dnl Process this file with autoget.sh to produce a working configure
dnl script.
dnl
dnl $Id$

AC_INIT
AC_CONFIG_SRCDIR([simgear/bucket/newbucket.cxx])

dnl Require at least automake 2.52
AC_PREREQ(2.52)

dnl Initialize the automake stuff
AM_INIT_AUTOMAKE(SimGear, 0.3.1)

dnl Specify KAI C++ compiler and flags.
dnl Borrowed with slight modification from blitz distribution.
AC_ARG_WITH(cxx,
  [  --with-cxx=COMPILER[:name-flags] set options for COMPILER (KCC)],
  [case "$withval" in
    KCC*)    # KAI C++ http://www.kai.com/
      echo "Configuring for KAI C++"
      AC_SG_SET_COMPILER($withval,"KCC","--restrict --strict_warnings")
      CXX_OPTIMIZE_FLAGS=="+K3 -O3"
      CXX_DEBUG_FLAGS="-g +K0"
    ;;
  esac
])

echo CXX = $CXX
echo CC = $CC

dnl Checks for programs.
AC_PROG_MAKE_SET
AC_PROG_CC
AC_PROG_CPP
AC_PROG_CXX
AC_PROG_RANLIB
AC_PROG_INSTALL
AC_PROG_LN_S

dnl set the $host variable based on local machine/os
AC_CANONICAL_HOST

dnl Used on the Irix platform
AR="ar"
ARFLAGS="cru"
case "${host}" in
*-*-irix*)
    if test "$CXX" = "CC"; then
        AR="CC -ar"
        ARFLAGS="-o"
        CXXFLAGS="$CXXFLAGS -I$(top_srcdir)/simgear/compatibility"
    fi
    ;;
esac
AC_SUBST(AR)
AC_SUBST(ARFLAGS)

if echo $includedir | egrep "simgear$" > /dev/null; then
    echo "includedir is" $includedir "libdir is" $libdir
else
    includedir="${includedir}/simgear"
    echo "includedir changed to" $includedir "libdir is" $libdir
fi
         
dnl set logging; default value of with_logging=yes
AC_ARG_WITH(logging, [  --with-logging          Include logging output (default)])
if test "x$with_logging" = "xno" ; then
    AC_DEFINE([FG_NDEBUG], 1, [Define for no logging output])
fi

# Specify if we want to build with Norman's jpeg image server support.
# This requires libjpeg to be installed and available.
# Default to with_jpeg_server=no
JPEGLIB=''
AC_ARG_WITH(jpeg_factory, [  --with-jpeg-factory     Include Norman's jpeg image factory support code])
if test "x$with_jpeg_factory" = "xyes" ; then
    echo "Building with Norman's jpeg image factory support"
    AC_CHECK_LIB(jpeg, jpeg_start_compress)
    if test "x$ac_cv_lib_jpeg_jpeg_start_compress" != "xyes" ; then
        echo
        echo "In order to build the jpeg factory code you need libjpeg installed."
        echo "otherwise please configure with the --with-jpeg-sever=no option"
        echo
        echo "libjpeg is available at :"
        echo "  ftp://ftp.uu.net in the directory graphics/jpeg"
        exit 1
    fi
else
    echo "Building without Norman's jpeg image server support"
fi
AM_CONDITIONAL(ENABLE_JPEG_SERVER, test "x$with_jpeg_factory" = "xyes")


dnl Determine an extra directories to add to include/lib search paths
case "${host}" in
*-apple-darwin* | *-*-mingw32*)
    echo no EXTRA_DIRS for $host
    ;;

*)
    if test -d /usr/X11R6 ; then
        EXTRA_DIR1="/usr/X11R6"
    fi
    if test -d /opt/X11R6 ; then
        EXTRA_DIR2="/opt/X11R6"
    fi
    EXTRA_DIRS="$EXTRA_DIR1 $EXTRA_DIR2"
    ;;

esac
wi_EXTRA_DIRS(no, ${EXTRA_DIRS})


dnl Using AM_CONDITIONAL is a step out of the protected little 
dnl automake fold so it is potentially dangerous.  But, we are
dnl beginning to run into cases where the standard checks are not
dnl enough.  AM_CONDITIONALS are then referenced to conditionally
dnl build a Makefile.in from a Makefile.am which lets us define custom
dnl includes, compile alternative source files, etc.

dnl X11 might be installed on Mac OS X or cygwin/mingwin, we don't want
dnl to use it if it is.
case "${host}" in
*-apple-darwin* | *-*-cygwin* | *-*-mingw32*)
    echo no fancy X11 check
    ;;

*)
    AC_PATH_XTRA
    ;;

esac

dnl Checks for libraries.

null_LIBS="$LIBS"

AC_CHECK_LIB(m, cos)

base_LIBS="$LIBS"

dnl Thread related checks
AC_CHECK_LIB(pthread, pthread_exit)
AC_CHECK_HEADER(pthread.h)
if test "x$ac_cv_lib_pthread_pthread_exit" = "xyes" -a "x$ac_cv_header_pthread_h" = "xyes"; then
    CXXFLAGS="$CXXFLAGS -D_REENTRANT"
    CFLAGS="$CFLAGS -D_REENTRANT"
fi
if test "x$ac_cv_lib_pthread_pthread_exit" != "xyes" -a "x$ac_cv_header_pthread_h" = "xyes"; then
    dnl FreeBSD: System has pthread.h, but -lpthread library check
    dnl fails.  See if we need -pthread instead of -lpthread and look
    dnl for the functions in libc_r.
    save_CXXFLAGS="$CXXFLAGS"
    save_CFLAGS="$FLAGS"
    CXXFLAGS="-pthread $CXXFLAGS"
    CFLAGS="-pthread $FLAGS"
    save_LIBS=$LIBS
    AC_CHECK_LIB(c_r, pthread_exit)
    if test "x$ac_cv_lib_c_r_pthread_exit" != "xyes"; then
	CXXFLAGS=$save_CXXFLAGS
	CFLAGS=$save_CFLAGS
    else
	dnl This is cheating a bit. pthread_exit comes with using -pthread, not -lpthread
	ac_cv_lib_pthread_pthread_exit="yes"
    fi
    LIBS=$save_LIBS
fi
AM_CONDITIONAL(HAVE_THREADS, test "x$ac_cv_lib_pthread_pthread_exit" = "xyes" -a "x$ac_cv_header_pthread_h" = "xyes")

AC_CHECK_LIB(socket, socket)

dnl check for glut location
AC_CHECK_HEADER(GL/glut.h)
if test "x$ac_cv_header_GL_glut_h" = "xyes"; then
    AC_DEFINE([GLUT_H], "GL/glut.h", [Define as glut.h include location])
else
    AC_CHECK_HEADER(GLUT/glut.h)
    if test "x$ac_cv_header_GLUT_glut_h" = "xyes"; then
        AC_DEFINE([GLUT_H], "GLUT/glut.h", [Define as glut.h include location])
    else
        echo "Neither GL/glut.h nor GLUT/glut.h found.  Cannot continue"
        exit
    fi
fi

dnl check for OpenGL related libraries
case "${host}" in
*-*-cygwin* | *-*-mingw32*)
    dnl CygWin under Windoze.

    echo Win32 specific hacks...
    AC_DEFINE([WIN32], 1, [Define for Win32 platforms])
    AC_DEFINE([NOMINMAX], 1, [Define for Win32 platforms])

    LIBS="$LIBS -lglut32 -lglu32 -lopengl32"
    LIBS="$LIBS -luser32 -lgdi32 -lwinmm"

    dnl add -lwsock32 for mingwin
    case "${host}" in
    *-*-mingw32*)
        base_LIBS="$base_LIBS -lws2_32"
        ;;
    esac

    echo "Will link apps with $LIBS"
    ;;

*-apple-darwin*)
    dnl Mac OS X

    LIBS="$LIBS -framework GLUT -framework OpenGL -framework Carbon -lobjc"
    ;;

*)
    dnl X-Windows based machines

    AC_CHECK_LIB(X11, XCreateWindow)
    AC_CHECK_LIB(Xext, XShmCreateImage)
    AC_CHECK_LIB(Xi, XGetExtensionVersion)
    AC_CHECK_LIB(ICE, IceOpenConnection)
    AC_CHECK_LIB(SM, SmcOpenConnection)
    AC_CHECK_LIB(Xt, XtMalloc)
    AC_CHECK_LIB(Xmu, XmuLookupStandardColormap)
    
    AC_CHECK_LIB(GLcore, glNewList)
    if test "x$ac_cv_lib_GLcore_glNewList" = "xno" ; then
	dnl if no GLcore, check for GL
	AC_CHECK_LIB(GL, glNewList)
	if test "x$ac_cv_lib_GL_glNewList" = "xno" ; then
	    dnl if no GL, check for MesaGL
	    AC_CHECK_LIB(MesaGL, glNewList)
	fi
    else
	dnl if GLcore found, then also check for GL
	AC_CHECK_LIB(GL, glXCreateContext)
    fi

    dnl if using mesa, check for xmesa.h
    if test "x$ac_cv_lib_MesaGL_glNewList" = "xyes" ; then
	AC_CHECK_HEADER(GL/fxmesa.h)
	if test "x$ac_cv_header_GL_fxmesa_h" = "xyes"; then
	    AC_DEFINE([XMESA], 1, [Define for fxmesa])
            AC_DEFINE([FX], 1, [Define for fxmesa])
        fi
    fi

    AC_CHECK_LIB(GLU, gluLookAt)
    if test "x$ac_cv_lib_GLU_gluLookAt" = "xno" ; then
	dnl if no GLU, check for MesaGLU
	AC_CHECK_LIB(MesaGLU, gluLookAt)
    fi

    LIBS="$LIBS -lglut"
    ;;

esac

opengl_LIBS="$LIBS"
LIBS="$base_LIBS"

AC_SUBST(base_LIBS)
AC_SUBST(opengl_LIBS)

dnl Check for MS Windows environment
AC_CHECK_HEADER(windows.h)
AM_CONDITIONAL(EXTGL_NEEDED, test "x$ac_cv_header_windows_h" = "xyes")

# The following are C++ items that need to be tested for with the c++
# compiler

AC_LANG_PUSH(C++)

dnl Check for "plib" without which we cannot go on
AC_CHECK_HEADER(plib/ul.h)
if test "x$ac_cv_header_plib_ul_h" != "xyes"; then
    echo
    echo "You *must* have the plib library installed on your system to build"
    echo "SimGear!"
    echo
    echo "Please see README.plib for more details."
    echo
    echo "configure aborted."
    exit
fi

AC_MSG_CHECKING([for plib 1.6.0 or newer])
AC_TRY_RUN([
#include <plib/ul.h>

#define MIN_PLIB_VERSION 160

int main() {
    int major, minor, micro;

    if ( PLIB_VERSION < MIN_PLIB_VERSION ) {
	 return -1;
    }

    return 0;
}

],
  AC_MSG_RESULT(yes),
  [AC_MSG_RESULT(wrong version);
   AC_MSG_ERROR([Install plib 1.6.0 or later first...])],
  AC_MSG_RESULT(yes)
)

dnl Check for MetaKit
AC_CHECK_HEADER(mk4.h)
if test "x$ac_cv_header_mk4_h" != "xyes"; then
    echo
    echo "MetaKit library not found."
    echo
    echo "If your OS does not provide an installable package for MetaKit"
    echo "you will have to compile and install it first yourself.  A copy"
    echo "of metakit-$(VERSION).tar.gz is included with SimGear.  You will"
    echo "have to untar this source code, and follow its included instructions"
    echo "to compile and install on your system."
    echo
    echo "configure aborted."
    exit
fi

AC_MSG_CHECKING([for metakit 2.4.3 or newer])
saved_LIBS="$LIBS"
LIBS="$saved_LIBS -lmk4"
AC_TRY_RUN([
#include <mk4.h>

#define MIN_MK4_VERSION 243

int main() {
    int major, minor, micro;

    if ( d4_MetaKitLibraryVersion < MIN_MK4_VERSION ) {
	 return -1;
    }

    return 0;
}

],
  AC_MSG_RESULT(yes),
  [AC_MSG_RESULT(wrong version);
   AC_MSG_ERROR([

Install metakit 2.4.3 or later first.

Or, the compiler may not be finding your libmk4.so library.
Please check the config.log file for specific details of the
failure if you believe you have the correct metakit version.
Also, look up this issue in the FlightGear FAQ.])],
  AC_MSG_RESULT(yes)
)

LIBS="$saved_LIBS"

AC_LANG_POP

dnl Check for system installed zlib
AC_CHECK_HEADER(zlib.h)
if test "x$ac_cv_header_zlib_h" != "xyes"; then
    echo
    echo "zlib library not found."
    echo
    echo "If your OS does not provide an installable package for zlib"
    echo "you will have to compile and install it first yourself.  A copy"
    echo "of zlib-1.1.4.tar.gz is included with SimGear.  You will"
    echo "have to untar this source code, and follow its included instructions"
    echo "to compile and install on your system."
    echo
    echo "configure aborted."
    echo
fi

dnl Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS( \
	fcntl.h getopt.h malloc.h memory.h stdint.h stdlib.h sys/param.h \
	sys/stat.h sys/time.h sys/timeb.h unistd.h winbase.h values.h )

if test "x$ac_cv_header_stdint_h" = "xyes"; then
    AC_DEFINE([HAVE_STDINT_H], 1, [Define if stdint.h exists])
fi

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_SIZE_T
AC_HEADER_TIME
AC_STRUCT_TM

dnl Checks for library functions.
AC_TYPE_SIGNAL
AC_FUNC_VPRINTF
AC_CHECK_FUNCS( \
        ftime gettimeofday timegm memcpy bcopy mktime strstr rand \
	random drand48 setitimer getitimer signal GetLocalTime rint getrusage )

AM_CONFIG_HEADER(simgear/simgear_config.h)

AC_CONFIG_FILES([ \
	Makefile \
	SimGear.spec \
	src-libs/Makefile \
	simgear/Makefile \
	simgear/version.h \
	simgear/compatibility/Makefile \
	simgear/bucket/Makefile \
	simgear/debug/Makefile \
	simgear/ephemeris/Makefile \
	simgear/io/Makefile \
	simgear/magvar/Makefile \
	simgear/math/Makefile \
	simgear/metar/Makefile \
	simgear/misc/Makefile \
	simgear/route/Makefile \
	simgear/screen/Makefile \
	simgear/serial/Makefile \
	simgear/sky/Makefile \
	simgear/sky/clouds3d/Makefile \
	simgear/threads/Makefile \
	simgear/timing/Makefile \
	simgear/xgl/Makefile \
	simgear/xml/Makefile \
])
AC_OUTPUT


echo ""
echo "Configure Summary"
echo "================="

echo "Prefix: $prefix"

if test "x$with_logging" != "x"; then
    echo "Debug messages: $with_logging"
else
    echo "Debug messages: yes"
fi

echo -n "Automake version: "
automake --version | head -1

if test "x$ac_cv_header_GL_glut_h" = "xyes"; then
   echo "With GL/glut.h"
fi
if test "x$ac_cv_header_GLUT_glut_h" = "xyes"; then
   echo "With GLUT/glut.h"
fi

if test "x$with_jpeg_factory" = "xyes"; then
   echo "With JPEG Factory support"
else
   echo "Without JPEG Factory support"
fi

if test "x$ac_cv_lib_pthread_pthread_exit" = "xyes" -a "x$ac_cv_header_pthread_h" = "xyes"; then
   echo "Threads: pthread lib found."
else
   echo "Threads: no threads (pthread lib not found.)"
fi