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

[Nathan Teodosio]

The build with the manual removal of the -Z flags failed[1] with
multiple undefined references such as

--->
obj/third_party/rust/cxx/v1/lib/libcxx_lib.rlib(libcxx_lib.cxx.fbfe687f763ab24e-cgu.0.rcgu.o):cxx.fbfe687f763ab24e-cgu.0:function <&T as core::fmt::Debug>::fmt: error: undefined reference to '<str as core::fmt::Debug>::fmt'
obj/third_party/rust/cxx/v1/lib/libcxx_lib.rlib(libcxx_lib.cxx.fbfe687f763ab24e-cgu.0.rcgu.o):cxx.fbfe687f763ab24e-cgu.0:function <&T as core::fmt::Display>::fmt: error: undefined reference to '<str as core::fmt::Display>::fmt'
obj/third_party/rust/cxx/v1/lib/libcxx_lib.rlib(libcxx_lib.cxx.fbfe687f763ab24e-cgu.0.rcgu.o):cxx.fbfe687f763ab24e-cgu.0:function <&T as core::fmt::LowerHex>::fmt: error: undefined reference to 'core::fmt::num::<impl core::fmt::LowerHex for u8>::fmt'
<---

The builds with RUSTC_BOOTSTRAP=1 were silently reset after hours of
progress (an old mysterious bug) and therefore we'll find out their
actual result only on Monday.

[1]
https://launchpadlibrarian.net/710066046/buildlog_snap_ubuntu_jammy_armhf_chromium-
rust_BUILDING.txt.gz

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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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