When building a proc_macro, rust-analyzer recompiles every dependencies

rust-analyzer version: v0.3.1958

rustc version: rustc 1.76.0 (07dca489a 2024-02-04)

editor or extension: v0.3.1958

Hello,

When I develop parts of my project that aren't a proc-macro, when the file is auto-saved, the checks that rust-analyzer do are very fast.

But when I am working on my proc macro, at every change of my file (auto-save enabled), I am seeing every dependencies getting recompiled which makes the editor slow at every change.

Is there a way for me to fix that? (Like changing some cargo check flags) Or is it the special nature of proc-macro that forces the recompilation of all of the dependencies at each save?

Reproduce the slow auto-save checks while editing a proc-macro using rust-analyzer v0.3.1958 and rustc 1.76.0, then compare them with checks for a non-proc-macro file. Start by determining whether Cargo or rust-analyzer is triggering dependency recompilation; done means identifying an actionable configuration or behavior change, or documenting that recompilation is expected.