bootstrap.py --stage {1,2} --step doc-rustc fails

[TimNN]

bootstrap.py --stage {1,2} --step doc-rustc fails with:

'failed to copy `$PWD/build/x86_64-unknown-linux-gnu/stage1-test/x86_64-unknown-linux-gnu/doc/.stamp` to `$PWD/build/x86_64-unknown-linux-gnu/doc/.stamp`: No such file or directory (os error 2)', $RUST/src/bootstrap/build/util.rs:46

Note that there is no doc directory in $PWD/build/x86_64-unknown-linux-gnu/

Creating that directory fixes this problem but leads to another problem:

'fs::remove_dir_all(&out_dir) failed with No such file or directory (os error 2)', $RUST/src/bootstrap/build/doc.rs:183

This is because there is no doc directory in $PWD/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/, which the tool tries to lstat (checked with strace).

Creating that directory fixes the problem.

Note that for stage 2, all directories starting at stage2-rustc needed to be created.

[alexcrichton]

Oh dear yeah this isn't tested very well so I wouldn't be surprised if it breaks every now and then, thanks for the report!

[alexcrichton]

oops

[TimNN]

Yeah, I expected that (the not very well tested) so when I needed to build the compiler docs I decided to try using rust build by that.

By the way, I'm a little confused by the following:

The rustbuild configuration includes a build.compiler-docs key, which is also present in the Config struct as compiler_docs, however the field does not seem to be ever used.

[alexcrichton]

Oh there should probably be a line in step.rs which adds that target to a dependency of the docs target, probably just got lost along the way somewhere by accident :(