#!/bin/sh
# The purpose of this script is to check for all external tools, headers, and
# libraries VBox OSE depends on.

#
# Copyright (C) 2006-2007 innotek GmbH
#
# This file is part of VirtualBox Open Source Edition (OSE), as
# available from http://www.virtualbox.org. This file is free software;
# you can redistribute it and/or modify it under the terms of the GNU
# General Public License as published by the Free Software Foundation,
# in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
# distribution. VirtualBox OSE is distributed in the hope that it will
# be useful, but WITHOUT ANY WARRANTY of any kind.
#
# If you received this file as part of a commercial VirtualBox
# distribution, then only the terms of your commercial VirtualBox
# license agreement apply instead of the previous paragraph.
#

LC_ALL=C
export LC_ALL

#
# Defaults
#
OSE=1
TARGET_MACHINE=""
TARGET_CPU=""
WITH_XPCOM=1
WITH_LIBIDL=1
WITH_QT=1
WITH_SDL_TTF=1
CC="gcc"
CC32=""
CC64=""
CXX="g++"
CXX32=""
CXX64=""
BCC="bcc"
YASM="yasm"
IASL="iasl"
AS86="as86"
XSLTPROC="xsltproc"
GENISOIMAGE="genisoimage"
MKISOFS="mkisofs"
INCXALAN=""
LIBXALAN="-lxalan-c"
INCXERCES=""
LIBXERCES="-lxerces-c"
LIBCRYPTO="-lcrypto"
LIBPTHREAD="-lpthread"
LIBX11="-L/usr/X11R6/lib -L/usr/X11R6/lib64 -lXext -lX11"
LIBXCURSOR="-lXcursor"
INCZ=""
LIBZ="-lz"
INCPNG=""
LIBPNG="-lpng"
QTDIR="/usr/qt/3 /usr/lib/qt3 /usr/lib/qt-3.3 /usr/share/qt3 /usr/lib64/qt-3.3 /usr/X11R6"
KBUILDDIR="`cd $(dirname $0); pwd`/kBuild"
DEVDIR="`cd $(dirname $0); pwd`/tools"
if [ -d "/lib/modules/`uname -r`/build" ]; then
 LINUX="/lib/modules/`uname -r`/build"
else
 LINUX="/usr/src/linux"
fi
KCHMVIEWER="kchmviewer"
LOG="configure.log"
CNF="AutoConfig.kmk"
ENV="env.sh"
BUILD_TYPE="release"
# the restricting tool is ar (mri mode).
INVALID_CHARS="[^A-Za-z0-9/\\$:._-]"

if (cd `dirname $0`; pwd)|grep -q "$INVALID_CHARS"; then
  echo "Error: VBox base path contains invalid characters!"
  exit 1
fi

cleanup()
{
  rm -f .tmp_src.cc .tmp_src.c .tmp_out .test_execute.log
}

fail()
{
  if [ -z "$nofatal" -o "x$1" != "x" ]; then
    cleanup
    rm -f $ENV
    exit 1
  fi
}

log_success()
{
  if [ -n "$1" ]; then echo -n "$1, "; fi
  echo "OK."
  echo "$1" >> $LOG
  echo >> $LOG
  echo >> $LOG
}

log_failure()
{
  echo
  echo "  ** $1!"
  echo "** $1!" >> $LOG
  echo >> $LOG
}

cnf_append()
{
  printf "%-30s := %s\n" "$1" "$2" >> $CNF
}

strip_l()
{
  echo "$1"|sed 's|-l\([^ ]\+\)|\1|g; s|-[^l]\([^ ]\+\)||g; s|^ ||; s| *$||g'
}

strip_L()
{
  echo "$1"|sed 's|-L\([^ ]\+\)|\1|g; s|-[^L]\([^ ]\+\)||g; s|^ ||; s| *$||g'
}

strip_I()
{
  echo "$1"|sed 's|-I\([^ ]\+\)|\1|g; s|-[^I]\([^ ]\+\)||g; s|^ ||; s| *$||g'
}

# Wrapper for ancient /usr/bin/which on darwin that always returns 0
which_wrapper()
{
  if [ -z "$have_ancient_which" ]; then
    if which /bin/___cErTaINly_a_nOn_eXisTing_fIle___ 2> /dev/null > /dev/null; then
      have_ancient_which="yes"
    else
      have_ancient_which="no"
    fi
  fi
  if [ "$have_ancient_which" = "yes" ]; then
    local retval=`which $* 2>/dev/null`
    echo "$retval"
    test -n "$retval" -a -e "$retval"
  else
    which $* 2> /dev/null
  fi
}

check_avail()
{
   if [ -z "$1" ]; then
     log_failure "$2 is empty"
     fail $3
     return 1
   elif which_wrapper $1 > /dev/null; then
     return 0
   else
     log_failure "$1 (variable $2) not found"
     fail $3
     return 1
   fi
}

# Prepare a test
test_header()
{
  echo "***** Checking $1 *****" >> $LOG
  echo -n "Checking for $1: "
}

# Compile a test
test_compile()
{
  echo "compiling the following source file:" >> $LOG
  cat .tmp_src.cc >> $LOG
  echo "using the following command line:" >> $LOG
  echo "$CXX -O -Wall -o .tmp_out .tmp_src.cc \"$1\"" >> $LOG
  $CXX -O -Wall -o .tmp_out .tmp_src.cc $1 >> $LOG 2>&1
  if [ $? -ne 0 ]; then
    if [ -z "$4" ]; then
      echo
      echo "  $2 not found at $1 or $3 headers not found"
      echo "  Check the file $LOG for detailed error information."
      fail
    else
      echo "not found."
      echo >> $LOG
      echo >> $LOG
    fi
    return 1
  fi
  return 0
}

# Execute a compiled test binary
test_execute()
{
  echo "executing the binary" >> $LOG
  ./.tmp_out > .test_execute.log
  rc=$?
  cat .test_execute.log | tee -a $LOG
  if [ $rc -ne 0 ]; then
    fail $1
    return 1
  fi
  echo >> $LOG
  echo >> $LOG
  return 0
}

#
# Check for OS, MACHINE, CPU
#
check_environment()
{
  test_header environment
  BUILD_CPU=`uname -m`
  case "$BUILD_CPU" in
    i[3456789]86|x86)
      BUILD_MACHINE='x86'
      LIB='lib'
      ;;
    x86_64|amd64)
      BUILD_MACHINE='amd64'
      BUILD_CPU='k8'
      # on AMD64 systems, 64bit libs are usually located in /usr/lib64
      # see http://www.pathname.com/fhs/pub/fhs-2.3.html#LIB64
      LIB='lib64'
      ;;
    *)
      log_failure "Cannot determine system"
      exit 1
      ;;
  esac
  [ -z "$TARGET_MACHINE" ] && TARGET_MACHINE=$BUILD_MACHINE
  [ -z "$TARGET_CPU"     ] && TARGET_CPU=$BUILD_CPU
  OS=`uname -s | sed -e 's/GNU\/Linux/Linux/g' | tr 'A-Z' 'a-z'`
  case "$OS" in
    linux)
      ;;
    darwin)
      ;;
    freebsd)
      ;;
    *)
      log_failure "Cannot determine OS"
      exit 1
      ;;
  esac
  DEVDIR_BIN="$DEVDIR/$OS.$BUILD_MACHINE/bin"
  KBUILDDIR_BIN="$KBUILDDIR/bin/$OS.$BUILD_MACHINE"
  log_success "Determined build machine: $OS.$BUILD_MACHINE, target machine: $OS.$TARGET_MACHINE"

  # Automatically disable XPCOM on darwin.
  if [ "$OS" = "darwin" -a $WITH_XPCOM -eq 1 ]; then
    WITH_XPCOM=0
    WITH_LIBIDL=0
    WITH_QT=0
    echo "Disabling checks for XPCOM related components."
  fi
}

#
# Check for gcc with version >= 3.2.
# We depend on a working gcc, if we fail terminate in every case.
#
check_gcc()
{
  test_header gcc
  if check_avail "$CC" CC really; then
    cc_ver=`$CC -dumpversion`
    if check_avail "$CXX" CXX really; then
      cxx_ver=`$CXX -dumpversion`
      cc_maj=`echo $cc_ver|cut -d. -f1`
      cc_min=`echo $cc_ver|cut -d. -f2`
      if [ "x$cc_ver" != "x$cxx_ver" ]; then
        log_failure "gcc version $cc_ver does not match g++ version $cxx_ver"
        fail really
      elif [ $cc_maj -eq 4 -a $cc_min -eq 0 ]; then
        log_failure "gcc version $cc_ver found, expected gcc 3.x with x>1 or gcc 4.x with x>0"
        fail really
      elif [ $cc_maj -gt 3 ]; then
        log_success "found version $cc_ver"
      elif [ $cc_maj -lt 3 -o $cc_min -lt 2 ]; then
        log_failure "gcc version $cc_ver found, expected gcc 3.x with x>1 or gcc 4.x with x>0"
        fail really
      else
        log_success "found version $cc_ver"
      fi
      if [ "$BUILD_MACHINE" = "amd64" ]; then
        [ -z "$CC32"  ] && CC32="$CC -m32"
        [ -z "$CXX32" ] && CXX32="$CXX -m32"
      else
        [ -z "$CC32"  ] && CC32="$CC"
        [ -z "$CXX32" ] && CXX32="$CXX"
      fi
      if [ "$BUILD_MACHINE" = "x86" -a "$TARGET_MACHINE" = "amd64" ]; then
	[ -z "$CC64"  ] && CC64="$CC -m64"
	[ -z "$CXX64" ] && CXX64="$CXX -m64"
      fi
      if [ "$CC" != "gcc" ]; then
        cnf_append "TOOL_GCC3_CC"   "$CC"
        cnf_append "TOOL_GCC3_AS"   "$CC"
        cnf_append "TOOL_GCC3_LD"   "$CC"
        cnf_append "TOOL_GXX3_CC"   "$CC"
        cnf_append "TOOL_GXX3_AS"   "$CC"
      fi
      if [ "$CXX" != "g++" ]; then
        cnf_append "TOOL_GCC3_CXX"  "$CXX"
        cnf_append "TOOL_GXX3_CXX"  "$CXX"
        cnf_append "TOOL_GXX3_LD"   "$CXX"
      fi
      if [ "$CC32" != "gcc -m32" ]; then
        cnf_append "TOOL_GCC32_CC"  "$CC32"
        cnf_append "TOOL_GCC32_AS"  "$CC32"
        cnf_append "TOOL_GCC32_LD"  "$CC32"
        cnf_append "TOOL_GXX32_CC"  "$CC32"
        cnf_append "TOOL_GXX32_AS"  "$CC32"
      fi
      if [ "$CXX32" != "g++ -m32" ]; then
        cnf_append "TOOL_GCC32_CXX" "$CXX32"
        cnf_append "TOOL_GXX32_CXX" "$CXX32"
        cnf_append "TOOL_GXX32_LD"  "$CXX32"
      fi
      if [ -n "$CC64" ]; then
        cnf_append "TOOL_GCC64_CC"  "$CC64"
        cnf_append "TOOL_GCC64_AS"  "$CC64"
        cnf_append "TOOL_GCC64_LD"  "$CC64"
        cnf_append "TOOL_GXX64_CC"  "$CC64"
        cnf_append "TOOL_GXX64_AS"  "$CC64"
      fi
      if [ -n "$CXX64" ]; then
        cnf_append "TOOL_GCC64_CXX" "$CXX64"
        cnf_append "TOOL_GXX64_CXX" "$CXX64"
        cnf_append "TOOL_GXX64_LD"  "$CXX64"
      fi
    fi
  fi
}

#
# Check for the bcc compiler, needed for compiling the BIOS
#
check_bcc()
{
  test_header bcc
  if check_avail "$BCC" BCC; then
    bcc_ver=`$BCC -v 2>&1|grep version|sed 's+^bcc: version \(.*\)+\1+'`
    if [ $? -ne 0 ]; then
      log_failure "not found"
      fail
    else
      echo "compiling the following source file:" >> $LOG
      cat > .tmp_src.c << EOF
int foo(a)
  int a;
{
  return 0;
}
EOF
      cat .tmp_src.c >> $LOG
      local bcc_path=`which_wrapper $BCC`
      local bcc_dir="`dirname $bcc_path`/"
      echo "using the following command line:" >> $LOG
      echo "$BCC -B $bcc_dir -C-c -3 -S -o .tmp_out .tmp_src.c" >> $LOG
      $BCC -B $bcc_dir -C-c -3 -S -o .tmp_out .tmp_src.c >> $LOG 2>&1
      if [ $? -ne 0 ]; then
        log_failure "not found"
        fail
      else
        log_success "found version $bcc_ver"
        cnf_append "VBOX_BCC" "$bcc_path -B $bcc_dir"
      fi
    fi
  fi
}

#
# Check for the as86 assembler, needed for compiling the BIOS
#
check_as86()
{
  test_header as86
  if check_avail "$AS86" AS86; then
    as86_ver=`$AS86 -v 2>&1|grep version|sed 's+^as86 version: \(.*\)+\1+'`
    if [ $? -ne 0 ]; then
      log_failure "not found"
      fail
    else
      log_success "found version $as86_ver"
      cnf_append "VBOX_AS86" "`which_wrapper $AS86`"
    fi
  fi
}

#
# Check for yasm, needed to compile assembler files
#
check_yasm()
{
  test_header yasm
  if check_avail "$YASM" YASM; then
    yasm_ver=`$YASM --version|grep "^yasm"|sed 's+^yasm \(.*\)+\1+'`
    if [ $? -ne 0 ]; then
      log_failure "not found"
      fail
    else
      yasm_maj=`echo $yasm_ver|cut -d. -f1`
      yasm_min=`echo $yasm_ver|cut -d. -f2`
      yasm_rev=`echo $yasm_ver|cut -d. -f3`
      yasm_ver_mul=$(($yasm_maj*10000+$yasm_min*100+$yasm_rev))
      if [ $yasm_ver_mul -lt 501 ]; then
        log_failure "found version $yasm_ver, expected at least 0.5.1"
        fail
      else
        log_success "found version $yasm_ver"
      fi
    fi
  fi
}

#
# Check for the iasl ACPI compiler, needed to compile vbox.dsl
#
check_iasl()
{
  test_header iasl
  if check_avail "$IASL" IASL; then
    iasl_ver=`$IASL|grep version|sed 's+^ASL.*version \([0-9]*\).*+\1+'`
    if [ $? -ne 0 ]; then
      log_failure "not found"
      fail
    else
      log_success "found version $iasl_ver"
      cnf_append "VBOX_IASLCMD" "`which_wrapper $IASL`"
    fi
  fi
}

#
# Check for xsltproc, needed by Main
#
check_xsltproc()
{
  test_header xslt
  if check_avail "$XSLTPROC" XSLTPROC; then
    xsltproc_ver=`$XSLTPROC --version`
    if [ $? -ne 0 ]; then
      log_failure "not found"
      fail
    else
      log_success "found"
      cnf_append "VBOX_XSLTPROC" "`which_wrapper $XSLTPROC`"
    fi
  fi
}

#
# Check for mkisofs, needed to build the CDROM image containing the additions
#
check_mkisofs()
{
  test_header mkisofs
  if which_wrapper $GENISOIMAGE > /dev/null; then
    mkisofs_ver=`$GENISOIMAGE --version`
    if [ $? -ne 0 ]; then
      log_failure "not found"
      fail
    else
      log_success "found $mkisofs_ver"
      cnf_append "VBOX_MKISOFS" "`which_wrapper $GENISOIMAGE`"
    fi
  elif check_avail "$MKISOFS" MKISOFS; then
    mkisofs_ver=`$MKISOFS --version`
    if [ $? -ne 0 ]; then
      log_failure "not found"
      fail
    else
      log_success "found $mkisofs_ver"
      cnf_append "VBOX_MKISOFS" "`which_wrapper $MKISOFS`"
    fi
  fi
}

#
# Check for xalan, needed by VBoxXML
#
check_xalan()
{
  if [ -n "$LIBXALAN" ]; then
    test_header xalan
    cat > .tmp_src.cc << EOF
#include <cstdio>
#include <xalanc/Include/XalanVersion.hpp>
extern "C" int main(void)
{
  printf("found version %d.%d.%d",
         XALAN_VERSION_MAJOR, XALAN_VERSION_MINOR, XALAN_VERSION_REVISION);
#if _XALAN_VERSION >= 10800
  printf(", OK.\n");
  return 0;
#else
  printf(", expected version 1.8.0 or higher\n");
  return 1;
#endif
}
EOF
    if test_compile "$LIBXALAN $LIBPTHREAD ${INCXALAN:+-I$INCXALAN}" xalan xalanc; then
      if test_execute; then
        cnf_append "SDK_VBOX_XALAN_LIBS" "`strip_l "$LIBXALAN"`"
        cnf_append "SDK_VBOX_XALAN_INCS" "$INCXALAN"
      fi
    fi
  else
    echo "Building xalan from shipped sources."
    echo "Building xalan from shipped sources." >> $LOG
    echo >> $LOG
    echo >> $LOG
  fi
}

#
# Check for xerces, needed by VBoxXML
#
check_xerces()
{
  if [ -n "$LIBXERCES" ]; then
    test_header xerces
    cat > .tmp_src.cc << EOF
#include <cstdio>
#include <xercesc/util/XercesVersion.hpp>
extern "C" int main(void)
{
  printf("found version %d.%d.%d",
         XERCES_VERSION_MAJOR, XERCES_VERSION_MINOR, XERCES_VERSION_REVISION);
#if _XERCES_VERSION >= 20500
  printf(", OK.\n");
  return 0;
#else
  printf(", expected version 2.5.0 or higher");
  return 1;
#endif
}
EOF
    if test_compile "$LIBXERCES $LIBPTHREAD ${INCXERCES:+-I$INCXERCES}" xerces xercesc; then
      if test_execute; then
        cnf_append "SDK_VBOX_XERCES_LIBS" "`strip_l "$LIBXERCES"`"
        cnf_append "SDK_VBOX_XERCES_INCS" "$INCXERCES"
      fi
    fi
  else
    echo "Building xerces from shipped sources."
    echo "Building xerces from shipped sources." >> $LOG
    echo >> $LOG
    echo >> $LOG
  fi
}

#
# Check for libIDL, needed by xpcom
#
check_libidl()
{
  test_header libIDL

  if which_wrapper libIDL-config-2 > /dev/null; then
    libidl_ver=`libIDL-config-2 --version`
    if [ $? -ne 0 ]; then
      log_failure "not found"
      fail
    else
      log_success "found version $libidl_ver"
      cnf_append "VBOX_LIBIDL_CONFIG" \
        "PKG_CONFIG_PATH=`libIDL-config-2 --prefix`/$LIB/pkgconfig `which_wrapper libIDL-config-2`"
    fi
  elif check_avail "libIDL-config" libIDL-config; then
    libidl_ver=`libIDL-config --version`
    if [ $? -ne 0 ]; then
      log_failure "not found"
      fail
    else
      log_success "found version $libidl_ver"
      cnf_append "VBOX_LIBIDL_CONFIG" "`which_wrapper libIDL-config`"
    fi
  fi
}

#
# Check for openssl, needed for RDP
#
check_ssl()
{
  test_header ssl
  cat > .tmp_src.cc << EOF
#include <cstdio>
#include <openssl/opensslv.h>
extern "C" int main(void)
{
  printf("found version %s", OPENSSL_VERSION_TEXT);
#if OPENSSL_VERSION_NUMBER >= 0x0090700
  printf(", OK.\n");
  return 0;
#else
  printf(", expected version 0.9.7 or higher\n");
  return 1;
#endif
}
EOF
  if test_compile $LIBCRYPTO libcrypto openssl; then
    if test_execute nofatal; then
      cnf_append "SDK_VBOX_OPENSSL_INCS" ""
      cnf_append "SDK_VBOX_OPENSSL_LIBS" "`strip_l "$LIBCRYPTO"`"
    fi
  fi
}

#
# Check for pthread, needed by VBoxSVC, frontends, ...
#
check_pthread()
{
  test_header pthread
  cat > .tmp_src.cc << EOF
#include <cstdio>
#include <pthread.h>
extern "C" int main(void)
{
  pthread_mutex_t mutex;
  if (pthread_mutex_init(&mutex, NULL)) {
    printf("pthread_mutex_init() failed\n");
    return 1;
  }
  if (pthread_mutex_lock(&mutex)) {
    printf("pthread_mutex_lock() failed\n");
    return 1;
  }
  if (pthread_mutex_unlock(&mutex)) {
    printf("pthread_mutex_unlock() failed\n");
    return 1;
  }
  printf("found, OK.\n");
}
EOF
  if test_compile $LIBPTHREAD pthread pthread; then
    if test_execute; then
      cnf_append "LIB_PTHREAD" "`strip_l "$LIBPTHREAD"`"
    fi
  fi
}

#
# Check for zlib, needed by VBoxSVC, Runtime, ...
#
check_z()
{
  test_header zlib
  cat > .tmp_src.cc << EOF
#include <cstdio>
#include <zlib.h>
extern "C" int main(void)
{
  printf("found version %s", ZLIB_VERSION);
#if ZLIB_VERNUM >= 0x1210
  printf(", OK.\n");
  return 0;
#else
  printf(", expected version 1.2.1 or higher\n");
  return 1;
#endif
}
EOF
  if test_compile "$LIBZ ${INCZ:+-I$INCZ}" zlib zlib; then
    if test_execute; then
      cnf_append "SDK_VBOX_ZLIB_LIBS" "`strip_l "$LIBZ"`"
      cnf_append "SDK_VBOX_ZLIB_INCS" "$INCZ"
    fi
  fi
}

#
# Check for libpng, needed by kchmviewer
#
check_png()
{
  test_header libpng
  cat > .tmp_src.cc << EOF
#include <cstdio>
#include <png.h>
extern "C" int main(void)
{
  printf("found version %s", PNG_LIBPNG_VER_STRING);
#if PNG_LIBPNG_VER >= 10205
  printf(", OK.\n");
  return 0;
#else
  printf(", expected version 1.2.5 or higher\n");
  return 1;
#endif
}
EOF
#  if test_compile "$LIBPNG ${INCPNG:+-I$INCPNG}" libpng libpng nofatal; then
  if test_compile "$LIBPNG ${INCPNG:+-I$INCPNG}" libpng libpng; then
#    if test_execute nofatal; then
    if test_execute; then
      cnf_append "SDK_VBOX_LIBPNG_LIBS" "`strip_l "$LIBPNG"`"
      cnf_append "SDK_VBOX_LIBPNG_INCS" "$INCPNG"
    fi
  fi
}

#
# Check for pam, needed by VRDPAuth
# Version 79 was introduced in 9/2005, do we support older versions?
# Debian/sarge uses 76
# OpenSUSE comes with 0.99.xxx where they changed the versioning scheme.
#
check_pam()
{
  test_header pam
  cat > .tmp_src.cc << EOF
#include <cstdio>
#include <security/pam_appl.h>
extern "C" int main(void)
{
  printf("found version %d", __LIBPAM_VERSION);
  if (__LIBPAM_VERSION >= 76)
  {
    printf(", OK.\n");
    return 0;
  }
  else
  {
    printf(", expected version 76 or higher\n");
    return 1;
  }
}
EOF
  if test_compile "-lpam" pam pam nofatal; then
    if test_execute nofatal; then
      return 0;
    fi
  fi
  test_header linux_pam
  cat > .tmp_src.cc << EOF
#include <cstdio>
#include <security/pam_appl.h>
extern "C" int main(void)
{
  printf("found version %d.%d", __LINUX_PAM__, __LINUX_PAM_MINOR__);
  if (__LINUX_PAM__ >= 1)
  {
    printf(", OK.\n");
    return 0;
  }
  else
  {
    printf(", expected version 1.0 or higher\n");
    return 1;
  }
}
EOF
  if test_compile "-lpam" pam pam; then
    test_execute
  fi
}


#
# Check for the SDL library, needed by VBoxSDL and VirtualBox
# We depend at least on version 1.2.7
#
check_sdl()
{
  test_header SDL
  if which_wrapper sdl-config > /dev/null; then
    FLGSDL=`sdl-config --cflags`
    INCSDL=`strip_I "$FLGSDL"`
    LIBSDL=`sdl-config --libs`
    LIBSDLMAIN="-lSDLmain"
    cat > .tmp_src.cc << EOF
#include <cstdio>
#include <SDL/SDL.h>
#include <SDL/SDL_main.h>
extern "C" int main(void)
{
  printf("found version %d.%d.%d",
         SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_PATCHLEVEL);
#if SDL_VERSION_ATLEAST(1,2,7)
  printf(", OK.\n");
  return 0;
#else
  printf(", expected version 1.2.7 or higher\n");
  return 1;
#endif
}
EOF
    if test_compile "$LIBSDL $LIBSDLMAIN ${INCSDL:+-I$INCSDL}" SDL SDL; then
      if test_execute; then
        cnf_append "LIB_SDK_LIBSDL_SDL"     "`strip_l "$LIBSDL"`"
        cnf_append "SDK_LIBSDL_LIBPATH"     "`strip_L "$LIBSDL"`"
        cnf_append "LIB_SDK_LIBSDL_SDLMAIN" "`strip_l "$LIBSDLMAIN"`"
        [ -n "$INCSDL" ] && cnf_append "SDK_LIBSDL_INCS" "$INCSDL"
      fi
    fi
  else
    log_failure "not found"
  fi
}

#
# Check for the SDL_ttf library, needed by VBoxSDL (secure label)
#
check_sdl_ttf()
{
  test_header SDL_ttf
  cat > .tmp_src.cc << EOF
#include <cstdio>
#include <SDL/SDL_ttf.h>
#ifndef SDL_TTF_MAJOR_VERSION
#define SDL_TTF_MAJOR_VERSION TTF_MAJOR_VERSION
#define SDL_TTF_MINOR_VERSION TTF_MINOR_VERSION
#define SDL_TTF_PATCHLEVEL    TTF_PATCHLEVEL
#endif
extern "C" int main(void)
{
  printf("found version %d.%d.%d",
         SDL_TTF_MAJOR_VERSION, SDL_TTF_MINOR_VERSION, SDL_TTF_PATCHLEVEL);
#if 10000*SDL_TTF_MAJOR_VERSION + 100*SDL_TTF_MINOR_VERSION + SDL_TTF_PATCHLEVEL >= 20006
  printf(", OK.\n");
  return 0;
#else
  printf(", expected version 2.0.6 or higher\n");
  return 1;
#endif
}
EOF
  if test_compile "-lSDL_ttf" SDL_ttf SDL_ttf; then
    test_execute
  fi
}

#
# Check for libasound, needed by the ALSA audio backend
#
check_alsa()
{
  test_header ALSA
  cat > .tmp_src.cc << EOF
#include <alsa/asoundlib.h>
extern "C" int main(void)
{
  printf("found version %d.%d.%d",
         SND_LIB_MAJOR, SND_LIB_MINOR, SND_LIB_SUBMINOR);
#if 10000*SND_LIB_MAJOR + 100*SND_LIB_MINOR + SND_LIB_SUBMINOR >= 10006
  printf(", OK.\n");
  return 0;
#else
  printf(", expected version 1.0.6 or higher\n");
  return 1;
#endif
}
EOF
  if test_compile "-lasound" asound asound; then
    test_execute
  fi
}

#
# Check for the Xcursor library, needed by VBoxSDL and VBoxBFE
#
check_xcursor()
{
  test_header Xcursor
  cat > .tmp_src.cc << EOF
#include <cstdio>
#include <X11/Xlib.h>
#include <X11/Xcursor/Xcursor.h>
extern "C" int main(void)
{
  XcursorImage *cursor = XcursorImageCreate (10, 10);
  XcursorImageDestroy(cursor);
  return 0;
}
EOF
  if test_compile "$LIBX11 $LIBXCURSOR" Xcursor Xcursor; then
    log_success "found"
    cnf_append "LIB_XCURSOR" "`strip_l "$LIBXCURSOR"`"
  fi
}

#
# Check for the X libraries (Xext, X11)
#
check_x()
{
  test_header "X libraries"
  cat > .tmp_src.cc << EOF
#include <cstdio>
#include <X11/Xlib.h>
extern "C" int main(void)
{
  Display *dpy;
  int scrn_num;
  Screen *scrn;
  Window win;

  dpy      = XOpenDisplay(NULL);
  scrn_num = DefaultScreen(dpy);
  scrn     = ScreenOfDisplay(dpy, scrn_num);
  win      = XCreateWindow(dpy, RootWindowOfScreen(scrn), 0, 0, 100, 100,
                           0, 16, InputOutput, CopyFromParent, 0, NULL);
  XDestroyWindow(dpy, win);
}
EOF
  if test_compile "$LIBX11" Xlibs Xlibs; then
    log_success "found"
  fi
}

#
# Check for the QT library, needed by VirtualBox
#
check_qt()
{
  test_header Qt
  cat > .tmp_src.cc << EOF
#include <cstdio>
#include <qglobal.h>
extern "C" int main(void)
{
  printf("found version %s", QT_VERSION_STR);
#if QT_VERSION >= 0x030305
  printf(", OK.\n");
  return 0;
#elif QT_VERSION >= 0x030300
  printf("\n  ** WARNING: QT < 3.3.5 has known problems!\n");
#else
  printf(", expected version 3.3.0 or higher\n");
  return 1;
#endif
}
EOF
  found_qt=0
  libs="lib"
  [ "$LIB" = "lib64" ] && libs="$libs lib64"
  for q in $QTDIR; do
    for l in $libs; do
      echo "compiling the following source file:" >> $LOG
      cat .tmp_src.cc >> $LOG
      echo "using the following command line:" >> $LOG
      echo "$CXX -O -Wall -o .tmp_out .tmp_src.cc -I$q/include -L$q/$l -lqt-mt" >> $LOG
    
      $CXX -O -Wall -o .tmp_out .tmp_src.cc -I$q/include -L$q/$l -lqt-mt >> $LOG 2>&1
      if [ $? -eq 0 ]; then
        if test_execute; then
          cnf_append "QTDIR" "`cd $q ; pwd`"
          found_qt=1
          break
        fi
      fi
    done
    if [ $found_qt -eq 1 ]; then
      break
    fi
  done
  if [ $found_qt -ne 1 ]; then
    echo
    echo "  Qt not found at \"$QTDIR\" or Qt headers not found"
    echo "  Check the file $LOG for detailed error information."
    fail
    return 1
  fi
  test_header "Qt devtools"
  if check_avail "$q/bin/moc" QTDIR/bin; then
    moc_ver=`$q/bin/moc 2>&1 -v|sed 's+^.*(Qt \(.*\))+\1+'`
    if [ $? -ne 0 ]; then
      log_failure "not found"
      fail
    else
      log_success "found version $moc_ver"
    fi
  fi
}

#
# Check for Linux sources
#
check_linux()
{
  test_header "Linux kernel sources"
  cat > .tmp_src.c << EOF
#include <linux/version.h>
int printf(const char *format, ...);
int main(void)
{
  printf("found version %d.%d.%d",  LINUX_VERSION_CODE / 65536,
                                   (LINUX_VERSION_CODE % 65536) / 256,
                                    LINUX_VERSION_CODE          % 256);
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,4,0)
  printf(", OK.\n");
  return 0;
#else
  printf(", expected version 2.4.0 or higher\n");
  return 1;
#endif
}
EOF
  echo "compiling the following source file:" >> $LOG
  cat .tmp_src.c >> $LOG
  echo "using the following command line:" >> $LOG
  echo "$CC -O -Wall -o .tmp_out .tmp_src.c -nostdinc -I$LINUX/include" >> $LOG
  $CC -O -Wall -o .tmp_out .tmp_src.c -nostdinc -I$LINUX/include >> $LOG 2>&1
  if [ $? -ne 0 ]; then
    echo
    echo "  Linux kernel headers not found at $LINUX"
    echo "  Check the file $LOG for detailed error information."
    fail
  else
    if test_execute; then
      cnf_append "VBOX_LINUX_SRC" "`cd $LINUX ; pwd`"
    fi
  fi
}

#
# Check for kchmviewer, needed to display the online help
#
check_kchmviewer()
{
  test_header kchmviewer
  if check_avail "$KCHMVIEWER" KCHMVIEWER; then
    kchmviewer_ver=`$KCHMVIEWER --version|grep "^KchmViewer:"|sed 's+^KchmViewer: \(.*\)+\1+'`
    if [ $? -ne 0 ]; then
      log_failure "not found"
      fail
    else
      log_success "found version $kchmviewer_ver"
    fi
  fi
}

#
# Check for the kBuild tools, we don't support GNU make
#
check_kbuild()
{
  test_header kBuild
  if check_avail "$KBUILDDIR_BIN/kmk" KBUILDDIR really; then
    log_success "found"
    echo "export BUILD_PLATFORM=\"$OS\"" >> $ENV
    echo "export BUILD_PLATFORM_ARCH=\"$BUILD_MACHINE\"" >> $ENV
    echo "export BUILD_TARGET=\"$OS\"" >> $ENV
    echo "export BUILD_TARGET_ARCH=\"$TARGET_MACHINE\"" >> $ENV
    echo "export BUILD_TARGET_CPU=\"$TARGET_CPU\"" >> $ENV
    echo "export BUILD_TYPE=\"$BUILD_TYPE\"" >> $ENV
    echo "export PATH_KBUILD=\"`cd $KBUILDDIR ; pwd`\"" >> $ENV
    echo "export PATH_DEVTOOLS=\"$DEVDIR\"" >> $ENV
    echo "path_kbuild_bin=\"\$PATH_KBUILD/bin/\$BUILD_TARGET.\$BUILD_PLATFORM_ARCH\"" >> $ENV
    echo "export PATH_KBUILD_BIN=\"\$path_kbuild_bin\"" >> $ENV
    echo "path_dev_bin=\"\$PATH_DEVTOOLS/\$BUILD_TARGET.\$BUILD_PLATFORM_ARCH\"/bin" >> $ENV
    echo "echo \"\$PATH\" | grep -q \"\$path_kbuild_bin\" || PATH=\"\$path_kbuild_bin:\$PATH\"" >> $ENV
    echo "echo \"\$PATH\" | grep -q \"\$path_dev_bin\" || PATH=\"\$path_dev_bin:\$PATH\"" >> $ENV
    echo "export PATH" >> $ENV
    echo "unset path_kbuild_bin path_dev_bin" >> $ENV
  fi
}


#
# Check for compiler.h
# Some Linux distributions include "compiler.h" in their libc linux 
# headers package, some don't.  Most don't need it, building might (!) 
# not succeed on openSUSE without it.
#
# See http://www.mail-archive.com/qemu-devel%40nongnu.org/msg07980.html
#
check_compiler_h()
{
  test_header compiler.h
  if ! test -f "/usr/include/linux/compiler.h"; then
    cnf_append "VBOX_WITHOUT_LINUX_COMPILER_H" "1"
    log_success "compiler.h not found"
  else
    log_success "compiler.h found"
  fi
}


#
# Show help
#
show_help()
{
  cat << EOF
Usage: ./configure [OPTIONS]...

Configuration:
  -h, --help              display this help and exit
  --nofatal               don't abort on errors
  --disable-xpcom         disable XPCOM and related stuff
  --disable-sdl-ttf       disable SDL_ttf detection
  --build-xalan           build xalan & xerces from shipped sources

Paths:
  --with-gcc=PATH         location of the gcc compiler [$CC]
  --with-g++=PATH         location of the g++ compiler [$CXX]
  --with-kbuild=DIR       kbuild directory [$KBUILDDIR]
  --with-iasl=PATH        location of the iasl compiler [$IASL]
  --with-linux=DIR        Linux kernel source directory [$LINUX]
  --with-mkisofs=PATH     location of mkisofs [$MKISOFS]
  --with-qt-dir=DIR       directory for QT headers/libraries [$QTDIR]
  --with-xalan=LIB        location of the xalan library [$LIBXALAN]
  --with-xerces=LIB       location of the xerces library [$LIBXERCES]

Build type:
  -d, --build-debug       build with debugging symbols and assertions
  --build-headless        build headless (without any X11 frontend)
EOF
  exit 0
}


#
# The body.
#

# scan command line options
for option; do
  case "$option" in
    --help|-help|-h)
      show_help
      ;;
    --nofatal)
      nofatal=1
      ;;
    --with-gcc=*)
      CC=`echo $option | cut -d'=' -f2`
      ;;
    --with-g++=*)
      CXX=`echo $option | cut -d'=' -f2`
      ;;
    --with-kbuild=*)
      KBUILDDIR=`echo $option | cut -d'=' -f2`
      if echo $KBUILDDIR|grep -q "$INVALID_CHARS"; then
        echo "Error: KBUILDDIR contains invalid characters!"
        exit 1
      fi
      ;;
    --with-qt-dir=*)
      QTDIR=`echo $option | cut -d'=' -f2`
      ;;
    --with-iasl=*)
      IASL=`echo $option | cut -d'=' -f2`
      ;;
    --with-linux=*)
      LINUX=`echo $option | cut -d'=' -f2`
      ;;
    --with-mkisofs=*)
      MKISOFS=`echo $option | cut -d'=' -f2`
      ;;
    --with-xalan=*)
      LIBXALAN=`echo $option | cut -d'=' -f2`
      ;;
    --with-xerces=*)
      LIBXERCES=`echo $option | cut -d'=' -f2`
      ;;
    --disable-xpcom)
      WITH_XPCOM=0
      ;;
    --disable-sdl-ttf)
      WITH_SDL_TTF=0
      ;;
    --disable-qt)
      WITH_QT=0
      ;;
    --build-debug|-d)
      BUILD_TYPE=debug
      ;;
    --build-xalan)
      LIBXERCES=``
      LIBXALAN=``
      ;;
    --build-headless)
      HEADLESS=1
      ;;
    --ose)
      OSE=2
      ;;
    --odir=*)
      ODIR=`echo $option | cut -d'=' -f2`
      ;;
    *)
      echo
      echo "Unrecognized option \"$option\""
      echo
      show_help
      ;;
  esac
done

LOG="${ODIR:+$ODIR/}$LOG"
ENV="${ODIR:+$ODIR/}$ENV"
CNF="${ODIR:+$ODIR/}$CNF"

# initialize output files
cat > $LOG << EOF
# Log file generated by
#
#   '$0 $*'
#

EOF
cat > $CNF << EOF
# -*- Makefile -*-
#
# automatically generated by
#
#   '$0 $*'
#
# It will be completely overwritten if configure is executed again.
#

EOF
cat > $ENV << EOF
#!/bin/bash
#
# automatically generated by
#
#   '$0 $*'
#
# It will be completely overwritten if configure is executed again.
# Make sure you source this file once before you start to build VBox.
#

EOF

# test if we are OSE
if [ $OSE -eq 1 -a -d "`cd $(dirname $0); pwd`/src/VBox/Devices/USB" ]; then
  echo "Found USB devices, assuming VBOX_OSE = FALSE" >> $LOG
  echo >> $LOG
  OSE=0
fi

if [ "$BUILD_TYPE" = "debug" ]; then
  echo "Creating DEBUG build!" >> $LOG
fi

# first determine our environment
check_environment
check_kbuild

# some things are not available in for OSE
if [ $OSE -ge 1 ]; then
  cnf_append "VBOX_OSE" "1"
  cnf_append "VBOX_WITH_TESTSUITE" ""
  cnf_append "VBOX_WITH_WIN32_ADDITIONS" ""

  if [ "$OS" = "linux" ]; then
    cnf_append "VBOX_WITH_LINUX_ADDITIONS" "1"
  else
    cnf_append "VBOX_WITH_LINUX_ADDITIONS" ""
  fi
  echo >> $CNF
fi

# headless
if [ -n "$HEADLESS" ]; then
  cnf_append "VBOX_HEADLESS" "1"
fi

# emit disable directives corresponding to any --disable-xxx options.
[ $WITH_XPCOM -eq 0 ]   && cnf_append "VBOX_WITH_MAIN" ""
[ $WITH_QT -eq 0 ]      && cnf_append "VBOX_WITH_QTGUI" ""
[ $WITH_SDL_TTF -eq 0 ] && cnf_append "VBOX_WITH_SECURELABEL" ""

# append the tools directory to the default search path
echo "$PATH" | grep -q "$DEVDIR_BIN" || PATH="$PATH:$DEVDIR_BIN"

# append some extra paths
PATH="$PATH:/opt/gnome/bin"

# the tools
check_gcc
[ "$OS" != "darwin"  ] && check_as86
[ "$OS" != "darwin"  ] && check_bcc
[ "$OS" != "darwin"  ] && check_iasl
# don't check for yasm for the time beeing as 0.40 and 0.50 both have known bugs
# [ "$OS" != "darwin" ] && check_yasm
[ "$OS" != "darwin"  ] && check_xsltproc
[ $OSE -eq 0 ]         && check_mkisofs

# the libraries
[ "$OS" != "darwin"  ] && check_pthread
[ $WITH_XPCOM  -eq 1 ] && check_xalan
[ $WITH_XPCOM  -eq 1 ] && check_xerces
[ $WITH_LIBIDL -eq 1 ] && check_libidl
[ $OSE -eq 0 ]         && check_ssl
[ "$OS" != "darwin"  ] && check_z
[ $OSE -eq 0 ]         && check_png
[ $OSE -eq 0 -a "$OS" = "linux" ] && check_pam
[ "$OS" != "darwin"  ] && check_sdl
[ $WITH_SDL_TTF -eq 1 -a $OSE -eq 0 ] && check_sdl_ttf
[ "$OS" != "darwin"  ] && check_x
[ "$OS" != "darwin"  ] && check_xcursor
[ $WITH_QT -eq 1     ] && check_qt

# Linux-specific
if [ "$OS" = "linux" ]; then
  check_linux
  check_alsa
  check_compiler_h
fi

# success!
echo
echo "Successfully generated '$CNF' and '$ENV'."
echo "Source '$ENV' once before you start to build VBox:"
echo ""
echo "  source $ENV"
echo "  kmk"
echo ""
if [ "$OS" = "linux" ]; then
    echo "To compile the kernel module, do:"
    echo ""
    echo "  cd ./out/$OS.$TARGET_MACHINE/$BUILD_TYPE/bin/src"
    echo "  make"
    echo ""
fi
echo "Enjoy!"
cleanup