dnl Autoconf extension macros for libIDL

AC_DEFUN([AC_CPP_ACCEPT_IDL],

	[AC_CACHE_CHECK([if C preprocessor likes IDL],

		ac_cv_cpp_accept_idl,

		[AC_TRY_CPP([

			#pragma prefix "foo.org"

			module FOO {

				typedef unsigned long long big;

				interface BAR {

					readonly attribute big number;

				};

			};

		],

		ac_cv_cpp_accept_idl=yes,

		ac_cv_cpp_accept_idl=no)])])

AC_DEFUN([AC_CPP_PIPE_STDIN],

	[AC_CACHE_CHECK([if C preprocessor can read from stdin],

		ac_cv_cpp_pipe_stdin,

		[AC_REQUIRE_CPP

		if echo | $CPP - 2>/dev/null 1>&2 ; then

			ac_cv_cpp_pipe_stdin=yes

		else

			ac_cv_cpp_pipe_stdin=no

		fi])

	if test $ac_cv_cpp_pipe_stdin = yes ; then

		AC_DEFINE(HAVE_CPP_PIPE_STDIN)

	fi])

AC_DEFUN([AC_UPDATE_IF_CHANGED],

	[if test -f "$2"; then

		if cmp -s "$1" "$2" 2>/dev/null; then

			echo "$1 is unchanged"

		else

			echo "$1 has changed"

			rm -f "$1"

			cp "$2" "$1"

		fi

	fi])