[Bug 1400299] [NEW] rocksdb ftbfs on ppc64el with -03

[James Page]

Public bug reported:

The rocksdb library in the ceph source tree fails to build with the
default -03 optimizer flag on ppc64el.

(vivid-ppc64el)jamespage at kelsey01:~/build-area/ceph-0.87/src/rocksdb$ g++ -DHAVE_CONFIG_H -I. -D_FORTIFY_SOURCE=2 -Wall -Werror -std=c++11 -fPIC -I. -I./include -DOS_LINUX -DROCKSDB_PLATFORM_POSIX -fno-builtin-memcmp -DNDEBUG -DHAVE_JEMALLOC -Woverloaded-virtual -DROCKSDB_ATOMIC_PRESENT -DROCKSDB_FALLOCATE_PRESENT -DROCKSDB_ATOMIC_PRESENT -DROCKSDB_FALLOCATE_PRESENT -DSNAPPY -DZLIB -DBZIP2 -g -O3 -fstack-protector-strong -Wformat -Werror=format-security -std=c++11 -c table/plain_table_reader.cc -fPIE -o table/librocksdb_la-plain_table_reader.o
In file included from ./table/plain_table_reader.h:14:0,
                 from table/plain_table_reader.cc:6:
./db/dbformat.h: In member function 'virtual void rocksdb::PlainTableIterator::Next()':
./db/dbformat.h:266:67: error: 'parsed_key.rocksdb::ParsedInternalKey::sequence' may be used uninitialized in this function [-Werror=maybe-uninitialized]
     EncodeFixed64(key_ + usize, PackSequenceAndType(s, value_type));
                                                                   ^
table/plain_table_reader.cc:737:23: note: 'parsed_key.rocksdb::ParsedInternalKey::sequence' was declared here
     ParsedInternalKey parsed_key;
                       ^
In file included from ./table/plain_table_reader.h:14:0,
                 from table/plain_table_reader.cc:6:
./db/dbformat.h:266:67: error: '*((void*)& parsed_key +24)' may be used uninitialized in this function [-Werror=maybe-uninitialized]
     EncodeFixed64(key_ + usize, PackSequenceAndType(s, value_type));
                                                                   ^
table/plain_table_reader.cc:737:23: note: '*((void*)& parsed_key +24)' was declared here
     ParsedInternalKey parsed_key;
                       ^
cc1plus: all warnings being treated as errors

Works OK with -02

(vivid-ppc64el)jamespage at kelsey01:~/build-area/ceph-0.87/src/rocksdb$
g++ -DHAVE_CONFIG_H -I. -D_FORTIFY_SOURCE=2 -Wall -Werror -std=c++11
-fPIC -I. -I./include -DOS_LINUX -DROCKSDB_PLATFORM_POSIX -fno-builtin-
memcmp -DNDEBUG -DHAVE_JEMALLOC -Woverloaded-virtual
-DROCKSDB_ATOMIC_PRESENT -DROCKSDB_FALLOCATE_PRESENT
-DROCKSDB_ATOMIC_PRESENT -DROCKSDB_FALLOCATE_PRESENT -DSNAPPY -DZLIB
-DBZIP2 -g -O2 -fstack-protector-strong -Wformat -Werror=format-security
-std=c++11 -c table/plain_table_reader.cc -fPIE -o table/librocksdb_la-
plain_table_reader.o

Full log:

https://launchpadlibrarian.net/191913939/buildlog_ubuntu-vivid-
ppc64el.ceph_0.87-0ubuntu1_FAILEDTOBUILD.txt.gz

** Affects: ceph (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gcc-4.9 (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- rocksdb ftbfs on ppc64el
+ rocksdb ftbfs on ppc64el with -03

-- 
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to ceph in Ubuntu.
https://bugs.launchpad.net/bugs/1400299

Title:
  rocksdb ftbfs on ppc64el with -03

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ceph/+bug/1400299/+subscriptions