%% Matthew Sanderson <[EMAIL PROTECTED]> writes:
ms> To be precise: I am defining a presence-only dependency of A on B
ms> to mean that A depends only on the presence of a file named B; B's
ms> last-mod-time is not taken into account. A will not be
ms> re-generated if B is newer; but if B is missing, a seperate
ms> (normal) rule may re-generate it, and if so, then afterwards the
ms> presence-only dependency rule will cause A to also be re-generated
ms> from the just-created B.
I think you can do this with current capabilities, like this:
A: $(if $(wildcard B),,B)
which will result in "A: B" if B does _NOT_ exist, or just "A:" (with no
prerequisite) if B _DOES_ exist.
--
-------------------------------------------------------------------------------
Paul D. Smith <[EMAIL PROTECTED]> Find some GNU make tips at:
http://www.gnu.org http://make.paulandlesley.org
"Please remain calm...I may be mad, but I am a professional." --Mad Scientist
_______________________________________________
Help-make mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/help-make
