nikic added a comment. @arsenm If the `null-pointer-is-valid` attribute is moved into the data layout, I'm wondering how Clang's `-fno-delete-null-pointer-checks` option would work or what it would be replaced with. In Rust it is possible to define a custom target, which also defines a custom data-layout, though I think that also needs to be compatible with the base target. I couldn't find any information on how to use a custom data layout in Clang. As such, I suspect that to preserve existing functionality we'd need support //both// for specifying this per-addrspace in the DL and as a function attribute.
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