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Document -Zcache-proc-macros #151227

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9 changes: 9 additions & 0 deletions src/doc/unstable-book/src/compiler-flags/cache-proc-macros.md
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## `cache-proc-macros`

The tracking issue for this feature is: [#151364]

[#151364]: https://github.com/rust-lang/rust/issues/151364

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This option instructs `rustc` to cache (derive) proc-macro invocations using the incremental system. Note that the compiler does not currently check whether the proc-macro is actually "cacheable" or not. If you use this flag when compiling a crate that uses non-pure proc-macros, it can result in stale expansions being compiled.
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@jackh726 jackh726 Jan 23, 2026

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Note that the compiler does not currently check whether the proc-macro is actually "cacheable" or not.

Oh I sure hope we issue some loud warnings about potential unsoundness XD

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