[Bug 1926291] Re: backport the final GCC 11.1.0 release to 21.04

[Matthias Klose]

the failed autopkg tests succeeded with retries.  The packages look
good, and install ok. Until now, I didn't see any bug reports filed as
well.


** Tags removed: verification-needed verification-needed-hirsute
** Tags added: verification-done verification-done-hirsute

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Title:
  backport the final GCC 11.1.0 release to 21.04

Status in gcc-11 package in Ubuntu:
  New
Status in gcc-11-cross package in Ubuntu:
  New
Status in gcc-11-cross-ports package in Ubuntu:
  New
Status in gcc-11 source package in Hirsute:
  Fix Committed
Status in gcc-11-cross source package in Hirsute:
  Fix Committed
Status in gcc-11-cross-ports source package in Hirsute:
  Fix Committed

Bug description:
  backport the final GCC 11.1.0 release to 21.04. hirsute currently
  ships with a GCC 11 snapshot taken three days before the first GCC 11
  release candidate. The package is built in impish without problems.

  Regression potential: GCC 11 is not used by default for package
  builds, so packages are not affected by compiler issues.  Some GCC
  runtime libraries used by gcc-10 are shipped from gcc-11, so they are
  rebuilt too, including

   - libgcc-s1
   - libstdc++6
   - sanitizer libraries
   - libgfortran5
   - libobjc4
   - libatomic1
   - libquadmath1

  No changes were for these libraries, and I checked that the libstdc++6
  changes don't add or remove any symbols.

  libasan gets also enabled for riscv64, including a new cross package
  libasan6-riscv64-cross.

  The binaries for the SRU are built for hirsute with only the security
  pocket enabled. So these are safe to copy to the security pocket as
  well.

  The builds look ok, so as the other acceptance criteria, check for
  succeeding autopkg tests.

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