[TUHS] History of popularity of C

[Richard Salz]

> But yeah, I'd prefer the if(0) type of elimination.
>

Some parts of OpenSSL do this, and it seems to work well across a pretty
wide variety of platforms/toolchains.

A really important benefit is that you get code syntax-checked as opposed
to unused #ifdef branches rotting.  A minor benefit is you don't have ifdef
spaghetti around local variables, to avoid "xxx is not used" warnings.
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