File:  [gforth] / gforth / configure.in
Revision 1.169: download - view: text, annotated - select for diffs
Fri Feb 9 17:53:54 2007 UTC (12 years, 7 months ago) by anton
Branches: MAIN
CVS tags: HEAD
eliminated GNU-m4-specific usage

    1: dnl Process this file with autoconf to produce a configure script.
    2: 
    3: #Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006 Free Software Foundation, Inc.
    4: 
    5: #This file is part of Gforth.
    6: 
    7: #Gforth is free software; you can redistribute it and/or
    8: #modify it under the terms of the GNU General Public License
    9: #as published by the Free Software Foundation; either version 2
   10: #of the License, or (at your option) any later version.
   11: 
   12: #This program is distributed in the hope that it will be useful,
   13: #but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: #MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.#See the
   15: #GNU General Public License for more details.
   16: 
   17: #You should have received a copy of the GNU General Public License
   18: #along with this program; if not, write to the Free Software
   19: #Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: 
   22: dnl We use some automake macros here,
   23: dnl but don't use automake for creating Makefile.in
   24: AC_INIT([gforth],[0.6.2-20060527],[https://savannah.gnu.org/bugs/?func=addbug&group=gforth])
   25: AC_PREREQ(2.54)
   26: #snapshots have numbers major.minor.release-YYYYMMDD
   27: #note that lexicographic ordering must be heeded.
   28: #I.e., 0.4.1-YYYYMMDD must not exist before 0.4.1!
   29: UPDATED="April 09, 2006"
   30: AC_SUBST(UPDATED)
   31: AC_CONFIG_HEADERS(engine/config.h)
   32: 
   33: #suppress the "-g -O2" default
   34: test "$CFLAGS" || CFLAGS=-O2
   35: 
   36: AC_ARG_ENABLE(force-reg,
   37: 	AC_HELP_STRING([--enable-force-reg],
   38: 		        [ Use explicit register declarations if they appear in
   39: 			  the machine.h file. This can cause a good speedup,
   40: 			  but also incorrect code with some gcc versions on
   41: 			  some processors (default disabled).]),
   42: 	,enable_force_reg=no)
   43: test "$enable_force_reg" = "no"||
   44:   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)])
   45: 
   46: AC_ARG_ENABLE(force-ll,
   47: 	AC_HELP_STRING([--enable-force-ll],
   48: 		       [  Use explicit long long declarations if they appear in
   49: 			  the machine.h file. This can cause a good speedup,
   50: 			  but also incorrect code with some gcc versions on
   51: 			  some processors (default disabled).]),
   52: 	,enable_force_ll=no)
   53: test "$enable_force_ll" = "no"||
   54:   AC_DEFINE(FORCE_LL,,[Define if you want to use explicit long long declarations for better performance (does not work with all GCC versions on all machines)])
   55: 
   56: AC_ARG_ENABLE(gcc-pr15242-workaround,
   57:               AC_HELP_STRING([--disable-gcc-pr15242-workaround],[Disables
   58:                              dynamic code generation on some versions of gcc
   59:                              (slowdown~2 on Athlon) and causes slower building
   60:                              of gforth (but gforth speedups) on others.
   61:                              (default enabled)]),
   62: 		,enable_gcc_pr15242_workaround=yes)
   63: test "$enable_gcc_pr15242_workaround" = "no"||
   64: AC_DEFINE(GCC_PR15242_WORKAROUND,,[Define if you want to get dynamic code
   65: generation on gccs affected by PR15242])
   66: 
   67: AC_ARG_ENABLE(force-cdiv,
   68: 	AC_HELP_STRING([--enable-force-cdiv],
   69: 		       [  Use the native C division - symmetric - instead of
   70: 		          floored division (default disabled).]),
   71: 	,enable_force_cdiv=no)
   72: test "$enable_force_cdiv" = "no"||
   73:   AC_DEFINE(FORCE_CDIV,,[Define if you want to use explicit symmetric division for better performance])
   74: 
   75: AC_SUBST(PROFEXES)
   76: AC_SUBST(PROFOBJS)
   77: AC_ARG_ENABLE(prof,
   78: 	AC_HELP_STRING([--enable-prof],
   79: 			[ Build gforth-prof, which outputs frequently occuring
   80:                           sequences of primitives.]),
   81: 	,enable_prof=no)
   82: if test "$enable_prof" = "no"; then
   83:   PROFEXES="gforth-prof\$(EXE)"; PROFOBJS="engine-prof.o main-prof.o profile.o"
   84: fi
   85: 
   86: AC_ARG_WITH(debug,
   87: [  --with-debug		  specifies option -g to compile with debug info
   88:   --without-debug	  omits the -g switch and creates smaller images on
   89: 			  machines where "strip" has problems with gcc style
   90: 			  debugging informations.],
   91: if test "$withval" = "yes"; then DEBUGFLAG=-g; fi)
   92: 
   93: dnl PEEPHOLE="yes"
   94: dnl AC_ARG_WITH(peephole,
   95: dnl [  --with-peephole	Enable peephole optimization (default)
   96: dnl   --without-peephole	disables peephole optimization. Creates smaller,
   97: dnl 			but slower images.],
   98: dnl PEEPHOLE="$withval")
   99: 
  100: AC_ARG_ENABLE(ec,
  101: 	AC_HELP_STRING([--enable-ec],
  102: 			[  Build gforth for systems without OS.]),
  103: 	,enable_ec=no)
  104: if test "$enable_ec" = "yes"; then
  105:   echo "defining standalone system"
  106:   AC_DEFINE(STANDALONE,,[Define if you want a Gforth without OS])
  107:   EC_MODE="true"
  108: else
  109:   echo "defining hosted system"
  110:   EC_MODE="false"
  111: fi
  112: 
  113: #variables mentioned in INSTALL
  114: AC_ARG_VAR(CC, [The C compiler (must support GNU C 2.x); gcc-2.95 recommended.])
  115: AC_ARG_VAR(FORTHSIZES, [Gforth command line options for the default stack and dictionary sizes (see INSTALL).])
  116: AC_ARG_VAR(STACK_CACHE_DEFAULT_FAST, [number of registers in the default stack cache state for gforth-fast and gforth-native (default 1).])
  117: AC_ARG_VAR(ac_cv_sizeof_char_p, [sizeof(char *)])
  118: AC_ARG_VAR(ac_cv_sizeof_char, [sizeof(char)])
  119: AC_ARG_VAR(ac_cv_sizeof_short, [sizeof(short)])
  120: AC_ARG_VAR(ac_cv_sizeof_int, [sizeof(int)])
  121: AC_ARG_VAR(ac_cv_sizeof_long, [sizeof(long)])
  122: AC_ARG_VAR(ac_cv_sizeof_long_long, [sizeof(long long)])
  123: AC_ARG_VAR(ac_cv_sizeof_intptr_t, [sizeof(intptr_t)])
  124: AC_ARG_VAR(ac_cv_sizeof_int128_t, [sizeof(int128_t)])
  125: AC_ARG_VAR(ac_cv_sizeof_uint128_t, [sizeof(uint128_t)])
  126: AC_ARG_VAR(ac_cv_c_bigendian, [Is the target big-endian ("yes" or "no")?])
  127: AC_ARG_VAR(no_dynamic_default, [run gforth with --dynamic (0) or --no-dynamic (1) by default])
  128: AC_ARG_VAR(skipcode, [assembly code for skipping 16 bytes of code])
  129: 
  130: #set up feature test macros, so the tests get them right:
  131: # turn on all POSIX, SUSv3, and GNU features if available
  132: AC_GNU_SOURCE
  133: dnl AC_DEFINE_UNQUOTED([_GNU_SOURCE],1,[feature test macro])
  134: 
  135: dnl Don't define _POSIX_SOURCE etc. because some OSs (in particular
  136: dnl MacOSX) disable some features then (MacOSX checks for _POSIX_SOURCE,
  137: dnl but not for _XOPEN_SOURCE)
  138: dnl AC_DEFINE_UNQUOTED([_POSIX_SOURCE],1,[feature test macro])
  139: dnl AC_DEFINE_UNQUOTED([_POSIX_C_SOURCE],199506L,[feature test macro])
  140: dnl AC_DEFINE_UNQUOTED([_XOPEN_SOURCE],600,[feature test macro])
  141: # turn on large file support with 64-bit off_t where available
  142: AC_SYS_LARGEFILE
  143: dnl AC_DEFINE_UNQUOTED([_LARGEFILE_SOURCE],1,[feature test macro])
  144: dnl AC_DEFINE_UNQUOTED([_FILE_OFFSET_BITS],64,[feature test macro])
  145: 
  146: #currently we force direct threading this way.  Eventually we should
  147: #setup in the arch and engine files right
  148: 
  149: AC_PROG_CC
  150: 
  151: test "$GCC" = "yes" || AC_MSG_ERROR(Gforth uses GNU C extensions and requires GCC 2.0 or higher)
  152: 
  153: AC_SUBST(CC)
  154: AC_SUBST(DEBUGFLAG)
  155: AC_SUBST(EC_MODE)
  156: 
  157: AC_MSG_CHECKING(make type)
  158: make_type=`make -v 2>&1|grep 'ake'|sed 's/ake .*/ake/'`
  159: 
  160: GNUMAKE='#'
  161: test "$make_type" = "GNU Make" && GNUMAKE=''
  162: 
  163: AC_MSG_RESULT($make_type)
  164: 
  165: AC_SUBST(GNUMAKE)
  166: 
  167: AC_MSG_CHECKING([whether the linker accepts -export-dynamic])
  168: OLDLDFLAGS=$LDFLAGS
  169: LDFLAGS="$LDFLAGS -export-dynamic"
  170: dnl AC_TRY_LINK gives false positive on rs6000-ibm-aix4.2.1.0
  171: dnl AC_TRY_LINK(,,ac_export_dynamic=yes,ac_export_dynamic=no)
  172: AC_TRY_RUN(main(){exit(0);},ac_export_dynamic=yes,ac_export_dynamic=no,ac_export_dynamic=no)
  173: test $ac_export_dynamic = yes|| LDFLAGS=$OLDLDFLAGS
  174: AC_MSG_RESULT($ac_export_dynamic)
  175: 
  176: #terminology is a bit unusual here: The host is the system on which
  177: #gforth will run; the system on which configure will run is the `build'
  178: AC_CANONICAL_HOST
  179: case "$host_cpu" in
  180: 	arm*)
  181: 		machine=arm
  182: 		CFLAGS="$CFLAGS -fomit-frame-pointer"
  183: 		if test -z $no_dynamic_default; then
  184: 		    no_dynamic_default=1
  185: 		    AC_MSG_WARN([No I-cache flush code known, disabling dynamic native code generation])
  186: 		fi
  187: 		;;
  188: 	hppa*)
  189: 		machine=hppa
  190: 		$srcdir/mkinstalldirs arch/hppa
  191: 		AC_LIBOBJ(../arch/hppa/cache)
  192: 		#-N needed for --dynamic <M4U3b.3790$9d.317@news.cpqcorp.net>
  193: 		LDFLAGS="$LDFLAGS -Xlinker -N"
  194: 		LIBS="$LIBS -L/lib/pa1.1/"
  195: 		;;
  196: 	sparc*)
  197: 		machine=sparc
  198: 		;;
  199: 	i386)
  200: 		machine=386
  201: 		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem"
  202: 		;;
  203: 	i486)
  204: 		machine=386
  205: 		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem -m486"
  206: 		;;
  207: 	i*86)
  208: 		machine=386
  209: 		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem"
  210: 		CFLAGS_1="$CFLAGS"
  211: 		CFLAGS="$CFLAGS -march=pentium"
  212: 		AC_TRY_COMPILE(,,,CFLAGS="$CFLAGS_1 -m486")
  213: 		;;
  214: 	x86_64)
  215: 		machine=amd64
  216: 		;;
  217: 	ia64*)
  218: 		machine=ia64
  219: 		AC_LIBOBJ(../arch/ia64/flush_icache_block)
  220: 		test "$skipcode" || skipcode="nop.i 0"
  221: 		#".skip 16" passes the test below,
  222: 		# but gives an assembler error in engine
  223: 		;;
  224:         m68k)
  225: 		machine=m68k
  226: 		CFLAGS="$CFLAGS -fomit-frame-pointer"
  227: 		if test "$host_os" = "nextstep3"
  228: 		then
  229: 			AC_LIBOBJ(termios)
  230: 		fi
  231: 		;;
  232: 	mips*)
  233: 		machine=mips
  234: 		#dynamic native code has the following problems on MIPS:
  235: 		#
  236: 		#1) J/JAL seems relocatable, but is are only
  237: 		#relocatable within a 256MB-segment.  While we try to
  238: 		#get the linker to arrange this, there is no guarantee
  239: 		#that this will succeed (and if the user uses a lot of
  240: 		#memory, it is likely to fail).
  241: 		#
  242: 		#2) The way we generate dynamic native code may
  243: 		#violate MIPS architectural restrictions (in
  244: 		#particular, the delay slots of LW, MFLO, etc.)
  245: 		#
  246: 		#Therefore we disable dynamic native code by default:
  247: 		if test -z $no_dynamic_default; then
  248: 		    no_dynamic_default=1
  249: 		    AC_MSG_WARN([Disabling default dynamic native code generation (relocation and delay slot issues)])
  250: 		fi
  251: 		;;
  252: 	alpha*)
  253: 		machine=alpha
  254: 		#full IEEE FP support for more uniformity across platforms:
  255: 		CFLAGS="$CFLAGS -mieee"
  256: 		;;
  257: 	power*|rs6000)
  258: 		machine=power
  259: 		$srcdir/mkinstalldirs arch/power
  260: 		AC_CHECK_FUNC(_sync_cache_range,[true],[AC_LIBOBJ(../arch/power/_sync_cache_range)])
  261: 		#long long is broken on (at least) gcc-2.95.* for PPC
  262: 		test x$ac_cv_sizeof_long_long = x && 
  263: 		($CC -v 2>&1 |grep -q 'gcc version 2.95') &&
  264: 		ac_cv_sizeof_long_long=0
  265: 		;;
  266: 	*)
  267: 		AC_MSG_WARN([Using a generic machine description])
  268: 		AC_MSG_WARN([Assuming C floats and doubles are IEEE floats and doubles (for SF@ DF@ SF! DF!)])
  269: 		AC_MSG_WARN([FLUSH-ICACHE will do nothing, so END-CODE may not work properly!])
  270: 		machine=generic
  271: 		#I-cache flushing would be needed for dynamic code generation
  272: 		if test -z $no_dynamic_default; then
  273: 		    no_dynamic_default=1
  274: 		    AC_MSG_WARN([No I-cache flush code known, disabling dynamic native code generation])
  275: 		fi
  276: esac
  277: AC_SUBST(host)
  278: 
  279: test x$STACK_CACHE_DEFAULT_FAST = x && STACK_CACHE_DEFAULT_FAST=1
  280: AC_DEFINE_UNQUOTED(STACK_CACHE_DEFAULT_FAST, $STACK_CACHE_DEFAULT_FAST,
  281: 		   [number of registers in the default stack cache state for gforth-fast and gforth-native])
  282: 
  283: if test "${enable_force_ll+set}" = set; then
  284:    ac_includes_default="$ac_includes_default
  285: #include \"arch/generic/128bit.h\""
  286: fi
  287: 
  288: dnl the following macro produces a warning with autoconf-2.1
  289: AC_CHECK_SIZEOF(char *)
  290: case "$ac_cv_sizeof_char_p" in
  291:   2)
  292:     wordsize=16
  293:     ;;
  294:   4)
  295:     wordsize=32
  296:     ;;
  297:   8)
  298:     wordsize=64
  299:     ;;
  300: esac
  301: 
  302: AC_CHECK_SIZEOF(char)
  303: AC_CHECK_SIZEOF(short)
  304: AC_CHECK_SIZEOF(int)
  305: AC_CHECK_SIZEOF(long)
  306: AC_CHECK_SIZEOF(long long)
  307: AC_CHECK_SIZEOF(intptr_t)
  308: AC_CHECK_SIZEOF(int128_t)
  309: AC_CHECK_SIZEOF(uint128_t)
  310: 
  311: AC_MSG_CHECKING([for a C type for cells])
  312: ac_cv_int_type_cell=none
  313: case "$ac_cv_sizeof_char_p" in
  314:   $ac_cv_sizeof_int)
  315:     ac_cv_int_type_cell=int
  316:     ;;
  317:   $ac_cv_sizeof_short)
  318:     ac_cv_int_type_cell=short
  319:     ;;
  320:   $ac_cv_sizeof_char)
  321:     ac_cv_int_type_cell=char
  322:     ;;
  323:   $ac_cv_sizeof_long)
  324:     ac_cv_int_type_cell=long
  325:     ;;
  326:   $ac_cv_sizeof_long_long)
  327:     ac_cv_int_type_cell="long long"
  328:     ;;
  329:   $ac_cv_sizeof_intptr_t)
  330:     ac_cv_int_type_cell="intptr_t"
  331:     ;;
  332:   $ac_cv_sizeof_int128_t)
  333:     ac_cv_int_type_cell="int128_t"
  334:     ;;
  335: esac
  336: AC_MSG_RESULT($ac_cv_int_type_cell)
  337: AC_DEFINE_UNQUOTED(CELL_TYPE,$ac_cv_int_type_cell,[an integer type that is as long as a pointer])
  338: 
  339: AC_MSG_CHECKING([for a C type for wydes])
  340: ac_cv_wyde_type_cell=none
  341: case 2 in
  342:   $ac_cv_sizeof_int)
  343:     ac_cv_wyde_type_cell=int
  344:     ;;
  345:   $ac_cv_sizeof_short)
  346:     ac_cv_wyde_type_cell=short
  347:     ;;
  348:   $ac_cv_sizeof_char)
  349:     ac_cv_wyde_type_cell=char
  350:     ;;
  351:   $ac_cv_sizeof_long)
  352:     ac_cv_wyde_type_cell=long
  353:     ;;
  354:   $ac_cv_sizeof_long_long)
  355:     ac_cv_wyde_type_cell="long long"
  356:     ;;
  357:   $ac_cv_sizeof_intptr_t)
  358:     ac_cv_wyde_type_cell="intptr_t"
  359:     ;;
  360:   $ac_cv_sizeof_int128_t)
  361:     ac_cv_wyde_type_cell="int128_t"
  362:     ;;
  363: esac
  364: AC_MSG_RESULT($ac_cv_wyde_type_cell)
  365: AC_DEFINE_UNQUOTED(WYDE_TYPE,$ac_cv_wyde_type_cell,[an integer type that is 2 bytes long])
  366: 
  367: AC_MSG_CHECKING([for a C type for tetrabytes])
  368: ac_cv_tetrabyte_type_cell=none
  369: case 4 in
  370:   $ac_cv_sizeof_int)
  371:     ac_cv_tetrabyte_type_cell=int
  372:     ;;
  373:   $ac_cv_sizeof_short)
  374:     ac_cv_tetrabyte_type_cell=short
  375:     ;;
  376:   $ac_cv_sizeof_char)
  377:     ac_cv_tetrabyte_type_cell=char
  378:     ;;
  379:   $ac_cv_sizeof_long)
  380:     ac_cv_tetrabyte_type_cell=long
  381:     ;;
  382:   $ac_cv_sizeof_long_long)
  383:     ac_cv_tetrabyte_type_cell="long long"
  384:     ;;
  385:   $ac_cv_sizeof_intptr_t)
  386:     ac_cv_tetrabyte_type_cell="intptr_t"
  387:     ;;
  388:   $ac_cv_sizeof_int128_t)
  389:     ac_cv_tetrabyte_type_cell="int128_t"
  390:     ;;
  391: esac
  392: AC_MSG_RESULT($ac_cv_tetrabyte_type_cell)
  393: AC_DEFINE_UNQUOTED(TETRABYTE_TYPE,$ac_cv_tetrabyte_type_cell,[an integer type that is 4 bytes long])
  394: 
  395: AC_MSG_CHECKING([for a C type for double-cells])
  396: ac_cv_int_type_double_cell=none
  397: case `expr 2 '*' "$ac_cv_sizeof_char_p"` in
  398:   $ac_cv_sizeof_short)
  399:     ac_cv_int_type_double_cell=short
  400:     ;;
  401:   $ac_cv_sizeof_int)
  402:     ac_cv_int_type_double_cell=int
  403:     ;;
  404:   $ac_cv_sizeof_long)
  405:     ac_cv_int_type_double_cell=long
  406:     ;;
  407:   $ac_cv_sizeof_long_long)
  408:     ac_cv_int_type_double_cell="long long"
  409:     ;;
  410:   $ac_cv_sizeof_intptr_t)
  411:     ac_cv_int_type_double_cell="intptr_t"
  412:     ;;
  413:   $ac_cv_sizeof_int128_t)
  414:     ac_cv_int_type_double_cell="int128_t"
  415:     ;;
  416: esac
  417: AC_MSG_RESULT($ac_cv_int_type_double_cell)
  418: 
  419: AC_MSG_CHECKING([for a C type for unsigned double-cells])
  420: ac_cv_int_type_double_ucell=none
  421: case `expr 2 '*' "$ac_cv_sizeof_char_p"` in
  422:   $ac_cv_sizeof_short)
  423:     ac_cv_int_type_double_ucell="unsigned short"
  424:     ;;
  425:   $ac_cv_sizeof_int)
  426:     ac_cv_int_type_double_ucell="unsigned int"
  427:     ;;
  428:   $ac_cv_sizeof_long)
  429:     ac_cv_int_type_double_ucell="unsigned long"
  430:     ;;
  431:   $ac_cv_sizeof_long_long)
  432:     ac_cv_int_type_double_ucell="unsigned long long"
  433:     ;;
  434:   $ac_cv_sizeof_intptr_t)
  435:     ac_cv_int_type_double_ucell="unsigned intptr_t"
  436:     ;;
  437:   $ac_cv_sizeof_uint128_t)
  438:     ac_cv_int_type_double_ucell="uint128_t"
  439:     ;;
  440: esac
  441: AC_MSG_RESULT($ac_cv_int_type_double_ucell)
  442: 
  443: if test "$ac_cv_int_type_double_cell" = none || \
  444:    test "$ac_cv_int_type_double_ucell" = none
  445: then
  446: 	AC_MSG_WARN([Emulating double-cell arithmetic. This may be slow.])
  447: 	AC_LIBOBJ(dblsub)
  448: 	AC_DEFINE(BUGGY_LONG_LONG,,[define this if there is no working DOUBLE_CELL_TYPE on your machine])
  449: else
  450: 	AC_DEFINE_UNQUOTED(DOUBLE_CELL_TYPE,$ac_cv_int_type_double_cell,[an integer type that is twice as long as a pointer])
  451: 	AC_DEFINE_UNQUOTED(DOUBLE_UCELL_TYPE,$ac_cv_int_type_double_ucell,[an unsigned integer type that is twice as long as a pointer])
  452: fi
  453: 
  454: AC_TYPE_OFF_T
  455: AC_CHECK_SIZEOF(off_t)
  456: test $ac_cv_sizeof_off_t -gt $ac_cv_sizeof_char_p
  457: ac_small_off_t=$?
  458: AC_DEFINE_UNQUOTED(SMALL_OFF_T,$ac_small_off_t,[1 if off_t fits in a Cell])
  459: 
  460: ENGINE_FLAGS=
  461: AC_SUBST(ENGINE_FLAGS)
  462: 
  463: # Try if GCC understands -fno-gcse
  464: 
  465: AC_MSG_CHECKING([if $CC understands -fno-gcse])
  466: CFLAGS_1="$CFLAGS"
  467: CFLAGS="$CFLAGS -fno-gcse"
  468: AC_TRY_COMPILE(,,ac_nogcse=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-gcse",ac_nogcse=no)
  469: CFLAGS="$CFLAGS_1"
  470: AC_MSG_RESULT($ac_nogcse)
  471: 
  472: # Try if GCC understands -fno-strict-aliasing
  473: AC_MSG_CHECKING([if $CC understands -fno-strict-aliasing])
  474: CFLAGS_1="$CFLAGS"
  475: CFLAGS="$CFLAGS -fno-strict-aliasing"
  476: AC_TRY_COMPILE(,,ac_nostrictaliasing=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-strict-aliasing",ac_nostrictaliasing=no)
  477: CFLAGS="$CFLAGS_1"
  478: AC_MSG_RESULT($ac_nostrictaliasing)
  479: 
  480: # Try if GCC understands -fno-crossjumping
  481: AC_MSG_CHECKING([if $CC understands -fno-crossjumping])
  482: CFLAGS_1="$CFLAGS"
  483: CFLAGS="$CFLAGS -fno-crossjumping"
  484: AC_TRY_COMPILE(,,ac_nocrossjumping=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-crossjumping",ac_nocrossjumping=no)
  485: CFLAGS="$CFLAGS_1"
  486: AC_MSG_RESULT($ac_nocrossjumping)
  487: 
  488: # Try if GCC understands -fno-reorder-blocks
  489: AC_MSG_CHECKING([if $CC understands -fno-reorder-blocks])
  490: CFLAGS_1="$CFLAGS"
  491: CFLAGS="$CFLAGS -fno-reorder-blocks"
  492: AC_TRY_COMPILE(,,ac_noreorder_blocks=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-reorder-blocks",ac_noreorder_blocks=no)
  493: CFLAGS="$CFLAGS_1"
  494: AC_MSG_RESULT($ac_noreorder_blocks)
  495: 
  496: # Try if GCC understands __attribute__((unused))
  497: AC_MSG_CHECKING([how to suppress 'unused variable' warnings])
  498: AC_TRY_COMPILE(,[int __attribute__((unused)) foo;], MAYBE_UNUSED='__attribute__((unused))',)
  499: AC_DEFINE_UNQUOTED(MAYBE_UNUSED,$MAYBE_UNUSED,[attribute for possibly unused variables])
  500: AC_MSG_RESULT($MAYBE_UNUSED)
  501: 
  502: AC_CHECK_PROG(asm_fs,asm.fs,arch/$machine/asm.fs,,$srcdir/arch/$machine)
  503: AC_SUBST(asm_fs)
  504: 
  505: AC_CHECK_PROG(disasm_fs,disasm.fs,arch/$machine/disasm.fs,,$srcdir/arch/$machine)
  506: AC_SUBST(disasm_fs)
  507: 
  508: AC_PATH_PROG(INSTALL_INFO,install-info,[echo '>>>>Please make info dir entry:'],$PATH:/sbin:/usr/sbin:/usr/local/sbin)
  509: 
  510: case "$host_os" in
  511: 	*win32*)
  512: 		# !!!FIXME!!! problems with cygwin and ';' as path separator
  513: 		DIRSEP="\\\\"
  514: 		PATHSEP=";"
  515: 		#we want the builtins of command.com/cmd.exe and its
  516: 		# handling of .com files.
  517: 		#$COMSPEC contains the name of the Windows shell;
  518: 		# the ./ is there, because the bash does not recognize
  519: 		# absolute DOS filenames
  520: 		DEFAULTSYSTEMPREFIX="./$COMSPEC /c "
  521: 		;;
  522: 	*darwin*)
  523: 		#Darwin uses some funny preprocessor by default; eliminate it:
  524: 		AC_MSG_NOTICE([using -no-cpp-precomp on Darwin])
  525: 		CFLAGS="$CFLAGS -no-cpp-precomp"
  526: 		DIRSEP="/"
  527: 		PATHSEP=":"
  528: 		DEFAULTSYSTEMPREFIX=""
  529: 		;;
  530: 	*)
  531: 		DIRSEP="/"
  532: 		PATHSEP=":"
  533: 		DEFAULTSYSTEMPREFIX=""
  534: 		;;
  535: esac
  536: AC_SUBST(DIRSEP)
  537: AC_DEFINE_UNQUOTED(DIRSEP,'$DIRSEP',[a directory separator character])
  538: AC_SUBST(PATHSEP)
  539: AC_DEFINE_UNQUOTED(PATHSEP,'$PATHSEP',[a path separator character])
  540: AC_SUBST(DEFAULTSYSTEMPREFIX)
  541: AC_DEFINE_UNQUOTED(DEFAULTSYSTEMPREFIX,"$DEFAULTSYSTEMPREFIX",[default for environment variable GFORTHSYSTEMPREFIX])
  542: 
  543: dnl Now a little support for DOS/DJGCC
  544: AC_SUBST(GFORTH_EXE)
  545: GFORTH_EXE=""
  546: AC_SUBST(GFORTHFAST_EXE)
  547: GFORTHFAST_EXE=""
  548: AC_SUBST(GFORTHITC_EXE)
  549: GFORTHITC_EXE=""
  550: AC_SUBST(GFORTHDITC_EXE)
  551: GFORTHDITC_EXE=""
  552: 
  553: AC_SUBST(FORTHSIZES)
  554: 
  555: dnl if test "$PEEPHOLE" = "yes"
  556: dnl then
  557: dnl    PEEPHOLEFLAG="true"
  558: dnl    AC_DEFINE(HAS_PEEPHOLE,,[Define if you want to use peephole optimization])
  559: dnl else
  560: dnl    PEEPHOLEFLAG="false"
  561: dnl fi
  562: PEEPHOLEFLAG="true"
  563: AC_SUBST(PEEPHOLEFLAG)
  564: 
  565: dnl copy commands for systems that don't have links
  566: AC_SUBST(LINK_KERNL)
  567: LINK_KERNL=""
  568: 
  569: #if test $host_os=dos
  570: #then
  571: #  echo Configuring for DOS!!!
  572: #  MAKE_EXE="coff2exe gforth"
  573: #  LINK_KERNL='$(CP) kernl32l.fi kernel.fi'
  574: #fi
  575: 
  576: dnl the following macro produces a warning with autoconf-2.1
  577: AC_C_BIGENDIAN
  578: AC_SUBST(KERNEL)
  579: dnl ac_cv_c_bigendian is an undocumented variable of autoconf-2.1
  580: if test $ac_cv_c_bigendian = yes; then
  581:   bytesex=b
  582:   KERNEL="kernl16b.fi kernl16l.fi kernl32b.fi kernl32l.fi kernl64b.fi kernl64l.fi"
  583: else
  584:   bytesex=l
  585:   KERNEL="kernl16l.fi kernl16b.fi kernl32l.fi kernl32b.fi kernl64l.fi kernl64b.fi"
  586: fi
  587: 
  588: #check how to do asm(".skip 16")
  589: #echo "CFLAGS=$CFLAGS"
  590: #echo "ac_link=$ac_link"
  591: AC_MSG_CHECKING([if and how we can waste code space])
  592: if test -z "$skipcode"; then
  593:     skipcode=no
  594:     CFLAGS_1="$CFLAGS"
  595:     CFLAGS="$CFLAGS $ENGINE_FLAGS"
  596:     for i in ".skip 16" ".block 16" ".org .+16" ".=.+16" ".space 16"
  597:     do
  598: 	AC_TRY_RUN(
  599: [int foo(int,int,int);
  600: main()
  601: {
  602:   exit(foo(0,0,0)!=16);
  603: }
  604: int foo(int x, int y, int z)
  605: {
  606:   static void *labels[]={&&label1, &&label2};
  607:   if (x) {
  608:     y++; /* workaround for http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12108 */
  609:   label1:
  610:     asm("$i"); /* or ".space 16" or somesuch */
  611:   label2: ;
  612:   }
  613:   {
  614:   if (y) goto *labels[z]; /* workaround for gcc PR12108 */
  615:   return labels[1]-labels[0];
  616:   }
  617: }]
  618: 	,skipcode=$i; break
  619: 	,,)
  620:     done
  621:     CFLAGS=$CFLAGS_1
  622: fi
  623: AC_MSG_RESULT($skipcode)
  624: if test "$skipcode" = no
  625: then 
  626:     if test -z $no_dynamic_default; then
  627: 	no_dynamic_default=1
  628: 	AC_MSG_WARN(Disabling default dynamic native code generation)
  629:     fi
  630:     AC_DEFINE_UNQUOTED(SKIP16,((void)0),statement for skipping 16 bytes)
  631: else
  632:     AC_DEFINE_UNQUOTED(SKIP16,asm("$skipcode"),statement for skipping 16 bytes)
  633: fi
  634: 
  635: test "$no_dynamic_default" || no_dynamic_default=0
  636: AC_DEFINE_UNQUOTED(NO_DYNAMIC_DEFAULT,$no_dynamic_default,default value for no_dynamic)
  637: 
  638: dnl Checks for programs.
  639: AC_PROG_LN_S
  640: AC_PROG_INSTALL
  641: AC_CHECK_PROGS(TEXI2DVI,texi2dvi4a2ps texi2dvi)
  642: 
  643: dnl Checks for library functions
  644: dnl This check is just for making later checks link with libm.
  645: dnl using sin here is no good idea since it is built-into gcc and typechecked
  646: AC_CHECK_LIB(m,asin)
  647: AC_CHECK_LIB(dl,dlopen)
  648: dnl check for libffi 2.x
  649: AC_CHECK_LIB(ffi,ffi_call)
  650: if test $ac_cv_lib_ffi_ffi_call = yes
  651: then
  652: LIBFFIFLAG="true"
  653: FFCALLFLAG="false"
  654: OLDCALLFLAG="false"
  655: AC_DEFINE(HAS_LIBFFI,,[define this if you want to use the ffcall interface with libffi 2.0])
  656: else
  657: dnl check for ffcall libraries
  658: dnl unfortunately, these four calls are separated out into a library each.
  659: AC_CHECK_LIB(avcall,__builtin_avcall)
  660: AC_CHECK_LIB(callback,__vacall_r)
  661: AC_CHECK_LIB(vacall,vacall)
  662: AC_CHECK_LIB(trampoline,alloc_trampoline)
  663: LIBFFIFLAG="false"
  664: FFCALLFLAG="false"
  665: OLDCALLFLAG="true"
  666: 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])
  667: test $ac_cv_lib_avcall___builtin_avcall = no && AC_DEFINE(HAS_OLDCALL,,[define this if you want to use the old call libraries])
  668: fi
  669: AC_SUBST(LIBFFIFLAG)
  670: AC_SUBST(FFCALLFLAG)
  671: AC_SUBST(OLDCALLFLAG)
  672: if test "$host_os" != "nextstep3"
  673: then
  674: 	AC_FUNC_MEMCMP
  675: fi
  676: AC_REPLACE_FUNCS(memmove strtoul pow10 strerror strsignal atanh)
  677: AC_FUNC_FSEEKO
  678: AC_CHECK_FUNCS(ftello dlopen sys_siglist getrusage)
  679: AC_CHECK_TYPES(stack_t,,,[#include <signal.h>])
  680: AC_DECL_SYS_SIGLIST
  681: AC_CHECK_FUNC(getopt_long,[true],[AC_LIBOBJ(getopt) AC_LIBOBJ(getopt1)])
  682: AC_CHECK_FUNCS(expm1 log1p)
  683: AC_REPLACE_FUNCS(rint ecvt)
  684: dnl No check for select, because our replacement is no good under
  685: dnl anything but DOS
  686: AC_CHECK_HEADERS(sys/mman.h fnmatch.h)
  687: AC_FUNC_FNMATCH
  688: test $ac_cv_func_fnmatch_works = yes || AC_LIBOBJ(fnmatch)
  689: AC_CHECK_FUNCS(mmap sysconf getpagesize)
  690: AM_PATH_LISPDIR
  691: 
  692: kernel_fi=kernl${wordsize}${bytesex}.fi
  693: AC_SUBST(kernel_fi)
  694: 
  695: #this breaks bindists
  696: #dnl replace srource directory by absolute value
  697: #if test $srcdir = "."; then srcdir=`pwd` 
  698: #fi
  699: 
  700: AC_SUBST(machine)
  701: AC_CONFIG_FILES([
  702: Makefile
  703: Makedist
  704: gforthmi
  705: vmgen
  706: machpc.fs
  707: envos.fs
  708: engine/Makefile
  709: doc/version.texi
  710: build-ec ])
  711: AC_CONFIG_COMMANDS([stamp-h],[[echo timestamp > stamp-h
  712: chmod +x gforthmi
  713: chmod +x vmgen
  714: chmod +x build-ec
  715: test -d kernel||mkdir kernel]],[[]])
  716: AC_OUTPUT
  717: 

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