AC_INIT(cpu.c)

CFLAGS="$CFLAGS"

AC_PROG_CC
AC_PROG_CPP
AC_PROG_INSTALL


test "$cross_compiling" = "yes" || AC_C_BIGENDIAN
test "$ac_cv_c_bigendian" = "no" && ENDIAN="-DIS_LITTLE_ENDIAN"



AC_CHECK_FUNCS(usleep, ,[
AC_CHECK_FUNCS(select, ,[
AC_MSG_ERROR(your system must support either usleep or select)
])])




LIBS="$LIBS -L/usr/local/lib -L/usr/X11R6/lib"





AC_ARG_WITH(fb,      [  --with-fb               build framebuffer device interface], [], [with_fb=yes])
AC_ARG_WITH(svgalib, [  --with-svgalib          build Linux svgalib interface], [], [with_svgalib=yes])
AC_ARG_WITH(sdl,     [  --with-sdl              build SDL interface], [], [with_sdl=yes])





SOUND=""
JOY=""

case `uname -s` in
Linux)
SYS_DEFS=-DIS_LINUX
AC_CHECK_HEADERS(sys/soundcard.h, [SOUND=sys/oss/oss.o])
AC_CHECK_HEADERS(linux/joystick.h, [JOY=sys/linux/joy.o])
test "$with_fb" = "no" || AC_CHECK_HEADERS(linux/fb.h, [with_fb=linux])
;;
FreeBSD)
SYS_DEFS=-DIS_FBSD
AC_CHECK_HEADERS(machine/soundcard.h, [SOUND=sys/oss/oss.o])
;;
OpenBSD)
SYS_DEFS=-DIS_OBSD
AC_CHECK_HEADERS(soundcard.h, [SOUND=sys/oss/oss.o])
;;
esac

test "$SOUND" || SOUND=sys/dummy/nosound.o
test "$JOY" || JOY=sys/dummy/nojoy.o






case "$with_fb" in
linux) FB_OBJS="sys/linux/fbdev.o sys/linux/kb.o sys/pc/keymap.o" ;;
*) FB_OBJS="" ; with_fb=no ;;
esac

if test "$with_svgalib" != "no" ; then
AC_CHECK_LIB(vga, vga_init, [
AC_CHECK_HEADERS(vga.h vgakeyboard.h, ,[
AC_MSG_WARN(svgalib found but headers are missing!!)
with_svgalib=no
])], [with_svgalib=no])
fi

if test "$with_sdl" != "no" ; then
AC_CHECK_PROG(SDL_CONFIG, sdl-config, yes)
if test "$SDL_CONFIG" ; then
SDL_LIBS="`sdl-config --libs`"
SDL_CFLAGS="`sdl-config --cflags`"
old_incs="$INCS"
INCS="$INCS $SDL_CFLAGS"
AC_CHECK_LIB(SDL, SDL_Init, [
AC_CHECK_HEADERS(SDL/SDL.h, ,[
AC_MSG_WARN(SDL found but headers are missing!!)
with_sdl=no
])], [with_sdl=no], $SDL_LIBS)
INCS="$old_incs"
else
with_sdl=no
fi
fi

AC_PATH_X

if test "$no_x" != "yes" ; then
with_x=yes
AC_CHECK_LIB(Xext, XShmCreateImage)
AC_CHECK_HEADERS(sys/ipc.h sys/shm.h X11/extensions/XShm.h)
test "$x_includes" && XINCS="-I$x_includes"
test "$x_libraries" && XLIBS="-L$x_libraries"
else
with_x=no
fi



test "$with_x" = "no" || TARGETS="$TARGETS xgnuboy"
test "$with_fb" = "no" || TARGETS="$TARGETS fbgnuboy"
test "$with_svgalib" = "no" || TARGETS="$TARGETS sgnuboy"
test "$with_sdl" = "no" || TARGETS="$TARGETS sdlgnuboy"










AC_ARG_ENABLE(warnings, [  --enable-warnings       enable selected compiler warnings], [], [enable_warnings=yes])
AC_ARG_ENABLE(debug,    [  --enable-debug          include debugging symbols], [])
AC_ARG_ENABLE(profile,  [  --enable-profile        enable performance profiling], [])
AC_ARG_ENABLE(arch,     [  --enable-arch           compile for specific host cpu architecture], [], [enable_arch=yes])
AC_ARG_ENABLE(optimize, [  --enable-optimize=LEVEL select optimization level (full,low,none)], [], [enable_optimize=yes])
AC_ARG_ENABLE(asm,      [  --enable-asm            use hand-optimized asm cores], [], [enable_asm=yes])


if test "$enable_warnings" = yes ; then
case "$CC" in *gcc*)
AC_MSG_RESULT(enabling selected compiler warnings)
CFLAGS="$CFLAGS -ansi -pedantic -Wall" ;;
*)
AC_MSG_RESULT(disabling warnings for non-gcc compiler) ;;
esac
fi

if test "$enable_debug" = yes ; then
AC_MSG_RESULT(including debugging symbols)
CFLAGS="$CFLAGS -g"
fi

if test "$enable_profile" = yes ; then
AC_MSG_RESULT(enabling performance profiling)
CFLAGS="$CFLAGS -pg"
fi

if test "$enable_arch" = yes ; then
if test `uname -s` = Linux -a -f /proc/cpuinfo ; then
case `grep "model name" /proc/cpuinfo` in
*AMD-K6*) enable_arch=k6 ;;
*Pentium*Pro*|*Pentium\ I*|*Klamath*) enable_arch=i686 ;;
*Pentium*|*586*) enable_arch=i586 ;;
*486*) enable_arch=i486 ;;
*386*) enable_arch=i386 ;;
*) enable_arch=no ;;
esac
else
enable_arch=no
#case `uname -m` in
#i686) enable_arch=i686 ;;
#i586) enable_arch=i586 ;;
#i486) enable_arch=i486 ;;
#i386) enable_arch=i386 ;;
#*) enable_arch=no ;;
#esac
fi
fi


case `$CC --version` in

2.9*|3.*)

case "$enable_arch" in
k6|i686|i586|i486|i386) CFLAGS="$CFLAGS -march=$enable_arch" ;;
no) ;;
*) AC_MSG_WARN(unknown architecture $enable_arch) ;;
esac ;;

*)

case "$enable_arch" in
k6|i686|i586) AC_MSG_WARN(your compiler is too old to support $enable_arch optimizations) ;;
i486) CFLAGS="$CFLAGS -m486" ;;
i386) CFLAGS="$CFLAGS -m386" ;;
no) ;;
*) AC_MSG_WARN(unknown architecture $enable_arch) ;;
esac ;;

esac


case "$enable_optimize" in
yes|full)
AC_MSG_RESULT(producing heavily optimized code)

CFLAGS="$CFLAGS -O3"

case `uname -m` in
i?86) CFLAGS="$CFLAGS -DALLOW_UNALIGNED_IO" ;;
esac

#case `$CC --version` in
#2.9*|3.*)
CFLAGS="$CFLAGS -fstrength-reduce -fthread-jumps \
 -fcse-follow-jumps -fcse-skip-blocks -frerun-cse-after-loop \
 -fexpensive-optimizations -fforce-addr"
#;;
#*)
#AC_MSG_WARN(your compiler is too old for fancy optimizations)
#;;
#esac

if test "$enable_debug" != yes -a "$enable_profile" != yes ; then
CFLAGS="$CFLAGS -fomit-frame-pointer"
LDFLAGS="$LDFLAGS -s"
fi ;;

low)

AC_MSG_RESULT(using minimal optimizations)
CFLAGS="$CFLAGS -O3" ;;

esac

if test "$enable_asm" = yes ; then
case `uname -m` in
i?86)
AC_MSG_RESULT(using optimized i386 cores)
ASM="-DUSE_ASM -I./asm/i386" ; ASM_OBJS="asm/i386/cpu.o asm/i386/lcd.o asm/i386/refresh.s" ;;
*)
AC_MSG_RESULT(no optimized asm core available for `uname -m`) ;;
esac
fi


AC_SUBST(SYS_DEFS)
AC_SUBST(ENDIAN)
AC_SUBST(SOUND)
AC_SUBST(JOY)
AC_SUBST(ASM)
AC_SUBST(ASM_OBJS)
AC_SUBST(FB_OBJS)
AC_SUBST(SDL_CFLAGS)
AC_SUBST(SDL_LIBS)
AC_SUBST(TARGETS)
AC_SUBST(XINCS)
AC_SUBST(XLIBS)

AC_CONFIG_HEADER(sys/nix/config.h)
AC_OUTPUT(Makefile)