RE: "partially terminal" rule?

[Paul Smith]

On Tue, 2011-12-13 at 14:38 -0800, Mark Galeck (CW) wrote:
> I need all these things, yet, I want the rule for target% to only
> apply if prerequisite0% actually exists.  I do not want to chain with
> the rule for prerequisite0%, I do want to chain with the rule for
> prerequisite1%.  
> 
> If I put target%:, I chain with both.  If I put target%::, I chain
> with none.  I want to chain with exactly one of them.

Nope, nothing like that is possible.

The best you can do is set a target-specific variable on target%, then
in the rule for prerequisite0% you can see if the variable is set and if
so and the target file (prerequisite0%) doesn't exist, you can fail.
However, that doesn't stop the chaining behavior (so any prerequisites
of prerequisite0% will still be checked and rebuilt) etc.

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