Auto Config

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autofoo macros for lua libraries

$ ./configure --with-lua=''lua_dir''

You'll get the follwing automake macros @LUA_INCLUDES@ and @LUA_LIBS@

and the following #defines in config.h

/* Define to 1 if you have the <lualib.h> header file. */
#define HAVE_LUALIB_H 1

/* Define to use Lua 5.1 */
#define HAVE_LUA_5_1 1

/* Define to 1 if you have the <lua.h> header file. */
#define HAVE_LUA_H 1

These are the two parts to add

This one for acinclude.m4

If --with-lua is not specified, the script should attempt to get the C flags and link flags from pkg-config. --JohnBelmonte

#
# AC_ETHEREAL_LIBLUA_CHECK
#
AC_DEFUN([AC_ETHEREAL_LIBLUA_CHECK],[

	if test "x$lua_dir" != "x"
	then
		#
		# The user specified a directory in which liblua resides,
		# so add the "include" subdirectory of that directory to
		# the include file search path and the "lib" subdirectory
		# of that directory to the library search path.
		#
		# XXX - if there's also a liblua in a directory that's
		# already in CFLAGS, CPPFLAGS, or LDFLAGS, this won't
		# make us find the version in the specified directory,
		# as the compiler and/or linker will search that other
		# directory before it searches the specified directory.
		#
		ethereal_save_CFLAGS="$CFLAGS"
		CFLAGS="$CFLAGS -I$lua_dir/include"
		ethereal_save_CPPFLAGS="$CPPFLAGS"
		CPPFLAGS="$CPPFLAGS -I$lua_dir/include"
		ethereal_save_LIBS="$LIBS"
		LIBS="$LIBS -L$lua_dir/lib -llua"
		ethereal_save_LDFLAGS="$LDFLAGS"
		LDFLAGS="$LDFLAGS -L$lua_dir/lib"
	else 
		#
		# The user specified no directory in which liblua resides,
		# so just add "-llua -lliblua" to the used libs.
		#
		ethereal_save_CFLAGS="$CFLAGS"
		ethereal_save_CPPFLAGS="$CPPFLAGS"
		ethereal_save_LDFLAGS="$LDFLAGS"
		ethereal_save_LIBS="$LIBS"
		LIBS="$LIBS -llua"
	fi

	#
	# Make sure we have "lua.h", "lualib.h" and "lauxlib.h".  If we don't, it means we probably
	# don't have liblua, so don't use it.
	#
	AC_CHECK_HEADERS(lua.h lualib.h lauxlib.h,,
	[
		if test "x$lua_dir" != "x"
		then
			#
			# The user used "--with-lua=" to specify a directory
			# containing liblua, but we didn't find the header file
			# there; that either means they didn't specify the
			# right directory or are confused about whether liblua
			# is, in fact, installed.  Report the error and give up.
			#
			AC_MSG_ERROR([liblua header not found in directory specified in --with-lua])
		else
			if test "x$want_lua" = "xyes"
			then
				#
				# The user tried to force us to use the library, but we
				# couldn't find the header file; report an error.
				#
				AC_MSG_ERROR(Header file lua.h not found.)
			else
				#
				# We couldn't find the header file; don't use the
				# library, as it's probably not present.
				#
				want_lua=no
			fi
		fi
	])

	if test "x$want_lua" != "xno"
	then
		#
		# Well, we at least have the lua header file.
		#
		# let's check if the libs are there
		#

                 # At least on Suse 9.3 systems, liblualib needs linking
  	         # against libm.
  	         LIBS="$LIBS $LUA_LIBS -lm"
  	 
		AC_CHECK_LIB(lua, lua_call,
		[
			if test "x$lua_dir" != "x"
			then
				#
				# Put the "-I" and "-L" flags for lua at
				# the beginning of CFLAGS, CPPFLAGS,
				# LDFLAGS, and LIBS.
				#
				LUA_LIBS="-L$lua_dir/lib -llua"
				LUA_INCLUDES="-I$lua_dir/include"
			else
				LUA_LIBS="-llua"
				LUA_INCLUDES=""
			fi

			#
			# we got lua, now look for lualib
			#
			AC_CHECK_LIB(lualib, luaL_openlib,
			[
				#
				# we have 5.0
				#
				LUA_LIBS="$LUA_LIBS -llualib"
			],[
				#
				# no lualib, in 5.1 there's only liblua
				# do we have 5.1?
				#
				
				LIBS="$ethereal_save_LIBS $LUA_LIBS"

				AC_CHECK_LIB(lua, luaL_register,
				[
				    #
				    #  Lua 5.1 found
				    #
				    AC_DEFINE(HAVE_LUA_5_1, 1, [Define to use Lua 5.1])
				],[
				    #
				    # No, it is not 5.1
				    #
				    if test "x$lua_dir" != "x"
				    then
				        #
				        # Restore the versions of CFLAGS, CPPFLAGS,
				        # LDFLAGS, and LIBS before we added the
				        # "--with-lua=" directory, as we didn't
				        # actually find lua there.
				        #
				        CFLAGS="$ethereal_save_CFLAGS"
				        CPPFLAGS="$ethereal_save_CPPFLAGS"
				        LDFLAGS="$ethereal_save_LDFLAGS"
				        LIBS="$ethereal_save_LIBS"
				        LUA_LIBS=""
				    fi
				    # User requested --with-lua but it isn't available
				    if test "x$want_lua" = "xyes"
				    then
				        AC_MSG_ERROR(Linking with liblualib failed.)
				    fi
				    want_lua=no
				])
			])
		],[  
			#
			# Restore the versions of CFLAGS, CPPFLAGS,
			# LDFLAGS, and LIBS before we added the
			# "--with-lua=" directory, as we didn't
			# actually find lua there.
			#
			CFLAGS="$ethereal_save_CFLAGS"
			CPPFLAGS="$ethereal_save_CPPFLAGS"
			LDFLAGS="$ethereal_save_LDFLAGS"
			LIBS="$ethereal_save_LIBS"
			LUA_LIBS=""
			# User requested --with-lua but it isn't available
			if test "x$want_lua" = "xyes"
			then
				AC_MSG_ERROR(Linking with liblua failed.)
			fi
			want_lua=no
		])

	CFLAGS="$ethereal_save_CFLAGS"
	CPPFLAGS="$ethereal_save_CPPFLAGS"
	LDFLAGS="$ethereal_save_LDFLAGS"
	LIBS="$ethereal_save_LIBS"
	AC_SUBST(LUA_LIBS)
	AC_SUBST(LUA_INCLUDES)

	fi
])

dnl lua check
AC_MSG_CHECKING(whether to use liblua)

AC_ARG_WITH(lua,
[  --with-lua[[=DIR]]       use liblua (located in directory DIR, if supplied) for the lua scripting plugin.  [[default=no]]],
[
	if test $withval = no
	then
		want_lua=no
	elif test $withval = yes
	then
		want_lua=yes
	else
		want_lua=yes
		lua_dir=$withval
	fi
],[
	#
	# Use liblua if it's present, otherwise don't.
	#
	want_lua=no
	lua_dir=
])
if test "x$want_lua" = "xno" ; then
	AC_MSG_RESULT(no)
else
	AC_MSG_RESULT(yes)
	AC_ETHEREAL_LIBLUA_CHECK
	if test "x$want_lua" = "xno" ; then
		AC_MSG_RESULT(liblua not found - disabling support for the lua scripting plugin)
	fi
fi
AM_CONDITIONAL(HAVE_LIBLUA, test x$want_lua = xyes)