PR c/25682
	* c-typeck.c (build_unary_op): Fold offsetof-like expressions
	even when the pointer is not NULL.
cp/
	* decl.c (compute_array_index_type): After issuing not an integral
	constant-expression error, set size to 1 to avoid ICEs later on.
testsuite/
	* gcc.dg/pr25682.c: New test.
	* g++.dg/parse/array-size2.C: New test.

From-SVN: r109812