Ceph

Bug #51147

Updated by Kefu Chai almost 3 years ago

See: https://jenkins.ceph.com/job/ceph-pull-requests-arm64/15036/console 
 Build rocksdb failed on Ubuntu 18.04.5 with GCC 9.4.0. 


 Also this can be reproduced on Rocksdb master. 


 Log as below: 
 <pre> ==================================================== 
   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 
 </pre> =========================================================== 

 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: 
 <pre> 
 #ifdef __cplusplus 
 extern "C" { 
 #endif 
 </pre>

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