[Bug 1964260] Re: Fix mismatched extern "C" block for aarch64

[Corey Bryant]

** Also affects: gcc-9 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: gcc-9 (Ubuntu Impish)
   Importance: Undecided
       Status: New

** Also affects: gcc-9 (Ubuntu Jammy)
   Importance: High
       Status: Triaged

** Changed in: gcc-9 (Ubuntu Impish)
       Status: New => Triaged

** Changed in: gcc-9 (Ubuntu Focal)
       Status: New => Triaged

** Changed in: gcc-9 (Ubuntu Focal)
   Importance: Undecided => High

** Changed in: gcc-9 (Ubuntu Impish)
   Importance: Undecided => High

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

Title:
  Fix mismatched extern "C" block for aarch64

Status in gcc-9 package in Ubuntu:
  Triaged
Status in gcc-9 source package in Focal:
  Triaged
Status in gcc-9 source package in Impish:
  Triaged
Status in gcc-9 source package in Jammy:
  Triaged

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.

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