sequence.ac

这是国外的resip协议栈

# $Id: sequence.ac,v 1.3 2004/10/28 18:14:30 bostic Exp $

# Try and configure sequence support.
AC_DEFUN(AM_SEQUENCE_CONFIGURE, [
	AC_MSG_CHECKING([for 64-bit integral type support for sequences])
	db_cv_build_sequence="yes"

	# Have to have found 64-bit types to support sequences.  If we don't
	# find the native types, we try and create our own.
	if test "$ac_cv_type_int64_t" = "no" -a -z "$int64_decl"; then
		db_cv_build_sequence="no"
	fi
	if test "$ac_cv_type_uint64_t" = "no" -a -z "$u_int64_decl"; then
		db_cv_build_sequence="no"
	fi

	# Have to be able to cast variables to the "unsigned long long" and
	# "long long" types, that's our cast for the printf "%ll[du]" format.
	if test "$ac_cv_type_long_long" = "no"; then
		db_cv_build_sequence="no"
	fi
	if test "$ac_cv_type_unsigned_long_long" = "no"; then
		db_cv_build_sequence="no"
	fi

	# Test to see if we can declare variables of the appropriate size
	# and format them.  If we're cross-compiling, all we get is a link
	# test, which won't test for the appropriate printf format strings.
	if test "$db_cv_build_sequence" = "yes"; then
		AC_TRY_RUN([
		main() {
			long long l;
			unsigned long long u;
			char buf[100];

			buf[0] = 'a';
			l = 9223372036854775807LL;
			(void)snprintf(buf, sizeof(buf), "%lld", l);
			if (strcmp(buf, "9223372036854775807"))
				return (1);
			u = 18446744073709551615ULL;
			(void)snprintf(buf, sizeof(buf), "%llu", u);
			if (strcmp(buf, "18446744073709551615"))
				return (1);
			return (0);
		}],, [db_cv_build_sequence="no"],
		AC_TRY_LINK(,[
			long long l;
			unsigned long long u;
			char buf[100];

			buf[0] = 'a';
			l = 9223372036854775807LL;
			(void)snprintf(buf, sizeof(buf), "%lld", l);
			if (strcmp(buf, "9223372036854775807"))
				return (1);
			u = 18446744073709551615ULL;
			(void)snprintf(buf, sizeof(buf), "%llu", u);
			if (strcmp(buf, "18446744073709551615"))
				return (1);
			return (0);
		],, [db_cv_build_sequence="no"]))
	fi
	if test "$db_cv_build_sequence" = "yes"; then
		AC_DEFINE(HAVE_SEQUENCE)
		AH_TEMPLATE(HAVE_SEQUENCE,
		    [Define to 1 if building sequence support.])

		AC_SUBST(db_seq_decl)
		db_seq_decl="typedef int64_t db_seq_t;";
	else
		# It still has to compile, but it won't run.
		db_seq_decl="typedef int db_seq_t;";
	fi
	AC_MSG_RESULT($db_cv_build_sequence)
])