With the fix for CONC-624, usage of an anonymous variadic macro was introduced to the MariaDB 3.1.x code base, which has the effect of now requiring C++11 or newer (as C++03 does not support anonymous variadic macros)

This results in the following compilation warning/error when using C++03

usr/include/mysql/mariadb_stmt.h:37:43: warning: anonymous variadic macros were introduced in C++11 [-Wvariadic-macros]

   37 | #define SET_CLIENT_STMT_ERROR(a, b, c, d, ...) \

      |                                           ^~~

It is unclear if this change to break support (I'm assuming as the client used to compile cleanly this is a break) was intentional or not.