PR c/77490
	* c.opt (Wbool-operation): New.

	* c-typeck.c (build_unary_op): Warn about bit not on expressions that
	have boolean value.  Warn about ++/-- on booleans.

	* typeck.c (cp_build_unary_op): Warn about bit not on expressions that
	have boolean value.

	* doc/invoke.texi: Document -Wbool-operation.

	* c-c++-common/Wbool-operation-1.c: New test.
	* gcc.dg/Wbool-operation-1.c: New test.

From-SVN: r240462