They are probably referring to the changes wrt std::string and std::list

Pre-C++11 a lot of standard libraries used copy-on-write strings, which was forbidden in C++11.

std::list now has to have O(1) size, which is another possibly ABI incompatible change.

More details here: https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html

On 21 June 2017 at 01:09, Marek Skalický via Boost-users <boost-users@lists.boost.org> wrote:

Hi,
mongo-cxx-driver notices this:
"Important note about C++11/C++14: The boost libraries do not offer a
stable ABI across different versions of the C++ standard. As a result,
you must ensure that your application, the C++ driver, and boost are
all built with the same language standard. In particular, if you are
building the C++ driver with C++11 enabled, you must also build your
application with C++11 enabled, and link against a C++11 compiled
boost. " [1]

Is it true? What changes with new standard? (or is this only related to
ABI change in gcc introduced by c++11?)

I'm interested mainly in libraries: filesystem, chrono, thread, system
and regex

Thanks,
Marek

[1] http://mongodb.github.io/mongo-cxx-driver/legacy-v1/installation/#s
cons-options-when-compiling-the-c-driver
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