[jamming] Generated header files

[John Waugh]

I have a rule that calls a script which generates some .h files, which are
included by other .cpp files.

This works fine for the most part, except when the .h files need to be
generated freshly.
Jam's header scanning applies NoCare to the headers, so if the .h files
don't exist, jam doesn't cause them to be generated.

Any way around this?
There's no "UnNoCare" rule, I presume (:

Of course I can also have some special target such as 'generate' which will
just force the files to be created, but ideally a user would just have to
build the main project, which will cause the headers to be generated as
needed.

Tips?

-John
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