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

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Matthieu Clemenceau (mclemenceau):

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).

** Affects: gcc-10 (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: gcc-10 (Ubuntu Bionic)
     Importance: High
         Status: Triaged


** Tags: fr-4062
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gcc-10 backport to bionic needed for grub2
https://bugs.launchpad.net/bugs/2015801
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