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2707cd670c
cg_llvm: Clean up FFI calls for setting module flags This is a combination of several inter-related changes to how module flags are set: - Remove some unnecessary code for setting an `"LTOPostLink"` flag, which has been obsolete since LLVM 17. - Define our own enum instead of relying on enum values defined by LLVM's unstable C++ API. - Use safe wrapper functions to set module flags, instead of direct `unsafe` calls. - Consistently pass pointer/length strings instead of C strings. - Remove or shrink some `unsafe` blocks.
This directory currently contains some LLVM support code. This will generally be sent upstream to LLVM in time; for now it lives here. NOTE: the LLVM C++ ABI is subject to between-version breakage and must *never* be exposed to Rust. To allow for easy auditing of that, all Rust-exposed types must be typedef-ed as "LLVMXyz", or "LLVMRustXyz" if they were defined here. Functions that return a failure status and leave the error in the LLVM last error should return an LLVMRustResult rather than an int or anything to avoid confusion. When translating enums, add a single `Other` variant as the first one to allow for new variants to be added. It should abort when used as an input. All other types must not be typedef-ed as such.