[Bug 1848319] Re: update toolchain packages for bionic

[Terry Rudd]

The Canonical kernel team has completed the test-builds of bionic 4.15
and 5.3 kernels with gcc 7.5 and successfully smoke tested them for all
supported arches

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https://bugs.launchpad.net/bugs/1848319

Title:
  update toolchain packages for bionic

Status in gcc-7 package in Ubuntu:
  Fix Released
Status in gcc-7-cross package in Ubuntu:
  New
Status in gcc-7-cross-ports package in Ubuntu:
  New
Status in gcc-8 package in Ubuntu:
  Fix Released
Status in gcc-7 source package in Bionic:
  Fix Committed
Status in gcc-7-cross source package in Bionic:
  Fix Committed
Status in gcc-7-cross-ports source package in Bionic:
  Fix Committed
Status in gcc-8 source package in Bionic:
  Fix Committed
Status in gcc-7 source package in Eoan:
  Fix Committed
Status in gcc-7-cross source package in Eoan:
  New
Status in gcc-7-cross-ports source package in Eoan:
  New
Status in gcc-8 source package in Eoan:
  Fix Committed

Bug description:
  This is a follow-up to LP: #1814369. I'd like to update the toolchain
  packages in bionic, to the state which we have in the eoan release in
  October 2019 (gcc-7), and in focal (gcc-8).

   - gcc-8, update to the gcc-8.3 branch
   - gcc-7, updates to the gcc-7.5.0 release
   - corresponding gcc-cross packages

  The package builds are prepared in
  https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/ppa/+packages

  [Impact]
  Provide an upstream release for GCC 7.5, and update GCC 8 to the 8.3
  branch

  [Regression Potential]
  There is regression potential, however with a test rebuild of the main portion of the archive no regressions were found.

  [Test Case]
  No regressions in the GCC test suite, and no regressions in the test
  rebuild of the main component of the archive (all architectures)

  As a test, a complete archive rebuild was performed, and no
  regressions were found with this new package. The archive rebuild also
  contained updated versions of gcc-7, gcc-8, python-stdlib-extensions
  and python2.7. The GCC and Python packages should not infer with each
  other.

  [Validation]
  Analyze the build logs for regressions.
  For the cross builds, just make sure that the packages build using
  the updated sources.

  Summary of the test rebuilds:
  https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20191107-bionic-bionic.html
  https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20191107-bionic-gcc7-bionic.html

  The first one is a reference build, the second one the test rebuild
  with the updated components.

  There are no additional regressions except for one Python test, which sometimes hangs on the buildds, sometimes passes (test_ttk_guionly). Will
  be disabled in a follow-up upload.

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