General Motors, facing rising commodity costs in a trade showdown with Europe and elsewhere, cut its outlook for the year.The diminished expectations overshadowed a strong second quarter and shares tumbled more than 5 percent before the opening bell. Other

A $7.3 billion accounting charge pushed General Motors into a $3.9 billion net loss for 2017, but without the expense the company posted record per-share earnings.Excluding one-time items, GM made a $9.9 billion profit, or $6.62 per share, the highest...