<slaps forehead> D'oh! I remember that feature now, but it didn't occur to me to use it like that. Thanks, Paul.
--matthew Matthew Sanderson Senior Programmer (UNIX) TCG Information Systems Pty Ltd Sydney, Australia [EMAIL PROTECTED] http://www.formtrap.com/ +61 (02) 8303 2407 On Fri, 21 Oct 2005, Paul D. Smith wrote: > %% 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
