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Using the old method in src/sys/unix/selector/mod.rs we needed to define all the targets twice, now we just do it once and set the path to the correct selector implementation. Note that is only possible because we increased MSRV so that it supports the path attribute, when the code was originally written this was not a thing.
The old macro was a mess of not(any(targets...)), means that when porting to a new target you always used the stateless implementation even if you didn't know about it. This fixes gotcha that and moves the logic of what kind of IoSourceState to use to the selector implemtnation files, which means that we don't have to worry about it when porting to a new platform.
Initially I though this would give a nice error message saying that platform X wasn't supported. But due to the amount of other errors the error message is still not great. So, to make porting easier in the future, just remove this and we'll get a `fds` not defined error.
Means we can remove the cfg_io_source! macro usage as that is already done in the selector implementation file.
Thomasdezeeuw
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Darksonn
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Jun 21, 2024
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The cfg situation in the sys::unix module is messy to say the least. This series of commits aims to clean them up.