[PATCH] D131628: [LangRef] Add description for nocallback attribute

[Daniel Thornburgh via Phabricator via llvm-commits]

mysterymath added a comment.

In D131628#3898605 <https://reviews.llvm.org/D131628#3898605>, @nlopes wrote:

> So, dropping `nocallback` during linking seems the way to go (and adjust the docs accordingly). Once you link, you can do inter-proc analysis and recover that info if needed anyway.

This would make Clang the only implementation of `__attribute__((leaf))` to do so.
It's also not generally possible to recover the nocallback information about functions external to the LTO unit, which is the only thing `__attribute__((leaf))` is actually good for in full LTO.


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