Trans-Atlantic and other trade wars would have "a long-term impact on the global economy", he said at a Berlin meeting with German Chancellor Angela Merkel and leaders of the IMF, World Bank and other worldwide institutions.
Paris also delivered a withering response to the United States president's tweeted instruction for American officials to withhold their endorsement.
"International cooperation can not be dictated by fits of anger and throwaway remarks", Macron said in a statement.
"We have spent two days to secure a text and commitments". We are sticking to them and whoever reneges on them is showing incoherence and inconsistency. He later said leaders should be "worthy" of their people. "We make commitments and keep them".
Last year, the USA president was wowed by a French military parade in Paris after being invited to join Mr Macron for his country's annual Bastille Day celebrations.
"We need Russian Federation for disarmament talks" and for discussions about both Ukraine and Syria, Merkel said.
During a rare solo news conference earlier Saturday, Trump said he pressed for the G7 countries to eliminate all tariffs, trade barriers and subsidies in their trading practices.
Officials from Justin Trudeau's team also shared an image of the Canadian PM and summit host leader being presented with work by Prime Minister Theresa May, Mr Macron and Mrs Merkel, while an uninterested Mr Trump stares into space.
Asked whether she could imagine the idea of a complete abolition of tariffs proposed at some point with Trump, Merkel said that in an ideal case this could be achieved, but cautioned that the issue of subsidies should also be taken into account. Minimum is 17B. Tax Dairy from us at 270%. He said he was unhappy at an end-of-summit press conference by Trudeau after he left the summit, in which Trudeau said Canada would retaliate against USA trade tariffs.
"Day two of the G7 summit in Canada: spontaneous meeting between two working sessions." . John McCain, who said Americans would continue to stand with its historical allies.
US President Donald Trump is seated amid a crowd of officials. The G-8 was downgraded back to a G-7 following Putin's annexation of Crimea in 2014.