Add integer atomic types
Tracking issue: #32976
RFC: rust-lang/rfcs#1543
The changes to AtomicBool in the RFC are not included, they are in a separate PR (#32365).
This commit is an implementation of [RFC 1513] which allows applications to
alter the behavior of panics at compile time. A new compiler flag, `-C panic`,
is added and accepts the values `unwind` or `panic`, with the default being
`unwind`. This model affects how code is generated for the local crate, skipping
generation of landing pads with `-C panic=abort`.
[RFC 1513]: https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md
Panic implementations are then provided by crates tagged with
`#![panic_runtime]` and lazily required by crates with
`#![needs_panic_runtime]`. The panic strategy (`-C panic` value) of the panic
runtime must match the final product, and if the panic strategy is not `abort`
then the entire DAG must have the same panic strategy.
With the `-C panic=abort` strategy, users can expect a stable method to disable
generation of landing pads, improving optimization in niche scenarios,
decreasing compile time, and decreasing output binary size. With the `-C
panic=unwind` strategy users can expect the existing ability to isolate failure
in Rust code from the outside world.
Organizationally, this commit dismantles the `sys_common::unwind` module in
favor of some bits moving part of it to `libpanic_unwind` and the rest into the
`panicking` module in libstd. The custom panic runtime support is pretty similar
to the custom allocator support with the only major difference being how the
panic runtime is injected (takes the `-C panic` flag into account).
In `impl<T> Trait for T`, the blanket type parameters `T` were
recognized as "local" and "not exported", so these impls were
thrown out.
Now we check if they are generic, and keep them in that case.
Fixes: #29503
trans: callee: normalize trait_ref before use
This fixes#33436 and #33461. Ran the tests and nothing else seems to be affected.
P.S. How to write the regression test for this fix? Does this qualify as run-pass or run-make, as the test only needs to be successfully compiled to be considered passed? Will add the testcase (the minimal example in #33461 seems fit) after clarifying this.
rustbuild: Document many more parts of the build
This commit expands the bootstrap build system's `README.md` as well as ensuring
that all API documentation is present and up-to-date. Additionally a new
`config.toml.example` file is checked in with commented out versions of all
possible configuration values.
Get a file during bootstrap to a temp location first.
When downloading a file in the bootstrap phase - get it to a temp
location first. Verify it there and only if downloaded properly move it
to the `cache` directory.
This should prevent `make` being stuck if the download was interrupted
or otherwise corrupted, as per discussion in #32834
The temporary files are deleted in case of an exception.
I was looking for some unit/integration tests around this and couldn't find any - presumably because this is being tested by just Travis launching it ? Let me know if it would be good to try to write tests around this. Thanks !
Add armv7-linux-androideabi target
This PR adds `armv7-linux-androideabi` target that matches `armeabi-v7a` Android ABI, ~~downscales `arm-linux-androideabi` target to match `armeabi` Android ABI~~ (TBD later if needed).
This should allow us to get the best performance from every [Android ABI level](http://developer.android.com/ndk/guides/abis.html).
Currently existing target `arm-linux-androideabi` started gaining features out of the supported range of [android `armeabi`](http://developer.android.com/ndk/guides/abis.html). While android compiler does not use a different target for later supported `armv7` architecture, it has distinct ABI name `armeabi-v7a`. We decided to add rust target `armv7-linux-androideabi` to match it.
Note that `NEON`, `VFPv3-D32`, and `ThumbEE` instruction sets are not added, because not all android devices are guaranteed to support all or some of these, and [their availability should be checked at runtime](http://developer.android.com/ndk/guides/abis.html#v7a).
~~This reduces performance of existing `arm-linux-androideabi` and may make it _much_ slower (we are talking more than order of magnitude in some random ad-hoc fp benchmark that I did).~~
Part of #33278.
make dist: specify the archive file as stdout
If the `-f` option isn't given, GNU tar will use environment variable
`TAPE` first, and next use the compiled-in default, which isn't
necessary `stdout` (it is the tape device `/dev/rst0` under OpenBSD for
example).
implement RFC 1521
Adds documentation to Clone, specifying that Copy types should have a trivial Clone impl.
Fixes#33416.
I tried to use "should" and "must" as defined [here](https://tools.ietf.org/html/rfc2119).
cc @ubsan
Improve diagnostics for constants being used in irrefutable patterns
It's pretty confusing and this error triggers in resolve only when "shadowing" a const, so let's make that clearer.
r? @steveklabnik
rustdoc: use btree map for where clauses
to get more reproducible output.
Fixes: #32555
I've looked at the other uses of HashMap in rustdoc, and they seem ok to (i.e. they use `iter()` and related only for constructing a new map, or when the output goes into independent files).
Not sure what the cause of #24473 is, it shouldn't be where clauses, but maybe it was also fixed inbetween since May 2015.
degrade gracefully with empty spans
In https://github.com/rust-lang/rust/pull/32756, we solved the final test failure, but digging more into it the handling of that scenario could be better. The error was caused by an empty span supplied by the parser representing EOF. This patch checks that we cope more gracefully with such spans:
r? @jonathandturner
rustc: Change target_env for ARM targets to `gnu`
Right now they're `gnueabihf` and `gnueabi`, but when adding new platforms like
musl on ARM it's unfortunate to have to test for all three (`musl`, `musleabi`,
and `musleabihf`). This PR switches everything currently to `gnu`, and the new
musl targets can also use `musl` when they land.
Closes#33244
