Connector/C++ now compiles cleanly using Clang for Linux and Solaris. (WL #15065)

Several CMake options have been added or updated to enable using external sources (or builds) of third-party components, like compression libraries and the Protobuf compiler, on which Connector/C++ depends. These options permit substituting external source locations at configuration time if required.

Supported options are:

Currently, bundled third-party libraries used by connector are linked statically to it. Externally sourced libraries are linked dynamically. Long-standing issues, such as applications that link to the static connector library (libmysqlcppconn8-static.a) not being able to also link to a Protobuf library at the same time, now are resolved by building from sources a variant that links Protobuf dynamically.

For more information, see Specifying External Dependencies. (Bug #32117299, WL #15064)

For platforms on which OpenSSL libraries are bundled, the linked OpenSSL library for Connector/C++ has been updated to version 1.1.1q. Issues fixed in the new OpenSSL version are described at https://www.openssl.org/news/cl111.txt and https://www.openssl.org/news/vulnerabilities.html. (Bug #34414692)

If building the legacy JDBC connector from source, using an additional git command to perform submodule initialization is no longer necessary. (WL #15182)

X DevAPI: If an application program called mysqlx_session_close after disconnecting from the Internet, an exception from Connector/C++ could cause the application to halt unexpectedly. (Bug #107692, Bug #34338950)

On Windows, compiler difficulties were encountered because unistd.h was used to call getcwd rather than using various Windows alternatives. Our thanks to Luis Pinto for the patch. (Bug #108355, Bug #34553226)

The libcrypto library, which libssl attempted to link to, was installed in an unexpected directory by the Connector/C++ binary distribution for macOS. This fix ensures that both bundled libraries are installed in the same directory. (Bug #107947, Bug #34417381)