine)
AC_CHECK_FILE($srcdir/arch/$machine/disasm.fs,[disasm_fs=arch/$machine/disasm.fs],)
AC_SUBST(disasm_fs)

AC_PATH_PROG(INSTALL_INFO,install-info,[echo '>>>>Please make info dir entry:'],$PATH:/sbin:/usr/sbin:/usr/local/sbin)

case "$host_os" in
	*win32*)
		# !!!FIXME!!! problems with cygwin and ';' as path separator
		DIRSEP="\\\\"
		PATHSEP=";"
		#we want the builtins of command.com/cmd.exe and its
		# handling of .com files.
		#$COMSPEC contains the name of the Windows shell;
		# the ./ is there, because the bash does not recognize
		# absolute DOS filenames
		DEFAULTSYSTEMPREFIX="./$COMSPEC /c "
		;;
	*darwin*)
		#Darwin uses some funny preprocessor by default; eliminate it:
		AC_MSG_NOTICE([using -no-cpp-precomp on Darwin])
		CFLAGS="$CFLAGS -no-cpp-precomp"
		DIRSEP="/"
		PATHSEP=":"
		DEFAULTSYSTEMPREFIX=""
                #the following magic value was suggested by
                #http://mail.python.org/pipermail/pythonmac-sig/2005-October/015190.html
                AC_DEFINE_UNQUOTED(MACOSX_DEPLOYMENT_TARGET,"10.3",[an environment variable value needed by libtool on some MacOS X versions])
		;;
	*linux*)
		DIRSEP="/"
		PATHSEP=":"
		DEFAULTSYSTEMPREFIX=""
		if test -z "$LTDL_LIBRARY_PATH" -a "$wordsize" = 64; then
		   LTDL_LIBRARY_PATH=`/sbin/ldconfig -p |tail -n +2 |sed 's/^.* => //'|sed 's|/[[^/]]*$||'| grep 64 | sort -u | tr '\n' : | sed -e 's/:$//'`
		fi
		;;
	*)
		DIRSEP="/"
		PATHSEP=":"
		DEFAULTSYSTEMPREFIX=""
		;;
esac
AC_SUBST(DIRSEP)
AC_DEFINE_UNQUOTED(DIRSEP,'$DIRSEP',[a directory separator character])
AC_SUBST(PATHSEP)
AC_DEFINE_UNQUOTED(PATHSEP,'$PATHSEP',[a path separator character])
AC_SUBST(DEFAULTSYSTEMPREFIX)
AC_DEFINE_UNQUOTED(DEFAULTSYSTEMPREFIX,"$DEFAULTSYSTEMPREFIX",[default for environment variable GFORTHSYSTEMPREFIX])
if test -n "$LTDL_LIBRARY_PATH"; then
   AC_DEFINE_UNQUOTED(LTDL_LIBRARY_PATH,"$LTDL_LIBRARY_PATH",[Define LTDL_LIBRARY_PATH for 64 bit Linux])
fi                                                                

#work around SELinux brain damage (from Andrew Haley <12t8f3jakb74g2c@news.supernews.com>)
#This magic incantation  seems to be completely undocumented.
AC_CHECK_PROG([MASSAGE_EXE],[chcon],[chcon -t unconfined_execmem_exec_t],[true])

dnl Now a little support for DOS/DJGCC
AC_SUBST(GFORTH_EXE)
GFORTH_EXE="true"
AC_SUBST(GFORTHFAST_EXE)
GFORTHFAST_EXE="true"
AC_SUBST(GFORTHITC_EXE)
GFORTHITC_EXE="true"
AC_SUBST(GFORTHDITC_EXE)
GFORTHDITC_EXE="true"

AC_SUBST(FORTHSIZES)

dnl if test "$PEEPHOLE" = "yes"
dnl then
dnl    PEEPHOLEFLAG="true"
dnl    AC_DEFINE(HAS_PEEPHOLE,,[Define if you want to use peephole optimization])
dnl else
dnl    PEEPHOLEFLAG="false"
dnl fi
PEEPHOLEFLAG="true"
AC_SUBST(PEEPHOLEFLAG)

dnl copy commands for systems that don't have links
AC_SUBST(LINK_KERNL)
LINK_KERNL=""

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

dnl the following macro produces a warning with autoconf-2.1
AC_C_BIGENDIAN
AC_SUBST(KERNEL)
dnl ac_cv_c_bigendian is an undocumented variable of autoconf-2.1
if test $ac_cv_c_bigendian != no; then
  bytesex=b
  KERNEL="kernl16b.fi kernl16l.fi kernl32b.fi kernl32l.fi kernl64b.fi kernl64l.fi"
else
  bytesex=l
  KERNEL="kernl16l.fi kernl16b.fi kernl32l.fi kernl32b.fi kernl64l.fi kernl64b.fi"
fi

#check how to do asm(".skip 16")
#echo "CFLAGS=$CFLAGS"
#echo "ac_link=$ac_link"
AC_MSG_CHECKING([if and how we can waste code space])
if test -z "$skipcode"; then
    skipcode=no
    CFLAGS_1="$CFLAGS"
    CFLAGS="$CFLAGS $ENGINE_FLAGS"
    for i in ".skip 16" ".block 16" ".org .+16" ".=.+16" ".space 16"
    do
	AC_TRY_RUN(
[int foo(int,int,int);
main()
{
  exit(foo(0,0,0)!=16);
}
int foo(int x, int y, int z)
{
  static void *labels[]={&&label1, &&label2};
  if (x) {
    y++; /* workaround for http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12108 */
  label1:
    asm("$i"); /* or ".space 16" or somesuch */
  label2: ;
  }
  {
  if (y) goto *labels[z]; /* workaround for gcc PR12108 */
  return labels[1]-labels[0];
  }
}]
	,skipcode=$i; break
	,,)
    done
    CFLAGS=$CFLAGS_1
fi
AC_MSG_RESULT($skipcode)
if test "$skipcode" = no
then 
    if test -z $no_dynamic_default; then
	no_dynamic_default=1
	AC_MSG_WARN(Disabling default dynamic native code generation)
    fi
    AC_DEFINE_UNQUOTED(SKIP16,((void)0),statement for skipping 16 bytes)
else
    AC_DEFINE_UNQUOTED(SKIP16,asm("$skipcode"),statement for skipping 16 bytes)
fi

AC_MSG_CHECKING([if and how we can do comments in asm statements])
#the point here is to get asm statements that look different to
#gcc's "optimizer"
if test -z "$asmcomment"; then
    asmcomment=no
    CFLAGS_1="$CFLAGS"
    CFLAGS="$CFLAGS $ENGINE_FLAGS"
    for i in '"# "' '"! "' '"; "'; do
	AC_TRY_COMPILE(,[asm($i"fluffystunk");],asmcomment=$i; break,)
    done
    CFLAGS=$CFLAGS_1
fi
AC_MSG_RESULT($asmcomment)
if test "$asmcomment" != no
then 
    AC_DEFINE_UNQUOTED(ASMCOMMENT,$asmcomment,[assembler comment start string])
fi

test "$no_dynamic_default" || no_dynamic_default=0
AC_DEFINE_UNQUOTED(NO_DYNAMIC_DEFAULT,$no_dynamic_default,default value for no_dynamic)

dnl Checks for programs.
AC_PROG_LN_S
AC_PROG_INSTALL
AC_CHECK_PROGS(TEXI2DVI,texi2dvi4a2ps texi2dvi)

dnl MacOS X has a libtool that does something else
AC_CHECK_PROGS(GNU_LIBTOOL,"glibtool --tag=CC" libtool)

if test -n "$GNU_LIBTOOL"; then
  build_libcc_named=build-libcc-named
else
  build_libcc_named=""
fi
AC_SUBST(build_libcc_named)


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_CHECK_LIB(ltdl,lt_dlinit)
#check for libffi 2.x
AC_CHECK_HEADER(ffi.h,FFI_H_NAME=ffi.h,)
if test -z "$FFI_H_NAME"; then
  AC_CHECK_HEADER(ffi/ffi.h,FFI_H_NAME=ffi/ffi.h,)
fi
AC_SUBST(FFI_H_NAME)
AC_CHECK_LIB(ffi,ffi_call)
if test -n "$FFI_H_NAME" -a $ac_cv_lib_ffi_ffi_call = yes
then
  LIBFFIFLAG="true"
  LIBCC_BUILD_SRC="$LIBCC_BUILD_SRC libffi.fs"
else
  LIBFFIFLAG="false"
fi
#check for ffcall libraries
#unfortunately, these four calls are separated out into a library each.
AC_CHECK_LIB(avcall,__builtin_avcall)
dnl AC_CHECK_LIB(callback,__vacall_r)
dnl AC_CHECK_LIB(vacall,vacall)
dnl AC_CHECK_LIB(trampoline,alloc_trampoline)
if test $ac_cv_lib_avcall___builtin_avcall = yes; then
  FFCALLFLAG="true"
  LIBCC_BUILD_SRC="$LIBCC_BUILD_SRC fflib.fs"
else
  FFCALLFLAG="false"
fi
if test $LIBFFIFLAG = false -a $FFCALLFLAG = false; then
  AC_MSG_WARN([The (old) lib.fs foreign function interface needs either libffi or the ffcall libraries])
fi
AC_SUBST(LIBFFIFLAG)
AC_SUBST(FFCALLFLAG)
AC_SUBST(LIBCC_BUILD_SRC)
if test "$host_os" != "nextstep3"
then
	AC_FUNC_MEMCMP
fi
AC_REPLACE_FUNCS(memmove strtoul pow10 strerror strsignal atanh)
AC_FUNC_FSEEKO
AC_CHECK_FUNCS(ftello dlopen sys_siglist getrusage nanosleep)
AC_CHECK_TYPES(stack_t,,,[#include <signal.h>])
AC_DECL_SYS_SIGLIST
AC_CHECK_FUNC(getopt_long,[true],[AC_LIBOBJ(getopt) AC_LIBOBJ(getopt1)])
AC_CHECK_FUNCS(expm1 log1p)
AC_REPLACE_FUNCS(rint ecvt)
dnl No check for select, because our replacement is no good under
dnl anything but DOS
AC_CHECK_HEADERS(sys/mman.h fnmatch.h alloca.h wchar.h)
AC_FUNC_FNMATCH
test $ac_cv_func_fnmatch_works = yes || AC_LIBOBJ(fnmatch)
AC_CHECK_FUNCS(mmap sysconf getpagesize wcwidth)
AM_PATH_LISPDIR

kernel_fi=kernl${vwordsize}${bytesex}.fi
include_fi=kernl${wordsize}${bytesex}${EC}.fi
AC_SUBST(kernel_fi)
AC_SUBST(include_fi)

#this breaks bindists
#dnl replace srource directory by absolute value
#if test $srcdir = "."; then srcdir=`pwd` 
#fi

AC_SUBST(machine)
AC_CONFIG_FILES([
Makefile
Makedist
gforthmi
vmgen
machpc.fs
envos.fs
preforth
engine/Makefile
engine/libcc.h
doc/version.texi
build-ec ])
AC_CONFIG_COMMANDS([stamp-h],[[echo timestamp > stamp-h
chmod +x gforthmi
chmod +x vmgen
chmod +x build-ec
chmod +x preforth
test -d kernel||mkdir kernel
if test $srcdir != "."; then ln -sf $srcdir/gforth.el .; fi
$srcdir/mkinstalldirs include/gforth/$PACKAGE_VERSION
$srcdir/mkinstalldirs arch/$machine
ln -sf ../../../engine/config.h ../../../engine/libcc.h include/gforth/$PACKAGE_VERSION]],
[PACKAGE_VERSION=$PACKAGE_VERSION
 machine=$machine])
AC_OUTPUT