Diff for /gforth/configure.in between versions 1.18 and 1.156

version 1.18, 1995/12/26 17:35:35 version 1.156, 2006/02/19 22:35:40
Line 1 Line 1
 dnl Process this file with autoconf to produce a configure script.  dnl Process this file with autoconf to produce a configure script.
 AC_INIT(engine.c)  
 AC_CONFIG_HEADER(config.h)  #Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   
   
   dnl We use some automake macros here,
   dnl but don't use automake for creating Makefile.in
   AC_INIT([gforth],[0.6.2-20060219],[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="September 10, 2003"
   AC_SUBST(UPDATED)
   AC_CONFIG_HEADERS(engine/config.h)
   
   #suppress the "-g -O2" default
   test "$CFLAGS" || CFLAGS=-O2
   
 AC_ARG_ENABLE(force-reg,  AC_ARG_ENABLE(force-reg,
 [  --enable-force-reg     Use explicit register declarations if they appear in          AC_HELP_STRING([--enable-force-reg],
                           [ Use explicit register declarations if they appear in
                           the machine.h file. This can cause a good speedup,                            the machine.h file. This can cause a good speedup,
                           but also incorrect code with some gcc versions on                            but also incorrect code with some gcc versions on
                           some processors (default disabled).],                            some processors (default disabled).]),
           ,enable_force_reg=no)
 AC_DEFINE(FORCE_REG))  test "$enable_force_reg" = "no"||
 dnl this is not quite according to the autoconf manual, it causes a replacement    AC_DEFINE(FORCE_REG,,[Define if you want to use explicit register declarations for better performance or for more convenient CODE words (does not work with all GCC versions on all machines)])
 AC_ARG_ENABLE(direct-threaded,  
 [  --enable-direct-threaded     Force direct threading. This may not work on  AC_ARG_ENABLE(force-ll,
                                 some machines and may cause slowdown on others.          AC_HELP_STRING([--enable-force-ll],
                                 (default processor-dependent)],                         [  Use explicit long long declarations if they appear in
 AC_DEFINE(DIRECT_THREADED))                            the machine.h file. This can cause a good speedup,
 AC_ARG_ENABLE(indirect-threaded,                            but also incorrect code with some gcc versions on
 [  --enable-indirect-threaded   Force indirect threading. This can cause a                            some processors (default disabled).]),
                                 slowdown on some machines.          ,enable_force_ll=no)
                                 (default processor-dependent)],  test "$enable_force_ll" = "no"||
 AC_DEFINE(INDIRECT_THREADED))    AC_DEFINE(FORCE_LL,,[Define if you want to use explicit long long declarations for better performance (does not work with all GCC versions on all machines)])
   
   AC_ARG_ENABLE(gcc-pr15242-workaround,
                 AC_HELP_STRING([--disable-gcc-pr15242-workaround],[Disables
                                dynamic code generation on some versions of gcc
                                (slowdown~2 on Athlon) and causes slower building
                                of gforth (but gforth speedups) on others.
                                (default enabled)]),
                   ,enable_gcc_pr15242_workaround=yes)
   test "$enable_gcc_pr15242_workaround" = "no"||
   AC_DEFINE(GCC_PR15242_WORKAROUND,,[Define if you want to get dynamic code
   generation on gccs affected by PR15242])
   
   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\$(EXE)"; PROFOBJS="engine-prof.o main-prof.o profile.o"
   fi
   
 AC_ARG_WITH(debug,  AC_ARG_WITH(debug,
 [  --with-debug     specifies option -g to compile with debug info (default)  [  --with-debug           specifies option -g to compile with debug info
    --without-debug  omits the -g switch and creates smaller images on    --without-debug         omits the -g switch and creates smaller images on
                     machines where "strip" has problems with gcc style                            machines where "strip" has problems with gcc style
                     debugging informations.],                            debugging informations.],
 if test "$withval" = "yes"; then DEBUGFLAG=-g; fi)  if test "$withval" = "yes"; then DEBUGFLAG=-g; fi)
   
 CFLAGS=$CFLAGS  dnl PEEPHOLE="yes"
   dnl AC_ARG_WITH(peephole,
   dnl [  --with-peephole  Enable peephole optimization (default)
   dnl   --without-peephole        disables peephole optimization. Creates smaller,
   dnl                     but slower images.],
   dnl PEEPHOLE="$withval")
   
   #variables mentioned in INSTALL
   AC_ARG_VAR(CC, [The C compiler (must support GNU C 2.x); gcc-2.95 recommended.])
   AC_ARG_VAR(FORTHSIZES, [Gforth command line options for the default stack and dictionary sizes (see INSTALL).])
   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(ac_cv_sizeof_char_p, [sizeof(char *)])
   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(skip_code, [assembly code for skipping 16 bytes of code])
   
   #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  AC_PROG_CC
   
 if test "$GCC" = "yes"  test "$GCC" = "yes" || AC_MSG_ERROR(Gforth uses GNU C extensions and requires GCC 2.0 or higher)
 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(CC)
 AC_SUBST(GCCLDFLAGS)  
 AC_SUBST(DEBUGFLAG)  AC_SUBST(DEBUGFLAG)
   
 dnl the following macro produces a warning with autoconf-2.1  AC_MSG_CHECKING(make type)
 AC_CHECK_SIZEOF(char *)  make_type=`make -v 2>&1|grep 'ake'|sed 's/ake .*/ake/'`
 case "$ac_cv_sizeof_char_p" in  
   2)  GNUMAKE='#'
     wordsize=16  test "$make_type" = "GNU Make" && GNUMAKE=''
     ;;  
   4)  AC_MSG_RESULT($make_type)
     wordsize=32  
     ;;  AC_SUBST(GNUMAKE)
   8)  
     wordsize=64  AC_MSG_CHECKING([whether the linker accepts -export-dynamic])
 dnl    AC_CHECK_SIZEOF(long long)  OLDLDFLAGS=$LDFLAGS
 dnl    if [ $ac_cv_sizeof_long_long != 16 ]  LDFLAGS="$LDFLAGS -export-dynamic"
 dnl    then  dnl AC_TRY_LINK gives false positive on rs6000-ibm-aix4.2.1.0
 dnl       try the whole thing with -mlonglong128  dnl AC_TRY_LINK(,,ac_export_dynamic=yes,ac_export_dynamic=no)
 dnl complain about C compiler and OS vendor  AC_TRY_RUN(main(){exit(0);},ac_export_dynamic=yes,ac_export_dynamic=no,ac_export_dynamic=no)
 dnl    fi  test $ac_export_dynamic = yes|| LDFLAGS=$OLDLDFLAGS
     ;;  AC_MSG_RESULT($ac_export_dynamic)
 esac  
   
 #terminology is a bit unusual here: The host is the system on which  #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'  #gforth will run; the system on which configure will run is the `build'
 AC_CANONICAL_HOST  AC_CANONICAL_HOST
 case "$host_cpu" in  case "$host_cpu" in
           arm*)
                   machine=arm
                   CFLAGS="$CFLAGS -fomit-frame-pointer"
                   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
                   ;;
         hppa*)          hppa*)
                 mach_h=hppa                  machine=hppa
                 LIBOBJS="cache.o"                  $srcdir/mkinstalldirs arch/hppa
                 LDFLAGS="-Xlinker -N"                  AC_LIBOBJ(../arch/hppa/cache)
                 LIBS="-L/lib/pa1.1/"                  #-N needed for --dynamic <M4U3b.3790$9d.317@news.cpqcorp.net>
                   LDFLAGS="$LDFLAGS -Xlinker -N"
                   LIBS="$LIBS -L/lib/pa1.1/"
                 ;;                  ;;
         sparc*)          sparc*)
                 mach_h=sparc                  machine=sparc
                   ;;
           i386)
                   machine=386
                   CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem"
                   ;;
           i486)
                   machine=386
                   CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem -m486"
                 ;;                  ;;
         i386|i486|i586)          i*86)
                 mach_h=386                  machine=386
                 CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem"                  CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem"
                 #!! direct/indirect threading switch                  CFLAGS_1="$CFLAGS"
                 #!! -m486 flag                  CFLAGS="$CFLAGS -march=pentium"
                   AC_TRY_COMPILE(,,,CFLAGS="$CFLAGS_1 -m486")
                   ;;
           x86_64)
                   machine=amd64
                   ;;
           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*)          mips*)
                 mach_h=mips                  machine=mips
                 #link text and data segment into the same 256M region!                  #dynamic native code has the following problems on MIPS:
                 GCCLDFLAGS="-Xlinker -T -Xlinker 10000000 -Xlinker -D -Xlinker 10400000"                  #
                   #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 $no_dynamic_default; then
                       no_dynamic_default=1
                       AC_MSG_WARN([Disabling default dynamic native code generation (relocation and delay slot issues)])
                   fi
                 ;;                  ;;
         alpha*)          alpha*)
                 mach_h=alpha                  machine=alpha
                 echo Very Preliminary Support for Alpha!!!                  #full IEEE FP support for more uniformity across platforms:
                   CFLAGS="$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 && ac_cv_sizeof_long_long=0
                 ;;                  ;;
         *)          *)
                 echo "No direct threading support for $host_cpu, using indirect threading."                  AC_MSG_WARN([Using a generic machine description])
                 echo "Using a generic machine description. It will only work if char * AND"                  AC_MSG_WARN([Assuming C floats and doubles are IEEE floats and doubles (for SF@ DF@ SF! DF!)])
                 echo "long values have the same size and long long is twice as long."                  AC_MSG_WARN([FLUSH-ICACHE will do nothing, so END-CODE may not work properly!])
                 echo "I'll assume that C floats and doubles are represented by IEEE single and"                  machine=generic
                 echo "double numbers. If this is not so, SF@ etc. will not work correctly."                  #I-cache flushing would be needed for dynamic code generation
                 echo "FLUSH-ICACHE will do nothing, so END-CODE may not work properly!"                  if test -z $no_dynamic_default; then
                 mach_h=32bit                      no_dynamic_default=1
                       AC_MSG_WARN([No I-cache flush code known, disabling dynamic native code generation])
                   fi
 esac  esac
 AC_SUBST(host)  AC_SUBST(host)
   
   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])
   
   if test "${enable_force_ll+set}" = set; then
      ac_includes_default="$ac_includes_default
   #include \"arch/generic/128bit.h\""
   fi
   
   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(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"
       ;;
     $ac_cv_sizeof_int128_t)
       ac_cv_int_type_cell="int128_t"
       ;;
   esac
   AC_MSG_RESULT($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"
       ;;
     $ac_cv_sizeof_int128_t)
       ac_cv_wyde_type_cell="int128_t"
       ;;
   esac
   AC_MSG_RESULT($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"
       ;;
     $ac_cv_sizeof_int128_t)
       ac_cv_tetrabyte_type_cell="int128_t"
       ;;
   esac
   AC_MSG_RESULT($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_MSG_WARN([Emulating double-cell arithmetic. This may be slow.])
           AC_LIBOBJ(dblsub)
           AC_DEFINE(BUGGY_LONG_LONG,,[define this if there is no working DOUBLE_CELL_TYPE on your machine])
   else
           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])
   fi
   
   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)  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 __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)
   
   AC_CHECK_PROG(asm_fs,asm.fs,arch/$machine/asm.fs,,$srcdir/arch/$machine)
   AC_SUBST(asm_fs)
   
   AC_CHECK_PROG(disasm_fs,disasm.fs,arch/$machine/disasm.fs,,$srcdir/arch/$machine)
   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 "$host_os" in
           *win32|cygwin)
                   DIRSEP="\\\\"
                   PATHSEP=";"
                   #we want the builtins of command.com/cmd.exe and its
                   # handling of .com files.
                   #$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])
   
 dnl Now a little support for DOS/DJGCC  dnl Now a little support for DOS/DJGCC
 AC_SUBST(MAKE_EXE)  AC_SUBST(GFORTH_EXE)
 MAKE_EXE=""  GFORTH_EXE=""
   AC_SUBST(GFORTHFAST_EXE)
   GFORTHFAST_EXE=""
   AC_SUBST(GFORTHITC_EXE)
   GFORTHITC_EXE=""
   AC_SUBST(GFORTHDITC_EXE)
   GFORTHDITC_EXE=""
   
   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  dnl copy commands for systems that don't have links
 AC_SUBST(LINK_KERNL16L)  AC_SUBST(LINK_KERNL)
 LINK_KERNL16L=""  LINK_KERNL=""
 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  #if test $host_os=dos
 #then  #then
 #  echo Configuring for DOS!!!  #  echo Configuring for DOS!!!
 #  MAKE_EXE="coff2exe gforth"  #  MAKE_EXE="coff2exe gforth"
 #  LINK_KERNL32L='$(CP) kernl32l.fi kernal.fi'  #  LINK_KERNL='$(CP) kernl32l.fi kernel.fi'
 #fi  #fi
   
 dnl the following macro produces a warning with autoconf-2.1  dnl the following macro produces a warning with autoconf-2.1
 AC_C_BIGENDIAN  AC_C_BIGENDIAN
 AC_SUBST(KERNAL)  AC_SUBST(KERNEL)
 dnl ac_cv_c_bigendian is an undocumented variable of autoconf-2.1  dnl ac_cv_c_bigendian is an undocumented variable of autoconf-2.1
 if test $ac_cv_c_bigendian = yes; then  if test $ac_cv_c_bigendian = yes; then
   bytesex=b    bytesex=b
   KERNAL="kernl16b.fi kernl16l.fi kernl32b.fi kernl32l.fi kernl64b.fi kernl64l.fi"    KERNEL="kernl16b.fi kernl16l.fi kernl32b.fi kernl32l.fi kernl64b.fi kernl64l.fi"
 else  else
   bytesex=l    bytesex=l
   KERNAL="kernl16l.fi kernl16b.fi kernl32l.fi kernl32b.fi kernl64l.fi kernl64b.fi"    KERNEL="kernl16l.fi kernl16b.fi kernl32l.fi kernl32b.fi kernl64l.fi kernl64b.fi"
 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
   
   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.  dnl Checks for programs.
 AC_PROG_LN_S  AC_PROG_LN_S
 AC_PROG_INSTALL  AC_PROG_INSTALL
Line 153  dnl Checks for library functions Line 626  dnl Checks for library functions
 dnl This check is just for making later checks link with libm.  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  dnl using sin here is no good idea since it is built-into gcc and typechecked
 AC_CHECK_LIB(m,asin)  AC_CHECK_LIB(m,asin)
 AC_FUNC_MEMCMP  AC_CHECK_LIB(dl,dlopen)
 AC_REPLACE_FUNCS(memmove strtoul pow10 strerror strsignal)  dnl check for libffi 2.x
 AC_CHECK_FUNCS(sys_siglist)  AC_CHECK_LIB(ffi,ffi_call)
 AC_MSG_CHECKING(whether sys_siglist may be declared)  if test $ac_cv_lib_ffi_ffi_call = yes
 AC_CACHE_VAL(gf_cv_declare_sys_siglist,  
 AC_TRY_COMPILE(#include <stdio.h>  
 #include <signal.h>  
 ,extern void sys_siglist;,gf_cv_declare_sys_siglist='yes',gf_cv_declare_sys_siglist='no'))  
 if test $gf_cv_declare_sys_siglist = yes  
 then  then
   AC_DEFINE(DECLARE_SYS_SIGLIST)  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 $ac_cv_lib_avcall___builtin_avcall = no && AC_DEFINE(HAS_OLDCALL,,[define this if you want to use the old call libraries])
 fi  fi
 AC_MSG_RESULT($gf_cv_declare_sys_siglist)  AC_SUBST(LIBFFIFLAG)
 AC_CHECK_FUNC(getopt_long,getopt_long="",getopt_long="getopt.o getopt1.o")  AC_SUBST(FFCALLFLAG)
 AC_SUBST(getopt_long)  AC_SUBST(OLDCALLFLAG)
 AC_CHECK_FUNCS(rint expm1 log1p)  if test "$host_os" != "nextstep3"
 AC_REPLACE_FUNCS(ecvt)  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)
   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 No check for select, because our replacement is no good under
 dnl anything but DOS  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${wordsize}${bytesex}.fi
   AC_SUBST(kernel_fi)
   
   #this breaks bindists
   #dnl replace srource directory by absolute value
   #if test $srcdir = "."; then srcdir=`pwd` 
   #fi
   
 kernal_fi=kernl${wordsize}${bytesex}.fi  AC_SUBST(machine)
 AC_SUBST(kernal_fi)  AC_CONFIG_FILES([
   Makefile
 AC_LINK_FILES(${mach_h}.h $kernal_fi,machine.h kernal.fi)  Makedist
 AC_OUTPUT(Makefile,echo timestamp > stamp-h)  gforthmi
   vmgen
   machpc.fs
   engine/Makefile
   doc/version.texi ])
   AC_CONFIG_COMMANDS([stamp-h],[[echo timestamp > stamp-h
   chmod +x gforthmi
   chmod +x vmgen
   test -d kernel||mkdir kernel]],[[]])
   AC_OUTPUT
   

Removed from v.1.18  
changed lines
  Added in v.1.156


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