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Nicolas Fella authored
As discussed in https://mail.kde.org/pipermail/plasma-devel/2020-August/118263.html we agreed that requiring C++17 in Plasma is fine. There's no code that actually uses C++17 features yet, but specifying the requirement anyway has advantages. 1) It documents the policy in a much more discoverable place than a wiki page or similar could do 2) Building in 17 mode allows the compiler to do some stuff implicitly, like guranteed copy elision
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