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[libc] Support configurable errno modes #98287
[libc] Support configurable errno modes #98287
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it would probably be best to make the default value
LIBC_ERRNO_MODE_THREAD_LOCAL
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I agree but the problem is that we currently don't have any mechanism to distinguish the overlay from the full build mode, and in the overlay mode we want to default to
LIBC_ERRNO_MODE_SYSTEM
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this file gets auto-generated, so the docs here need to be also in the json file
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I don't think JSON is particularly suited for multiline strings so I moved the explanation of different modes as comments to the implementation file.
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Don't forget to update to
LIBC_NAMESPACE_DECL
when that stuff lands. (I'm not sure it technically matters as long as it was done in libc_errno.h, but I think uniformity it what we're going for regardless.)There was a problem hiding this comment.
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Ack, I expect this change is going to land after that one.