dnl Process this file with autoconf to produce a configure script.

AC_INIT
AC_CONFIG_SRCDIR([VIC.cpp])
AC_PREREQ(2.52d)

dnl Checks for programs.
AC_PROG_CC
AC_PROG_CXX
AC_PROG_CPP
AC_PROG_MAKE_SET

dnl Don't want the default "-O2 -g" that autoconf uses for gcc.
if [[ x"$GXX" = "xyes" ]]; then
  CFLAGS="-O2 -g -fomit-frame-pointer -Wall -Wno-unused -Wno-format"
fi

UNAME_RELEASE=`(uname -r) 2>/dev/null` || UNAME_RELEASE=unknown
UNAME_SYSTEM=`(uname -s) 2>/dev/null` || UNAME_SYSTEM=unknown

HPUX_REV=0
if [[ x$UNAME_SYSTEM = "xHP-UX" ]]; then
  HPUX_REV=`echo $UNAME_RELEASE | sed -e 's/[^.]*.[0B]*//' -e 's/\..*$//'`
fi

AC_AIX
AC_ISC_POSIX

dnl Checks for libraries.
HAVE_BEBOX=no
AC_CHECK_LIB(amiga, OpenLibrary, HAVE_AMIGA_LIB=yes, HAVE_AMIGA_LIB=no)
AC_CHECK_LIB(vga, vga_setmode, HAVE_SVGA_LIB=yes, HAVE_SVGA_LIB=no)
AM_PATH_SDL(1.2.0, HAVE_SDL=yes, HAVE_SDL=no)

AC_PATH_XTRA
AC_CONFIG_HEADER(sysconfig.h)

AC_HEADER_DIRENT
AC_HEADER_STDC
AC_CHECK_HEADERS(unistd.h fcntl.h sys/time.h sys/types.h utime.h string.h strings.h values.h ncurses.h)
AC_CHECK_HEADERS(sys/vfs.h sys/mount.h sys/select.h sys/param.h sys/statfs.h sys/statvfs.h sys/stat.h linux/joystick.h)

AC_CHECK_SIZEOF(char)
AC_CHECK_SIZEOF(short)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(long long)

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_C_INLINE
AC_TYPE_MODE_T
AC_TYPE_OFF_T
AC_TYPE_PID_T
AC_STRUCT_ST_BLOCKS
AC_HEADER_TIME
AC_STRUCT_TM

dnl Checks for library functions.
AC_PROG_GCC_TRADITIONAL
AC_FUNC_MEMCMP
AC_TYPE_SIGNAL
AC_FUNC_UTIME_NULL
AC_CHECK_FUNCS(gettimeofday sigaction mkdir rmdir select strerror strstr statfs usleep)

KBD_LANG=0
AC_ARG_ENABLE(kbd-lang-de,[  --enable-kbd-lang-de    Use german keyboard layout],[KBD_LANG=1],[])
AC_ARG_ENABLE(kbd-lang-us,[  --enable-kbd-lang-us    Use american keyboard layout],[KBD_LANG=0],[])

AC_MSG_CHECKING(which target to use)
if [[ x"$HAVE_BEBOX" = "xyes" ]]; then
  AC_MSG_RESULT([BeBox])
  TARGET=be
elif [[ x"$HAVE_AMIGA_LIB" = "xyes" ]]; then
  AC_MSG_RESULT([AmigaOS])
  TARGET=amigaos
elif [[ x"$no_x" = "xyes" ]]; then
  if [[ x"$HAVE_SVGA_LIB" = "xyes" ]]; then
    AC_MSG_RESULT([SVGAlib])
    TARGET=svgalib
    CFLAGS="$CFLAGS -D__svgalib__"
    LIBS="$LIBS -lvga"
  else
    AC_MSG_RESULT([Ummm...])
    AC_MSG_ERROR([Neither X nor SVGAlib found, don't know what target to use.])
  fi
elif [[ x"$HAVE_SDL" = "xyes" ]]; then
  AC_MSG_RESULT([SDL])
  TARGET=sdl
  CFLAGS="$CFLAGS $SDL_CFLAGS -DHAVE_SDL"
  LIBS="$LIBS $SDL_LIBS"
else
  AC_MSG_RESULT([X Window System])
  TARGET=x11
  CFLAGS="$CFLAGS $X_CFLAGS -I$ac_cv_x_include"
  LIBS="$LIBS $X_LIBS $X_PRE_LIBS -lXext -lX11 $X_EXTRA_LIBS"
fi

dnl Find out some things about the system 
dnl  - whether we have GCC 2.7 or better.
dnl  - what CPU we have (to use some assembly hacks on the x86)

HAVEGCC27=n
HAVEI386=n

cat >conftest.cpp << EOF
#include <stdio.h>
int main()
{
#if defined(__GNUC__) && defined(__GNUC_MINOR__)
#if __GNUC__ > 2 || __GNUC_MINOR__ > 6
printf("GNU\n");
#endif
#endif
return 0;
}
EOF

$CXX conftest.cpp -c -o conftest.o
$CXX conftest.o -o conftest
./conftest >conftest.file
if grep GNU conftest.file >/dev/null; then
  HAVEGCC27=y
  echo "Good news. Found GCC 2.7 or better."
elif [[ "$CC" = "gcc" ]]; then
  echo "I suggest you upgrade to at least version 2.7 of GCC"
else
  echo "Couldn't find GCC. Frodo may or may not compile and run correctly."
fi

cat >conftest.c << EOF
#include <stdio.h>
int main()
{
#ifdef __i386__
printf("386\n");
#endif
return 0;
}
EOF

$CC conftest.c -c -o conftest.o
$CC conftest.o -o conftest
./conftest >conftest.file
if grep 386 conftest.file >/dev/null; then
  HAVEI386=y
  echo "You seem to be using a x86 CPU"
else
  echo "No special hacks for your CPU, sorry."
fi

rm -f conftest*

if [[ "$HAVEGCC27" = "y" -a "$HAVEI386" = "y" ]]; then
# Don't want strength-reduce on the i386, makes the code slower usually.
  CFLAGS="$CFLAGS -fno-strength-reduce -DREGPARAM=\"__attribute__((regparm(3)))\""
elif [[ "$TARGET" = "amigaos" ]]; then
  CFLAGS="$CFLAGS -DREGPARAM=\"__attribute__((regargs(4)))\" "
else
  CFLAGS="$CFLAGS -DREGPARAM="
fi

CC=$CXX
 
AC_SUBST(TARGET)
AC_SUBST(SET_MAKE)
AC_SUBST(top_srcdir)
AC_SUBST(HPUX_REV)
AC_SUBST(KBD_LANG)

dnl Generate Makefile.
AC_CONFIG_FILES([Makefile])
AC_OUTPUT

dnl Print summary.
echo
echo "Configuration done. Now type \"make\"."