monotone: mtn: Symbol has different size in shared object, consider re-linking

[DouglasDD]

Monotone commands run, and return success, but every invocation spews linking warnings to stderr:

0 $ /usr/bin/mtn --version
/usr/bin/mtn: Symbol `_ZTVN5Botan17DataSource_MemoryE' has different size in shared object, consider re-linking
monotone 1.0 (base revision: a7c3a1d9de1ba7a62c9dd9efee17252234bb502c)

(I've worked around this by putting a pre-built binary from <monotone.ca> into /usr/local/bin/
    BUT reported & documented this bug for the sake of fixing
    whatever tools and process led to this state)

#### Summary
/usr/bin/mtn 1.0-12 (amd64) on trusty 14.04.5 LTS
Linking issue with libbotan 1.10.5-1+deb7u1ubuntu0.14.04.1
    vtable for Botan::DataSource_Memory

#### Debugging & Details
I've run `sudo apt-get update` and `sudo apt-get upgrade` today.

### Distro
0 $ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.5 LTS"

## STDERR & success:
0 $ /usr/bin/mtn --version 2>/dev/null && echo True
monotone 1.0 (base revision: a7c3a1d9de1ba7a62c9dd9efee17252234bb502c)
True

## Version
0 $ dpkg -l | egrep 'mtn|monotone'
ii monotone 1.0-12 amd64 Distributed version (revision) control system
ii monotone-extras 1.0-12 all Distributed version (revision) control system - extras

## Find the problem shared library
0 $ apt-cache show monotone | grep ^Depend
Depends: libbotan-1.10-0, libc6 (>= 2.15), libgcc1 (>= 1:4.1.1), libidn11 (>= 1.13), liblua5.1-0, libpcre3, libsqlite3-0 (>= 3.5.9), libstdc++6 (>= 4.6), zlib1g (>= 1:1.1.4), bash (>= 4.0)

0 $ dpkg -l | grep libbotan\\b
ii libbotan-1.10-0 1.10.5-1+deb7u1ubuntu0.14.04.1 amd64 multiplatform crypto library

0 $ dpkg -L libbotan-1.10-0 | egrep \\.so | xargs ls -l
lrwxrwxrwx 1 root root 20 Aug 20 2016 /usr/lib/libbotan-1.10.so.0 -> libbotan-1.10.so.0.5
-rw-r--r-- 1 root root 3098696 Aug 20 2016 /usr/lib/libbotan-1.10.so.0.5

0 $ objdump -T /usr/lib/libbotan-1.10.so.0.5 | grep '_ZTVN5Botan17DataSource_MemoryE'
00000000004e1dc0 w DO .data.rel.ro 0000000000000048 Base _ZTVN5Botan17DataSource_MemoryE

0 $ objdump -TC /usr/lib/libbotan-1.10.so.0.5 | egrep '\bDataSource.*Memory\b'
000000000013fde0 g DF .text 000000000000000f Base Botan::DataSource_Memory::check_available(unsigned long)
0000000000140d50 w DF .text 0000000000000063 Base Botan::DataSource_Memory::~DataSource_Memory()
00000000004e1d70 w DO .data.rel.ro 0000000000000018 Base typeinfo for Botan::DataSource_Memory
0000000000140b90 g DF .text 000000000000013f Base Botan::DataSource_Memory::DataSource_Memory(std::string const&)
00000000004e1dc0 w DO .data.rel.ro 0000000000000048 Base vtable for Botan::DataSource_Memory
0000000000140a50 g DF .text 000000000000013f Base Botan::DataSource_Memory::DataSource_Memory(unsigned char const*, unsigned long)
0000000000140cd0 w DF .text 0000000000000071 Base Botan::DataSource_Memory::~DataSource_Memory()
0000000000140580 g DF .text 000000000000014f Base Botan::DataSource_Memory::DataSource_Memory(Botan::MemoryRegion<unsigned char> const&)
000000000026ddb0 w DO .rodata 000000000000001c Base typeinfo name for Botan::DataSource_Memory
0000000000140cd0 w DF .text 0000000000000071 Base Botan::DataSource_Memory::~DataSource_Memory()
0000000000140b90 g DF .text 000000000000013f Base Botan::DataSource_Memory::DataSource_Memory(std::string const&)
000000000013fdd0 g DF .text 000000000000000c Base Botan::DataSource_Memory::end_of_data() const
0000000000140580 g DF .text 000000000000014f Base Botan::DataSource_Memory::DataSource_Memory(Botan::MemoryRegion<unsigned char> const&)
0000000000140a50 g DF .text 000000000000013f Base Botan::DataSource_Memory::DataSource_Memory(unsigned char const*, unsigned long)
000000000013fe50 g DF .text 000000000000003c Base Botan::DataSource_Memory::peek(unsigned char*, unsigned long, unsigned long) const
000000000013fe10 g DF .text 000000000000003b Base Botan::DataSource_Memory::read(unsigned char*, unsigned long)

## Matching the address offset finds the specific source of the complaint:
00000000004e1dc0 w DO .data.rel.ro 0000000000000048 Base vtable for Botan::DataSource_Memory

## Paranoia:
0 $ sha1sum /usr/bin/mtn
746d0f6352e7c9af312e93e4ac875e0909945110 /usr/bin/mtn