Re: only run submake if that submake needs to be run?

[Boris Kolpackov]

Paul D. Smith <address@hidden> writes:
 
> I didn't look to see how these are defined but I don't see how they can
> work in general.
> 
> Consider, for example, something like this:
> 
>     XXFLAGS += -a
> 
>     foo.yy: foo.xx
>             $(XX) $(XXFLAGS) -o $@ $<
> 
> The XXFLAGS reference is embedded into a rule, so if you change the name
> of the variable it won't resolve properly when the rule is invoked.
> 
> 
> You can do this kind of frame idea only if you never have any rules
> defined in your included makefiles... right?

Not quite for I use target/pattern-specific variables in rules. It proved
to work surprisingly well for me.

-boris

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