Quoting Richard Guenther <richard.guent...@gmail.com>:

Well.  Some things really ought to stay as macros.  You can always
error out if a multi-target compiler would have conflicts there at
configure time.

So what are we going to do about all the tree optimizers and frontends that
use BITS_PER_UNIT?
Should they all include tm.h, with the hazard that more specific
macros creep in?
Or do we want to put this in a separate header file?

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