Use identity operator `is` when comparing to None
This is very minor, but idiomatic Python code uses `is` for comparisons to `None`. This is because semantically we want to compare to the "identity" of `None`, not its value.
See [PEP8 for details](https://www.python.org/dev/peps/pep-0008/#programming-recommendations).
Fix variable name reference
As best I can tell, this was a typo due to how similar it looks to the function above it. PyCharm found this as a unbound local variable.
Add aarch64-unknown-linux-musl target
This adds support for the aarch64-unknown-linux-musl target in the build and CI systems.
This addresses half of issue #42520.
The new file `aarch64_unknown_linux_musl.rs` is a copy of `aarch64_unknown_linux_gnu.rs` with "gnu" replaced by "musl", and the added logic in `build-arm-musl.sh` is similarly a near-copy of the arches around it, so overall the changes were straightforward.
Testing:
```
$ sudo ./src/ci/docker/run.sh cross
...
Dist std stage2 (x86_64-unknown-linux-gnu -> aarch64-unknown-linux-musl)
Building stage2 test artifacts (x86_64-unknown-linux-gnu -> aarch64-unknown-linux-musl)
Compiling getopts v0.2.14
Compiling term v0.0.0 (file:///checkout/src/libterm)
Compiling test v0.0.0 (file:///checkout/src/libtest)
Finished release [optimized] target(s) in 16.91 secs
Copying stage2 test from stage2 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / aarch64-unknown-linux-musl)
...
Build completed successfully in 0:55:22
```
```
$ rustup toolchain link local obj/build/x86_64-unknown-linux-gnu/stage2
$ rustup default local
```
After setting the local toolchain as default, and adding this in ~/.cargo/config:
```
[target.aarch64-unknown-linux-musl]
linker = "aarch64-linux-musl-gcc"
```
...then the toolchain was able to build a working ripgrep as a test:
```
$ readelf -a target/aarch64-unknown-linux-musl/debug/rg | grep -i interpreter
$ readelf -a target/aarch64-unknown-linux-musl/debug/rg | grep NEEDED
$ file target/aarch64-unknown-linux-musl/debug/rg
target/aarch64-unknown-linux-musl/debug/rg: ELF 64-bit LSB executable, ARM aarch64, version 1 (GNU/Linux), statically linked, BuildID[sha1]=be11036b0988fac5dccc9f6487eb780b05186582, not stripped
```
Allow writing metadata without llvm
# Todo:
* [x] Rebase
* [x] Fix eventual errors
* [x] <strike>Find some crate to write elf files</strike> (will do it later)
Cc #43842
* Adjust bootstrap to provide useful output on failure
* Add missing package dependencies in the build environment
* Fix permission bits on prebuilt toolchain files
If config.toml doesn't exist, then an IOError will be raised
on the `with open(...)` line. Prior to e788fa7, this was
caught because the `except` clause didn't specify what
exceptions it caught, so both IOError and OSError were
caught
Run the miri test suite on the aux builder and travis
Reopen of #38350
see https://github.com/rust-lang/rust/pull/43340#issuecomment-316940762 for earlier discussion
Rationale for running miri's test suite in rustc's CI is that miri currently contains many features that we want in const eval in the future, and these features would break if the test suite is not run.
fixes#44077
r? @nikomatsakis
cc @eddyb
rustbuild: Don't pass `-j` if called by `make`
In these situations Cargo just prints out a warning about ignoring the flag
anyway, so let `make` take care of jobs and whatnot instead of getting warnings
printed.
In these situations Cargo just prints out a warning about ignoring the flag
anyway, so let `make` take care of jobs and whatnot instead of getting warnings
printed.
ci: Upload/download from a new S3 bucket
Moving buckets from us-east-1 to us-west-1 because us-west-1 is where
rust-central-station itself runs and in general is where we have all our other
buckets.
