[PATCH] D138337: Add support for kcfi-seal optimization with LTO

[Sami Tolvanen via Phabricator via cfe-commits]

samitolvanen added a comment.

In D138337#3972009 <https://reviews.llvm.org/D138337#3972009>, @pcc wrote:

> Can't this be implicit if LTO is being used?

I would prefer to keep this behind a flag (similarly to `-mibt-seal`), so we can better control when and where the optimization enabled. For example, enabling this implicitly would currently break LTO+KCFI kernel builds as the kernel has global functions that are not address-taken in C code, but still end up being indirect called because their addresses were taken in assembly code that wasn't visible to LTO (e.g. arm64's `alternative_cb` mechanism).


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https://reviews.llvm.org/D138337