?RCS: $Id: i_time.U 167 2013-05-08 17:58:00Z rmanfredi $
?RCS:
?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi
?RCS: 
?RCS: You may redistribute only under the terms of the Artistic License,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic License; a copy of which may be found at the root
?RCS: of the source tree for dist 4.0.
?RCS:
?RCS: $Log: i_time.U,v $
?RCS: Revision 3.0  1993/08/18  12:08:45  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?X:
?X: This unit finds which "time" include to use. If 'timezone' is used by the
?X: program, we also try to find which header should be included. Eventually,
?X: we look for <sys/select.h> if I_SYSSELECT is used, to get struct timeval.
?X:
?MAKE:i_time i_systime i_systimek timeincl: cat cc ccflags contains rm \
	echo n c +i_sysselct Findhdr
?MAKE:	-pick add $@ %<
?S:i_time:
?S:	This variable conditionally defines I_TIME, which indicates
?S:	to the C program that it should include <time.h>.
?S:.
?S:i_systime:
?S:	This variable conditionally defines I_SYS_TIME, which indicates
?S:	to the C program that it should include <sys/time.h>.
?S:.
?S:i_systimek:
?S:	This variable conditionally defines I_SYS_TIME_KERNEL, which
?S:	indicates to the C program that it should include <sys/time.h>
?S:	with KERNEL defined.
?S:.
?S:timeincl:
?S:	This variable holds the full path of the included time header(s).
?S:.
?C:I_TIME (USE_TIME_H):
?C:	This symbol, if defined, indicates to the C program that it should
?C:	include <time.h>.
?C:.
?C:I_SYS_TIME (I_SYSTIME USE_SYS_TIME_H NO_TIME_WITH_SYS_TIME):
?C:	This symbol, if defined, indicates to the C program that it should
?C:	include <sys/time.h>.
?C:.
?C:I_SYS_TIME_KERNEL (I_SYSTIMEKERNEL):
?C:	This symbol, if defined, indicates to the C program that it should
?C:	include <sys/time.h> with KERNEL defined.
?C:.
?H:#$i_time I_TIME		/**/
?H:#$i_systime I_SYS_TIME		/**/
?H:#$i_systimek I_SYS_TIME_KERNEL		/**/
?H:.
?W::timezone
?T:xselect flags sysselect s_timeval s_timezone
?LINT:change i_sysselct
: see if we should include time.h, sys/time.h, or both
echo " "
echo "Testing to see if we should include <time.h>, <sys/time.h> or both." >&4
$echo $n "I'm now running the test program...$c"
$cat >try.c <<'EOCP'
#include <sys/types.h>
#ifdef I_TIME
#include <time.h>
#endif
#ifdef I_SYSTIME
#ifdef SYSTIMEKERNEL
#define KERNEL
#endif
#include <sys/time.h>
#endif
#ifdef I_SYSSELECT
#include <sys/select.h>
#endif
int main(void)
{
	struct tm foo;
#ifdef S_TIMEVAL
	struct timeval bar;
#endif
#ifdef S_TIMEZONE
	struct timezone tzp;
#endif
	if (foo.tm_sec == foo.tm_sec)
		return 0;
#ifdef S_TIMEVAL
	if (bar.tv_sec == bar.tv_sec)
		return 0;
#endif
	return 1;
}
EOCP
flags=''
@if I_SYSSELECT
if $contains 'timeval.*{' `./findhdr sys/select.h` >/dev/null 2>&1; then
	xselect='-DI_SYSSELECT'
else
	xselect=''
fi
@end
@if timezone
for s_timezone in '-DS_TIMEZONE' ''; do
@else
s_timezone=''
@end
?X: Every package is given a try with 'struct timeval'
@if I_SYSSELECT
for sysselect in $xselect ''; do
@else
sysselect=''
@end
for s_timeval in '-DS_TIMEVAL' ''; do
for i_systimek in '' '-DSYSTIMEKERNEL'; do
for i_time in '' '-DI_TIME'; do
for i_systime in '-DI_SYSTIME' ''; do
	case "$flags" in
	'') $echo $n ".$c"
		if $cc $ccflags \
		$i_time $i_systime $i_systimek $sysselect $s_timeval $s_timezone \
		-o try try.c >/dev/null 2>&1 ; then
			set X $i_time $i_systime $i_systimek $sysselect $s_timeval
			shift
			flags="$*"
			echo " "
			$echo $n "Succeeded with $flags$c"
		fi
		;;
	esac
done
done
done
done
@if I_SYSSELECT
done
@end
@if timezone
done
@end
timeincl=''
echo " "
case "$flags" in
*SYSTIMEKERNEL*) i_systimek="$define"
	timeincl=`./findhdr sys/time.h`
	echo "We'll include <sys/time.h> with KERNEL defined." >&4;;
*) i_systimek="$undef";;
esac
case "$flags" in
*I_TIME*) i_time="$define"
	timeincl=`./findhdr time.h`" $timeincl"
	echo "We'll include <time.h>." >&4;;
*) i_time="$undef";;
esac
case "$flags" in
*I_SYSTIME*) i_systime="$define"
	timeincl=`./findhdr sys/time.h`" $timeincl"
	echo "We'll include <sys/time.h>." >&4;;
*) i_systime="$undef";;
esac
@if I_SYSSELECT
case "$flags" in
*I_SYSSELECT*) i_sysselct="$define"
	timeincl=`./findhdr sys/select.h`" $timeincl"
	echo "We'll also include <sys/select.h> to get struct timeval." >&4;;
*) case "$i_sysselct" in
	'') i_sysselct="$undef";;
	esac
esac
@end
$rm -f try.c try