[Bug 2049493] Re: Newer rustc version needed in jammy to build chromium updates

[Zixing Liu]

> Actually that had failed on the 32-bit ARMv7. ARMv8 had failed because
of connection and I didn't care to trigger it again so I assumed it
would fail for the same reason.

I think it's very difficult to locate the issue, given this log.
The issue looks like two  Rust toolchains of different versions were used to compile Chromium/v8.

I suggest building the Chromium using `ninja -v` to see the command line
used to invoke the compiler.

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https://bugs.launchpad.net/bugs/2049493

Title:
  Newer rustc version needed in jammy to build chromium updates

Status in chromium-browser package in Ubuntu:
  New
Status in rustc package in Ubuntu:
  New

Bug description:
  The next chromium version is making rustc mandatory to build. Chromium
  is a snap built from core22 so using the jammy packages, the build is
  currently failing because it needs libprofiler_builtins.rlib which
  isn't available.

  Upstream provides toolchain builds that can be used but only for amd64 so currently the snap is failing to build on arm
  https://launchpad.net/~chromium-team/+snap/chromium-snap-from-source-beta

  The version upstream is using is 1.75 but it's possible that a lower
  version would be enough for now if libprofiler was enabled

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