[PATCH] D71082: Allow system header to provide their own implementation of some builtin

[Reid Kleckner via Phabricator via cfe-commits]

rnk added a comment.

It's unsurprising that the Linux kernel's own Fortify implementation is incompatible with Clang. The whole feature should never have been implemented in the library to begin with, but here we are. I think the Linux kernel folks would prefer it if we can fix forward and find a way to make their Fortify implementation work, though.

For fixing forward, the question is, why did LLVM emit a standalone call to mempcy? Did LLVM inline the thing marked always_inline? Or did `__builtin_memcpy` compile down to `call i8* @memcpy(...)` instead of `call void @llvm.memcpy.*`?


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D71082/new/

https://reviews.llvm.org/D71082