#
# The build process allows for using a cross-compiler.  But the default
# action is to target the same platform that we are running on.  The
# configure script needs to discover the following properties of the 
# build and target systems:
#
#    srcdir
#
#        The is the name of the directory that contains the
#        "configure" shell script.  All source files are
#        located relative to this directory.
#
#    bindir
#
#        The name of the directory where executables should be
#        written by the "install" target of the makefile.
#
#    program_prefix
#
#        Add this prefix to the names of all executables that run
#        on the target machine.  Default: ""
#
#    ENABLE_SHARED
#
#        True if shared libraries should be generated.
#
#    BUILD_CC
#
#        The name of a command that is used to convert C
#        source files into executables that run on the build
#        platform.
#
#    BUILD_CFLAGS
#
#        Switches that the build compiler needs in order to construct
#        command-line programs.
#
#    BUILD_LIBS
#
#        Libraries that the build compiler needs in order to construct
#        command-line programs.
#
#    BUILD_EXEEXT
#
#        The filename extension for executables on the build
#        platform.  "" for Unix and ".exe" for Windows.
#
#    TCL_*
#
#        Lots of values are read in from the tclConfig.sh script,
#        if that script is available.  This values are used for
#        constructing and installing the TCL extension.
#
#    TARGET_READLINE_LIBS
#
#        This is the library directives passed to the target linker
#        that cause the executable to link against the readline library.
#        This might be a switch like "-lreadline" or pathnames of library
#        file like "../../src/libreadline.a".
#
#    TARGET_READLINE_INC
#
#        This variables define the directory that contain header
#        files for the readline library.  If the compiler is able 
#        to find <readline.h> on its own, then this can be blank.
#
#    TARGET_EXEEXT
#
#        The filename extension for executables on the
#        target platform.  "" for Unix and ".exe" for windows.
#
# This configure.in file is easy to reuse on other projects.  Just
# change the argument to AC_INIT().  And disable any features that
# you don't need (for example BLT) by erasing or commenting out
# the corresponding code.
#
AC_INIT(sqlite, m4_esyscmd([cat VERSION | tr -d '\n']))

dnl Make sure the local VERSION file matches this configure script
sqlite_version_sanity_check=`cat $srcdir/VERSION | tr -d '\n'`
if test "$PACKAGE_VERSION" != "$sqlite_version_sanity_check" ; then
AC_MSG_ERROR([configure script is out of date:
 configure \$PACKAGE_VERSION = $PACKAGE_VERSION
 top level VERSION file     = $sqlite_version_sanity_check
please regen with autoconf])
fi

#########
# Programs needed
#
AC_PROG_LIBTOOL
AC_PROG_INSTALL

#########
# Enable large file support (if special flags are necessary)
#
AC_SYS_LARGEFILE

#########
# Check for needed/wanted data types
AC_CHECK_TYPES([int8_t, int16_t, int32_t, int64_t, intptr_t, uint8_t,
                uint16_t, uint32_t, uint64_t, uintptr_t])

#########
# Check for needed/wanted headers
AC_CHECK_HEADERS([sys/types.h stdlib.h stdint.h inttypes.h malloc.h])

#########
# Figure out whether or not we have these functions
#
AC_CHECK_FUNCS([fdatasync gmtime_r isnan localtime_r localtime_s malloc_usable_size strchrnul usleep utime pread pread64 pwrite pwrite64])

#########
# By default, we use the amalgamation (this may be changed below...)
#
USE_AMALGAMATION=1

#########
# See whether we can run specific tclsh versions known to work well;
# if not, then we fall back to plain tclsh.
# TODO: try other versions before falling back?
# 
AC_CHECK_PROGS(TCLSH_CMD, [tclsh8.7 tclsh8.6 tclsh8.5 tclsh], none)
if test "$TCLSH_CMD" = "none"; then
  # If we can't find a local tclsh, then building the amalgamation will fail.
  # We act as though --disable-amalgamation has been used.
  echo "Warning: can't find tclsh - defaulting to non-amalgamation build."
  USE_AMALGAMATION=0
  TCLSH_CMD="tclsh"
fi
AC_SUBST(TCLSH_CMD)

AC_ARG_VAR([TCLLIBDIR], [Where to install tcl plugin])
if test "x${TCLLIBDIR+set}" != "xset" ; then
  TCLLIBDIR='$(libdir)'
  for i in `echo 'puts stdout $auto_path' | ${TCLSH_CMD}` ; do
    TCLLIBDIR=$i
    break
  done
  TCLLIBDIR="${TCLLIBDIR}/sqlite3"
fi


#########
# Set up an appropriate program prefix
#
if test "$program_prefix" = "NONE"; then
  program_prefix=""
fi
AC_SUBST(program_prefix)

VERSION=[`cat $srcdir/VERSION | sed 's/^\([0-9]*\.*[0-9]*\).*/\1/'`]
AC_MSG_NOTICE(Version set to $VERSION)
AC_SUBST(VERSION)
RELEASE=`cat $srcdir/VERSION`
AC_MSG_NOTICE(Release set to $RELEASE)
AC_SUBST(RELEASE)
VERSION_NUMBER=[`cat $srcdir/VERSION \
                           | sed 's/[^0-9]/ /g' \
                | awk '{printf "%d%03d%03d",$1,$2,$3}'`]
AC_MSG_NOTICE(Version number set to $VERSION_NUMBER)
AC_SUBST(VERSION_NUMBER)

#########
# Locate a compiler for the build machine.  This compiler should
# generate command-line programs that run on the build machine.
#
if test x"$cross_compiling" = xno; then
	BUILD_CC=$CC
	BUILD_CFLAGS=$CFLAGS
else
	if test "${BUILD_CC+set}" != set; then
		AC_CHECK_PROGS(BUILD_CC, gcc cc cl)
	fi
	if test "${BUILD_CFLAGS+set}" != set; then
		BUILD_CFLAGS="-g"
	fi
fi
AC_SUBST(BUILD_CC)

##########
# Do we want to support multithreaded use of sqlite
#
AC_ARG_ENABLE(threadsafe, 
AC_HELP_STRING([--disable-threadsafe],[Disable mutexing]),,enable_threadsafe=yes)
AC_MSG_CHECKING([whether to support threadsafe operation])
if test "$enable_threadsafe" = "no"; then
  SQLITE_THREADSAFE=0
  AC_MSG_RESULT([no])
else
  SQLITE_THREADSAFE=1
  AC_MSG_RESULT([yes])
fi
AC_SUBST(SQLITE_THREADSAFE)

if test "$SQLITE_THREADSAFE" = "1"; then
  AC_SEARCH_LIBS(pthread_create, pthread)
  AC_SEARCH_LIBS(pthread_mutexattr_init, pthread)
fi

##########
# Do we want to support release
#
AC_ARG_ENABLE(releasemode, 
AC_HELP_STRING([--enable-releasemode],[Support libtool link to release mode]),,enable_releasemode=no)
AC_MSG_CHECKING([whether to support shared library linked as release mode or not])
if test "$enable_releasemode" = "no"; then
  ALLOWRELEASE=""
  AC_MSG_RESULT([no])
else
  ALLOWRELEASE="-release `cat $srcdir/VERSION`"
  AC_MSG_RESULT([yes])
fi
AC_SUBST(ALLOWRELEASE)

##########
# Do we want temporary databases in memory
#
AC_ARG_ENABLE(tempstore, 
AC_HELP_STRING([--enable-tempstore],[Use an in-ram database for temporary tables (never,no,yes,always)]),,enable_tempstore=no)
AC_MSG_CHECKING([whether to use an in-ram database for temporary tables])
case "$enable_tempstore" in
  never ) 
    TEMP_STORE=0
    AC_MSG_RESULT([never])
  ;;
  no ) 
    TEMP_STORE=1
    AC_MSG_RESULT([no])
  ;;
  yes ) 
     TEMP_STORE=2
    AC_MSG_RESULT([yes])
  ;;
  always ) 
     TEMP_STORE=3
    AC_MSG_RESULT([always])
  ;;
  * ) 
    TEMP_STORE=1
    AC_MSG_RESULT([no])
  ;;
esac

AC_SUBST(TEMP_STORE)

###########
# Lots of things are different if we are compiling for Windows using
# the CYGWIN environment.  So check for that special case and handle
# things accordingly.
#
AC_MSG_CHECKING([if executables have the .exe suffix])
if test "$config_BUILD_EXEEXT" = ".exe"; then
  CYGWIN=yes
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(unknown)
fi
if test "$CYGWIN" != "yes"; then
  AC_CYGWIN
fi
if test "$CYGWIN" = "yes"; then
  BUILD_EXEEXT=.exe
else
  BUILD_EXEEXT=$EXEEXT
fi
if test x"$cross_compiling" = xno; then
  TARGET_EXEEXT=$BUILD_EXEEXT
else
  TARGET_EXEEXT=$config_TARGET_EXEEXT
fi
if test "$TARGET_EXEEXT" = ".exe"; then
  SQLITE_OS_UNIX=0
  SQLITE_OS_WIN=1
  CFLAGS="$CFLAGS -DSQLITE_OS_WIN=1"
else
  SQLITE_OS_UNIX=1
  SQLITE_OS_WIN=0
  CFLAGS="$CFLAGS -DSQLITE_OS_UNIX=1"
fi

AC_SUBST(BUILD_EXEEXT)
AC_SUBST(SQLITE_OS_UNIX)
AC_SUBST(SQLITE_OS_WIN)
AC_SUBST(TARGET_EXEEXT)

##########
# Figure out all the parameters needed to compile against Tcl.
#
# This code is derived from the SC_PATH_TCLCONFIG and SC_LOAD_TCLCONFIG
# macros in the in the tcl.m4 file of the standard TCL distribution.
# Those macros could not be used directly since we have to make some
# minor changes to accomodate systems that do not have TCL installed.
#
AC_ARG_ENABLE(tcl, AC_HELP_STRING([--disable-tcl],[do not build TCL extension]),
      [use_tcl=$enableval],[use_tcl=yes])
if test "${use_tcl}" = "yes" ; then
  AC_ARG_WITH(tcl, AC_HELP_STRING([--with-tcl=DIR],[directory containing tcl configuration (tclConfig.sh)]), with_tclconfig=${withval})
  AC_MSG_CHECKING([for Tcl configuration])
  AC_CACHE_VAL(ac_cv_c_tclconfig,[
    # First check to see if --with-tcl was specified.
    if test x"${with_tclconfig}" != x ; then
      if test -f "${with_tclconfig}/tclConfig.sh" ; then
        ac_cv_c_tclconfig=`(cd ${with_tclconfig}; pwd)`
      else
        AC_MSG_ERROR([${with_tclconfig} directory doesn't contain tclConfig.sh])
      fi
    fi

    # Start autosearch by asking tclsh
    if test x"${ac_cv_c_tclconfig}" = x ; then
      if test x"$cross_compiling" = xno; then
        for i in `echo 'puts stdout $auto_path' | ${TCLSH_CMD}`
        do
          if test -f "$i/tclConfig.sh" ; then
            ac_cv_c_tclconfig="$i"
            break
          fi
        done
      fi
    fi

    # On ubuntu 14.10, $auto_path on tclsh is not quite correct.
    # So try again after applying corrections.
    if test x"${ac_cv_c_tclconfig}" = x ; then
      if test x"$cross_compiling" = xno; then
        for i in `echo 'puts stdout $auto_path' | ${TCLSH_CMD} | sed 's,/tcltk/tcl,/tcl,g'`
        do
          if test -f "$i/tclConfig.sh" ; then
            ac_cv_c_tclconfig="$i"
            break
          fi
        done
      fi
    fi

    # Recent versions of Xcode on Macs hid the tclConfig.sh file
    # in a strange place.
    if test x"${ac_cv_c_tclconfig}" = x ; then
      if test x"$cross_compiling" = xno; then
        for i in /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX*.sdk/usr/lib
        do
          if test -f "$i/tclConfig.sh" ; then
            ac_cv_c_tclconfig="$i"
            break
          fi
        done
      fi
    fi

    # then check for a private Tcl installation
    if test x"${ac_cv_c_tclconfig}" = x ; then
      for i in \
            ../tcl \
            `ls -dr ../tcl[[8-9]].[[0-9]].[[0-9]]* 2>/dev/null` \
            `ls -dr ../tcl[[8-9]].[[0-9]] 2>/dev/null` \
            `ls -dr ../tcl[[8-9]].[[0-9]]* 2>/dev/null` \
            ../../tcl \
            `ls -dr ../../tcl[[8-9]].[[0-9]].[[0-9]]* 2>/dev/null` \
            `ls -dr ../../tcl[[8-9]].[[0-9]] 2>/dev/null` \
            `ls -dr ../../tcl[[8-9]].[[0-9]]* 2>/dev/null` \
            ../../../tcl \
            `ls -dr ../../../tcl[[8-9]].[[0-9]].[[0-9]]* 2>/dev/null` \
            `ls -dr ../../../tcl[[8-9]].[[0-9]] 2>/dev/null` \
            `ls -dr ../../../tcl[[8-9]].[[0-9]]* 2>/dev/null`
      do
        if test -f "$i/unix/tclConfig.sh" ; then
          ac_cv_c_tclconfig=`(cd $i/unix; pwd)`
          break
        fi
      done
    fi

    # check in a few common install locations
    if test x"${ac_cv_c_tclconfig}" = x ; then
      for i in \
            `ls -d ${libdir} 2>/dev/null` \
            `ls -d /usr/local/lib 2>/dev/null` \
            `ls -d /usr/contrib/lib 2>/dev/null` \
            `ls -d /usr/lib 2>/dev/null`
      do
        if test -f "$i/tclConfig.sh" ; then
           ac_cv_c_tclconfig=`(cd $i; pwd)`
           break
        fi
      done
    fi

    # check in a few other private locations
    if test x"${ac_cv_c_tclconfig}" = x ; then
      for i in \
         ${srcdir}/../tcl \
         `ls -dr ${srcdir}/../tcl[[8-9]].[[0-9]].[[0-9]]* 2>/dev/null` \
         `ls -dr ${srcdir}/../tcl[[8-9]].[[0-9]] 2>/dev/null` \
         `ls -dr ${srcdir}/../tcl[[8-9]].[[0-9]]* 2>/dev/null`
      do
        if test -f "$i/unix/tclConfig.sh" ; then
          ac_cv_c_tclconfig=`(cd $i/unix; pwd)`
          break
        fi
      done
    fi
  ])

  if test x"${ac_cv_c_tclconfig}" = x ; then
    use_tcl=no
    AC_MSG_WARN(Can't find Tcl configuration definitions)
    AC_MSG_WARN(*** Without Tcl the regression tests cannot be executed ***)
    AC_MSG_WARN(*** Consider using --with-tcl=... to define location of Tcl ***)
  else
    TCL_BIN_DIR=${ac_cv_c_tclconfig}
    AC_MSG_RESULT(found $TCL_BIN_DIR/tclConfig.sh)

    AC_MSG_CHECKING([for existence of $TCL_BIN_DIR/tclConfig.sh])
    if test -f "$TCL_BIN_DIR/tclConfig.sh" ; then
      AC_MSG_RESULT([loading])
      . $TCL_BIN_DIR/tclConfig.sh
    else
      AC_MSG_RESULT([file not found])
    fi
    
    #
    # If the TCL_BIN_DIR is the build directory (not the install directory),
    # then set the common variable name to the value of the build variables.
    # For example, the variable TCL_LIB_SPEC will be set to the value
    # of TCL_BUILD_LIB_SPEC. An extension should make use of TCL_LIB_SPEC
    # instead of TCL_BUILD_LIB_SPEC since it will work with both an
    # installed and uninstalled version of Tcl.
    #
    
    if test -f $TCL_BIN_DIR/Makefile ; then
      TCL_LIB_SPEC=${TCL_BUILD_LIB_SPEC}
      TCL_STUB_LIB_SPEC=${TCL_BUILD_STUB_LIB_SPEC}
      TCL_STUB_LIB_PATH=${TCL_BUILD_STUB_LIB_PATH}
    fi
    
    #
    # eval is required to do the TCL_DBGX substitution
    #
    
    eval "TCL_LIB_FILE=\"${TCL_LIB_FILE}\""
    eval "TCL_LIB_FLAG=\"${TCL_LIB_FLAG}\""
    eval "TCL_LIB_SPEC=\"${TCL_LIB_SPEC}\""
    
    eval "TCL_STUB_LIB_FILE=\"${TCL_STUB_LIB_FILE}\""
    eval "TCL_STUB_LIB_FLAG=\"${TCL_STUB_LIB_FLAG}\""
    eval "TCL_STUB_LIB_SPEC=\"${TCL_STUB_LIB_SPEC}\""
    
    AC_SUBST(TCL_VERSION)
    AC_SUBST(TCL_BIN_DIR)
    AC_SUBST(TCL_SRC_DIR)
    AC_SUBST(TCL_INCLUDE_SPEC)
    
    AC_SUBST(TCL_LIB_FILE)
    AC_SUBST(TCL_LIB_FLAG)
    AC_SUBST(TCL_LIB_SPEC)
    
    AC_SUBST(TCL_STUB_LIB_FILE)
    AC_SUBST(TCL_STUB_LIB_FLAG)
    AC_SUBST(TCL_STUB_LIB_SPEC)
    AC_SUBST(TCL_SHLIB_SUFFIX)
  fi
fi
if test "${use_tcl}" = "no" ; then
  HAVE_TCL=""
else
  HAVE_TCL=1
fi
AC_SUBST(HAVE_TCL)

##########
# Figure out what C libraries are required to compile programs
# that use "readline()" library.
#
TARGET_READLINE_LIBS=""
TARGET_READLINE_INC=""
TARGET_HAVE_READLINE=0
TARGET_HAVE_EDITLINE=0
AC_ARG_ENABLE([editline],
	[AC_HELP_STRING([--enable-editline],[enable BSD editline support])],
	[with_editline=$enableval],
	[with_editline=auto])
AC_ARG_ENABLE([readline],
	[AC_HELP_STRING([--disable-readline],[disable readline support])],
	[with_readline=$enableval],
	[with_readline=auto])

if test x"$with_editline" != xno; then
        sLIBS=$LIBS
        LIBS=""
	TARGET_HAVE_EDITLINE=1
	AC_SEARCH_LIBS(readline,edit,[with_readline=no],[TARGET_HAVE_EDITLINE=0])
        TARGET_READLINE_LIBS=$LIBS
        LIBS=$sLIBS
fi
if test x"$with_readline" != xno; then
	found="yes"

	AC_ARG_WITH([readline-lib],
		[AC_HELP_STRING([--with-readline-lib],[specify readline library])],
		[with_readline_lib=$withval],
		[with_readline_lib="auto"])
	if test "x$with_readline_lib" = xauto; then
		save_LIBS="$LIBS"
		LIBS=""
		AC_SEARCH_LIBS(tgetent, [readline ncurses curses termcap], [term_LIBS="$LIBS"], [term_LIBS=""])
		AC_CHECK_LIB([readline], [readline], [TARGET_READLINE_LIBS="-lreadline"], [found="no"])
		TARGET_READLINE_LIBS="$TARGET_READLINE_LIBS $term_LIBS"
		LIBS="$save_LIBS"
	else
		TARGET_READLINE_LIBS="$with_readline_lib"
	fi

	AC_ARG_WITH([readline-inc],
		[AC_HELP_STRING([--with-readline-inc],[specify readline include paths])],
		[with_readline_inc=$withval],
		[with_readline_inc="auto"])
	if test "x$with_readline_inc" = xauto; then
		AC_CHECK_HEADER(readline.h, [found="yes"], [
			found="no"
			if test "$cross_compiling" != yes; then
				for dir in /usr /usr/local /usr/local/readline /usr/contrib /mingw; do
					for subdir in include include/readline; do
						AC_CHECK_FILE($dir/$subdir/readline.h, found=yes)
						if test "$found" = "yes"; then
							TARGET_READLINE_INC="-I$dir/$subdir"
							break
						fi
					done
					test "$found" = "yes" && break
				done
			fi
		])
	else
		TARGET_READLINE_INC="$with_readline_inc"
	fi

	if test x"$found" = xno; then
		TARGET_READLINE_LIBS=""
		TARGET_READLINE_INC=""
		TARGET_HAVE_READLINE=0
	else
		TARGET_HAVE_READLINE=1
	fi
fi

AC_SUBST(TARGET_READLINE_LIBS)
AC_SUBST(TARGET_READLINE_INC)
AC_SUBST(TARGET_HAVE_READLINE)
AC_SUBST(TARGET_HAVE_EDITLINE)

##########
# Figure out what C libraries are required to compile programs
# that use "fdatasync()" function.
#
AC_SEARCH_LIBS(fdatasync, [rt])

#########
# check for debug enabled
AC_ARG_ENABLE(debug, AC_HELP_STRING([--enable-debug],[enable debugging & verbose explain]),
      [use_debug=$enableval],[use_debug=no])
if test "${use_debug}" = "yes" ; then
  TARGET_DEBUG="-DSQLITE_DEBUG=1 -DSQLITE_ENABLE_SELECTTRACE -DSQLITE_ENABLE_WHERETRACE -O0"
else
  TARGET_DEBUG="-DNDEBUG"
fi
AC_SUBST(TARGET_DEBUG)

#########
# See whether we should use the amalgamation to build
AC_ARG_ENABLE(amalgamation, AC_HELP_STRING([--disable-amalgamation],
      [Disable the amalgamation and instead build all files separately]),
      [use_amalgamation=$enableval],[use_amalgamation=yes])
if test "${use_amalgamation}" != "yes" ; then
  USE_AMALGAMATION=0
fi
AC_SUBST(USE_AMALGAMATION)

#########
# Look for zlib.  Only needed by extensions and by the sqlite3.exe shell
AC_CHECK_HEADERS(zlib.h)
AC_SEARCH_LIBS(deflate, z, [HAVE_ZLIB="-DSQLITE_HAVE_ZLIB=1"], [HAVE_ZLIB=""])
AC_SUBST(HAVE_ZLIB)

#########
# See whether we should allow loadable extensions
AC_ARG_ENABLE(load-extension, AC_HELP_STRING([--disable-load-extension],
      [Disable loading of external extensions]),
      [use_loadextension=$enableval],[use_loadextension=yes])
if test "${use_loadextension}" = "yes" ; then
  OPT_FEATURE_FLAGS=""
  AC_SEARCH_LIBS(dlopen, dl)
else
  OPT_FEATURE_FLAGS="-DSQLITE_OMIT_LOAD_EXTENSION=1"
fi

##########
# Do we want to support memsys3 and/or memsys5
#
AC_ARG_ENABLE(memsys5, 
  AC_HELP_STRING([--enable-memsys5],[Enable MEMSYS5]),
  [enable_memsys5=yes],[enable_memsys5=no])
AC_MSG_CHECKING([whether to support MEMSYS5])
if test "${enable_memsys5}" = "yes"; then
  OPT_FEATURE_FLAGS="${OPT_FEATURE_FLAGS} -DSQLITE_ENABLE_MEMSYS5"
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi
AC_ARG_ENABLE(memsys3, 
  AC_HELP_STRING([--enable-memsys3],[Enable MEMSYS3]),
  [enable_memsys3=yes],[enable_memsys3=no])
AC_MSG_CHECKING([whether to support MEMSYS3])
if test "${enable_memsys3}" = "yes" -a "${enable_memsys5}" = "no"; then
  OPT_FEATURE_FLAGS="${OPT_FEATURE_FLAGS} -DSQLITE_ENABLE_MEMSYS3"
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

#########
# See whether we should enable Full Text Search extensions
AC_ARG_ENABLE(fts3, AC_HELP_STRING([--enable-fts3],
      [Enable the FTS3 extension]),
      [enable_fts3=yes],[enable_fts3=no])
if test "${enable_fts3}" = "yes" ; then
  OPT_FEATURE_FLAGS="${OPT_FEATURE_FLAGS} -DSQLITE_ENABLE_FTS3"
fi
AC_ARG_ENABLE(fts4, AC_HELP_STRING([--enable-fts4],
      [Enable the FTS4 extension]),
      [enable_fts4=yes],[enable_fts4=no])
if test "${enable_fts4}" = "yes" ; then
  OPT_FEATURE_FLAGS="${OPT_FEATURE_FLAGS} -DSQLITE_ENABLE_FTS4"
  AC_SEARCH_LIBS([log],[m])
fi
AC_ARG_ENABLE(fts5, AC_HELP_STRING([--enable-fts5],
      [Enable the FTS5 extension]),
      [enable_fts5=yes],[enable_fts5=no])
if test "${enable_fts5}" = "yes" ; then
  OPT_FEATURE_FLAGS="${OPT_FEATURE_FLAGS} -DSQLITE_ENABLE_FTS5"
  AC_SEARCH_LIBS([log],[m])
fi

#########
# See whether we should enable JSON1
AC_ARG_ENABLE(json1, AC_HELP_STRING([--enable-json1],
      [Enable the JSON1 extension]),
      [enable_json1=yes],[enable_json1=no])
if test "${enable_json1}" = "yes" ; then
  OPT_FEATURE_FLAGS="${OPT_FEATURE_FLAGS} -DSQLITE_ENABLE_JSON1"
fi

#########
# See whether we should enable the LIMIT clause on UPDATE and DELETE
# statements.
AC_ARG_ENABLE(update-limit, AC_HELP_STRING([--enable-update-limit],
      [Enable the UPDATE/DELETE LIMIT clause]),
      [enable_udlimit=yes],[enable_udlimit=no])
if test "${enable_udlimit}" = "yes" ; then
  OPT_FEATURE_FLAGS="${OPT_FEATURE_FLAGS} -DSQLITE_ENABLE_UPDATE_DELETE_LIMIT"
fi

#########
# See whether we should enable RTREE
AC_ARG_ENABLE(rtree, AC_HELP_STRING([--enable-rtree],
      [Enable the RTREE extension]),
      [enable_rtree=yes],[enable_rtree=no])
if test "${enable_rtree}" = "yes" ; then
  OPT_FEATURE_FLAGS="${OPT_FEATURE_FLAGS} -DSQLITE_ENABLE_RTREE"
fi

#########
# See whether we should enable the SESSION extension
AC_ARG_ENABLE(session, AC_HELP_STRING([--enable-session],
      [Enable the SESSION extension]),
      [enable_session=yes],[enable_session=no])
if test "${enable_session}" = "yes" ; then
  OPT_FEATURE_FLAGS="${OPT_FEATURE_FLAGS} -DSQLITE_ENABLE_SESSION"
  OPT_FEATURE_FLAGS="${OPT_FEATURE_FLAGS} -DSQLITE_ENABLE_PREUPDATE_HOOK"
fi

#########
# attempt to duplicate any OMITS and ENABLES into the ${OPT_FEATURE_FLAGS} parameter
for option in $CFLAGS $CPPFLAGS
do
  case $option in
    -DSQLITE_OMIT*) OPT_FEATURE_FLAGS="$OPT_FEATURE_FLAGS $option";;
    -DSQLITE_ENABLE*) OPT_FEATURE_FLAGS="$OPT_FEATURE_FLAGS $option";;
  esac
done
AC_SUBST(OPT_FEATURE_FLAGS)


# attempt to remove any OMITS and ENABLES from the $(CFLAGS) parameter
ac_temp_CFLAGS=""
for option in $CFLAGS
do
  case $option in
    -DSQLITE_OMIT*) ;;
    -DSQLITE_ENABLE*) ;;
    *) ac_temp_CFLAGS="$ac_temp_CFLAGS $option";;
  esac
done
CFLAGS=$ac_temp_CFLAGS


# attempt to remove any OMITS and ENABLES from the $(CPPFLAGS) parameter
ac_temp_CPPFLAGS=""
for option in $CPPFLAGS
do
  case $option in
    -DSQLITE_OMIT*) ;;
    -DSQLITE_ENABLE*) ;;
    *) ac_temp_CPPFLAGS="$ac_temp_CPPFLAGS $option";;
  esac
done
CPPFLAGS=$ac_temp_CPPFLAGS


# attempt to remove any OMITS and ENABLES from the $(BUILD_CFLAGS) parameter
ac_temp_BUILD_CFLAGS=""
for option in $BUILD_CFLAGS
do
  case $option in
    -DSQLITE_OMIT*) ;;
    -DSQLITE_ENABLE*) ;;
    *) ac_temp_BUILD_CFLAGS="$ac_temp_BUILD_CFLAGS $option";;
  esac
done
BUILD_CFLAGS=$ac_temp_BUILD_CFLAGS


#########
# See whether we should use GCOV
AC_ARG_ENABLE(gcov, AC_HELP_STRING([--enable-gcov],
      [Enable coverage testing using gcov]),
      [use_gcov=$enableval],[use_gcov=no])
if test "${use_gcov}" = "yes" ; then
  USE_GCOV=1
else
  USE_GCOV=0
fi
AC_SUBST(USE_GCOV)


#########
# Output the config header
AC_CONFIG_HEADERS(config.h)

#########
# Generate the output files.
#
AC_SUBST(BUILD_CFLAGS)
AC_OUTPUT([
Makefile
sqlite3.pc
])