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

[Steve Langasek]

On Tue, Apr 11, 2023 at 08:29:37PM -0000, Julian Andres Klode wrote:
> Regarding the move to GCC 12, it's simply because gcc-10 is in the
> process of being dropped (at the very least in Debian), and at least
> Debian dropped the versioned dependency, so following that, we'd start
> building with GCC 12.

That is not an argument for also having to do the work to provide a newer
gcc in focal.

grub2-unsigned in Debian should thus build-depend on gcc (>= 10) | gcc-10 so
that the build-deps are satisfied in each series; and then we need to sort
out gcc-10 for bionic.

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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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