Cannot build compiler docs

[mcarton]

It seems that building compiler docs is broken, in a fresh clone with:

% diff config.toml src/bootstrap/config.toml.example
106c106
< compiler-docs = true
---
> #compiler-docs = false

./x.py doc -j8 fails with:

error: requires `freeze` lang_item

error: Could not document `libc`.
Build failed, waiting for other jobs to finish...
error: build failed


command did not execute successfully: "/home/martin/programs/rust/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "doc" "-j" "8" "--target" "x86_64-unknown-linux-gnu" "--release" "--manifest-path" "/home/martin/programs/rust/src/libstd/Cargo.toml" "--features" "panic-unwind jemalloc backtrace"
expected success, got: exit code: 101


failed to run: /home/martin/programs/rust/build/bootstrap/debug/bootstrap doc -j8
Build completed unsuccessfully in 0:45:19

[ollie27]

rust-lang/libc@c0cf280 seems very relevant. I guess the libc submodule needs to be updated.