gets() is still in the C language, despite it being next to impossible to use safely. But if you link against it, some platforms give you a big scary warning. If you're standards-conforming, you have to have it though. Removing it is an API/ABI change.
In some ways, the situation with ARM's memory remapping sounds similar: a dangerous practice that seems to work suitably, despite the potential for it to go pear shaped when you least expect.
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