?RCS:
?RCS: Copyright (c) 2013, 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:
?MAKE:d_sigaltstack: Trylink cat
?MAKE:	-pick add $@ %<
?S:d_sigaltstack:
?S:	This variable conditionally defines the HAS_SIGALTSTACK symbol, which
?S:	indicates that the sigaltstack() routine is available to define an
?S:	alternate signal stack.
?S:.
?C:HAS_SIGALTSTACK:
?C:	This symbol, if defined, indicates that the sigaltstack() routine
?C:	is available to define an alternate signal stack.
?C:.
?H:#$d_sigaltstack HAS_SIGALTSTACK	/**/
?H:.
?LINT:set d_sigaltstack
: see if we have sigaltstack
$cat >try.c <<EOC
#include <stdio.h>
#include <signal.h>
int main(void)
{
	stack_t ss;
	static int ret;
	ss.ss_sp = NULL;
	ss.ss_flags |= SS_ONSTACK | SS_DISABLE;
	ss.ss_size = SIGSTKSZ + MINSIGSTKSZ;
	ret |= sigaltstack(&ss, NULL);
	return ret ? 0 : 1;
}
EOC
cyn=sigaltstack
set d_sigaltstack
eval $trylink