[llvm-branch-commits] [clang] [llvm] Backport "riscv-isa" module metadata to 18.x (PR #91514)

[Paul Kirth via llvm-branch-commits]

ilovepi wrote:

This tends to bite anyone using LTO with RISCV. In particular I’m concerned about the impact on Rust, since they’ll pin LLVM until  the LLVM 19 release. About 60% of Fuchsia is implemented in rust. More if you count only count userland. 

We’re hoping to avoid a situation where we can’t use LTO on RISCV Fuchsia targets, as we’re starting to rely more on LTO configurations, to enable features like control flow integrity. 

https://github.com/llvm/llvm-project/pull/91514