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The original reproducibility fix was problematic for a couple reasons: - disabling both lto and parallel builds had an unfortunate effect of nearly doubling rust-native and rust build times (which are slow to begin with). Disabling lto hurts runtime performance too. - both of these things were done for the *entire build*, while the only problematic item is the librustdoc crate. - lto=off option in config.toml has an effect only on building rustc (the compiler itself), and doesn't help with rustdoc reproducibility. Actual fix is the codegen-units setting, which indirectly disables lto via giving llvm only one unit to work with at a time. After some digging, here's a more targeted fix for the problem. Why librustdoc is non-reproducible, but not anything else remains a mystery, hidden deep in rust-llvm's lto optimization code. (From OE-Core rev: a1977407a88a2004c3a6d2dba1d5bfe1aa1664b2) Signed-off-by: Alexander Kanavin <alex@linutronix.de> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>