[Bug 2015801] Re: gcc-10 backport to bionic needed for grub2

[Steve Langasek]

I recall there being some reason why we cared about building grub with a
newer toolchain, either because the newer toolchain is needed to have
not-buggy output or because it is needed for grub to not drop features.
But I don't know the details, so I've added Julian to the bug to provide
that information.

** Changed in: gcc-10 (Ubuntu)
       Status: New => Invalid

** Also affects: gcc-10 (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: gcc-10 (Ubuntu Bionic)
       Status: New => Triaged

** Changed in: gcc-10 (Ubuntu Bionic)
   Importance: Undecided => High

** Tags added: fr-4062

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Title:
  gcc-10 backport to bionic needed for grub2

Status in gcc-10 package in Ubuntu:
  Invalid
Status in gcc-10 source package in Bionic:
  Triaged

Bug description:
  grub2-unsigned is now being binary-copied from kinetic back to all
  stable series, in order to avoid re-signing the UEFI binaries multiple
  times for the same code changes.

  Current grub2-unsigned build-depends on gcc-10.  This package does not
  exist in bionic - but because the binaries were copied from a later
  series, this was not a build failure that blocked the grub2-unsigned
  binaries being published in bionic.

  Nevertheless, we require that all packages be rebuildable from source
  using build-dependencies *within* the given series.  So this is a bug
  that needs to be addressed.

  There are two options: either we publish a separate source version of
  grub2-unsigned for bionic that rolls back the build-dependency on
  gcc-10; or, we publish gcc-10 to bionic as a non-default compiler that
  doesn't take over any of the binary packages from gcc-9 in that series
  (notably: libgcc).

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