macemu/BasiliskII/src/Unix/configure.in

dnl Process this file with autoconf to produce a configure script.
dnl Written in 1999 by Christian Bauer et al.

AC_INIT(main_unix.cpp)
AC_PREREQ(2.12)
AC_CONFIG_HEADER(config.h)

dnl Options.
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(fbdev-dga,     [  --enable-fbdev-dga      use direct frame buffer access via /dev/fb [default=yes]], [WANT_FBDEV_DGA=$enableval], [WANT_FBDEV_DGA=yes])
AC_ARG_ENABLE(vosf,          [  --enable-vosf           enable video on SEGV signals [default=no]], [WANT_VOSF=$enableval], [WANT_VOSF=no])

dnl FPU emulation core.
AC_ARG_ENABLE(fpe,
[  --enable-fpe=which      specify which fpu emulator to use [default=opt]],
[ case "$enableval" in
    default)	FPE_CORE="default";; dnl fpu_x86.cpp if i386 architecture, fpu_uae.cpp otherwise
	uae)		FPE_CORE="uae";;
	*)			AC_MSG_ERROR([--enable-fpe takes only one of the following values: default, uae]);;
  esac
],
[ FPE_CORE="default"
])

dnl Addressing modes.
AC_ARG_ENABLE(addressing,
[  --enable-addressing=AM  specify the addressing mode to use [default=fastest]],
[ case "$enableval" in
    real) 	ADDRESSING_TEST_ORDER="real";;
    direct)	ADDRESSING_TEST_ORDER="direct";;
    banks)	ADDRESSING_TEST_ORDER="banks";;
    fastest)ADDRESSING_TEST_ORDER="direct banks";;
    *)		AC_MSG_ERROR([--enable-addressing takes only one of the following values: fastest, real, direct, banks]);;
  esac
],
[ ADDRESSING_TEST_ORDER="direct banks"
])

dnl External packages.
AC_ARG_WITH(esd,             [  --with-esd              support ESD for sound under Linux/FreeBSD [default=yes]], [WANT_ESD=$withval], [WANT_ESD=yes])
AC_ARG_WITH(gtk,             [  --with-gtk              use GTK user interface [default=yes]], [WANT_GTK=$withval], [WANT_GTK=yes])
AC_ARG_WITH(mon,             [  --with-mon              use mon as debugger [default=yes]], [WANT_MON=$withval], [WANT_MON=yes])

dnl Canonical system information.
AC_CANONICAL_HOST
AC_CANONICAL_TARGET

dnl Target OS type (target is host if not cross-compiling).
case "$target_os" in
  linux*)	OS_TYPE=linux;;
  netbsd*)	OS_TYPE=netbsd;;
  freebsd*)	OS_TYPE=freebsd;;
  solaris*)	OS_TYPE=solaris;;
  *)		OS_TYPE=`echo $target_os | sed -e 's/-/_/' | sed -e 's/\./_/'`;;
esac
DEFINES="$DEFINES -DOS_$OS_TYPE"

dnl Target CPU type.
HAVE_I386=no
HAVE_M68K=no
HAVE_SPARC=no
HAVE_POWERPC=no
case "$target_cpu" in
  i386* | i486* | i586* | i686* | i786* ) CPU_TYPE=i386 HAVE_I386=yes;;
  m68k* ) CPU_TYPE=m68k HAVE_M68K=yes;;
  sparc* ) CPU_TYPE=sparc HAVE_SPARC=yes;;
  powerpc* ) CPU_TYPE=powerpc HAVE_POWERPC=yes;;
  *) CPU_TYPE=`echo $target_cpu | sed -e 's/-/_/'`;;
esac
DEFINES="$DEFINES -DCPU_$CPU_TYPE"

dnl Checks for programs.
AC_PROG_CC
AC_PROG_CC_C_O
AC_PROG_CPP
AC_PROG_CXX
AC_PROG_MAKE_SET
AC_PROG_INSTALL

dnl We use mon if possible.
MONSRCS=
if [[ "x$WANT_MON" = "xyes" ]]; then
  AC_MSG_CHECKING(for mon)
  mon_srcdir=../../../mon/src
  if grep mon_init $mon_srcdir/mon.h >/dev/null 2>/dev/null; then
    AC_MSG_RESULT(yes)
    AC_DEFINE(ENABLE_MON)
    MONSRCS="$mon_srcdir/mon.cpp $mon_srcdir/mon_6502.cpp $mon_srcdir/mon_z80.cpp $mon_srcdir/mon_cmd.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(readline, readline)
    AC_CHECK_LIB(termcap, tputs)
    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

dnl Checks for libraries.
AC_CHECK_LIB(posix4, sem_init)

dnl We need X11.
AC_PATH_XTRA
if [[ "x$no_x" = "xyes" ]]; then
  AC_MSG_ERROR([You need X11 to run Basilisk II.])
fi
CFLAGS="$CFLAGS $X_CFLAGS"
CXXFLAGS="$CXXFLAGS $X_CFLAGS"
LIBS="$LIBS $X_PRE_LIBS $X_LIBS -lX11 -lXext $X_EXTRA_LIBS"

dnl We want pthreads. Try libpthread first, then libc_r (FreeBSD), then PTL.
HAVE_PTHREADS=yes
AC_CHECK_LIB(pthread, pthread_create, , [
  AC_CHECK_LIB(c_r, pthread_create, , [
    AC_CHECK_LIB(PTL, pthread_create, , [
      HAVE_PTHREADS=no
    ])
  ])
])
if [[ "x$HAVE_PTHREADS" = "xyes" ]]; then
  AC_DEFINE(HAVE_PTHREADS)
fi
AC_CHECK_FUNCS(pthread_cancel)

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
])

dnl We use DGA (XFree86 or fbdev) if possible.
if [[ "x$WANT_XF86_DGA" = "xyes" ]]; then
  AC_CHECK_LIB(Xxf86dga, XF86DGAQueryExtension, [
    AC_DEFINE(ENABLE_XF86_DGA)
    LIBS="$LIBS -lXxf86dga"
    if [[ "x$WANT_FBDEV_DGA" = "xyes" ]]; then
      AC_MSG_WARN([Cannot have both --enable-xf86-dga and --enable-fbdev-dga, ignoring --enable-fbdev-dga.])
      WANT_FBDEV_DGA=no
    fi
  ], [
    AC_MSG_WARN([Could not find XFree86 DGA extension, ignoring --enable-xf86-dga.])
    WANT_XF86_DGA=no
  ])
fi
if [[ "x$WANT_FBDEV_DGA" = "xyes" ]]; then
  AC_DEFINE(ENABLE_FBDEV_DGA)
fi

dnl We use XFree86 VidMode if possible.
if [[ "x$WANT_XF86_VIDMODE" = "xyes" ]]; then
  AC_CHECK_LIB(Xxf86vm, XF86VidModeQueryExtension, [
    AC_DEFINE(ENABLE_XF86_VIDMODE)
    LIBS="$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
if [[ "x$WANT_GTK" = "xyes" ]]; then
  AM_PATH_GTK(1.2.0, [
    AC_DEFINE(ENABLE_GTK)
    CFLAGS="$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$WANT_ESD" = "xyes" ]]; then
  AM_PATH_ESD(0.2.8, [
    AC_DEFINE(ENABLE_ESD)
    CFLAGS="$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 Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS(unistd.h fcntl.h sys/time.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(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 Checks for library functions.
AC_CHECK_FUNCS(strdup cfmakeraw)
AC_CHECK_FUNCS(clock_gettime timer_create)

dnl Select system-dependant source files.
SERIALSRC=serial_unix.cpp
ETHERSRC=../dummy/ether_dummy.cpp
SCSISRC=../dummy/scsi_dummy.cpp
AUDIOSRC=../dummy/audio_dummy.cpp
EXTRASYSSRCS=
CAN_NATIVE_M68K=no
case "$target_os" in
linux*)
  ETHERSRC=Linux/ether_linux.cpp
  SCSISRC=Linux/scsi_linux.cpp
  AUDIOSRC=audio_oss_esd.cpp
  ;;
freebsd*3.*)
  AUDIOSRC=audio_oss_esd.cpp
  DEFINES="$DEFINES -DBSD_COMP"
  dnl Check for the CAM library
  AC_CHECK_LIB(cam, cam_open_btl, HAVE_LIBCAM=yes, HAVE_LIBCAM=no) 
  if [[ "x$HAVE_LIBCAM" = "xno" ]]; then
    AC_MSG_WARN([Cannot find libcam for SCSI management, disabling SCSI support.])
  else
    dnl Check for the sys kernel includes
    AC_CHECK_HEADER(/sys/cam/cam.h)
    if [[ "x$ac_cv_header__sys_cam_cam_h" = "xno" ]]; then
      dnl In this case I should fix this thing including a "patch"
      dnl to access directly to the functions in the kernel :) --Orlando
      AC_MSG_WARN([Cannot find kernel includes for CAM library, disabling SCSI support.])
    else
      SCSISRC=FreeBSD/scsi_freebsd.cpp
      CXXFLAGS="$CXXFLAGS -I/sys"
      CFLAGS="$CFLAGS -I/sys"
      LIBS="$LIBS -lcam"
      DEFINES="$DEFINES -DCAM"
    fi
  fi
  ;;
freebsd*)
  DEFINES="$DEFINES -DBSD_COMP"
  dnl Check for the SCSI library
  AC_CHECK_LIB(scsi, scsi_open, HAVE_LIBSCSI=yes, HAVE_LIBSCSI=no)
  if [[ "x$HAVE_LIBSCSI" = "xno" ]]; then
    AC_MSG_WARN([Cannot find libscsi for SCSI management, disabling SCSI support.])
  else
    dnl Check for the sys kernel includes
    AC_CHECK_HEADER(scsi.h sys/scsiio.h)
    if [[ "x$ac_cv_header_scsi_h" = "xno" ]]; then
      AC_MSG_WARN([Cannot find includes for the SCSI library, disabling SCSI support.])
    else
      SCSISRC=FreeBSD/scsi_freebsd.cpp
      LIBS="$LIBS -lscsi"
    fi
  fi
  ;;
netbsd*)
  CAN_NATIVE_M68K=yes
  ;;
solaris*)
  AUDIOSRC=Solaris/audio_solaris.cpp
  DEFINES="$DEFINES -DBSD_COMP -D_POSIX_PTHREAD_SEMANTICS"
  ;;
irix*)
  AUDIOSRC=Irix/audio_irix.cpp
  EXTRASYSSRCS=Irix/unaligned.c
  dnl IRIX headers work fine, but somehow don't define or use "STDC_HEADERS"
  DEFINES="$DEFINES -DCRTSCTS=CNEW_RTSCTS -DB230400=B115200 -DSTDC_HEADERS"
  LIBS="$LIBS -laudio"
  ;;
esac

dnl Use 68k CPU natively?
WANT_NATIVE_M68K=no
if [[ "x$HAVE_M68K" = "xyes" -a "x$CAN_NATIVE_M68K" = "xyes" ]]; then
  AC_DEFINE(ENABLE_NATIVE_M68K)
  WANT_NATIVE_M68K=yes
fi

if [[ "x$HAVE_PTHREADS" = "xno" ]]; then
  dnl Serial, ethernet and audio support needs pthreads
  AC_MSG_WARN([You don't have pthreads, disabling serial, ethernet and audio support.])
  SERIALSRC=../dummy/serial_dummy.cpp
  ETHERSRC=../dummy/ether_dummy.cpp
  AUDIOSRC=../dummy/audio_dummy.cpp
fi
SYSSRCS="$SERIALSRC $ETHERSRC $SCSISRC $AUDIOSRC $SEMSRC $UISRCS $MONSRCS $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
AC_DEFUN(AC_TRANSLATE_DEFINE, [
    if [[ "x$2" = "xyes" ]]; then
        AC_DEFINE($1)
    fi
])

dnl Check if we can mmap 0x2000 bytes from 0x0000
AC_CACHE_CHECK("whether we can map Low Memory area 0x0000-0x2000",
  ac_cv_can_map_lm, [
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_RUN([
    #include <unistd.h>
    #include <fcntl.h>
    #include <sys/mman.h>
    
    int main()
    { int zero_fd; char * lm;
      if ((zero_fd = open("/dev/zero", O_RDWR)) < 0) exit(1);
      if ((lm = (char *)mmap((caddr_t)0x0000, 0x2000, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, zero_fd, 0)) == MAP_FAILED) exit(1);
      lm[0] = 0x12;
	  munmap(lm, 0x2000);
      close(zero_fd);
      exit(0);
    }
  ],
  [ac_cv_can_map_lm=yes],
  [ac_cv_can_map_lm=no]
  )
  AC_LANG_RESTORE
  ]
)

dnl Check if extended signals are supported.
AC_CACHE_CHECK("whether your system supports extended signal handlers",
  ac_cv_have_extended_signals, [
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_RUN([
    #include <unistd.h>
    #include <stdlib.h>
    #include <signal.h>
    #include <fcntl.h>
    #include <sys/mman.h>

    static volatile caddr_t mem = 0;
    static int zero_fd = -1;

    static RETSIGTYPE segfault_handler(int, siginfo_t * sip, void *)
    { if ((caddr_t)(sip->si_addr) != mem) exit(1);
      munmap(mem, getpagesize()); close(zero_fd); exit(0); }

    int main()
    { if ((zero_fd = open("/dev/zero", O_RDWR)) < 0) exit(1);
      if ((mem = (caddr_t)mmap(0, getpagesize(), PROT_READ, MAP_PRIVATE, zero_fd, 0)) == (caddr_t)MAP_FAILED) exit(1);
      struct sigaction sa; sa.sa_sigaction = segfault_handler; sa.sa_flags = SA_SIGINFO;
      sigaction(SIGSEGV, &sa, 0);
      mem[0] = 0;
      exit(1); // should not be reached
    }
  ],
  [ac_cv_have_extended_signals=yes],
  [ac_cv_have_extended_signals=no]
  )
  AC_LANG_RESTORE
  ]
)
AC_TRANSLATE_DEFINE(HAVE_SIGINFO_T, "$ac_cv_have_extended_signals")
 
dnl Otherwise, check for subterfuges.
if [[ "x$ac_cv_have_extended_signals" = "xno" ]]; then
  case "$target_os" in
    linux*)
      if [[ "x$HAVE_I386" = "xyes" ]]; 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([
            #include <unistd.h>
            #include <signal.h>
            #include <fcntl.h>
            #include <sys/mman.h>

            static volatile caddr_t mem = 0;
            static int zero_fd = -1;

            static RETSIGTYPE segfault_handler(int, struct sigcontext scs)
            { if ((caddr_t)(scs.cr2) != mem) exit(1);
              munmap(mem, getpagesize()); close(zero_fd); exit(0); }

            int main()
            { if ((zero_fd = open("/dev/zero", O_RDWR)) < 0) exit(1);
              if ((mem = (caddr_t)mmap(0, getpagesize(), PROT_READ, MAP_PRIVATE, zero_fd, 0)) == (caddr_t)MAP_FAILED) exit(1);
              struct sigaction sa; sa.sa_flags = 0;
              sa.sa_handler = (RETSIGTYPE (*)(int))segfault_handler;
              sigaction(SIGSEGV, &sa, 0);
              mem[0] = 0;
              exit(1); // should not be reached
            }
          ],
          [ac_cv_have_sigcontext_hack=yes],
          [ac_cv_have_sigcontext_hack=no]
          )
          AC_LANG_RESTORE
        ])
        AC_TRANSLATE_DEFINE(HAVE_SIGCONTEXT_SUBTERFUGE, $ac_cv_have_sigcontext_hack)
      elif [[ "x$HAVE_POWERPC" = "xyes" ]]; 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([
            #include <unistd.h>
            #include <signal.h>
            #include <fcntl.h>
            #include <sys/mman.h>

            static volatile caddr_t mem = 0;
            static int zero_fd = -1;

            static RETSIGTYPE segfault_handler(int, struct sigcontext_struct *scs)
            { if ((caddr_t)(scs->regs->dar) != mem) exit(1);
              munmap(mem, getpagesize()); close(zero_fd); exit(0); }

            int main()
            { if ((zero_fd = open("/dev/zero", O_RDWR)) < 0) exit(1);
              if ((mem = (caddr_t)mmap(0, getpagesize(), PROT_READ, MAP_PRIVATE, zero_fd, 0)) == (caddr_t)MAP_FAILED) exit(1);
              struct sigaction sa; sa.sa_flags = 0;
              sa.sa_handler = (RETSIGTYPE (*)(int))segfault_handler;
              sigaction(SIGSEGV, &sa, 0);
              mem[0] = 0;
              exit(1); // should not be reached
            }
          ],
          [ac_cv_have_sigcontext_hack=yes],
          [ac_cv_have_sigcontext_hack=no]
          )
          AC_LANG_RESTORE
        ])
        AC_TRANSLATE_DEFINE(HAVE_SIGCONTEXT_SUBTERFUGE, $ac_cv_have_sigcontext_hack)
      fi
      ;;
    netbsd*)
      if [[ "x$HAVE_M68K" = "xyes" ]]; 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([
            #include <unistd.h>
            #include <signal.h>
            #include <fcntl.h>
            #include <sys/mman.h>

            static volatile caddr_t mem = 0;
            static int zero_fd = -1;

            static RETSIGTYPE segfault_handler(int, int code)
            { if ((caddr_t)code != mem) exit(1);
              munmap(mem, getpagesize()); close(zero_fd); exit(0); }

            int main()
            { if ((zero_fd = open("/dev/zero", O_RDWR)) < 0) exit(1);
              if ((mem = (caddr_t)mmap(0, getpagesize(), PROT_READ, MAP_PRIVATE, zero_fd, 0)) == (caddr_t)MAP_FAILED) exit(1);
              struct sigaction sa; sa.sa_flags = 0;
              sa.sa_handler = (RETSIGTYPE (*)(int))segfault_handler;
              sigaction(SIGSEGV, &sa, 0);
              mem[0] = 0;
              exit(1); // should not be reached
            }
          ],
          [ac_cv_have_sigcontext_hack=yes],
          [ac_cv_have_sigcontext_hack=no]
          )
          AC_LANG_RESTORE
        ])
        AC_TRANSLATE_DEFINE(HAVE_SIGCONTEXT_SUBTERFUGE, $ac_cv_have_sigcontext_hack)
      fi
    ;;
  esac
fi

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

dnl Determine the addressing mode to use
if [[ "x$WANT_NATIVE_M68K" = "xyes" ]]; then
  ADDRESSING_MODE="real"
else
  ADDRESSING_MODE=""
  AC_MSG_CHECKING([for the addressing mode to use])
  for am in $ADDRESSING_TEST_ORDER; do
    case $am in
    real)
      dnl Requires ability to mmap() Low Memory globals
      if [[ "x$ac_cv_can_map_lm" = "xno" ]]; then
        continue
      fi
	  dnl Requires VOSF screen updates
      if [[ "x$CAN_VOSF" = "xno" ]]; then
        continue
      fi
      dnl Real addressing will probably work.
      ADDRESSING_MODE="real"
      WANT_VOSF=yes dnl we can use VOSF and we need it actually
      DEFINES="$DEFINES -DREAL_ADDRESSING"
      break
      ;;
    direct)
      dnl Requires VOSF screen updates
      if [[ "x$CAN_VOSF" = "xyes" ]]; then
        ADDRESSING_MODE="direct"
        WANT_VOSF=yes dnl we can use VOSF and we need it actually
        DEFINES="$DEFINES -DDIRECT_ADDRESSING"
        break
      fi
      ;;
    banks)
      dnl Default addressing mode
      ADDRESSING_MODE="memory banks"
      break
      ;;
    *)
      AC_MSG_ERROR([Internal configure.in script error for $am addressing mode])
    esac
  done
  AC_MSG_RESULT($ADDRESSING_MODE)
  if [[ "x$ADDRESSING_MODE" = "x" ]]; then
    AC_MSG_WARN([Sorry, no suitable addressing mode in $ADDRESSING_TEST_ORDER])
    ADDRESSING_MODE="memory banks"
  fi
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)
else
    WANT_VOSF=no
fi

dnl Check for GAS.
HAVE_GAS=no
AC_MSG_CHECKING(for GAS .p2align feature)
cat >conftest.S << EOF
	.text
	.p2align 5
EOF
if $CC conftest.S -c -o conftest.o >/dev/null 2>&1 ; then HAVE_GAS=yes; fi
AC_MSG_RESULT($HAVE_GAS)

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

dnl Set "-fomit-frame-pointer" on i386 GCC 2.7 or higher.
if [[ "x$HAVE_GCC27" = "xyes" -a "x$HAVE_I386" = "xyes" ]]; then
  CFLAGS="$CFLAGS -fomit-frame-pointer"
  CXXFLAGS="$CXXFLAGS -fomit-frame-pointer"
fi

dnl Select appropriate CPU source and REGPARAM define.
ASM_OPTIMIZATIONS=none
CPUSRCS="cpuemu1.cpp cpuemu2.cpp cpuemu3.cpp cpuemu4.cpp cpuemu5.cpp cpuemu6.cpp cpuemu7.cpp cpuemu8.cpp"
FPUSRCS="../uae_cpu/fpp.cpp"
if [[ "x$HAVE_GCC27" = "xyes" -a "x$HAVE_I386" = "xyes" ]]; then
  dnl i386 CPU
  DEFINES="$DEFINES -DREGPARAM=\"__attribute__((regparm(3)))\""
  if [[ "x$HAVE_GAS" = "xyes" ]]; then
    ASM_OPTIMIZATIONS=i386
    DEFINES="$DEFINES -DX86_ASSEMBLY -DUNALIGNED_PROFITABLE -DOPTIMIZED_FLAGS"
    CPUSRCS="cpufast1.s cpufast2.s cpufast3.s cpufast4.s cpufast5.s cpufast6.s cpufast7.s cpufast8.s"
    FPUSRCS="../uae_cpu/fpu_x86.cpp"
  fi
elif [[ "x$HAVE_GCC27" = "xyes" -a "x$HAVE_SPARC" = "xyes" -a "x$HAVE_GAS" = "xyes" ]]; then
  dnl SPARC CPU
  case "$target_os" in
  solaris*)
    AC_MSG_CHECKING(SPARC CPU architecture)
    SPARC_TYPE=`Solaris/which_sparc`
    AC_MSG_RESULT($SPARC_TYPE)
    case "$SPARC_TYPE" in
    SPARC_V8)
      ASM_OPTIMIZATIONS="SPARC V8 architecture"
      DEFINES="$DEFINES -DSPARC_V8_ASSEMBLY" dnl -DOPTIMIZED_FLAGS"
      CFLAGS="$CFLAGS -Wa,-Av8"
      CXXFLAGS="$CXXFLAGS -Wa,-Av8"
      ;;
    SPARC_V9)
      ASM_OPTIMIZATIONS="SPARC V9 architecture"
      DEFINES="$DEFINES -DSPARC_V9_ASSEMBLY" dnl -DOPTIMIZED_FLAGS"
      CFLAGS="$CFLAGS -Wa,-Av9"
      CXXFLAGS="$CXXFLAGS -Wa,-Av9"
      ;;
    esac
    ;;
  esac
elif [[ "x$WANT_NATIVE_M68K" = "xyes" ]]; then
  dnl Native m68k, no emulation
  CPUINCLUDES="-I../native_cpu"
  CPUSRCS="asm_support.s"
fi

dnl Select appropriate FPU source.
dnl 1. Optimized X86 assembly core if target is i386 architecture
SAVED_DEFINES=$DEFINES
if [[ "x$FPE_CORE" = "xdefault" ]]; then
  if [[ "x$HAVE_GCC27" = "xyes" -a "x$HAVE_I386" = "xyes" -a "x$HAVE_GAS" = "xyes" ]]; then
    DEFINES="$DEFINES -DFPU_X86"
    FPE_CORE_STR="i386 optimized core"
    FPUSRCS="../uae_cpu/fpu/fpu_x86.cpp"
  else
    FPE_CORE="uae"
  fi
fi

dnl 2. JIT-FPU only supports IEEE-based implementation.
if [[ "x$WANT_JIT_FPU" = "xyes" -a "x$FPE_CORE" != "xieee" ]]; then
  AC_MSG_WARN([Sorry, JIT-FPU supports only the "ieee" FPE implementation])
  FPE_CORE="ieee"
  dnl Restore previous variables. FPE_CORE_STR and FPUSRCS are overwritten
  DEFINES=$SAVED_DEFINES
fi

dnl 3. Choose either IEEE-based implementation or the old UAE core
if [[ "x$FPE_CORE" = "xieee" ]]; then
  AC_CHECK_HEADERS(fenv.h)
  AC_CHECK_FUNCS(feclearexcept fegetexceptflag feraiseexcept fesetexceptflag fetestexcept)
  AC_CHECK_FUNCS(fegetround fesetround)
  DEFINES="$DEFINES -DFPU_IEEE"
  FPE_CORE_STR="ieee-based fpu core"
  FPUSRCS="../uae_cpu/fpu/fpu_ieee.cpp"
elif [[ "x$FPE_CORE" = "xuae" ]]; then
  DEFINES="$DEFINES -DFPU_UAE"
  FPE_CORE_STR="original uae core"
  FPUSRCS="../uae_cpu/fpu/fpu_uae.cpp"
fi

dnl Check for certain math functions
AC_CHECK_FUNCS(atanh)
AC_CHECK_FUNCS(isnan isinf)		dnl C99
AC_CHECK_FUNCS(isnanl isinfl)	dnl IEEE ?

dnl UAE CPU sources for all non-m68k-native architectures.
if [[ "x$WANT_NATIVE_M68K" = "xno" ]]; then
  CPUINCLUDES="-I../uae_cpu"
  CPUSRCS="../uae_cpu/basilisk_glue.cpp ../uae_cpu/memory.cpp ../uae_cpu/newcpu.cpp ../uae_cpu/readcpu.cpp $FPUSRCS cpustbl.cpp cpudefs.cpp $CPUSRCS"
fi

dnl Remove the "-g" option if set for GCC.
if [[ "x$HAVE_GCC27" = "xyes" ]]; then
  dnl gb-- Probably not the cleanest way to take
  CFLAGS=`echo $CFLAGS | sed -e 's/ -g / /;s/^-g / /;s/ -g$/ /;s/^-g$//'`
  CXXFLAGS=`echo $CXXFLAGS | sed -e 's/ -g / /;s/^-g / /;s/ -g$/ /;s/^-g$//'`
fi

dnl Generate Makefile.
AC_SUBST(DEFINES)
AC_SUBST(SYSSRCS)
AC_SUBST(CPUINCLUDES)
AC_SUBST(CPUSRCS)
AC_OUTPUT(Makefile)

dnl Print summary.
echo
echo Basilisk II configuration summary:
echo
echo XFree86 DGA support .............. : $WANT_XF86_DGA
echo XFree86 VidMode support .......... : $WANT_XF86_VIDMODE
echo fbdev DGA support ................ : $WANT_FBDEV_DGA
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 Running m68k code natively ....... : $WANT_NATIVE_M68K
echo Floating-Point emulation core .... : $FPE_CORE_STR
echo Assembly optimizations ........... : $ASM_OPTIMIZATIONS
echo Addressing mode .................. : $ADDRESSING_MODE
echo
echo "Configuration done. Now type \"make\" (or \"gmake\")."