Programming

This is one of these really easy things that's made ridiculously hard because make does all substitutions backwards. Have VAR1=a/*.in, and VAR2=$(VAR1:.in=.out), and it will happily substitute a/*.out for a/*.in, find no files matching *.out, and become an empty string. I had to force it with $(subst) and $(wildcard).

Code:

all:dira dirb
# a/1.in, a.2.in, ... a/10.in becomes targets a/1.out, ...
dira:$(subst .in,.out,$(wildcard a/*.in))
dirb:$(subst .in,.out,$(wildcard b/*.in))

%.out:%.in
        touch $@

Granted this isn't dynamic targets but dynamic sources, but this is at least a step toward it.

$(subst) and $(wildcard) solved my Problem.Thanks a lot for the input.