I am not able to build Qt 5.8 with MySQL support using the same libs, compiler and configuration options that work fine for 5.7 and 5.71:

-L E:\msys64\mingw64\lib -qt-sql-psql -qt-sql-mysql -l mysqlclient -I E:\msys64\mingw64\include\mariadb

While this works for previous versions of Qt, for 5.8 I get:

ERROR: Invalid value given for boolean command line option 'sql-psql'.
ERROR: Invalid value given for boolean command line option 'sql-mysql'.
ERROR: Unknown command line option '-l'.
Qmake failed, return code 3

The documentation for Qt 5.8 still says to use -qt-sql-driver or -plugin-sql-driver or -no-sql-driver format, however that no longer appears to work, so I guess the documentation needs updating too.

The sql-driver format appears to work, but in this case, how do we specify whether we want it plug-in or built-in?

The -l option is also removed, so I can't pass a specific library to the configuration.

So what I try to do is build with the following options instead:

-L E:\msys64\mingw64\lib -sql-psql -sql-mysql -I E:\msys64\mingw64\include\mariadb

However, even though this configuration is able to detect psql, it fails for mysql:

ERROR: Feature 'sql-mysql' was enabled, but the pre-condition 'libs.mysql' failed.