* c-tree.h (skip_evaluation): Move declaration...
* c-common.h: ... here.
* c-typeck.c (build_external_ref): Don't assemble_external nor
mark a tree as used if skip_evaluation is set.
* c-parse.in (typeof): New non-terminal to set skip_evaluation
around TYPEOF.
(typespec_nonreserved_nonattr): Use it.

From-SVN: r56358