Question about order dependencies

[drwowe]

Suppose I have the following makefile:
foo: ...
   ...
bar: ...
   ...
all: foo bar

Here's the problem:  I need to make sure foo completes before bar is
started, but only if foo was going to be executed anyway.  The obvious
thing, making a dependency "bar: foo" is wrong, because the user needs to be
able to say "make bar" on the command line without building foo. 
Ordering-only dependencies seemed at first glance to be what I needed, but
it turns out that saying "bar: | foo" still forces foo to get built.

Anyway, I came up with a very ugly workaround by checking the MAKECMDGOALS
and adding "bar: foo" conditionally if "all" or "foo" is on the command
line, but I was wondering if there was an easier way to impose ordering
constraints on goals without triggering new goals?
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