Commits on Aug 27, 2024

1. psm: allow manual opt out of #cfg[link("psm_s")] …

   Currenty, when using the `asm` configuration, the `lib.rs` file will manually
   add a `link("psm_s")` attribute to the build causing a flag like `-lpsm_s`
   to appear on the link line. `psm_s` is the library of assembly code, built by
   `build.rs` in Cargo projects.
   
   However, when using Cargo packages with build systems like Buck2, we have to
   manually replace the `build.rs` script, and build the bits of C/assembly code
   that come with `psm` and `stacker` as a separate build item (an actual library),
   then link them into the Rust libraries.
   
   The name of the library often can't be easily made identical to `psm_s` as
   desired by the `link()` call, meaning that just blindly compiling this crate
   causes an inevitable linking failure. But we're building the code and explicitly
   linking the library anyway, removing the need for this `#[link]` clause.
   
   Therefore, introduce a new `link_asm` cfg option to give "expert" users the
   ability to link in code manually. This is always enabled by the Cargo build for
   `asm`-compatible targets, but Buck users can leave it off.
   
   Signed-off-by: Austin Seipp <aseipp@pobox.com>

   

   thoughtpolice committed Aug 27, 2024
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