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

[Corey Bryant]

Public bug reported:

[ 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.

** Affects: gcc-9 (Ubuntu)
     Importance: High
         Status: Triaged

** Affects: gcc-9 (Ubuntu Focal)
     Importance: High
         Status: Triaged

** Affects: gcc-9 (Ubuntu Impish)
     Importance: High
         Status: Triaged

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

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

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

** Description changed:

+ [ 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**)>
-       | ^~~~~~~~
+   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:
+                  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" {
-       | ^~~~~~~~~~
- 
+    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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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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