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

[Matthias Klose]

if gcc-10 is packaged, it should be in the form of the gcc-snapshot or
gcc-mozilla package. We don't want to have newer versions of the
packages for all the runtime libraries. grub then should be built with
-static-libgcc and -static-libstdc++ options.

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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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