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[QUOTE="Nick, post: 3982792"]
I've given further thought, and given that you are limited in what you
can run that understands the target architecture (essentially, limited
to the compiler) I think you have to use the standard pre-processor.

In that case, I think you might need to do something like this:
Write a configuration program in whatever language you use that does all
the calculations on your constants - so (FOO*(FOO-1)+2) as above.

It should also read in an entire system of names for every plausible
type in your target C dialects, in increasing size for each type and
signedness.

Then it can loop round and find the best size for the results of each
evaluation, and spit out a small header file to be included.

There's a bit of work in defining the names, but no more than you'll
need to do in your current architecture specific header files, and you
can probably use a much more reader-friendly syntax (reading it from a
configuration file, probably).

I can't see a better way.
[/QUOTE]

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