PR c/32295
	* c-typeck.c (default_conversion): Call require_complete_type
	before perform_integral_promotions.
	(build_unary_op): Call require_complete_type except for ADDR_EXPR.
	(build_c_cast): Call require_complete_type except for casts to
	void types.
	(convert_for_assignment): Call require_complete_type.

testsuite:
	* gcc.dg/enum-incomplete-1.c: New test.

From-SVN: r128765