-frtti inconsistent in build (undefined reference to `typeinfo for rocksdb::Comparator')

[Brian Carlson]

When linking to the shared library in librocksdb-dev, the linker is unable to find symbols in the shared library (for example -- undefined reference to `typeinfo for rocksdb::Comparator')

This is because the make line needs USE_RTTI=1:

When building rocksdb (at least for this version), the make all target defaults to using RTTI (and a DEBUG>0), where as make shared does not use RTTI (-fno-rtti option is passed and DEBUG == 0).

This causes problems for executable which are using rtti (i.e. have not explicitly specified -fno-rtti)

I believe the debian/rules file should have:
The USE_RTTI=1 is optional for the "make all" part of the target.

override_dh_auto_build:
 @echo ARCH=`uname -m`
 PORTABLE=1 USE_RTTI=1 make all
 PORTABLE=1 USE_RTTI=1 make shared_lib

Here are the typeinfo values in the current .so file:

$ nm --demangle --dynamic librocksdb.so.5.8.8 | grep typeinfo
000000000076e698 V typeinfo for rocksdb::RedisListException
                 U typeinfo for char const*
000000000076b620 V typeinfo for std::logic_error
000000000076b6e8 V typeinfo for std::future_error
000000000076b650 V typeinfo for std::out_of_range
0000000000767c88 V typeinfo for std::runtime_error
000000000076b638 V typeinfo for std::invalid_argument
0000000000767c78 V typeinfo for std::exception
00000000004ece00 V typeinfo name for rocksdb::RedisListException
00000000004e7db0 V typeinfo name for std::logic_error
00000000004e9170 V typeinfo name for std::future_error
00000000004e7de0 V typeinfo name for std::out_of_range
00000000004ddb60 V typeinfo name for std::runtime_error
00000000004e7dc0 V typeinfo name for std::invalid_argument
00000000004ddb48 V typeinfo name for std::exception

After making the previous change in override_dh_auto_build, the typeinfo values are:
$ nm --demangle --dynamic ./librocksdb.so|grep typeinfo|grep -i comparator
00000000007855c8 V typeinfo for rocksdb_comparator_t
000000000078bdb0 V typeinfo for rocksdb::Comparator
0000000000787868 V typeinfo for rocksdb::MemTableRep::KeyComparator
0000000000787498 V typeinfo for rocksdb::InternalKeyComparator
00000000007878b0 V typeinfo for rocksdb::MemTable::KeyComparator
00000000004eebb0 V typeinfo name for rocksdb_comparator_t
0000000000501c70 V typeinfo name for rocksdb::Comparator
00000000004f6c20 V typeinfo name for rocksdb::MemTableRep::KeyComparator
00000000004f50c0 V typeinfo name for rocksdb::InternalKeyComparator
00000000004f6ca0 V typeinfo name for rocksdb::MemTable::KeyComparator

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jan Wielemaker (j-wielemaker)]

This also applies MergeOperator. In addition, the static lib is not compiled with -fPIC and can thus not be used to create a plugin (.so) for another project. See also https://github.com/facebook/rocksdb/issues/3811