[Bug 1891460] Re: Add riscv64 to cross-targets

[Dimitri John Ledkov]

linux is in updates that have matching libc headers across all
architectures as needed for cross building linux 5.4.0-47.51

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Title:
  Add riscv64 to cross-targets

Status in build-essential package in Ubuntu:
  Fix Released
Status in build-essential source package in Focal:
  Fix Committed
Status in build-essential source package in Groovy:
  Fix Released

Bug description:
  [Impact]

   * Unable to create cross-building chroot to cross-compile Ubuntu
  source packages for riscv64

  [Test Case]

   * Create a cross-building chroot, and attempt to cross build packages

   mk-sbuild --target riscv64 focal
   sbuild -d focal --host riscv64 hello_2.10-2ubuntu2

    Should produce riscv64 debs, like it does in groovy

  [Regression Potential]

   * Introducing new cross packages to riscv64 only affects cross-building to riscv64 and no other native/cross builds.
   * Rebuild of build-essential will trigger a few autopkgtests

  [Other Info]

   * During publication ensure that debs go into the right component!
  Specifically into universe like seen on
  https://launchpad.net/ubuntu/groovy/amd64/crossbuild-essential-
  riscv64/12.8ubuntu3

   * Fixed in groovy already, may require linux kernel from proposed
  (with correct matching headers across all architectures)

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