Commit 24e2f4e
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docs: record the fast-path graph-identity gap as a follow-up
The fast path replays build.ninja on the premise that this request would generate
the same graph. This PR pins two axes (profile, cache mode) into .build_cache, but
MACOSX_DEPLOYMENT_TARGET, MCPP_VERIFY_MODGRAPH and MCPP_SCANNER also change the
graph and are recorded nowhere — all three predate this PR, and closing them needs
a cheap graph identity rather than re-deriving the fingerprint, which is exactly
what the fast path exists to avoid. Written down instead of half-fixed.1 parent 9d21773 commit 24e2f4e
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