Note this isn't useful, yet. More changes will be necessary to be able to
actually codegen for this machine. As such, it is not enabled by default.

This patch is on its own for the benefit of the reviewers.

Shipping this tool gives people reliable way to reduce the generated executable size.

I'm not sure if this strip tool is available from the llvm version current rust is built on. But let's take a look. @japaric

…H of a module's HIR.

nll requires these annotations, I believe because of
rust-lang#29149

Tests should always use "rustc" and "cargo" from config.toml instead
of assuming that stage0 binaries was downloaded to build directory.

This ensure we do block the tools when they are broken during an update.

…i/..."

Previously, the --keep-stage argument would only function for compilers
that were depended on by future stages. For example, if trying to build
a stage 1 compiler you could --keep-stage 0 to avoid re-building the
stage 0 compiler. However, this is often not what users want in
practice.

The new implementation essentially skips builds all higher stages of the
compiler, so an argument of 1 to keep-stage will skip rebuilds of the
libraries, just linking them into the sysroot. This is unlikely to work
well in cases where metadata or similar changes have been made, but is
likely fine otherwise.

This change is somewhat untested, but since it shouldn't have any effect
except with --keep-stage, I don't see that as a large problem.

…ne, r=alexcrichton

Initialize LLVM's AMDGPU target machine, if available.

Note this isn't useful, yet. More changes will be necessary to be able to
actually codegen for this machine. As such, it is not enabled by default.

This patch is on its own for the benefit of the reviewers.

Add read_exact_at and write_all_at methods to FileExt on unix

This PR adds `FileExt::read_exact_at()` and `FileExt::write_all_at()`, which are to `read_at()` and `write_at()` as `read_exact()` and `write_all()` are to `read()` and `write()`. This allows the user to not have to deal with `ErrorKind::Interrupted` and calling the functions in a loop.

I was unsure as to how to mark these new methods so I marked them `unstable`, please let me know if I should have done it differently.

I asked in Discord and was told that as this change is small it does not require an RFC.

…reemap-annotations, r=gankro

add outlives annotations to `BTreeMap`

NLL requires these annotations, I believe because of <rust-lang#29149>.

Fixes rust-lang#48224

r? @gankro
cc @lqd

Show known meta items in unknown meta items error

This PR adds a label to E0541. It also factors built-in attribute parsing into a submodule of `attr` for ease of future refactoring.

Fixes rust-lang#51469.

Provide llvm-strip in llvm-tools component

Shipping this tool gives people reliable way to reduce the generated executable size.

I'm not sure if this strip tool is available from the llvm version current rust is built on. But let's take a look. @japaric

Make Stdio handle UnwindSafe

Closes  rust-lang#51863

This is my first compiler PR. Thanks Niko for the mentor help!

r? @nikomatsakis

…tage0, r=simulacrum

bootstrap: tests should use rustc from config.toml

Tests should always use "rustc" and "cargo" from config.toml instead of assuming that stage0 binaries was downloaded to build directory.

Without this change `./x.py test src/bootstrap` will always try to use `build/ARCH/stage0/bin/rustc` file as compiler, but when we use local compiler to bootstrap this file does not exist.

Do not suggest changes to str literal if it isn't one

Fix rust-lang#48364.

…atsakis

Get rid of `TyImplTraitExistential`

cc @eddyb

r? @nikomatsakis

Emit column info in debuginfo for non msvc like targets

Fixes rust-lang#42921 everywhere except MSVC. This mimics clang behaviour.

…rly, r=nikomatsakis

incr.comp.: Take names of children into account when computing the ICH of a module's HIR.

Fixes rust-lang#40876. Red-green tracking does not make this a problem anymore. We should verify this via a perf-run though.

r? @nikomatsakis

add entry for cargo-metadata feature to RELEASES

…ulacrum

toolstate: Fixed detection of changed submodule, and other fixes.

1. Make sure that if a submodule is updated but failed to test-pass, we'll block the merge.
2. Make sure failure on external docs (nomicon/RBE/etc) are properly checked.
3. If the commit message starts with "Update RLS" (or clippy etc), automatically run the "tools" job on the PR, so that we could know if the update failed before merging.

…lexcrichton

 Change --keep-stage to apply more often

Previously, the --keep-stage argument would only function for compilers
that were depended on by future stages. For example, if trying to build
a stage 1 compiler you could --keep-stage 0 to avoid re-building the
stage 0 compiler. However, this is often not what users want in
practice.

The new implementation essentially skips builds all higher stages of the
compiler, so an argument of 1 to keep-stage will skip rebuilds of the
libraries, just linking them into the sysroot. This is unlikely to work
well in cases where metadata or similar changes have been made, but is
likely fine otherwise.

This change is somewhat untested, but since it shouldn't have any effect
except with --keep-stage, I don't see that as a large problem.

r? @alexcrichton
cc @nikomatsakis - I believe you wanted this functionality