qmlprojectexporter is in practice a wrapper around other Qt for MCUs tools, such as qulrcc, qmltocpp, and qulfontcompiler. For debug purposes, it might be useful to print the calls to those tools to standard output.
qmlprojectexporter --verbose -output output-dir my_project.qmlproject
This option was introduced in QmlProject API 1.3 .
Available under certain Qt licenses.
Find out more.