src/Unix/configure.ac

dnl Process this file with autoconf to produce a configure script.
dnl Written in 2002 by Christian Bauer

AC_INIT([SheepShaver], 2.2, [Christian.Bauer@uni-mainz.de], SheepShaver)
AC_CONFIG_SRCDIR(main_unix.cpp)
AC_PREREQ(2.52)
AC_CONFIG_HEADER(config.h)

dnl Canonical system information.
AC_CANONICAL_HOST
AC_CANONICAL_TARGET

dnl Some systems do not put corefiles in the currect directory, avoid saving
dnl cores for the configure tests since some are intended to dump core.
ulimit -c 0

dnl Invite Cygwin users to build within the Windows/ directory
case $target_os in
*cygwin* | *mingw32*)
  AC_MSG_ERROR([You can only build the Windows version from its directory, Cygwin/X11 is not supported.])
  ;;
esac

dnl Options.
AC_ARG_ENABLE(jit,          [  --enable-jit            enable JIT compiler [default=yes]], [WANT_JIT=$enableval], [WANT_JIT=yes])
AC_ARG_ENABLE(ppc-emulator, [  --enable-ppc-emulator   use the selected PowerPC emulator [default=auto]], [WANT_EMULATED_PPC=$enableval], [WANT_EMULATED_PPC=auto])
AC_ARG_ENABLE(fbdev-dga,    [  --enable-fbdev-dga      use direct frame buffer access via /dev/fb0 [default=yes]], [WANT_FBDEV_DGA=$enableval], [WANT_FBDEV_DGA=yes])
AC_ARG_ENABLE(xf86-dga,     [  --enable-xf86-dga       use the XFree86 DGA extension [default=yes]], [WANT_XF86_DGA=$enableval], [WANT_XF86_DGA=yes])
AC_ARG_ENABLE(xf86-vidmode, [  --enable-xf86-vidmode   use the XFree86 VidMode extension [default=yes]], [WANT_XF86_VIDMODE=$enableval], [WANT_XF86_VIDMODE=yes])
AC_ARG_ENABLE(vosf,         [  --enable-vosf           enable video on SEGV signals [default=yes]], [WANT_VOSF=$enableval], [WANT_VOSF=yes])
AC_ARG_WITH(esd,            [  --with-esd              support ESD for sound under Linux/FreeBSD [default=yes]], [WANT_ESD=$withval], [WANT_ESD=yes])
AC_ARG_WITH(gtk,            [  --with-gtk              use GTK user interface [default=yes]],
  [case "$withval" in
   gtk1)      WANT_GTK="gtk";;
   gtk|gtk2)  WANT_GTK="$withval";;
   yes)       WANT_GTK="gtk2 gtk";;
   *)         WANT_GTK="no";;
   esac],
  [WANT_GTK="gtk2 gtk"])
AC_ARG_WITH(mon,            [  --with-mon              use mon as debugger [default=yes]], [WANT_MON=$withval], [WANT_MON=yes])
AC_ARG_WITH(dgcc,           [  --with-dgcc=COMPILER    use C++ COMPILER to compile synthetic opcodes], [DYNGEN_CC=$withval])

dnl Addressing mode
AC_ARG_ENABLE(addressing,
  [  --enable-addressing=AM  set the addressing mode to use [default=real]],
  [case "$enableval" in
   real)        WANT_ADDRESSING_MODE="real";;
   direct)      WANT_ADDRESSING_MODE="direct";;
   direct,0x*)  WANT_ADDRESSING_MODE="direct"; NATMEM_OFFSET=`echo "$enableval" | sed -n '/direct,\(0[[xX]][[0-9A-Fa-f]]*\([[UuLl]]\{1,2\}\)\?\)$/s//\1/p'`;;
   esac],
  [WANT_ADDRESSING_MODE="real"]
)

dnl SDL options.
AC_ARG_ENABLE(sdl-static,   [  --enable-sdl-static     use SDL static libraries for linking [default=no]], [WANT_SDL_STATIC=$enableval], [WANT_SDL_STATIC=no])
AC_ARG_ENABLE(sdl-video,    [  --enable-sdl-video      use SDL for video graphics [default=no]], [WANT_SDL_VIDEO=$enableval], [WANT_SDL_VIDEO=no])
AC_ARG_ENABLE(sdl-audio,    [  --enable-sdl-audio      use SDL for audio [default=no]], [WANT_SDL_AUDIO=$enableval], [WANT_SDL_AUDIO=no])

dnl Checks for programs.
AC_PROG_CC
AC_PROG_CPP
AC_PROG_CXX
AC_PROG_MAKE_SET
AC_PROG_INSTALL
AC_PROG_EGREP
AC_PATH_PROGS(FILE, [file false])
AC_PATH_PROG(PERL, [perl])

dnl Check for PowerPC target CPU.
HAVE_PPC=no
AC_MSG_CHECKING(for PowerPC target CPU)
AC_EGREP_CPP(yes,
[
#ifdef __powerpc__
  yes
#endif
#ifdef __ppc__
  yes
#endif
], [AC_MSG_RESULT(yes); HAVE_PPC=yes], AC_MSG_RESULT(no))

dnl We use native CPU if possible.
EMULATED_PPC=yes
case $WANT_EMULATED_PPC in
  auto) [[ "x$HAVE_PPC" = "xyes" ]] && EMULATED_PPC=no;;
  no)   EMULATED_PPC=no;;
esac
if [[ "x$EMULATED_PPC" = "xyes" ]]; then
  AC_DEFINE(EMULATED_PPC, 1, [Define if using a PowerPC CPU emulator.])
fi

dnl We use mon if possible.
MONSRCS=
case "x$WANT_MON" in
x/* | x.*)
  mon_srcdir=$WANT_MON
  WANT_MON=yes
  ;;
xyes)
  mon_srcdir=../../../mon/src
  ;;
esac
if [[ "x$WANT_MON" = "xyes" ]]; then
  AC_MSG_CHECKING(for mon)
  if grep mon_init $mon_srcdir/mon.h >/dev/null 2>/dev/null; then
    AC_MSG_RESULT(yes)
    AC_DEFINE(ENABLE_MON, 1, [Define if using "mon".])
    MONSRCS="$mon_srcdir/mon.cpp $mon_srcdir/mon_6502.cpp $mon_srcdir/mon_z80.cpp $mon_srcdir/mon_cmd.cpp $mon_srcdir/mon_lowmem.cpp $mon_srcdir/mon_disass.cpp $mon_srcdir/mon_ppc.cpp $mon_srcdir/disass/floatformat.c $mon_srcdir/disass/i386-dis.c $mon_srcdir/disass/m68k-dis.c $mon_srcdir/disass/m68k-opc.c"
    CXXFLAGS="$CXXFLAGS -I$mon_srcdir -I$mon_srcdir/disass"
    AC_CHECK_LIB(ncurses, tgetent, ,
      AC_CHECK_LIB(termcap, tgetent, ,
        AC_CHECK_LIB(termlib, tgetent, ,
          AC_CHECK_LIB(terminfo, tgetent, ,
            AC_CHECK_LIB(Hcurses, tgetent, ,
              AC_CHECK_LIB(curses, tgetent))))))
    AC_CHECK_LIB(readline, readline)
    AC_CHECK_HEADERS(readline.h history.h readline/readline.h readline/history.h)
  else
    AC_MSG_RESULT(no)
    AC_MSG_WARN([Could not find mon, ignoring --with-mon.])
    WANT_MON=no
  fi
fi
AC_SUBST(MONSRCS)

dnl Checks for libraries.
AC_CHECK_LIB(posix4, sem_init)

dnl Do we need SDL?
WANT_SDL=no
if [[ "x$WANT_SDL_VIDEO" = "xyes" ]]; then
  WANT_SDL=yes
  WANT_XF86_DGA=no
  WANT_XF86_VIDMODE=no
  WANT_FBDEV_DGA=no
  SDL_SUPPORT="$SDL_SUPPORT video"
fi
if [[ "x$WANT_SDL_AUDIO" = "xyes" ]]; then
  WANT_SDL=yes
  SDL_SUPPORT="$SDL_SUPPORT audio"
fi
if [[ "x$WANT_SDL" = "xyes" ]]; then
  AC_PATH_PROG(sdl_config, "sdl-config")
  if [[ -n "$sdl_config" ]]; then
    sdl_cflags=`$sdl_config --cflags`
    if [[ "x$WANT_SDL_STATIC" = "xyes" ]]; then
      sdl_libs=`$sdl_config --static-libs`
    else
      sdl_libs=`$sdl_config --libs`
    fi
    CFLAGS="$CFLAGS $sdl_cflags"
    CXXFLAGS="$CXXFLAGS $sdl_cflags"
    LIBS="$LIBS $sdl_libs"
  else
    WANT_SDL=no
    WANT_SDL_VIDEO=no
    WANT_SDL_AUDIO=no
  fi
  SDL_SUPPORT=`echo "$SDL_SUPPORT" | sed -e "s/^ //"`
else
  SDL_SUPPORT="none"
fi

dnl We need X11, if not using SDL.
if [[ "x$WANT_SDL_VIDEO" != "xyes" ]]; then
  AC_PATH_XTRA
  if [[ "x$no_x" = "xyes" ]]; then
    AC_MSG_ERROR([You need X11 to run SheepShaver.])
  fi
  CFLAGS="$CFLAGS $X_CFLAGS"
  CXXFLAGS="$CXXFLAGS $X_CFLAGS"
  LIBS="$LIBS $X_PRE_LIBS $X_LIBS -lX11 -lXext $X_EXTRA_LIBS"
fi

dnl We need pthreads on non-PowerPC systems. Try libpthread first, then libc_r (FreeBSD), then PTL.
HAVE_PTHREADS=yes
case $EMULATED_PPC:$target_os in
no:linux*|no:netbsd*)
  dnl We do have our own pthread_cancel() implementation
  AC_DEFINE(HAVE_PTHREAD_CANCEL, 1, [Define if you have the pthread_cancel function.])
  ;;
*:*)
  AC_CHECK_LIB(pthread, pthread_create, , [
    AC_CHECK_LIB(c_r, pthread_create, , [
      AC_CHECK_LIB(PTL, pthread_create, , [
        dnl XXX remove when no pthreads case is merged
        AC_MSG_ERROR([You need pthreads to run SheepShaver.])
        HAVE_PTHREADS=no
      ])
    ])
  ])
  AC_CHECK_FUNCS(pthread_cancel)
  AC_CHECK_FUNCS(pthread_cond_init pthread_testcancel)
  AC_CHECK_FUNCS(pthread_mutexattr_setprotocol)
  AC_CHECK_FUNCS(pthread_mutexattr_settype)
  AC_CHECK_FUNCS(pthread_mutexattr_setpshared)
  dnl If POSIX.4 semaphores are not available, we emulate them with pthread mutexes.
  SEMSRC=
  AC_CHECK_FUNCS(sem_init, , [
  if test "x$HAVE_PTHREADS" = "xyes"; then
    SEMSRC=posix_sem.cpp
  fi
  ])
  ;;
esac
if [[ "x$HAVE_PTHREADS" = "xyes" ]]; then
  AC_DEFINE(HAVE_PTHREADS, 1, [Define if pthreads are available.])
fi

dnl We use FBDev DGA if possible.
if [[ "x$WANT_FBDEV_DGA" = "xyes" ]]; then
  AC_CHECK_HEADER(linux/fb.h, [
    AC_DEFINE(ENABLE_FBDEV_DGA, 1, [Define if using Linux fbdev extension.])
  ], [
    AC_MSG_WARN([Could not find Linux FBDev extension, ignoring --enable-fbdev-dga.])
    WANT_FBDEV_DGA=no
  ])
fi

dnl We use XFree86 DGA if possible.
if [[ "x$WANT_XF86_DGA" = "xyes" ]]; then
  AC_CHECK_LIB(Xxf86dga, XF86DGAQueryExtension, [
    AC_DEFINE(ENABLE_XF86_DGA, 1, [Define if using XFree86 DGA extension.])
    LIBS="$LIBS -lXxf86dga"
  ], [
    AC_MSG_WARN([Could not find XFree86 DGA extension, ignoring --enable-xf86-dga.])
    WANT_XF86_DGA=no
  ])
fi

dnl We use XFree86 VidMode if possible.
if [[ "x$WANT_XF86_VIDMODE" = "xyes" ]]; then
  AC_CHECK_LIB(Xxf86vm, XF86VidModeQueryExtension, [
    AC_DEFINE(ENABLE_XF86_VIDMODE, 1, [Define if using XFree86 DGA extension.])
    LIBS="$LIBS -lXxf86vm"
  ], [
    AC_MSG_WARN([Could not find XFree86 VidMode extension, ignoring --enable-xf86-vidmode.])
    WANT_XF86_VIDMODE=no
  ])
fi

dnl We use GTK+ if possible.
UISRCS=../dummy/prefs_editor_dummy.cpp
case "x$WANT_GTK" in
xgtk2*)
  AM_PATH_GTK_2_0(1.3.15, [
    AC_DEFINE(ENABLE_GTK, 1, [Define if using GTK.])
    CFLAGS="$CFLAGS $GTK_CFLAGS"
    CXXFLAGS="$CXXFLAGS $GTK_CFLAGS"
    LIBS="$LIBS $GTK_LIBS"
    UISRCS=prefs_editor_gtk.cpp
    WANT_GTK=gtk2
  ], [
    case "x${WANT_GTK}x" in
    *gtkx)
      AC_MSG_WARN([Could not find GTK+ 2.0, trying with GTK+ 1.2.])
      WANT_GTK=gtk
      ;;
    *)
      AC_MSG_WARN([Could not find GTK+, disabling user interface.])
      WANT_GTK=no
      ;;
    esac
  ])
  ;;
esac
if [[ "x$WANT_GTK" = "xgtk" ]]; then
  AM_PATH_GTK(1.2.0, [
    AC_DEFINE(ENABLE_GTK, 1, [Define if using GTK.])
    CFLAGS="$CFLAGS $GTK_CFLAGS"
    CXXFLAGS="$CXXFLAGS $GTK_CFLAGS"
    LIBS="$LIBS $GTK_LIBS"
    UISRCS=prefs_editor_gtk.cpp
  ], [
    AC_MSG_WARN([Could not find GTK+, disabling user interface.])
    WANT_GTK=no
  ])
fi

dnl We use ESD if possible.
if [[ "x$WANT_ESD" = "xyes" ]]; then
  AM_PATH_ESD(0.2.8, [
    AC_DEFINE(ENABLE_ESD, 1, [Define is using ESD.])
    CFLAGS="$CFLAGS $ESD_CFLAGS"
    CXXFLAGS="$CXXFLAGS $ESD_CFLAGS"
    LIBS="$LIBS $ESD_LIBS"
  ], [
    AC_MSG_WARN([Could not find ESD, disabling ESD support.])
    WANT_ESD=no
  ])
fi

dnl We use 64-bit file size support if possible.
AC_SYS_LARGEFILE

dnl Checks for header files.
AC_HEADER_STDC
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS(malloc.h stdint.h)
AC_CHECK_HEADERS(mach/vm_map.h mach/mach_init.h sys/mman.h)
AC_CHECK_HEADERS(unistd.h fcntl.h byteswap.h dirent.h)
AC_CHECK_HEADERS(sys/socket.h sys/ioctl.h sys/filio.h sys/bitypes.h sys/wait.h)
AC_CHECK_HEADERS(sys/time.h sys/poll.h sys/select.h arpa/inet.h)
AC_CHECK_HEADERS(linux/if.h linux/if_tun.h net/if.h net/if_tun.h, [], [], [
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
])
AC_CHECK_HEADERS(AvailabilityMacros.h)
AC_CHECK_HEADERS(IOKit/storage/IOBlockStorageDevice.h)
AC_CHECK_HEADERS(fenv.h)

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_BIGENDIAN
AC_C_CONST
AC_C_INLINE
AC_CHECK_SIZEOF(short, 2)
AC_CHECK_SIZEOF(int, 4)
AC_CHECK_SIZEOF(long, 4)
AC_CHECK_SIZEOF(long long, 8)
AC_CHECK_SIZEOF(float, 4)
AC_CHECK_SIZEOF(double, 8)
AC_CHECK_SIZEOF(void *, 4)
AC_TYPE_OFF_T
AC_CHECK_TYPE(loff_t, off_t)
AC_TYPE_SIZE_T
AC_TYPE_SIGNAL
AC_HEADER_TIME
AC_STRUCT_TM

dnl Check whether sys/socket.h defines type socklen_t.
dnl (extracted from ac-archive/Miscellaneous)
AC_CACHE_CHECK([for socklen_t],
  ac_cv_type_socklen_t, [
  AC_TRY_COMPILE([
    #include <sys/types.h>
    #include <sys/socket.h>
  ], [socklen_t len = 42; return 0;],
  ac_cv_type_socklen_t=yes, ac_cv_type_socklen_t=no,
  dnl When cross-compiling, do not assume anything.
  ac_cv_type_socklen_t="guessing no"
  )
])
if [[ "x$ac_cv_type_socklen_t" != "xyes" ]]; then
  AC_DEFINE(socklen_t, int, [Define to 'int' if <sys/types.h> doesn't define.])
fi

dnl Check whether struct sigaction has sa_restorer member.
AC_CACHE_CHECK([whether struct sigaction has sa_restorer],
  ac_cv_signal_sa_restorer, [
  AC_TRY_COMPILE([
    #include <signal.h>
  ], [struct sigaction sa; sa.sa_restorer = 0;],
  ac_cv_signal_sa_restorer=yes, ac_cv_signal_sa_restorer=no,
  dnl When cross-compiling, do not assume anything.
  ac_cv_signal_sa_restorer=no
  )
])
if [[ "x$ac_cv_signal_sa_restorer" = "xyes" ]]; then
  AC_DEFINE(HAVE_SIGNAL_SA_RESTORER, 1, [Define if sa_restorer is available in struct sigaction.])
fi

dnl Checks for library functions.
AC_CHECK_FUNCS(strdup strerror strlcpy cfmakeraw)
AC_CHECK_FUNCS(nanosleep)
AC_CHECK_FUNCS(sigaction signal)
AC_CHECK_FUNCS(mmap mprotect munmap)
AC_CHECK_FUNCS(vm_allocate vm_deallocate vm_protect)
AC_CHECK_FUNCS(exp2f log2f exp2 log2)
AC_CHECK_FUNCS(floorf roundf ceilf truncf floor round ceil trunc)
AC_CHECK_FUNCS(poll inet_aton)

dnl Darwin seems to define mach_task_self() instead of task_self().
AC_CHECK_FUNCS(mach_task_self task_self)

dnl We need clock_gettime() for better performance but it may drag
dnl libpthread in, which we don't want for native ppc mode
case $EMULATED_PPC:$target_os in
no:linux*)
  ;;
*:*)
  AC_SEARCH_LIBS(clock_gettime, [rt posix4])
  AC_CHECK_FUNCS(clock_gettime clock_nanosleep)
  ;;
esac

dnl Check for headers and functions related to pty support (sshpty.c)
dnl From openssh-3.2.2p1 configure.ac
AC_CHECK_HEADERS(strings.h login.h sys/bsdtty.h sys/stat.h util.h pty.h)
AC_CHECK_FUNCS(_getpty vhangup strlcpy)

case "$host" in
*-*-hpux10.26)
        disable_ptmx_check=yes
        ;;
*-*-linux*)
        no_dev_ptmx=1
        ;;
mips-sony-bsd|mips-sony-newsos4)
        AC_DEFINE(HAVE_NEWS4, 1, [Define if you are on NEWS-OS (additions from openssh-3.2.2p1, for sshpty.c).])
        ;;
*-*-sco3.2v4*)
        no_dev_ptmx=1
        ;;
*-*-sco3.2v5*)
        no_dev_ptmx=1
        ;;
*-*-cygwin*)
        no_dev_ptmx=1
        ;;
esac

if test -z "$no_dev_ptmx" ; then
        if test "x$disable_ptmx_check" != "xyes" ; then
                AC_CHECK_FILE([/dev/ptmx],
                        [
                                AC_DEFINE_UNQUOTED(HAVE_DEV_PTMX, 1, [Define if you have /dev/ptmx.])
                                have_dev_ptmx=1
                        ]
                )
        fi
fi
AC_CHECK_FILE([/dev/ptc],
        [
                AC_DEFINE_UNQUOTED(HAVE_DEV_PTS_AND_PTC, 1, [Define if you have /dev/ptc.])
                have_dev_ptc=1
        ]
)
dnl (end of code from openssh-3.2.2p1 configure.ac)

dnl AC_CHECK_FRAMEWORK($1=NAME, $2=INCLUDES)
AC_DEFUN(AC_CHECK_FRAMEWORK, [
  AS_VAR_PUSHDEF([ac_Framework], [ac_cv_framework_$1])dnl
  AC_CACHE_CHECK([whether compiler supports framework $1],
    ac_Framework, [
    saved_LIBS="$LIBS"
    LIBS="$LIBS -framework $1"
    AC_TRY_LINK(
      [$2], [int main(void) { return 0; }],
      [AS_VAR_SET(ac_Framework, yes)], [AS_VAR_SET(ac_Framework, no); LIBS="$saved_LIBS"]
    )
  ])
  AS_IF([test AS_VAR_GET(ac_Framework) = yes],
    [AC_DEFINE(AS_TR_CPP(HAVE_FRAMEWORK_$1), 1, [Define if framework $1 is available.])]
  )
  AS_VAR_POPDEF([ac_Framework])dnl
])

dnl Check for some MacOS X frameworks
AC_CHECK_FRAMEWORK(Carbon, [#include <Carbon/Carbon.h>])
AC_CHECK_FRAMEWORK(IOKit, [#include <IOKit/IOKitLib.h>])

dnl Select system-dependant sources.
SERIALSRC=serial_unix.cpp
ETHERSRC=../dummy/ether_dummy.cpp
SCSISRC=../dummy/scsi_dummy.cpp
AUDIOSRC=../dummy/audio_dummy.cpp
EXTFSSRC=extfs_unix.cpp
EXTRASYSSRCS=
case "$target_os" in
linux*)
  ETHERSRC=ether_unix.cpp
  AUDIOSRC=audio_oss_esd.cpp
  SCSISRC=Linux/scsi_linux.cpp
  if [[ "x$EMULATED_PPC" = "xno" ]]; then
    EXTRASYSSRCS="paranoia.cpp Linux/sheepthreads.c ppc_asm.S"
  fi
  ;;
freebsd*)
  ETHERSRC=ether_unix.cpp
  ;;
netbsd*)
  ETHERSRC=ether_unix.cpp
  if [[ "x$EMULATED_PPC" = "xno" ]]; then
    EXTRASYSSRCS="paranoia.cpp NetBSD/sheepthreads.c ppc_asm.S"
  fi
  ;;
darwin*)
  ETHERSRC=ether_unix.cpp
  if [[ "x$EMULATED_PPC" = "xno" ]]; then
    EXTRASYSSRCS="paranoia.cpp ppc_asm.S"
  fi
  if [[ "x$ac_cv_framework_IOKit" = "xyes" ]]; then
    EXTRASYSSRCS="$EXTRASYSSRCS ../MacOSX/sys_darwin.cpp"
  fi
  if [[ "x$ac_cv_framework_Carbon" = "xyes" ]]; then
    EXTFSSRC=../MacOSX/extfs_macosx.mm
  fi
  ;;
esac

dnl Is the slirp library supported?
if [[ "x$ETHERSRC" = "xether_unix.cpp" ]]; then
  AC_DEFINE(HAVE_SLIRP, 1, [Define if slirp library is supported])
  SLIRP_SRCS="\
    ../slirp/bootp.c     ../slirp/ip_output.c  ../slirp/tcp_input.c  \
    ../slirp/cksum.c     ../slirp/mbuf.c       ../slirp/tcp_output.c \
    ../slirp/debug.c     ../slirp/misc.c       ../slirp/tcp_subr.c   \
    ../slirp/if.c        ../slirp/sbuf.c       ../slirp/tcp_timer.c  \
    ../slirp/ip_icmp.c   ../slirp/slirp.c      ../slirp/tftp.c       \
    ../slirp/ip_input.c  ../slirp/socket.c     ../slirp/udp.c"
fi
AC_SUBST(SLIRP_SRCS)

dnl SDL overrides
if [[ "x$WANT_SDL" = "xyes" ]]; then
  AC_DEFINE(USE_SDL, 1, [Define to enble SDL support.])
fi
if [[ "x$WANT_SDL_VIDEO" = "xyes" ]]; then
  AC_DEFINE(USE_SDL_VIDEO, 1, [Define to enable SDL video graphics support.])
  VIDEOSRCS="../SDL/video_sdl.cpp"
  KEYCODES="../SDL/keycodes"
  if [[ "x$ac_cv_framework_Carbon" = "xyes" ]]; then
    EXTRASYSSRCS="$EXTRASYSSRCS ../MacOSX/clip_macosx.cpp"
  else
    EXTRASYSSRCS="$EXTRASYSSRCS ../dummy/clip_dummy.cpp"
  fi
else
  VIDEOSRCS="video_x.cpp"
  KEYCODES="keycodes"
  EXTRASYSSRCS="$EXTRASYSSRCS clip_unix.cpp"
fi
if [[ "x$WANT_SDL_AUDIO" = "xyes" ]]; then
  AC_DEFINE(USE_SDL_AUDIO, 1, [Define to enable SDL audio support])
  AUDIOSRC="../SDL/audio_sdl.cpp"
fi

SYSSRCS="$VIDEOSRCS $EXTFSSRC $SERIALSRC $ETHERSRC $SCSISRC $AUDIOSRC $SEMSRC $UISRCS $EXTRASYSSRCS"

dnl Define a macro that translates a yesno-variable into a C macro definition
dnl to be put into the config.h file
dnl $1 -- the macro to define
dnl $2 -- the value to translate
dnl $3 -- template name
AC_DEFUN(AC_TRANSLATE_DEFINE, [
    if [[ "x$2" = "xyes" -o "x$2" = "xguessing yes" ]]; then
        AC_DEFINE($1, 1, $3)
    fi
])

dnl Check that the host supports TUN/TAP devices
AC_CACHE_CHECK([whether TUN/TAP is supported],
  ac_cv_tun_tap_support, [
  AC_TRY_COMPILE([
    #if defined(HAVE_LINUX_IF_H) && defined(HAVE_LINUX_IF_TUN_H)
    #include <linux/if.h>
    #include <linux/if_tun.h>
    #endif
    #if defined(HAVE_NET_IF_H) && defined(HAVE_NET_IF_TUN_H)
    #include <net/if.h>
    #include <net/if_tun.h>
    #endif
  ], [
    struct ifreq ifr;
    memset(&ifr, 0, sizeof(ifr));
    ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
  ],
  ac_cv_tun_tap_support=yes, ac_cv_tun_tap_support=no
  )
])
AC_TRANSLATE_DEFINE(ENABLE_TUNTAP, "$ac_cv_tun_tap_support",
  [Define if your system supports TUN/TAP devices.])

dnl Various checks if the system supports vm_allocate() and the like functions.
have_mach_vm=no
if [[ "x$ac_cv_func_vm_allocate" = "xyes" -a "x$ac_cv_func_vm_deallocate" = "xyes" -a \
      "x$ac_cv_func_vm_protect" = "xyes" ]]; then
  have_mach_vm=yes
fi
AC_TRANSLATE_DEFINE(HAVE_MACH_VM, "$have_mach_vm",
  [Define if your system has a working vm_allocate()-based memory allocator.])

dnl Check that vm_allocate(), vm_protect() work
if [[ "x$have_mach_vm" = "xyes" ]]; then

AC_CACHE_CHECK([whether vm_protect works],
  ac_cv_vm_protect_works, [
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  ac_cv_vm_protect_works=yes
  dnl First the tests that should segfault
  for test_def in NONE_READ NONE_WRITE READ_WRITE; do
    AC_TRY_RUN([
      #define CONFIGURE_TEST_VM_MAP
      #define TEST_VM_PROT_$test_def
      #include "vm_alloc.cpp"
    ], ac_cv_vm_protect_works=no, rm -f core,
    dnl When cross-compiling, do not assume anything
    ac_cv_vm_protect_works="guessing no"
    )
  done
  AC_TRY_RUN([
    #define CONFIGURE_TEST_VM_MAP
    #define TEST_VM_PROT_RDWR_WRITE
    #include "vm_alloc.cpp"
  ], , ac_cv_vm_protect_works=no,
  dnl When cross-compiling, do not assume anything
  ac_cv_vm_protect_works="guessing no"
  )
  AC_LANG_RESTORE
  ]
)

dnl Remove support for vm_allocate() if vm_protect() does not work
if [[ "x$have_mach_vm" = "xyes" ]]; then
  case $ac_cv_vm_protect_works in
    *yes) have_mach_vm=yes;;
    *no) have_mach_vm=no;;
  esac
fi
AC_TRANSLATE_DEFINE(HAVE_MACH_VM, "$have_mach_vm",
  [Define if your system has a working vm_allocate()-based memory allocator.])

fi dnl HAVE_MACH_VM

dnl Various checks if the system supports mmap() and the like functions.
dnl ... and Mach memory allocators are not supported
have_mmap_vm=no
if [[ "x$ac_cv_func_mmap" = "xyes" -a "x$ac_cv_func_munmap" = "xyes" -a \
      "x$ac_cv_func_mprotect" = "xyes" ]]; then
  if [[ "x$have_mach_vm" = "xno" ]]; then
    have_mmap_vm=yes
  fi
fi
AC_TRANSLATE_DEFINE(HAVE_MMAP_VM, "$have_mmap_vm",
  [Define if your system has a working mmap()-based memory allocator.])

dnl Check that mmap() and associated functions work.
if [[ "x$have_mmap_vm" = "xyes" ]]; then

dnl Check if we have a working anonymous mmap()
AC_CACHE_CHECK([whether mmap supports MAP_ANON],
  ac_cv_mmap_anon, [
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_RUN([
    #define HAVE_MMAP_ANON
    #define CONFIGURE_TEST_VM_MAP
    #define TEST_VM_MMAP_ANON
    #include "vm_alloc.cpp"
  ], ac_cv_mmap_anon=yes, ac_cv_mmap_anon=no,
  dnl When cross-compiling, do not assume anything.
  ac_cv_mmap_anon="guessing no"
  )
  AC_LANG_RESTORE
  ]
)
AC_TRANSLATE_DEFINE(HAVE_MMAP_ANON, "$ac_cv_mmap_anon",
  [Define if <sys/mman.h> defines MAP_ANON and mmap()'ing with MAP_ANON works.])

AC_CACHE_CHECK([whether mmap supports MAP_ANONYMOUS],
  ac_cv_mmap_anonymous, [
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_RUN([
    #define HAVE_MMAP_ANONYMOUS
    #define CONFIGURE_TEST_VM_MAP
    #define TEST_VM_MMAP_ANON
    #include "vm_alloc.cpp"
  ], ac_cv_mmap_anonymous=yes, ac_cv_mmap_anonymous=no,
  dnl When cross-compiling, do not assume anything.
  ac_cv_mmap_anonymous="guessing no"
  )
  AC_LANG_RESTORE
  ]
)
AC_TRANSLATE_DEFINE(HAVE_MMAP_ANONYMOUS, "$ac_cv_mmap_anonymous",
  [Define if <sys/mman.h> defines MAP_ANONYMOUS and mmap()'ing with MAP_ANONYMOUS works.])

AC_CACHE_CHECK([whether mprotect works],
  ac_cv_mprotect_works, [
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  ac_cv_mprotect_works=yes
  dnl First the tests that should segfault
  for test_def in NONE_READ NONE_WRITE READ_WRITE; do
    AC_TRY_RUN([
      #define CONFIGURE_TEST_VM_MAP
      #define TEST_VM_PROT_$test_def
      #include "vm_alloc.cpp"
    ], ac_cv_mprotect_works=no, rm -f core,
    dnl When cross-compiling, do not assume anything
    ac_cv_mprotect_works="guessing no"
    )
  done
  AC_TRY_RUN([
    #define CONFIGURE_TEST_VM_MAP
    #define TEST_VM_PROT_RDWR_WRITE
    #include "vm_alloc.cpp"
  ], , ac_cv_mprotect_works=no,
  dnl When cross-compiling, do not assume anything
  ac_cv_mprotect_works="guessing no"
  )
  AC_LANG_RESTORE
  ]
)

dnl Remove support for mmap() if mprotect() does not work
if [[ "x$have_mmap_vm" = "xyes" ]]; then
  case $ac_cv_mprotect_works in
    *yes) have_mmap_vm=yes;;
    *no) have_mmap_vm=no;;
  esac
fi
AC_TRANSLATE_DEFINE(HAVE_MMAP_VM, $have_mmap_vm,
  [Define if your system has a working mmap()-based memory allocator.])

fi dnl HAVE_MMAP_VM

dnl Check if we can modify the __PAGEZERO segment for use as Low Memory
AC_CACHE_CHECK([whether __PAGEZERO can be Low Memory area 0x0000-0x3000],
  ac_cv_pagezero_hack, [
  ac_cv_pagezero_hack=no 
  if AC_TRY_COMMAND([Darwin/testlmem.sh 0x3000]); then
    ac_cv_pagezero_hack=yes
    dnl might as well skip the test for mmap-able low memory
    ac_cv_can_map_lm=no
  fi
])
AC_TRANSLATE_DEFINE(PAGEZERO_HACK, "$ac_cv_pagezero_hack",
  [Define if the __PAGEZERO Mach-O Low Memory Globals hack works on this system.])

dnl Check if we can mmap 0x3000 bytes from 0x0000
AC_CACHE_CHECK([whether we can map Low Memory area 0x0000-0x3000],
  ac_cv_can_map_lm, [
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_RUN([
    #include "vm_alloc.cpp"
    int main(void) { /* returns 0 if we could map the lowmem globals */
      volatile char * lm = 0;
      if (vm_init() < 0) exit(1);
      if (vm_acquire_fixed(0, 0x2000) < 0) exit(1);
      lm[0] = 'z';
      if (vm_release((char *)lm, 0x2000) < 0) exit(1);
      vm_exit(); exit(0);
    }
  ], ac_cv_can_map_lm=yes, ac_cv_can_map_lm=no,
  dnl When cross-compiling, do not assume anything.
  ac_cv_can_map_lm="guessing no"
  )
  AC_LANG_RESTORE
  ]
)

dnl Check signal handlers need to be reinstalled
AC_CACHE_CHECK([whether signal handlers need to be reinstalled],
  ac_cv_signal_need_reinstall, [
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_RUN([
    #include <stdlib.h>
    #ifdef HAVE_UNISTD_H
    #include <unistd.h>
    #endif
    #include <signal.h>
    static int handled_signal = 0;
    RETSIGTYPE sigusr1_handler(int) { handled_signal++; }
    int main(void) { /* returns 0 if signals need not to be reinstalled */
      signal(SIGUSR1, sigusr1_handler); raise(SIGUSR1); raise(SIGUSR1);
      exit(handled_signal == 2);
    }
  ], ac_cv_signal_need_reinstall=yes, ac_cv_signal_need_reinstall=no,
  dnl When cross-compiling, do not assume anything.
  ac_cv_signal_need_reinstall="guessing yes"
  )
  AC_LANG_RESTORE
  ]
)
AC_TRANSLATE_DEFINE(SIGNAL_NEED_REINSTALL, "$ac_cv_signal_need_reinstall",
  [Define if your system requires signals to be reinstalled.])

dnl Check if sigaction handlers need to be reinstalled
AC_CACHE_CHECK([whether sigaction handlers need to be reinstalled],
  ac_cv_sigaction_need_reinstall, [
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_RUN([
    #include <stdlib.h>
    #ifdef HAVE_UNISTD_H
    #include <unistd.h>
    #endif
    #include <signal.h>
    static int handled_signal = 0;
    RETSIGTYPE sigusr1_handler(int) { handled_signal++; }
    typedef RETSIGTYPE (*signal_handler)(int);
    static signal_handler mysignal(int sig, signal_handler handler) {
      struct sigaction old_sa;
      struct sigaction new_sa;
      new_sa.sa_handler = handler;
      return ((sigaction(sig,&new_sa,&old_sa) < 0) ? SIG_IGN : old_sa.sa_handler);
    }
    int main(void) { /* returns 0 if signals need not to be reinstalled */
      mysignal(SIGUSR1, sigusr1_handler); raise(SIGUSR1); raise(SIGUSR1);
      exit(handled_signal == 2);
    }
  ], ac_cv_sigaction_need_reinstall=yes, ac_cv_sigaction_need_reinstall=no,
  dnl When cross-compiling, do not assume anything.
  ac_cv_sigaction_need_reinstall="guessing yes"
  )
  AC_LANG_RESTORE
  ]
)
AC_TRANSLATE_DEFINE(SIGACTION_NEED_REINSTALL, "$ac_cv_sigaction_need_reinstall",
  [Define if your system requires sigactions to be reinstalled.])

dnl Check if Mach exceptions supported.
AC_CACHE_CHECK([whether your system supports Mach exceptions],
  ac_cv_have_mach_exceptions, [
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_RUN([
    #define HAVE_MACH_EXCEPTIONS 1
    #define CONFIGURE_TEST_SIGSEGV_RECOVERY
    #include "vm_alloc.cpp"
    #include "sigsegv.cpp"
  ],
  ac_cv_have_mach_exceptions=yes,
  ac_cv_have_mach_exceptions=no,
  dnl When cross-compiling, do not assume anything.
  ac_cv_have_mach_exceptions=no
  )
  AC_LANG_RESTORE
  ]
)
if [[ "$ac_cv_have_mach_exceptions" = "yes" ]]; then
  sigsegv_recovery=mach
fi
AC_TRANSLATE_DEFINE(HAVE_MACH_EXCEPTIONS, "$ac_cv_have_mach_exceptions",
  [Define if your system supports Mach exceptions.])

dnl Check if Windows exceptions are supported.
AC_CACHE_CHECK([whether your system supports Windows exceptions],
  ac_cv_have_win32_exceptions, [
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_RUN([
    #define HAVE_WIN32_EXCEPTIONS 1
    #define CONFIGURE_TEST_SIGSEGV_RECOVERY
    #include "vm_alloc.cpp"
    #include "sigsegv.cpp"
  ], [
  sigsegv_recovery=win32
  ac_cv_have_win32_exceptions=yes
  ],
  ac_cv_have_win32_exceptions=no,
  dnl When cross-compiling, do not assume anything.
  ac_cv_have_win32_exceptions=no
  )
  AC_LANG_RESTORE
  ]
)
AC_TRANSLATE_DEFINE(HAVE_WIN32_EXCEPTIONS, "$ac_cv_have_win32_exceptions",
  [Define if your system supports Windows exceptions.])

dnl Otherwise, check if extended signals are supported.
if [[ -z "$sigsegv_recovery" ]]; then
  AC_CACHE_CHECK([whether your system supports extended signal handlers],
    ac_cv_have_extended_signals, [
    AC_LANG_SAVE
    AC_LANG_CPLUSPLUS
    AC_TRY_RUN([
      #define HAVE_SIGINFO_T 1
      #define CONFIGURE_TEST_SIGSEGV_RECOVERY
      #include "vm_alloc.cpp"
      #include "sigsegv.cpp"
    ],
    ac_cv_have_extended_signals=yes,
    ac_cv_have_extended_signals=no,
    dnl When cross-compiling, do not assume anything.
    ac_cv_have_extended_signals=no
    )
    AC_LANG_RESTORE
    ]
  )
  if [[ "$ac_cv_have_extended_signals" = "yes" ]]; then
    sigsegv_recovery=siginfo
  fi
  AC_TRANSLATE_DEFINE(HAVE_SIGINFO_T, "$ac_cv_have_extended_signals",
    [Define if your system support extended signals.])
fi

dnl Otherwise, check for subterfuges.
if [[ -z "$sigsegv_recovery" ]]; then
  AC_CACHE_CHECK([whether we then have a subterfuge for your system],
  ac_cv_have_sigcontext_hack, [
    AC_LANG_SAVE
    AC_LANG_CPLUSPLUS
    AC_TRY_RUN([
      #define HAVE_SIGCONTEXT_SUBTERFUGE 1
      #define CONFIGURE_TEST_SIGSEGV_RECOVERY
      #include "vm_alloc.cpp"
      #include "sigsegv.cpp"
    ],
    ac_cv_have_sigcontext_hack=yes,
    ac_cv_have_sigcontext_hack=no,
    dnl When cross-compiling, do not assume anything.
    ac_cv_have_sigcontext_hack=no
    )
    AC_LANG_RESTORE
  ])
  if [[ "$ac_cv_have_sigcontext_hack" = "yes" ]]; then
    sigsegv_recovery=sigcontext
  fi
  AC_TRANSLATE_DEFINE(HAVE_SIGCONTEXT_SUBTERFUGE, "$ac_cv_have_sigcontext_hack",
    [Define if we know a hack to replace siginfo_t->si_addr member.])
fi

dnl Check if we can ignore the fault (instruction skipping in SIGSEGV handler)
AC_CACHE_CHECK([whether we can skip instruction in SIGSEGV handler],
  ac_cv_have_skip_instruction, [
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_RUN([
    #define HAVE_SIGSEGV_SKIP_INSTRUCTION 1
    #define CONFIGURE_TEST_SIGSEGV_RECOVERY
    #include "vm_alloc.cpp"
    #include "sigsegv.cpp"
  ], ac_cv_have_skip_instruction=yes, ac_cv_have_skip_instruction=no,
  dnl When cross-compiling, do not assume anything.
  ac_cv_have_skip_instruction=no
  )
  AC_LANG_RESTORE
  ]
)
AC_TRANSLATE_DEFINE(HAVE_SIGSEGV_SKIP_INSTRUCTION, "$ac_cv_have_skip_instruction",
  [Define if we can ignore the fault (instruction skipping in SIGSEGV handler).])

dnl Can we do Video on SEGV Signals ?
CAN_VOSF=no
if [[ -n "$sigsegv_recovery" ]]; then
  CAN_VOSF=yes
fi

dnl Enable VOSF screen updates with this feature is requested and feasible
if [[ "x$WANT_VOSF" = "xyes" -a "x$CAN_VOSF" = "xyes" ]]; then
    AC_DEFINE(ENABLE_VOSF, 1, [Define if using video enabled on SEGV signals.])
else
    WANT_VOSF=no
fi

dnl Check addressing mode to use
AC_MSG_CHECKING([for addressing mode to use])
if [[ "$EMULATED_PPC" != "yes" ]]; then
  if [[ "$WANT_ADDRESSING_MODE" != "real" ]]; then
    AC_MSG_WARN([Running in native PowerPC mode, force use of Real Addressing.])
    WANT_ADDRESSING_MODE="real"
  fi
fi
if [[ "$WANT_ADDRESSING_MODE" = "direct" ]]; then
  if [[ -n "$NATMEM_OFFSET" ]]; then
    NATMEM_OFFSET_DEF="-DNATMEM_OFFSET=$NATMEM_OFFSET"
  fi
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  cat confdefs.h > conftest.$ac_ext
  cat >> conftest.$ac_ext << EOF
#include <stdio.h>
#include <string.h>
#include "vm_alloc.cpp"

int main(void)
{
        if (vm_init() < 0)
                return 1;

        static const struct {
                unsigned long base;
                unsigned int size;
        } ranges[[]] = {
                { 0x00000000, 0x0003000 },
                { 0x10000000, 0x2000000 },
                { 0x40800000, 0x0400000 },
                { 0x68070000, 0x0010000 },
                { 0x69000000, 0x0080000 },
                { 0x68ffe000, 0x0002000 },
                { 0x5fffe000, 0x0002000 },
                { 0x60000000, 0x0040000 },
        };
        const int n_ranges = sizeof(ranges)/ sizeof(ranges[[0]]);

#ifdef NATMEM_OFFSET
        unsigned long ofs = NATMEM_OFFSET;
#else
        for (unsigned long ofs = 0x10000000; ofs <= 0x90000000; ofs += 0x10000000)
#endif
        for (int i = 0; i < n_ranges; i++) {
                char *m = (char *)(ranges[[i]].base + ofs);
                if (vm_acquire_fixed(m, ranges[[i]].size) != 0)
                        break;
                memset(m, 0, ranges[[i]].size);
                vm_release(m, ranges[[i]].size);
                if (i == n_ranges - 1) {
                        if (sizeof(void *) == 8 && ofs > 0xffffffff)
                                printf("0x%lxul\n", ofs);
                        else
                                printf("0x%08x\n", ofs);
                        return 0;
                }
        }

        vm_exit();
        return 1;
}
EOF
  doit='$CXX conftest.$ac_ext -o conftest.$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS $LIBS $NATMEM_OFFSET_DEF >& AS_MESSAGE_LOG_FD'
  if AC_TRY_EVAL(doit); then
    NATMEM_OFFSET=`./conftest.$ac_exeext`
  else
    NATMEM_OFFSET=
  fi
  rm -f conftest*
  AC_LANG_RESTORE

  if [[ -z "$NATMEM_OFFSET" ]]; then
    AC_MSG_ERROR([could not determine a sensible NATMEM_OFFSET value])
  else
    WANT_ADDRESSING_MODE="direct,$NATMEM_OFFSET"
    AC_DEFINE_UNQUOTED(NATMEM_OFFSET, $NATMEM_OFFSET,
      [Define constant offset for Mac address translation])
  fi
fi
AC_MSG_RESULT($WANT_ADDRESSING_MODE)

dnl Utility macro used by next two tests.
dnl AC_EXAMINE_OBJECT(C source code,
dnl     commands examining object file,
dnl     [commands to run if compile failed]):
dnl
dnl Compile the source code to an object file; then convert it into a
dnl printable representation.  All unprintable characters and
dnl asterisks (*) are replaced by dots (.).  All white space is
dnl deleted.  Newlines (ASCII 0x10) in the input are preserved in the
dnl output, but runs of newlines are compressed to a single newline.
dnl Finally, line breaks are forcibly inserted so that no line is
dnl longer than 80 columns and the file ends with a newline.  The
dnl result of all this processing is in the file conftest.dmp, which
dnl may be examined by the commands in the second argument.
dnl
AC_DEFUN([gcc_AC_EXAMINE_OBJECT],
[AC_LANG_SAVE
AC_LANG_C
dnl Next bit cribbed from AC_TRY_COMPILE.
cat > conftest.$ac_ext <<EOF
[#line __oline__ "configure"
#include "confdefs.h"
$1
]EOF
if AC_TRY_EVAL(ac_compile); then
  od -c conftest.o |
    sed ['s/^[0-7]*[    ]*/ /
          s/\*/./g
          s/ \\n/*/g
          s/ [0-9][0-9][0-9]/./g
          s/  \\[^ ]/./g'] |
    tr -d '
 ' | tr -s '*' '
' | fold | sed '$a\
' > conftest.dmp
  $2
ifelse($3, , , else
  $3
)dnl
fi
rm -rf conftest*
AC_LANG_RESTORE])

dnl Floating point format probe.
dnl The basic concept is the same as the above: grep the object
dnl file for an interesting string.  We have to watch out for
dnl rounding changing the values in the object, however; this is
dnl handled by ignoring the least significant byte of the float.
dnl
dnl Does not know about VAX G-float or C4x idiosyncratic format.
dnl It does know about PDP-10 idiosyncratic format, but this is
dnl not presently supported by GCC.  S/390 "binary floating point"
dnl is in fact IEEE (but maybe we should have that in EBCDIC as well
dnl as ASCII?)
dnl
AC_DEFUN([gcc_AC_C_FLOAT_FORMAT],
[AC_CACHE_CHECK(floating point format, ac_cv_c_float_format,
[gcc_AC_EXAMINE_OBJECT(
[/* This will not work unless sizeof(double) == 8.  */
extern char sizeof_double_must_be_8 [sizeof(double) == 8 ? 1 : -1];

/* This structure must have no internal padding.  */
struct possibility {
  char prefix[8];
  double candidate;
  char postfix[8];
};

#define C(cand) { "\nformat:", cand, ":tamrof\n" }
struct possibility table [] =
{
  C( 3.25724264705901305206e+01), /* @@IEEEFP - IEEE 754 */
  C( 3.53802595280598432000e+18), /* D__float - VAX */
  C( 5.32201830133125317057e-19), /* D.PDP-10 - PDP-10 - the dot is 0x13a */
  C( 1.77977764695171661377e+10), /* IBMHEXFP - s/390 format, ascii */
  C(-5.22995989424860458374e+10)  /* IBMHEXFP - s/390 format, EBCDIC */
};],
 [if   grep 'format:.@IEEEF.:tamrof' conftest.dmp >/dev/null 2>&1; then
    ac_cv_c_float_format='IEEE (big-endian)'
  elif grep 'format:.I@@PFE.:tamrof' conftest.dmp >/dev/null 2>&1; then
    ac_cv_c_float_format='IEEE (big-endian)'
  elif grep 'format:.FEEEI@.:tamrof' conftest.dmp >/dev/null 2>&1; then
    ac_cv_c_float_format='IEEE (little-endian)'
  elif grep 'format:.EFP@@I.:tamrof' conftest.dmp >/dev/null 2>&1; then
    ac_cv_c_float_format='IEEE (little-endian)'
  elif grep 'format:.__floa.:tamrof' conftest.dmp >/dev/null 2>&1; then
    ac_cv_c_float_format='VAX D-float'
  elif grep 'format:..PDP-1.:tamrof' conftest.dmp >/dev/null 2>&1; then
    ac_cv_c_float_format='PDP-10'
  elif grep 'format:.BMHEXF.:tamrof' conftest.dmp >/dev/null 2>&1; then
    ac_cv_c_float_format='IBM 370 hex'
  else
    AC_MSG_ERROR(Unknown floating point format)
  fi],
  [AC_MSG_ERROR(compile failed)])
])
# IEEE is the default format.  If the float endianness isn't the same
# as the integer endianness, we have to set FLOAT_WORDS_BIG_ENDIAN
# (which is a tristate: yes, no, default).  This is only an issue with
# IEEE; the other formats are only supported by a few machines each,
# all with the same endianness.
format=IEEE_FLOAT_FORMAT
fbigend=
case $ac_cv_c_float_format in
    'IEEE (big-endian)' )
        if test $ac_cv_c_bigendian = no; then
            fbigend=1
        fi
        ;;
    'IEEE (little-endian)' )
        if test $ac_cv_c_bigendian = yes; then
            fbigend=0
        fi
        ;;
    'VAX D-float' )
        format=VAX_FLOAT_FORMAT
        ;;
    'PDP-10' )
        format=PDP10_FLOAT_FORMAT
        ;;
    'IBM 370 hex' )
        format=IBM_FLOAT_FORMAT
        ;;
esac
AC_DEFINE_UNQUOTED(HOST_FLOAT_FORMAT, $format,
  [Define to the floating point format of the host machine.])
if test -n "$fbigend"; then
        AC_DEFINE_UNQUOTED(HOST_FLOAT_WORDS_BIG_ENDIAN, $fbigend,
  [Define to 1 if the host machine stores floating point numbers in
   memory with the word containing the sign bit at the lowest address,
   or to 0 if it does it the other way around.

   This macro should not be defined if the ordering is the same as for
   multi-word integers.])
fi
])

dnl Check for host float format
gcc_AC_C_FLOAT_FORMAT

dnl Platform specific binary postprocessor
AC_PATH_PROG(BLESS, "true")
if [[ "x$ac_cv_pagezero_hack" = "xyes" ]]; then
  BLESS=Darwin/lowmem
  LDFLAGS="$LDFLAGS -pagezero_size 0x3000"
fi

dnl Check for GCC 2.7 or higher.
HAVE_GCC27=no
AC_MSG_CHECKING(for GCC 2.7 or higher)
AC_EGREP_CPP(xyes,
[#if __GNUC__ - 1 > 1 || __GNUC_MINOR__ - 1 > 5
  xyes
#endif
], [AC_MSG_RESULT(yes); HAVE_GCC27=yes], AC_MSG_RESULT(no))

dnl Check for GCC 3.0 or higher.
HAVE_GCC30=no
AC_MSG_CHECKING(for GCC 3.0 or higher)
AC_EGREP_CPP(xyes,
[#if __GNUC__ >= 3
  xyes
#endif
], [AC_MSG_RESULT(yes); HAVE_GCC30=yes], AC_MSG_RESULT(no))

dnl Check for ICC.
AC_MSG_CHECKING(for ICC)
HAVE_ICC=no
if $CXX -V -v 2>&1 | grep -q "Intel(R) C++ Compiler"; then
  HAVE_ICC=yes
fi
AC_MSG_RESULT($HAVE_ICC)

dnl Determine the generated object format
AC_CACHE_CHECK([the format of compiler generated objects],
  ac_cv_object_format, [
  echo 'int i;' > conftest.$ac_ext
  ac_cv_object_format=no
  if AC_TRY_EVAL(ac_compile); then
    case `/usr/bin/file conftest.$ac_objext` in
    *"ELF"*)
      ac_cv_object_format=elf
      ;;
    *"Mach-O"*)
      ac_cv_object_format=mach
      ;;
    *)
      ac_cv_object_format=unknown
      ;;
    esac
  fi
  rm -rf conftest*
])

dnl Add -fno-strict-aliasing for slirp sources
if [[ "x$HAVE_GCC30" = "xyes" ]]; then
  SAVED_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS -fno-strict-aliasing"
  AC_CACHE_CHECK([whether the compiler supports -fno-strict-aliasing],
    ac_cv_gcc_no_strict_aliasing, [
    AC_TRY_COMPILE([],[],
      [ac_cv_gcc_no_strict_aliasing=yes; AC_SUBST(SLIRP_CFLAGS, "-fno-strict-aliasing")],
      [ac_cv_gcc_no_strict_aliasing=no])
  ])
  CFLAGS="$SAVED_CFLAGS"
fi

dnl Add -mdynamic-no-pic for MacOS X
if [[ "x$HAVE_GCC30" = "xyes" ]]; then
  SAVED_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS -mdynamic-no-pic"
  AC_CACHE_CHECK([whether the compiler supports -mdynamic-no-pic],
    ac_cv_gcc_mdynamic_no_pic, [
    AC_TRY_COMPILE([],[],[ac_cv_gcc_mdynamic_no_pic=yes],[ac_cv_gcc_mdynamic_no_pic=no])
  ])
  if [[ "x$ac_cv_gcc_mdynamic_no_pic" = "xyes" ]]; then
    CXXFLAGS="$CXXFLAGS -mdynamic-no-pic"
  else
    CFLAGS="$SAVED_CFLAGS"
  fi
fi

dnl CPU emulator sources
if [[ "x$EMULATED_PPC" = "xyes" ]]; then
  CPUSRCS="\
    ../kpx_cpu/src/mathlib/ieeefp.cpp \
    ../kpx_cpu/src/mathlib/mathlib.cpp \
    ../kpx_cpu/src/cpu/ppc/ppc-cpu.cpp \
    ../kpx_cpu/src/cpu/ppc/ppc-decode.cpp \
    ../kpx_cpu/src/cpu/ppc/ppc-execute.cpp \
    ../kpx_cpu/src/cpu/ppc/ppc-translate.cpp"
  CPPFLAGS="$CPPFLAGS -I../kpx_cpu/include -I../kpx_cpu/src"

  dnl Enable JIT compiler, if possible
  if [[ "x$WANT_JIT" = "xyes" ]]; then
    AC_CACHE_CHECK([whether dyngen can be used],
      ac_cv_use_dyngen, [
      case $host_cpu:$ac_cv_object_format in
      powerpc:elf)
        ac_cv_use_dyngen=yes
        ;;
      x86_64:elf)
        ac_cv_use_dyngen=yes
        ;;
      i?86:elf)
        ac_cv_use_dyngen=yes
        ;;
      powerpc:mach)
        ac_cv_use_dyngen=yes
        ;;
      *:*)
        ac_cv_use_dyngen=no
        ;;
      esac
      dnl Check for a suitable synthetic opcodes compiler (icc is faking itself as gcc 3.2.2)
      if [[ -z "$DYNGEN_CC" ]]; then
        if [[ "x$HAVE_GCC27" = "xyes" -a "x$HAVE_ICC" = "xno" ]]; then
          DYNGEN_CC=$CXX
        else
          for p in /usr/bin /usr/local/bin; do
            gxx="$p/g++"
            if [[ -x "$gxx" ]]; then
              DYNGEN_CC="$gxx"
            fi
          done
        fi
      fi
      if [[ -z "$DYNGEN_CC" ]]; then
        ac_cv_use_dyngen=no
      fi
    ])
    if [[ "x$ac_cv_use_dyngen" = "xyes" ]]; then
      case $host_cpu in
      i?86)
        DYNGEN_OP_FLAGS="-fomit-frame-pointer -mpreferred-stack-boundary=2"
        ;;
      powerpc)
        if [[ "x$ac_cv_object_format" = "xmach" ]]; then
          DYNGEN_OP_FLAGS="-mdynamic-no-pic"
        fi
        ;;
      esac
      if [[ "x$HAVE_GCC30" = "xyes" ]]; then
        DYNGEN_OP_FLAGS="$DYNGEN_OP_FLAGS -falign-functions=0"
      else
        DYNGEN_OP_FLAGS="$DYNGEN_OP_FLAGS -malign-functions=0"
      fi
      DYNGEN_OP_FLAGS="$DYNGEN_OP_FLAGS -finline-limit=10000 -fno-exceptions -g0"
      if [[ "x$HAVE_GCC30" = "xyes" ]]; then
        DYNGEN_OP_FLAGS="$DYNGEN_OP_FLAGS -fno-reorder-blocks -fno-optimize-sibling-calls"
      fi
    else
      WANT_JIT=no
    fi
    AC_TRANSLATE_DEFINE(ENABLE_DYNGEN, $ac_cv_use_dyngen, [Define to enable dyngen engine])
    if [[ "x$WANT_JIT" = "xyes" ]]; then
      DYNGENSRCS="\
        ../kpx_cpu/src/cpu/jit/dyngen.c \
        ../kpx_cpu/src/cpu/jit/cxxdemangle.cpp"
      CPUSRCS="\
        ../kpx_cpu/src/cpu/jit/jit-cache.cpp \
        ../kpx_cpu/src/cpu/jit/basic-dyngen.cpp \
        ../kpx_cpu/src/cpu/ppc/ppc-dyngen.cpp $CPUSRCS"
    fi
  fi
  CPUSRCS="$CPUSRCS ../kpx_cpu/sheepshaver_glue.cpp"
else
  WANT_JIT=no
fi
if [[ "x$ac_cv_use_dyngen" = "xyes" ]]; then
  AC_CACHE_CHECK([whether static data regions are executable],
    ac_cv_have_static_data_exec, [
    AC_TRY_RUN([int main(void) {
#if defined(__powerpc__) || defined(__ppc__)
      static unsigned int p[8] = {0x4e800020,};
      asm volatile("dcbst 0,%0" : : "r" (p) : "memory");
      asm volatile("sync" : : : "memory");
      asm volatile("icbi 0,%0" : : "r" (p) : "memory");
      asm volatile("sync" : : : "memory");
      asm volatile("isync" : : : "memory");
      ((void (*)(void))p)();
      return 0;
#endif
      return 1;
    }], ac_cv_have_static_data_exec=yes, ac_cv_have_static_data_exec=no,
    dnl When cross-compiling, do not assume anything.
    ac_cv_have_static_data_exec=no
    )
  ])
else
  ac_cv_use_dyngen=no
fi
AC_TRANSLATE_DEFINE(HAVE_STATIC_DATA_EXEC, "$ac_cv_have_static_data_exec",
  [Define if your system marks static data pages as executable.])

if [[ "x$WANT_JIT" = "xyes" ]]; then
  CPPFLAGS="$CPPFLAGS -DUSE_JIT"
fi

dnl Generate Makefile.
AC_SUBST(PERL)
AC_SUBST(USE_DYNGEN, [$ac_cv_use_dyngen])
AC_SUBST(DYNGENSRCS)
AC_SUBST(DYNGEN_CC)
AC_SUBST(DYNGEN_OP_FLAGS)
AC_SUBST(SYSSRCS)
AC_SUBST(CPUSRCS)
AC_SUBST(BLESS)
AC_SUBST(KEYCODES)
AC_OUTPUT([
Makefile
../MacOSX/Info.plist
])

dnl Print summary.
echo
echo SheepShaver configuration summary:
echo
echo SDL support ...................... : $SDL_SUPPORT
echo FBDev DGA support ................ : $WANT_FBDEV_DGA
echo XFree86 DGA support .............. : $WANT_XF86_DGA
echo XFree86 VidMode support .......... : $WANT_XF86_VIDMODE
echo Using PowerPC emulator ........... : $EMULATED_PPC
echo Enable JIT compiler .............. : $WANT_JIT
echo Enable video on SEGV signals ..... : $WANT_VOSF
echo ESD sound support ................ : $WANT_ESD
echo GTK user interface ............... : $WANT_GTK
echo mon debugger support ............. : $WANT_MON
echo Addressing mode .................. : $WANT_ADDRESSING_MODE
echo Bad memory access recovery type .. : $sigsegv_recovery
echo
echo "Configuration done. Now type \"make\"."
Revision:	1.35
Committed:	2005-07-04T06:09:59Z (18 years, 11 months ago) by gbeauche
Branch:	MAIN
Changes since 1.34:	+3 -3 lines
Log Message:	New paranoia checks that better match was SheepShaver is doing with threads and sigaltstack(). At least, this time we force use of threads and also alter r1 to see whether the current threading model relies on it or not.