[CMake] automatically re-generating makefiles

[Matthew Woehlke]

Brad King wrote:
> The problem with
> 
>   Makefile: input-foo.txt input-bar.txt
>     regenerate-rule
> 
> is that when someone removes "input-bar.txt" from disk Make will refuse
> to run the regeneration rule.

Ah, wasn't thinking about that. Thanks for the info.

-- 
Matthew
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