File:  [gforth] / gforth / configure.in
Revision 1.173: download - view: text, annotated - select for diffs
Mon Feb 26 19:07:05 2007 UTC (12 years, 9 months ago) by anton
Branches: MAIN
CVS tags: HEAD
GCC_PR15242_WORKAROUND is now a configure variable, not an option
default is now to use the workaround for gcc-3.x, but not for other gccs

    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 "$enable_force_ll" = "no"||
   54:   AC_DEFINE(FORCE_LL,,[Define if you want to use explicit long long declarations for better performance (does not work with all GCC versions on all machines)])
   55: 
   56: AC_ARG_ENABLE(force-cdiv,
   57: 	AC_HELP_STRING([--enable-force-cdiv],
   58: 		       [  Use the native C division - symmetric - instead of
   59: 		          floored division (default disabled).]),
   60: 	,enable_force_cdiv=no)
   61: test "$enable_force_cdiv" = "no"||
   62:   AC_DEFINE(FORCE_CDIV,,[Define if you want to use explicit symmetric division for better performance])
   63: 
   64: AC_SUBST(PROFEXES)
   65: AC_SUBST(PROFOBJS)
   66: AC_ARG_ENABLE(prof,
   67: 	AC_HELP_STRING([--enable-prof],
   68: 			[ Build gforth-prof, which outputs frequently occuring
   69:                           sequences of primitives.]),
   70: 	,enable_prof=no)
   71: if test "$enable_prof" = "no"; then
   72:   PROFEXES="gforth-prof\$(EXE)"; PROFOBJS="engine-prof.o main-prof.o profile.o"
   73: fi
   74: 
   75: AC_ARG_WITH(debug,
   76: [  --with-debug		  specifies option -g to compile with debug info
   77:   --without-debug	  omits the -g switch and creates smaller images on
   78: 			  machines where "strip" has problems with gcc style
   79: 			  debugging informations.],
   80: if test "$withval" = "yes"; then DEBUGFLAG=-g; fi)
   81: 
   82: dnl PEEPHOLE="yes"
   83: dnl AC_ARG_WITH(peephole,
   84: dnl [  --with-peephole	Enable peephole optimization (default)
   85: dnl   --without-peephole	disables peephole optimization. Creates smaller,
   86: dnl 			but slower images.],
   87: dnl PEEPHOLE="$withval")
   88: 
   89: AC_ARG_ENABLE(ec,
   90: 	AC_HELP_STRING([--enable-ec],
   91: 			[  Build gforth for systems without OS.]),
   92: 	,enable_ec=no)
   93: if test "$enable_ec" = "yes"; then
   94:   echo "defining standalone system"
   95:   AC_DEFINE(STANDALONE,,[Define if you want a Gforth without OS])
   96:   EC_MODE="true"
   97: else
   98:   echo "defining hosted system"
   99:   EC_MODE="false"
  100: fi
  101: 
  102: #variables mentioned in INSTALL
  103: AC_ARG_VAR(CC, [The C compiler (must support GNU C 2.x); gcc-2.95 recommended.])
  104: AC_ARG_VAR(FORTHSIZES, [Gforth command line options for the default stack and dictionary sizes (see INSTALL).])
  105: AC_ARG_VAR(STACK_CACHE_DEFAULT_FAST, [number of registers in the default stack cache state for gforth-fast and gforth-native (default 1).])
  106: 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)])
  107: 
  108: AC_ARG_VAR(ac_cv_sizeof_char_p, [sizeof(char *)])
  109: AC_ARG_VAR(ac_cv_sizeof_char, [sizeof(char)])
  110: AC_ARG_VAR(ac_cv_sizeof_short, [sizeof(short)])
  111: AC_ARG_VAR(ac_cv_sizeof_int, [sizeof(int)])
  112: AC_ARG_VAR(ac_cv_sizeof_long, [sizeof(long)])
  113: AC_ARG_VAR(ac_cv_sizeof_long_long, [sizeof(long long)])
  114: AC_ARG_VAR(ac_cv_sizeof_intptr_t, [sizeof(intptr_t)])
  115: AC_ARG_VAR(ac_cv_sizeof_int128_t, [sizeof(int128_t)])
  116: AC_ARG_VAR(ac_cv_sizeof_uint128_t, [sizeof(uint128_t)])
  117: AC_ARG_VAR(ac_cv_c_bigendian, [Is the target big-endian ("yes" or "no")?])
  118: AC_ARG_VAR(no_dynamic_default, [run gforth with --dynamic (0) or --no-dynamic (1) by default])
  119: AC_ARG_VAR(skipcode, [assembly code for skipping 16 bytes of code])
  120: 
  121: #set up feature test macros, so the tests get them right:
  122: # turn on all POSIX, SUSv3, and GNU features if available
  123: AC_GNU_SOURCE
  124: dnl AC_DEFINE_UNQUOTED([_GNU_SOURCE],1,[feature test macro])
  125: 
  126: dnl Don't define _POSIX_SOURCE etc. because some OSs (in particular
  127: dnl MacOSX) disable some features then (MacOSX checks for _POSIX_SOURCE,
  128: dnl but not for _XOPEN_SOURCE)
  129: dnl AC_DEFINE_UNQUOTED([_POSIX_SOURCE],1,[feature test macro])
  130: dnl AC_DEFINE_UNQUOTED([_POSIX_C_SOURCE],199506L,[feature test macro])
  131: dnl AC_DEFINE_UNQUOTED([_XOPEN_SOURCE],600,[feature test macro])
  132: # turn on large file support with 64-bit off_t where available
  133: AC_SYS_LARGEFILE
  134: dnl AC_DEFINE_UNQUOTED([_LARGEFILE_SOURCE],1,[feature test macro])
  135: dnl AC_DEFINE_UNQUOTED([_FILE_OFFSET_BITS],64,[feature test macro])
  136: 
  137: #currently we force direct threading this way.  Eventually we should
  138: #setup in the arch and engine files right
  139: 
  140: AC_PROG_CC
  141: 
  142: test "$GCC" = "yes" || AC_MSG_ERROR(Gforth uses GNU C extensions and requires GCC 2.0 or higher)
  143: 
  144: AC_SUBST(CC)
  145: AC_SUBST(DEBUGFLAG)
  146: AC_SUBST(EC_MODE)
  147: 
  148: AC_MSG_CHECKING(make type)
  149: make_type=`make -v 2>&1|grep 'ake'|sed 's/ake .*/ake/'`
  150: 
  151: GNUMAKE='#'
  152: test "$make_type" = "GNU Make" && GNUMAKE=''
  153: 
  154: AC_MSG_RESULT($make_type)
  155: 
  156: AC_SUBST(GNUMAKE)
  157: 
  158: AC_MSG_CHECKING([whether the linker accepts -export-dynamic])
  159: OLDLDFLAGS=$LDFLAGS
  160: LDFLAGS="$LDFLAGS -export-dynamic"
  161: dnl AC_TRY_LINK gives false positive on rs6000-ibm-aix4.2.1.0
  162: dnl AC_TRY_LINK(,,ac_export_dynamic=yes,ac_export_dynamic=no)
  163: AC_TRY_RUN(main(){exit(0);},ac_export_dynamic=yes,ac_export_dynamic=no,ac_export_dynamic=no)
  164: test $ac_export_dynamic = yes|| LDFLAGS=$OLDLDFLAGS
  165: AC_MSG_RESULT($ac_export_dynamic)
  166: 
  167: #terminology is a bit unusual here: The host is the system on which
  168: #gforth will run; the system on which configure will run is the `build'
  169: AC_CANONICAL_HOST
  170: case "$host_cpu" in
  171: 	arm*)
  172: 		machine=arm
  173: 		CFLAGS="$CFLAGS -fomit-frame-pointer"
  174: 		if test -z $no_dynamic_default; then
  175: 		    no_dynamic_default=1
  176: 		    AC_MSG_WARN([No I-cache flush code known, disabling dynamic native code generation])
  177: 		fi
  178: 		;;
  179: 	hppa*)
  180: 		machine=hppa
  181: 		$srcdir/mkinstalldirs arch/hppa
  182: 		AC_LIBOBJ(../arch/hppa/cache)
  183: 		#-N needed for --dynamic <M4U3b.3790$9d.317@news.cpqcorp.net>
  184: 		LDFLAGS="$LDFLAGS -Xlinker -N"
  185: 		LIBS="$LIBS -L/lib/pa1.1/"
  186: 		;;
  187: 	sparc*)
  188: 		machine=sparc
  189: 		;;
  190: 	i386)
  191: 		machine=386
  192: 		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem"
  193: 		;;
  194: 	i486)
  195: 		machine=386
  196: 		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem -m486"
  197: 		;;
  198: 	i*86)
  199: 		machine=386
  200: 		CFLAGS="$CFLAGS -fomit-frame-pointer -fforce-addr -fforce-mem"
  201: 		CFLAGS_1="$CFLAGS"
  202: 		CFLAGS="$CFLAGS -march=pentium"
  203: 		AC_TRY_COMPILE(,,,CFLAGS="$CFLAGS_1 -m486")
  204: 		;;
  205: 	x86_64)
  206: 		machine=amd64
  207: 		;;
  208: 	ia64*)
  209: 		machine=ia64
  210: 		AC_LIBOBJ(../arch/ia64/flush_icache_block)
  211: 		test "$skipcode" || skipcode="nop.i 0"
  212: 		#".skip 16" passes the test below,
  213: 		# but gives an assembler error in engine
  214: 		;;
  215:         m68k)
  216: 		machine=m68k
  217: 		CFLAGS="$CFLAGS -fomit-frame-pointer"
  218: 		if test "$host_os" = "nextstep3"
  219: 		then
  220: 			AC_LIBOBJ(termios)
  221: 		fi
  222: 		;;
  223: 	mips*)
  224: 		machine=mips
  225: 		#dynamic native code has the following problems on MIPS:
  226: 		#
  227: 		#1) J/JAL seems relocatable, but is are only
  228: 		#relocatable within a 256MB-segment.  While we try to
  229: 		#get the linker to arrange this, there is no guarantee
  230: 		#that this will succeed (and if the user uses a lot of
  231: 		#memory, it is likely to fail).
  232: 		#
  233: 		#2) The way we generate dynamic native code may
  234: 		#violate MIPS architectural restrictions (in
  235: 		#particular, the delay slots of LW, MFLO, etc.)
  236: 		#
  237: 		#Therefore we disable dynamic native code by default:
  238: 		if test -z $no_dynamic_default; then
  239: 		    no_dynamic_default=1
  240: 		    AC_MSG_WARN([Disabling default dynamic native code generation (relocation and delay slot issues)])
  241: 		fi
  242: 		;;
  243: 	alpha*)
  244: 		machine=alpha
  245: 		#full IEEE FP support for more uniformity across platforms:
  246: 		CFLAGS="$CFLAGS -mieee"
  247: 		;;
  248: 	power*|rs6000)
  249: 		machine=power
  250: 		$srcdir/mkinstalldirs arch/power
  251: 		AC_CHECK_FUNC(_sync_cache_range,[true],[AC_LIBOBJ(../arch/power/_sync_cache_range)])
  252: 		#long long is broken on (at least) gcc-2.95.* for PPC
  253: 		test x$ac_cv_sizeof_long_long = x && 
  254: 		($CC -v 2>&1 |grep -q 'gcc version 2.95') &&
  255: 		ac_cv_sizeof_long_long=0
  256: 		;;
  257: 	*)
  258: 		AC_MSG_WARN([Using a generic machine description])
  259: 		AC_MSG_WARN([Assuming C floats and doubles are IEEE floats and doubles (for SF@ DF@ SF! DF!)])
  260: 		AC_MSG_WARN([FLUSH-ICACHE will do nothing, so END-CODE may not work properly!])
  261: 		machine=generic
  262: 		#I-cache flushing would be needed for dynamic code generation
  263: 		if test -z $no_dynamic_default; then
  264: 		    no_dynamic_default=1
  265: 		    AC_MSG_WARN([No I-cache flush code known, disabling dynamic native code generation])
  266: 		fi
  267: esac
  268: AC_SUBST(host)
  269: 
  270: test x$STACK_CACHE_DEFAULT_FAST = x && STACK_CACHE_DEFAULT_FAST=1
  271: AC_DEFINE_UNQUOTED(STACK_CACHE_DEFAULT_FAST, $STACK_CACHE_DEFAULT_FAST,
  272: 		   [number of registers in the default stack cache state for gforth-fast and gforth-native])
  273: 
  274: test x$GCC_PR15242_WORKAROUND = x ||
  275: AC_DEFINE_UNQUOTED(GCC_PR15242_WORKAROUND, $GCC_PR15242_WORKAROUND,
  276:                    [force (1) or forbid (0) use of a workaround for a gcc performance bug])
  277: 
  278: dnl AC_DEFINE(GCC_PR15242_WORKAROUND,,[Define if you want to get dynamic code
  279: dnl generation on gccs affected by PR15242])
  280: 
  281: 
  282: if test "${enable_force_ll+set}" = set; then
  283:    ac_includes_default="$ac_includes_default
  284: #include \"arch/generic/128bit.h\""
  285: fi
  286: 
  287: dnl the following macro produces a warning with autoconf-2.1
  288: AC_CHECK_SIZEOF(char *)
  289: case "$ac_cv_sizeof_char_p" in
  290:   2)
  291:     wordsize=16
  292:     ;;
  293:   4)
  294:     wordsize=32
  295:     ;;
  296:   8)
  297:     wordsize=64
  298:     ;;
  299: esac
  300: 
  301: AC_CHECK_SIZEOF(char)
  302: AC_CHECK_SIZEOF(short)
  303: AC_CHECK_SIZEOF(int)
  304: AC_CHECK_SIZEOF(long)
  305: AC_CHECK_SIZEOF(long long)
  306: AC_CHECK_SIZEOF(intptr_t)
  307: AC_CHECK_SIZEOF(int128_t)
  308: AC_CHECK_SIZEOF(uint128_t)
  309: 
  310: AC_MSG_CHECKING([for a C type for cells])
  311: ac_cv_int_type_cell=none
  312: case "$ac_cv_sizeof_char_p" in
  313:   $ac_cv_sizeof_int)
  314:     ac_cv_int_type_cell=int
  315:     ;;
  316:   $ac_cv_sizeof_short)
  317:     ac_cv_int_type_cell=short
  318:     ;;
  319:   $ac_cv_sizeof_char)
  320:     ac_cv_int_type_cell=char
  321:     ;;
  322:   $ac_cv_sizeof_long)
  323:     ac_cv_int_type_cell=long
  324:     ;;
  325:   $ac_cv_sizeof_long_long)
  326:     ac_cv_int_type_cell="long long"
  327:     ;;
  328:   $ac_cv_sizeof_intptr_t)
  329:     ac_cv_int_type_cell="intptr_t"
  330:     ;;
  331:   $ac_cv_sizeof_int128_t)
  332:     ac_cv_int_type_cell="int128_t"
  333:     ;;
  334: esac
  335: AC_MSG_RESULT($ac_cv_int_type_cell)
  336: AC_DEFINE_UNQUOTED(CELL_TYPE,$ac_cv_int_type_cell,[an integer type that is as long as a pointer])
  337: 
  338: AC_MSG_CHECKING([for a C type for wydes])
  339: ac_cv_wyde_type_cell=none
  340: case 2 in
  341:   $ac_cv_sizeof_int)
  342:     ac_cv_wyde_type_cell=int
  343:     ;;
  344:   $ac_cv_sizeof_short)
  345:     ac_cv_wyde_type_cell=short
  346:     ;;
  347:   $ac_cv_sizeof_char)
  348:     ac_cv_wyde_type_cell=char
  349:     ;;
  350:   $ac_cv_sizeof_long)
  351:     ac_cv_wyde_type_cell=long
  352:     ;;
  353:   $ac_cv_sizeof_long_long)
  354:     ac_cv_wyde_type_cell="long long"
  355:     ;;
  356:   $ac_cv_sizeof_intptr_t)
  357:     ac_cv_wyde_type_cell="intptr_t"
  358:     ;;
  359:   $ac_cv_sizeof_int128_t)
  360:     ac_cv_wyde_type_cell="int128_t"
  361:     ;;
  362: esac
  363: AC_MSG_RESULT($ac_cv_wyde_type_cell)
  364: AC_DEFINE_UNQUOTED(WYDE_TYPE,$ac_cv_wyde_type_cell,[an integer type that is 2 bytes long])
  365: 
  366: AC_MSG_CHECKING([for a C type for tetrabytes])
  367: ac_cv_tetrabyte_type_cell=none
  368: case 4 in
  369:   $ac_cv_sizeof_int)
  370:     ac_cv_tetrabyte_type_cell=int
  371:     ;;
  372:   $ac_cv_sizeof_short)
  373:     ac_cv_tetrabyte_type_cell=short
  374:     ;;
  375:   $ac_cv_sizeof_char)
  376:     ac_cv_tetrabyte_type_cell=char
  377:     ;;
  378:   $ac_cv_sizeof_long)
  379:     ac_cv_tetrabyte_type_cell=long
  380:     ;;
  381:   $ac_cv_sizeof_long_long)
  382:     ac_cv_tetrabyte_type_cell="long long"
  383:     ;;
  384:   $ac_cv_sizeof_intptr_t)
  385:     ac_cv_tetrabyte_type_cell="intptr_t"
  386:     ;;
  387:   $ac_cv_sizeof_int128_t)
  388:     ac_cv_tetrabyte_type_cell="int128_t"
  389:     ;;
  390: esac
  391: AC_MSG_RESULT($ac_cv_tetrabyte_type_cell)
  392: AC_DEFINE_UNQUOTED(TETRABYTE_TYPE,$ac_cv_tetrabyte_type_cell,[an integer type that is 4 bytes long])
  393: 
  394: AC_MSG_CHECKING([for a C type for double-cells])
  395: ac_cv_int_type_double_cell=none
  396: case `expr 2 '*' "$ac_cv_sizeof_char_p"` in
  397:   $ac_cv_sizeof_short)
  398:     ac_cv_int_type_double_cell=short
  399:     ;;
  400:   $ac_cv_sizeof_int)
  401:     ac_cv_int_type_double_cell=int
  402:     ;;
  403:   $ac_cv_sizeof_long)
  404:     ac_cv_int_type_double_cell=long
  405:     ;;
  406:   $ac_cv_sizeof_long_long)
  407:     ac_cv_int_type_double_cell="long long"
  408:     ;;
  409:   $ac_cv_sizeof_intptr_t)
  410:     ac_cv_int_type_double_cell="intptr_t"
  411:     ;;
  412:   $ac_cv_sizeof_int128_t)
  413:     ac_cv_int_type_double_cell="int128_t"
  414:     ;;
  415: esac
  416: AC_MSG_RESULT($ac_cv_int_type_double_cell)
  417: 
  418: AC_MSG_CHECKING([for a C type for unsigned double-cells])
  419: ac_cv_int_type_double_ucell=none
  420: case `expr 2 '*' "$ac_cv_sizeof_char_p"` in
  421:   $ac_cv_sizeof_short)
  422:     ac_cv_int_type_double_ucell="unsigned short"
  423:     ;;
  424:   $ac_cv_sizeof_int)
  425:     ac_cv_int_type_double_ucell="unsigned int"
  426:     ;;
  427:   $ac_cv_sizeof_long)
  428:     ac_cv_int_type_double_ucell="unsigned long"
  429:     ;;
  430:   $ac_cv_sizeof_long_long)
  431:     ac_cv_int_type_double_ucell="unsigned long long"
  432:     ;;
  433:   $ac_cv_sizeof_intptr_t)
  434:     ac_cv_int_type_double_ucell="unsigned intptr_t"
  435:     ;;
  436:   $ac_cv_sizeof_uint128_t)
  437:     ac_cv_int_type_double_ucell="uint128_t"
  438:     ;;
  439: esac
  440: AC_MSG_RESULT($ac_cv_int_type_double_ucell)
  441: 
  442: if test "$ac_cv_int_type_double_cell" = none || \
  443:    test "$ac_cv_int_type_double_ucell" = none
  444: then
  445: 	AC_MSG_WARN([Emulating double-cell arithmetic. This may be slow.])
  446: 	AC_LIBOBJ(dblsub)
  447: 	AC_DEFINE(BUGGY_LONG_LONG,,[define this if there is no working DOUBLE_CELL_TYPE on your machine])
  448: else
  449: 	AC_DEFINE_UNQUOTED(DOUBLE_CELL_TYPE,$ac_cv_int_type_double_cell,[an integer type that is twice as long as a pointer])
  450: 	AC_DEFINE_UNQUOTED(DOUBLE_UCELL_TYPE,$ac_cv_int_type_double_ucell,[an unsigned integer type that is twice as long as a pointer])
  451: fi
  452: 
  453: AC_TYPE_OFF_T
  454: AC_CHECK_SIZEOF(off_t)
  455: test $ac_cv_sizeof_off_t -gt $ac_cv_sizeof_char_p
  456: ac_small_off_t=$?
  457: AC_DEFINE_UNQUOTED(SMALL_OFF_T,$ac_small_off_t,[1 if off_t fits in a Cell])
  458: 
  459: ENGINE_FLAGS=
  460: AC_SUBST(ENGINE_FLAGS)
  461: 
  462: # Try if GCC understands -fno-gcse
  463: 
  464: AC_MSG_CHECKING([if $CC understands -fno-gcse])
  465: CFLAGS_1="$CFLAGS"
  466: CFLAGS="$CFLAGS -fno-gcse"
  467: AC_TRY_COMPILE(,,ac_nogcse=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-gcse",ac_nogcse=no)
  468: CFLAGS="$CFLAGS_1"
  469: AC_MSG_RESULT($ac_nogcse)
  470: 
  471: # Try if GCC understands -fno-strict-aliasing
  472: AC_MSG_CHECKING([if $CC understands -fno-strict-aliasing])
  473: CFLAGS_1="$CFLAGS"
  474: CFLAGS="$CFLAGS -fno-strict-aliasing"
  475: AC_TRY_COMPILE(,,ac_nostrictaliasing=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-strict-aliasing",ac_nostrictaliasing=no)
  476: CFLAGS="$CFLAGS_1"
  477: AC_MSG_RESULT($ac_nostrictaliasing)
  478: 
  479: # Try if GCC understands -fno-crossjumping
  480: AC_MSG_CHECKING([if $CC understands -fno-crossjumping])
  481: CFLAGS_1="$CFLAGS"
  482: CFLAGS="$CFLAGS -fno-crossjumping"
  483: AC_TRY_COMPILE(,,ac_nocrossjumping=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-crossjumping",ac_nocrossjumping=no)
  484: CFLAGS="$CFLAGS_1"
  485: AC_MSG_RESULT($ac_nocrossjumping)
  486: 
  487: # Try if GCC understands -fno-reorder-blocks
  488: AC_MSG_CHECKING([if $CC understands -fno-reorder-blocks])
  489: CFLAGS_1="$CFLAGS"
  490: CFLAGS="$CFLAGS -fno-reorder-blocks"
  491: AC_TRY_COMPILE(,,ac_noreorder_blocks=yes;ENGINE_FLAGS="$ENGINE_FLAGS -fno-reorder-blocks",ac_noreorder_blocks=no)
  492: CFLAGS="$CFLAGS_1"
  493: AC_MSG_RESULT($ac_noreorder_blocks)
  494: 
  495: # Try if GCC understands __attribute__((unused))
  496: AC_MSG_CHECKING([how to suppress 'unused variable' warnings])
  497: AC_TRY_COMPILE(,[int __attribute__((unused)) foo;], MAYBE_UNUSED='__attribute__((unused))',)
  498: AC_DEFINE_UNQUOTED(MAYBE_UNUSED,$MAYBE_UNUSED,[attribute for possibly unused variables])
  499: AC_MSG_RESULT($MAYBE_UNUSED)
  500: 
  501: AC_CHECK_PROG(asm_fs,asm.fs,arch/$machine/asm.fs,,$srcdir/arch/$machine)
  502: AC_SUBST(asm_fs)
  503: 
  504: AC_CHECK_PROG(disasm_fs,disasm.fs,arch/$machine/disasm.fs,,$srcdir/arch/$machine)
  505: AC_SUBST(disasm_fs)
  506: 
  507: AC_PATH_PROG(INSTALL_INFO,install-info,[echo '>>>>Please make info dir entry:'],$PATH:/sbin:/usr/sbin:/usr/local/sbin)
  508: 
  509: case "$host_os" in
  510: 	*win32*)
  511: 		# !!!FIXME!!! problems with cygwin and ';' as path separator
  512: 		DIRSEP="\\\\"
  513: 		PATHSEP=";"
  514: 		#we want the builtins of command.com/cmd.exe and its
  515: 		# handling of .com files.
  516: 		#$COMSPEC contains the name of the Windows shell;
  517: 		# the ./ is there, because the bash does not recognize
  518: 		# absolute DOS filenames
  519: 		DEFAULTSYSTEMPREFIX="./$COMSPEC /c "
  520: 		;;
  521: 	*darwin*)
  522: 		#Darwin uses some funny preprocessor by default; eliminate it:
  523: 		AC_MSG_NOTICE([using -no-cpp-precomp on Darwin])
  524: 		CFLAGS="$CFLAGS -no-cpp-precomp"
  525: 		DIRSEP="/"
  526: 		PATHSEP=":"
  527: 		DEFAULTSYSTEMPREFIX=""
  528: 		;;
  529: 	*)
  530: 		DIRSEP="/"
  531: 		PATHSEP=":"
  532: 		DEFAULTSYSTEMPREFIX=""
  533: 		;;
  534: esac
  535: AC_SUBST(DIRSEP)
  536: AC_DEFINE_UNQUOTED(DIRSEP,'$DIRSEP',[a directory separator character])
  537: AC_SUBST(PATHSEP)
  538: AC_DEFINE_UNQUOTED(PATHSEP,'$PATHSEP',[a path separator character])
  539: AC_SUBST(DEFAULTSYSTEMPREFIX)
  540: AC_DEFINE_UNQUOTED(DEFAULTSYSTEMPREFIX,"$DEFAULTSYSTEMPREFIX",[default for environment variable GFORTHSYSTEMPREFIX])
  541: 
  542: #work around SELinux brain damage (from Andrew Haley <12t8f3jakb74g2c@news.supernews.com>)
  543: #This magic incantation  seems to be completely undocumented.
  544: AC_CHECK_PROG([MASSAGE_EXE],[chcon],[chcon -t unconfined_execmem_exec_t],[true])
  545: 
  546: dnl Now a little support for DOS/DJGCC
  547: AC_SUBST(GFORTH_EXE)
  548: GFORTH_EXE=""
  549: AC_SUBST(GFORTHFAST_EXE)
  550: GFORTHFAST_EXE=""
  551: AC_SUBST(GFORTHITC_EXE)
  552: GFORTHITC_EXE=""
  553: AC_SUBST(GFORTHDITC_EXE)
  554: GFORTHDITC_EXE=""
  555: 
  556: AC_SUBST(FORTHSIZES)
  557: 
  558: dnl if test "$PEEPHOLE" = "yes"
  559: dnl then
  560: dnl    PEEPHOLEFLAG="true"
  561: dnl    AC_DEFINE(HAS_PEEPHOLE,,[Define if you want to use peephole optimization])
  562: dnl else
  563: dnl    PEEPHOLEFLAG="false"
  564: dnl fi
  565: PEEPHOLEFLAG="true"
  566: AC_SUBST(PEEPHOLEFLAG)
  567: 
  568: dnl copy commands for systems that don't have links
  569: AC_SUBST(LINK_KERNL)
  570: LINK_KERNL=""
  571: 
  572: #if test $host_os=dos
  573: #then
  574: #  echo Configuring for DOS!!!
  575: #  MAKE_EXE="coff2exe gforth"
  576: #  LINK_KERNL='$(CP) kernl32l.fi kernel.fi'
  577: #fi
  578: 
  579: dnl the following macro produces a warning with autoconf-2.1
  580: AC_C_BIGENDIAN
  581: AC_SUBST(KERNEL)
  582: dnl ac_cv_c_bigendian is an undocumented variable of autoconf-2.1
  583: if test $ac_cv_c_bigendian = yes; then
  584:   bytesex=b
  585:   KERNEL="kernl16b.fi kernl16l.fi kernl32b.fi kernl32l.fi kernl64b.fi kernl64l.fi"
  586: else
  587:   bytesex=l
  588:   KERNEL="kernl16l.fi kernl16b.fi kernl32l.fi kernl32b.fi kernl64l.fi kernl64b.fi"
  589: fi
  590: 
  591: #check how to do asm(".skip 16")
  592: #echo "CFLAGS=$CFLAGS"
  593: #echo "ac_link=$ac_link"
  594: AC_MSG_CHECKING([if and how we can waste code space])
  595: if test -z "$skipcode"; then
  596:     skipcode=no
  597:     CFLAGS_1="$CFLAGS"
  598:     CFLAGS="$CFLAGS $ENGINE_FLAGS"
  599:     for i in ".skip 16" ".block 16" ".org .+16" ".=.+16" ".space 16"
  600:     do
  601: 	AC_TRY_RUN(
  602: [int foo(int,int,int);
  603: main()
  604: {
  605:   exit(foo(0,0,0)!=16);
  606: }
  607: int foo(int x, int y, int z)
  608: {
  609:   static void *labels[]={&&label1, &&label2};
  610:   if (x) {
  611:     y++; /* workaround for http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12108 */
  612:   label1:
  613:     asm("$i"); /* or ".space 16" or somesuch */
  614:   label2: ;
  615:   }
  616:   {
  617:   if (y) goto *labels[z]; /* workaround for gcc PR12108 */
  618:   return labels[1]-labels[0];
  619:   }
  620: }]
  621: 	,skipcode=$i; break
  622: 	,,)
  623:     done
  624:     CFLAGS=$CFLAGS_1
  625: fi
  626: AC_MSG_RESULT($skipcode)
  627: if test "$skipcode" = no
  628: then 
  629:     if test -z $no_dynamic_default; then
  630: 	no_dynamic_default=1
  631: 	AC_MSG_WARN(Disabling default dynamic native code generation)
  632:     fi
  633:     AC_DEFINE_UNQUOTED(SKIP16,((void)0),statement for skipping 16 bytes)
  634: else
  635:     AC_DEFINE_UNQUOTED(SKIP16,asm("$skipcode"),statement for skipping 16 bytes)
  636: fi
  637: 
  638: test "$no_dynamic_default" || no_dynamic_default=0
  639: AC_DEFINE_UNQUOTED(NO_DYNAMIC_DEFAULT,$no_dynamic_default,default value for no_dynamic)
  640: 
  641: dnl Checks for programs.
  642: AC_PROG_LN_S
  643: AC_PROG_INSTALL
  644: AC_CHECK_PROGS(TEXI2DVI,texi2dvi4a2ps texi2dvi)
  645: 
  646: dnl Checks for library functions
  647: dnl This check is just for making later checks link with libm.
  648: dnl using sin here is no good idea since it is built-into gcc and typechecked
  649: AC_CHECK_LIB(m,asin)
  650: AC_CHECK_LIB(dl,dlopen)
  651: dnl check for libffi 2.x
  652: AC_CHECK_LIB(ffi,ffi_call)
  653: if test $ac_cv_lib_ffi_ffi_call = yes
  654: then
  655: LIBFFIFLAG="true"
  656: FFCALLFLAG="false"
  657: OLDCALLFLAG="false"
  658: AC_DEFINE(HAS_LIBFFI,,[define this if you want to use the ffcall interface with libffi 2.0])
  659: else
  660: dnl check for ffcall libraries
  661: dnl unfortunately, these four calls are separated out into a library each.
  662: AC_CHECK_LIB(avcall,__builtin_avcall)
  663: AC_CHECK_LIB(callback,__vacall_r)
  664: AC_CHECK_LIB(vacall,vacall)
  665: AC_CHECK_LIB(trampoline,alloc_trampoline)
  666: LIBFFIFLAG="false"
  667: FFCALLFLAG="false"
  668: OLDCALLFLAG="true"
  669: 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])
  670: test $ac_cv_lib_avcall___builtin_avcall = no && AC_DEFINE(HAS_OLDCALL,,[define this if you want to use the old call libraries])
  671: fi
  672: AC_SUBST(LIBFFIFLAG)
  673: AC_SUBST(FFCALLFLAG)
  674: AC_SUBST(OLDCALLFLAG)
  675: if test "$host_os" != "nextstep3"
  676: then
  677: 	AC_FUNC_MEMCMP
  678: fi
  679: AC_REPLACE_FUNCS(memmove strtoul pow10 strerror strsignal atanh)
  680: AC_FUNC_FSEEKO
  681: AC_CHECK_FUNCS(ftello dlopen sys_siglist getrusage)
  682: AC_CHECK_TYPES(stack_t,,,[#include <signal.h>])
  683: AC_DECL_SYS_SIGLIST
  684: AC_CHECK_FUNC(getopt_long,[true],[AC_LIBOBJ(getopt) AC_LIBOBJ(getopt1)])
  685: AC_CHECK_FUNCS(expm1 log1p)
  686: AC_REPLACE_FUNCS(rint ecvt)
  687: dnl No check for select, because our replacement is no good under
  688: dnl anything but DOS
  689: AC_CHECK_HEADERS(sys/mman.h fnmatch.h)
  690: AC_FUNC_FNMATCH
  691: test $ac_cv_func_fnmatch_works = yes || AC_LIBOBJ(fnmatch)
  692: AC_CHECK_FUNCS(mmap sysconf getpagesize)
  693: AM_PATH_LISPDIR
  694: 
  695: kernel_fi=kernl${wordsize}${bytesex}.fi
  696: AC_SUBST(kernel_fi)
  697: 
  698: #this breaks bindists
  699: #dnl replace srource directory by absolute value
  700: #if test $srcdir = "."; then srcdir=`pwd` 
  701: #fi
  702: 
  703: AC_SUBST(machine)
  704: AC_CONFIG_FILES([
  705: Makefile
  706: Makedist
  707: gforthmi
  708: vmgen
  709: machpc.fs
  710: envos.fs
  711: engine/Makefile
  712: doc/version.texi
  713: build-ec ])
  714: AC_CONFIG_COMMANDS([stamp-h],[[echo timestamp > stamp-h
  715: chmod +x gforthmi
  716: chmod +x vmgen
  717: chmod +x build-ec
  718: test -d kernel||mkdir kernel]],[[]])
  719: AC_OUTPUT
  720: 

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