\li \c COPY_COMMENTS copies comments from \c .proto files. If provided in
the parameter list, comments related to messages and fields are copied to
generated header files.
\li \c GENERATE_PACKAGE_SUBFOLDERS generates a folder structure for the
generated files matching the \c .proto file's package name. For example,
\c{package io.qt.test;} would put the generated files into \c {io/qt/test/}.
\li \c EXTRA_NAMESPACE is an optional namespace that will be used for the
generated classes. The classes are always generated in a namespace whose
name is the same as the package name specified in the \c .proto file.
If this option is used, then everything will be nested inside the extra
namespace.
\li \c EXPORT_MACRO is the base name of the symbol export macro used for
the generated code. The generated macro name is constructed as
\c QPB_<EXPORT_MACRO>_EXPORT. If the option is not set, the macro is not
generated.

