Yes. The thing to keep in mind is that much of the .if stuff is done
at parsing or rule construction time. So if you change something
(creating a file, say), then that condition won't be re-evaluated.
For the specific example given, one could replace much of the goo
with:
target: foobar
foobar:
touch foobar
if you wanted to create foobar. Otherwise, I'd be tempted not to use
.if exists. I'd be tempted to do something more like:
target:
@-if [ -f foobar ]; then cat foobar; else touch foobar; fi
where you have the shell check.
The primary use of exists() I've seen is:
.if exists(foo.mk)
.include "foo.mk"
.endif
although I have seen others.
Warner
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