For example suppose the following tool bar:

const auto toolbar = new QToolBar();

const auto btn1 = new QToolButton("short label");
btn1->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
toolbar->addWidget(btn1);

const auto btn2 = new QToolButton("*****  large label *****");
btn2->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
toolbar->addWidget(btn2);

How to make a QToolBar or a QHBoxLayout to layout items with exact same width? in this example both buttons should be of same width and get as minimum space as possible. i.e. not using QSizePolicy::Expanding. Please note that setting hard coded sizes is not an option for me since in my app, user can dynamically change font size.