[Bug c/100985] New: Aarch64 acle.h "extern "C" {" mismatch "}" in 9.4.0

[Bug c/100985] New: Aarch64 acle.h "extern "C" {" mismatch "}" in 9.4.0

[kevin.zhao at linaro dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100985

            Bug ID: 100985
           Summary: Aarch64 acle.h "extern "C" {" mismatch "}" in 9.4.0
           Product: gcc
           Version: 9.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kevin.zhao at linaro dot org
  Target Milestone: ---

Build rocksdb with GCC 9.4.0:
# git clone https://github.com/facebook/rocksdb.git
# cd rocksdb
# make static_lib

Log as below:
====================================================
$DEBUG_LEVEL is 0
  CC       util/crc32c.o
util/crc32c.cc:371:1: error: template with C linkage
  371 | template<void (*CRC32)(uint64_t*, uint8_t const**)>
      | ^~~~~~~~
In file included from ./util/crc32c_arm64.h:16,
                 from 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" {
      | ^~~~~~~~~~
util/crc32c.cc:503:13: error: conflicting declaration of ‘std::string
rocksdb::crc32c::IsFastCrc32Supported()’ with ‘C’ linkage
  503 | std::string IsFastCrc32Supported() {
      |             ^~~~~~~~~~~~~~~~~~~~
In file included from util/crc32c.cc:12:
./util/crc32c.h:20:20: note: previous declaration with ‘C++’ linkage
   20 | extern std::string IsFastCrc32Supported();
      |                    ^~~~~~~~~~~~~~~~~~~~
util/crc32c.cc:1277:10: error: conflicting declaration of ‘uint32_t
rocksdb::crc32c::Extend(uint32_t, const char*, size_t)’ with ‘C’ linkage
 1277 | uint32_t Extend(uint32_t crc, const char* buf, size_t size) {
      |          ^~~~~~
In file included from util/crc32c.cc:12:
./util/crc32c.h:25:17: note: previous declaration with ‘C++’ linkage
   25 | extern uint32_t Extend(uint32_t init_crc, const char* data, size_t n);
      |                 ^~~~~~
util/crc32c.cc:1283:1: error: expected ‘}’ at end of input
 1283 | }  // namespace ROCKSDB_NAMESPACE
      | ^
In file included from ./util/crc32c_arm64.h:16,
                 from util/crc32c.cc:21:
/usr/lib/gcc/aarch64-linux-gnu/9/include/arm_acle.h:33:12: note: to match this
‘{’
   33 | extern "C" {
      |            ^
Makefile:2272: recipe for target 'util/crc32c.o' failed
make: *** [util/crc32c.o] Error 1
===========================================================

The latest patch of GCC 9.4.0 release:
https://github.com/gcc-mirror/gcc/commit/6f06be1769d45359940c60517f9d55bedd3cb1f4#diff-64cabf812b3706ffd3c5ab7c6048c3617a406f029631d0427d3cfb896fd8dbf3R32
introduce a lonely induce that build issue:
#ifdef __cplusplus
extern "C" {
#endif

[Bug target/100985] [9 Regression] Aarch64 acle.h "extern "C" {" mismatch "}" in 9.4.0

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100985

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |9.5
             Target|                            |aarch64-*-*
          Component|c                           |target
            Summary|Aarch64 acle.h "extern "C"  |[9 Regression] Aarch64
                   |{" mismatch "}" in 9.4.0    |acle.h "extern "C" {"
                   |                            |mismatch "}" in 9.4.0

[Bug target/100985] [9 Regression] Aarch64 acle.h "extern "C" {" mismatch "}" in 9.4.0

[acoplan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100985

Alex Coplan <acoplan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-06-09
      Known to fail|                            |9.4.0
                 CC|                            |acoplan at gcc dot gnu.org,
                   |                            |ktkachov at gcc dot gnu.org
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Alex Coplan <acoplan at gcc dot gnu.org> ---
Confirmed by inspection of the source on the head of the 9 branch.

[Bug target/100985] [9 Regression] Aarch64 acle.h "extern "C" {" mismatch "}" in 9.4.0

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100985

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |redi at gcc dot gnu.org

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 103846 has been marked as a duplicate of this bug. ***

[Bug target/100985] [9 Regression] Aarch64 acle.h "extern "C" {" mismatch "}" in 9.4.0

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100985

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:8c92fcb13a4979232787f0476bf7469ccbb03617

commit r9-9888-g8c92fcb13a4979232787f0476bf7469ccbb03617
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Dec 27 16:20:24 2021 +0000

    aarch64: Fix mismatched extern "C" block [PR100985]

    gcc/ChangeLog:

            PR target/100985
            * config/aarch64/arm_acle.h: Remove unclosed extern "C" block.

[Bug target/100985] [9 Regression] Aarch64 acle.h "extern "C" {" mismatch "}" in 9.4.0

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100985

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This should be fixed for gcc-9.5.0

[Bug target/100985] [9 Regression] Aarch64 acle.h "extern "C" {" mismatch "}" in 9.4.0

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100985

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 106382 has been marked as a duplicate of this bug. ***