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Move the dist-aarch64-linux CI job to an aarch64 runner instead of
cross-compiling it from an x86 one. This will make it possible to
perform optimisations such as LTO, PGO and BOLT later on.
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This reverts commit 023521e6825edfa6df01e392520d7cb120eab158, reversing
changes made to c434b4b4b6cd20560c5b32e80b2b22618a4da3dd.
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Move the dist-aarch64-linux CI job to an aarch64 runner instead of
cross-compiling it from an x86 one. This will make it possible to
perform optimisations such as LTO, PGO and BOLT later on.
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I'm proposing this GCC upgrade since it addresses bug #125619. The
regression in question affects stable release consumers who tend to have
no exposure to Rust build tools, so if at all possible, I would like to
have it resolved in the next stable release. I have tried to fix the bug
in `compiler-builtins`, which led to submitting a PR for `compiler-rt`
in upstream LLVM, but it may take a long time before these upstreams
address this regression.
A summary of why upgrading GCC solves the regression follows.
`__multc3()` is a builtin function `compiler-builtins` exposes for
specifically aarch64, non-Windows targets [1]. The object file for it is
included in `staticlib` archives through `libstd`. The implementation
for `__multc3()` is from `multc3.c`, part of LLVM's `compiler-rt`.
Upstream `compiler-rt` normally builds the C file using the Clang
from the same LLVM version. On the other hand, `compiler-builtins`
builds the C file using GCC, outside of the usual LLVM build system.
The upstream implementation doesn't have feature detection which
works for GCC version older than 10, and ends up producing an
unlinkable object.
Upstream LLVM might be slow to respond to this issue as they might deem
`compiler-builtin` as doing something out of the ordinary from their
perspective. They might reasonably assume everyone builds `compiler-rt`
through LLVM's build system.
I have done the following to test this change:
- verified that a local build without this patch exhibits the
regression.
- verified that with this patch, the object for `__multc3()` has no
reference to undefined functions in the symbol table.
- verified that with this patch, `rustc` is usable to build Ruby with
YJIT, and that the reported regression is resolved.
[1]: https://github.com/rust-lang/compiler-builtins/blob/c04eb9e1afb72bdf943f5e5d77b3812f40526602/build.rs#L524-L539
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This is implementing the MCP from rust-lang/compiler-team#493. It is
increasing the minimum requirements of a couple Tier 1 targets, and
others at lower tiers, so this should go through FCP sign-offs for both
`T-compiler` and `T-release`.
The new `linux-gnu` baseline is kernel 3.2 and glibc 2.17. We will also
take that kernel as the minimum floor for _all_ `*-linux-*` targets, so
it may be broadly assumed in the implementation of the standard library.
That does not preclude specific targets from having greater requirements
where it makes sense, like a new arch needing something newer, or a
platform like `linux-android` choosing a newer baseline.
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Crosstool-ng 1.22 used by those docker dist builds only allows one
mirror for all downloads.
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LLVM requires CMake 3.13.4, which is only available as of Ubuntu 20.04.
On images using an older version, build it manually.
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Promote aarch64-unknown-linux-gnu to Tier 1
This PR promotes the `aarch64-unknown-linux-gnu` target to Tier 1, as proposed by [RFC 2959]:
* The `aarch64-gnu` CI job is moved from `auto-fallible` to `auto`.
* The platform support documentation is updated, uplifting the target to Tiert 1 with a note about missing stack probes support.
* Building the documentation is enabled for the target, as we produce the `rust-docs` component for all Tier 1 platforms.
[RFC 2959]: https://github.com/rust-lang/rfcs/pull/2959
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We need to add runners designed for an aarch64 host system, and it'd be
nice to return an error message if someone tries to run an image
designed for an host architecture in another one.
To start the work on this, this commit moves all the existing builders
in the host-x86_64 directory, and changes the run.sh script to look up
the image in the correct directory based on the host architecture.
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