?RCS:
?RCS: Copyright (c) 2012 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_mempcpy: Trylink cat
?MAKE:	-pick add $@ %<
?S:d_mempcpy:
?S:	This variable conditionally defines the HAS_MEMPCPY symbol, which
?S:	indicates to the C program that the mempcpy() routine is available
?S:	to copy blocks of memory and returns a pointer past the last written
?S:	byte.
?S:.
?C:HAS_MEMPCPY:
?C:	This symbol, if defined, indicates that the mempcpy routine is available
?C:	to copy blocks of memory, returning a pointer past the last written byte.
?C:.
?H:#$d_mempcpy HAS_MEMPCPY	/**/
?H:.
?LINT:set d_mempcpy
: see if mempcpy exists
?X:
?X: Need some extra code convolutions to avoid gcc's optimizing the mempcpy()
?X: call with its built-in implementation.
?X:
$cat >try.c <<EOC
#include <string.h>

void *copy(void *d, const void *s, unsigned n)
{
	char *q = d;
	const char *r = s;
	return mempcpy(q + 4, r + 2, n - 1);
}

int main(void)
{
	static char src, dst;
	void *p;
	p = copy(&dst, &src, sizeof(dst));
	return p ? 0 : 1;
}
EOC
cyn=mempcpy
set d_mempcpy
eval $trylink