c64d9af7b5
While the functionality of this flag is obvious in the implementation, tool users may not know what it does with the short description provided. Notably, it is not obvious from the short description that: * Functions provided will be converted to internal linkage (and thus discarded if unused) even if unreferenced. * Functions in the first file will not be internalized, even if referenced by a later one. The Rust for Linux project has [found use for this flag](https://lore.kernel.org/all/20251202-inline-helpers-v1-0-879dae33a66a@google.com/) to support inlining `static inline` functions in C into code compiled by Rust when `rustc` and `clang` share a LLVM.