[Bug 1400299] Re: rocksdb ftbfs on ppc64el with -03

[James Page]

I've disabled the rocksdb support generally across all architectures
with my last upload; an update to a newer version may help, but we
should also look to package it separately at some point.

** Changed in: ceph (Ubuntu)
   Importance: Undecided => Wishlist

** Changed in: ceph (Ubuntu)
       Status: New => Triaged

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Title:
  rocksdb ftbfs on ppc64el with -03

Status in ceph package in Ubuntu:
  Triaged
Status in gcc-4.9 package in Ubuntu:
  New

Bug description:
  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

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