Is this a compiler bug in MinGW?

[boreal igloo]

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[pastel granite]

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[cedar swift]

It's almost definitely due to that. It doesn't look like gcc will automatically add a return for wmain the same way it does for standard main. https://godbolt.org/z/94oc7bczb

[boreal igloo]

yes, when placing return 0 it suddenly now works

definitely a mingw bug