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I will soon commit a patch that breaks (and xfails) gcc.dg/Wstrict-overflow-18.c, see https://gcc.gnu.org/ml/gcc-patches/2017-04/msg00986.html. As asked by Martin, this PR is here to track this regression. Most likely this will be solved by Richard (or someone else) killing -Wstrict-overflow.
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=247123