Feb 20 (Reuters) - Futures for Canada's main stock index edged higher on Friday, as gold prices extended gains amid growing concerns of a potential conflict between the United States and Iran.

March futures on S&P/TSX composite index gained 0.3%, as of 5:16 a.m. ET.

Toronto's benchmark index hit a record high on Thursday on the back of gains in commodity-linked stocks, even as Wall Street ended lower. The benchmark is on track to gain for a third consecutive week.

U.S. President Donald Trump warned Iran on Thursday of "really bad things" if the major crude-producing country fails to reach a "meaningful" agreement over its nuclear program in the next 10-15 days.

Spot gold gained 0.6%, though it looked set for weekly declines, as the U.S. dollar rose to a near one-month high. Silver gained 3% and copper prices also rose. [GOL/]

Oil prices declined, as traders remained unfazed on supply outlook despite Trump's comments increasing worries about a potential U.S.-Iran conflict. [O/R]

Brent crude futures and U.S. West Texas Intermediate crude were down more than 0.5% each, but look set for their first weekly gains in three. 

Investors will also look at U.S. Personal Consumption Expenditures report due later in the day, for further clues on the central bank's policy trajectory.

In after-market earnings on Thursday, gold miners Lundin Gold and Eldorado Gold beat fourth-quarter profit estimates.

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(Reporting by Utkarsh Tushar Hathi; Editing by Krishna Chandra Eluri)