ObjFW  Check-in [0db06dfe03]

AC_CHECK_FUNC(gmtime_r, [
	AC_DEFINE(HAVE_GMTIME_R, 1, [Whether we have gmtime_r])
])
AC_CHECK_FUNC(localtime_r, [
	AC_DEFINE(HAVE_LOCALTIME_R, 1, [Whether we have localtime_r])
])

AC_MSG_CHECKING(for tm_gmtoff in struct tm)
AC_TRY_COMPILE([
	#define _GNU_SOURCE
	#include <time.h>
], [
	struct tm tm;
	tm.tm_gmtoff = 0;
], [
	AC_DEFINE(STRUCT_TM_HAS_TM_GMTOFF, 1, [Whether struct tm has tm_gmtoff])
	AC_MSG_RESULT(yes)
], [
	AC_MSG_RESULT(no)
])

AC_CHECK_FUNC(kqueue, [
	AC_DEFINE(HAVE_KQUEUE, 1, [Whether we have kqueue])
	AC_SUBST(OFSTREAMOBSERVER_KQUEUE_M, "OFStreamObserver_kqueue.m")
])
AC_CHECK_HEADER(poll.h, [
	AC_DEFINE(HAVE_POLL_H, 1, [Whether we have poll.h])
	AC_SUBST(OFSTREAMOBSERVER_POLL_M, "OFStreamObserver_poll.m")

		tm.tm_isdst = -1;

		if (of_strptime([string UTF8String], [format UTF8String],
		    &tm) == NULL)
			@throw [OFInvalidFormatException
			    exceptionWithClass: isa];

#ifdef STRUCT_TM_HAS_TM_GMTOFF
		if (tm.tm_gmtoff != 0)
			@throw [OFInvalidFormatException
			    exceptionWithClass: isa];
#endif

		/* Years */
		seconds = (int64_t)(tm.tm_year - 70) * 31536000;
		/* Days of leap years, excluding the year to look at */
		seconds += (((tm.tm_year + 1899) / 4) - 492) * 86400;
		seconds -= (((tm.tm_year + 1899) / 100) - 19) * 86400;
		seconds += (((tm.tm_year + 1899) / 400) - 4) * 86400;
		/* Leap day */