File:  [gforth] / gforth / configure.in
Revision 1.231: download - view: text, annotated - select for diffs
Tue Jul 15 16:11:49 2008 UTC (12 years, 11 months ago) by anton
Branches: MAIN
CVS tags: HEAD
updated copyright years
updated copyright-blacklist (added libltdl)
updated distributed files (don't distribute files without distribution terms)
added copyright to preforth.in and build-ec.in

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],[0.6.9-20080715],[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="July 15, 2008"
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 occuring
                          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 informations.],
if test "$withval" = "yes"; then DEBUGFLAG=-g; 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(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_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)])

#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 -q 'gcc version 3'); 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(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*)
			arm_cacheflush=arch/arm/cacheflush-linux 
			;;
		     *)   
			no_dynamic_default=1
			arm_cacheflush=arch/arm/cacheflush0
			AC_MSG_WARN([No I-cache flush code known, disabling dynamic native code generation])
			;;
                   esac
		fi
                AC_LIBSOURCES([../arch/arm/cacheflush0, dnl
			       ../arch/arm/cacheflush-linux])
                AC_LIBOBJ(../$arm_cacheflush)
                #longer skipcodes lead to problems on ARM, and it uses
                #only 4-byte alignment anyway
		test "$skipcode" || skipcode="nop"
		;;
	hppa*)
		machine=hppa
		$srcdir/mkinstalldirs arch/hppa
		AC_LIBOBJ(../arch/hppa/cache)
		#-N needed for --dynamic <M4U3b.3790$9d.317@news.cpqcorp.net>
		LDFLAGS="$LDFLAGS -Xlinker -N"
		LIBS="$LIBS -L/lib/pa1.1/"
		;;
	sparc*)
		machine=sparc
		;;
	i386)
		machine=386
		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr"
		;;
	i486)
		machine=386
		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -m486"
		;;
	i*86)
		machine=386
		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr"
		CFLAGS_1="$CFLAGS"
		CFLAGS="$CFLAGS -march=pentium"
		AC_TRY_COMPILE(,,,CFLAGS="$CFLAGS_1 -m486")
		;;
	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 are 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
		$srcdir/mkinstalldirs arch/power
		AC_CHECK_FUNC(_sync_cache_range,[true],[AC_LIBOBJ(../arch/power/_sync_cache_range)])
		#long long is broken on (at least) gcc-2.95.* for PPC
		test x$ac_cv_sizeof_long_long = x && 
		($CC -v 2>&1 |grep -q 'gcc version 2.95') &&
		ac_cv_sizeof_long_long=0
                #The only architecture with enough callee-saved registers
                test x$STACK_CACHE_REGS = x && STACK_CACHE_REGS=3
                #or use 2, hardly slower at run-time and starts up faster
		;;
	*)
		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 -q FORCE_REG arch/$machine/machine.h; 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)

# Try if 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)

# Try if 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)

# Try if 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)

# Try if 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)

# Try if 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)

# Try if 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)

# Try if 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)

# Try if 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)

#try if 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_DEFINE_UNQUOTED(M4,"$M4",[How to invoke m4])
AC_MSG_RESULT($M4)

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

#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 = yes; 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 libtool)

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)
dnl check for libffi 2.x
AC_CHECK_LIB(ffi,ffi_call)
if test $ac_cv_lib_ffi_ffi_call = yes
then
LIBFFIFLAG="true"
FFCALLFLAG="false"
OLDCALLFLAG="false"
AC_DEFINE(HAS_LIBFFI,,[define this if you want to use the ffcall interface with libffi 2.0])
else
dnl check for ffcall libraries
dnl unfortunately, these four calls are separated out into a library each.
AC_CHECK_LIB(avcall,__builtin_avcall)
AC_CHECK_LIB(callback,__vacall_r)
AC_CHECK_LIB(vacall,vacall)
AC_CHECK_LIB(trampoline,alloc_trampoline)
LIBFFIFLAG="false"
FFCALLFLAG="false"
OLDCALLFLAG="true"
test $ac_cv_lib_avcall___builtin_avcall = yes && FFCALLFLAG="true" && OLDCALLFLAG="false" && AC_DEFINE(HAS_FFCALL,,[define this if you want to use the ffcall libraries])
test $ac_cv_lib_avcall___builtin_avcall = no && AC_DEFINE(HAS_OLDCALL,,[define this if you want to use the old call libraries])
fi
AC_SUBST(LIBFFIFLAG)
AC_SUBST(FFCALLFLAG)
AC_SUBST(OLDCALLFLAG)
if test "$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)
AC_FUNC_FNMATCH
test $ac_cv_func_fnmatch_works = yes || AC_LIBOBJ(fnmatch)
AC_CHECK_FUNCS(mmap sysconf getpagesize)
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
$srcdir/mkinstalldirs include/gforth/$PACKAGE_VERSION
ln -sf ../../../engine/config.h ../../../engine/libcc.h include/gforth/$PACKAGE_VERSION]],[[PACKAGE_VERSION=$PACKAGE_VERSION]])
AC_OUTPUT


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