[Bug 1964260] Please test proposed package

[Łukasz Zemczak]

Hello Corey, or anyone else affected,

Accepted gcc-9 into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/gcc-9/9.4.0-1ubuntu1~20.04.1 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: gcc-9-cross (Ubuntu Focal)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1964260

Title:
  SRU: Fix mismatched extern "C" block for aarch64

Status in gcc:
  Fix Released
Status in gcc-9 package in Ubuntu:
  Fix Released
Status in gcc-9-cross package in Ubuntu:
  Fix Released
Status in gcc-9 source package in Focal:
  Fix Committed
Status in gcc-9-cross source package in Focal:
  Fix Committed
Status in gcc-9 source package in Impish:
  Fix Committed
Status in gcc-9-cross source package in Impish:
  Fix Committed
Status in gcc-9 source package in Jammy:
  Fix Released
Status in gcc-9-cross source package in Jammy:
  Fix Released

Bug description:
  [ Description ]
  Compile on focal fails with:

  /<<PKGBUILDDIR>>/src/rocksdb/util/crc32c.cc:363:1: error: template with C linkage
    363 | template<void (*CRC32)(uint64_t*, uint8_t const**)>
        | ^~~~~~~~
  In file included from /<<PKGBUILDDIR>>/src/rocksdb/util/crc32c_arm64.h:15,
                   from /<<PKGBUILDDIR>>/src/rocksdb/util/crc32c.cc:21:
  /usr/lib/gcc/aarch64-linux-gnu/9/include/arm_acle.h:33:1: note: ‘extern "C"’ linkage started here
     33 | extern "C" {
        | ^~~~~~~~~~

  This is fixed here:
  https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=8c92fcb13a4979232787f0476bf7469ccbb03617

  [ Test Case ]
  Compiling ceph for the yoga cloud archive fails with the error above and will be successful with the patch applied.

  [ Regression Potential ]
  This is actually fixing a regression. The patch that is picked has already landed upstream. It is also architecture specific, only seen on arm64.

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