Upgrade Rust to 1.66.1

[Zixing Liu]

We need to upgrade Rust to 1.66.1 to receive new language features and also help the desktop team to track the newer version of Firefox.

[Zixing Liu (liushuyu-011)]

Preliminary packages are prepared at https://launchpad.net/~liushuyu-011/+archive/ubuntu/rust-updates/+packages.

This update also contains required additions for profiling/sampling/coverage support (see https://bugs.launchpad.net/ubuntu/+source/rustc/+bug/2002694)

[Simon Chopin (schopin)]

I'd have expected the matching sources to be at https://git.launchpad.net/~canonical-foundations/ubuntu/+source/rustc/log/?h=merge-1.66 but the version there doesn't match the one in the PPA.

Please clarify the situation?

[Zixing Liu (liushuyu-011)]

There were some issues with how Launchpad PPA works. So I have prepared the new packages in https://launchpad.net/~liushuyu-011/+archive/ubuntu/rust-updates-1/+packages now.

[Zixing Liu (liushuyu-011)]

Fixed packages are now in https://launchpad.net/~liushuyu-011/+archive/ubuntu/rust-updates-1.66

[Simon Chopin (schopin)]

Looks good, just 2 issues:

* Lintian complains about missing copyright info regarding some newly-vendored crates
* (small nitpick) in the changelog, the profiler item should be its own entry, as it's not related to the new upstream release :)

[Simon Chopin (schopin)]

Due to the feature freeze looming, I fixed the issues and uploaded directly.

[Zixing Liu (liushuyu-011)]

[Backport]

The backport status for Bionic (18.04), Focal (20.04), Jammy (22.04), and Kinetic (22.10):

Bionic: https://git.launchpad.net/~canonical-foundations/ubuntu/+source/rustc/log/?h=bionic-1.66
Focal: https://git.launchpad.net/~canonical-foundations/ubuntu/+source/rustc/log/?h=focal-1.66
Jammy: https://git.launchpad.net/~canonical-foundations/ubuntu/+source/rustc/log/?h=jammy-1.66
Kinetic: https://git.launchpad.net/~canonical-foundations/ubuntu/+source/rustc/log/?h=kinetic-1.66

Notable differences from the mainline edition (Lunar):

* [Kinetic and Bionic only] Bundled LLVM 15.0.7 C/C++ sources
* [Except Kinetic] Removed dh-cargo requirements
* [Bionic only] Disabled outline LSE assembly helper requirements on aarch64

Known Issues:

* LLVM version on JJ and KK currently contains a bug that affects ppc64el where LLVM will encounter an address boundary error (segmentation fault) during bytecode emission. Upgrading the system LLVM to 15.0.7 is pending.
* Due to aging GCC runtimes in 18.04, out-of-line LSE helpers are unsupported on aarch64, while Rust requires this target feature to be enabled. A patch has been added to address this situation. As a result, all the LSE intrinsic functions will be emitted inline instead—impact: slightly worse atomic operation performance and larger binary size.

PPA preparation:

https://launchpad.net/~liushuyu-011/+archive/ubuntu/rust-updates-1.66/+packages

* Note:
Focal was uploaded as EVR 1.66.1+dfsg0ubuntu1~llvm2-0ubuntu0.20.04 in the PPA.
Bionic was uploaded as EVR 1.66.1+dfsg0ubuntu1~llvm2-0ubuntu0.18.04.5 in the PPA.
... despite the EVR should be 1.66.1+dfsg0ubuntu1~llvm-0ubuntu0.20.04 and 1.66.1+dfsg0ubuntu1~llvm-0ubuntu0.18.04, respectively.

[Zixing Liu (liushuyu-011)]

Update:
An SRU request has been filed for LLVM 15 upgrade in KK and JJ:
https://bugs.launchpad.net/ubuntu/+source/llvm-toolchain-15/+bug/2008755.

[Launchpad Janitor (janitor)]

This bug was fixed in the package rustc - 1.67.1+dfsg0ubuntu1-0ubuntu2

---------------
rustc (1.67.1+dfsg0ubuntu1-0ubuntu2) lunar; urgency=medium

  * Fix an issue where rustc can not find the standard library
    - d/p/ubuntu-fix-sysroot-detection.patch: Fix sysroot detection
      logic so that rustc will find the correct library paths to
      search in.

rustc (1.67.1+dfsg0ubuntu1-0ubuntu1) lunar; urgency=medium

  * New upstream release 1.67.1 (LP: #2007642)
    - d/p/d-bootstrap-use-local-css.patch: Remove unnecessary hunks
    - d/p/ubuntu-disable-sse2-tests-on-i386.patch: Disable SSE2 tests
      on i386 builds
    - d/copyright: Update copyright information for new dependencies
      and also remove copyright data for deleted dependencies
    - d/patches: Refresh patches
    - d/control: Update vendored deps field
    - d/control: Refresh vendored dependencies list
    - d/source/lintian-overrides: add new test files to the list

rustc (1.66.1+dfsg0ubuntu1-0ubuntu1) lunar; urgency=medium

  * New upstream release 1.66.1 (LP: #2005122)
    - d/control: Switch to LLVM 15 for better optimizations
    - d/rules: Add workarounds for the new bootstrap tests
    - d/patches: Refresh patches to adapt to the new upstream changes
    - d/p/ubuntu-Revert-Use-constant-eval-to-do-strict-validity-check.patch:
      Dropped, no longer needed
    - d/copyright: refresh vendored crate license info
    - d/libstd-rust-1.66.lintian-overrides: update the override files
  * d/rules: Enable LLVM profiler support (LP: #2002694)

 -- Zixing Liu <email address hidden> Wed, 22 Feb 2023 21:38:58 -0700