Probe Item
Probe
items can appear inside products and projects. They are run prior to building, for instance to locate dependent headers, libraries, and other files outside the project directory whose locations are not known ahead of time. Probes can be parameterized via their properties and typically store results in properties as well. These results are then retrieved via the Probe's id, which is mandatory:
Product { Probe { id: valueCalculator property string parameter: "whatever" property int value configure: { value = Utils.calculateValue(parameter); // Expensive operation found = true; } } property int theValue: valueCalculator.value }
Note: Because Probes often invoke external processes, which is relatively expensive compared to evaluating normal properties, their results are cached. To force re-evaluation of a Probe, you can supply the --force-probe-execution
command-line option.
Probe Properties
Property | Type | Default | Description |
---|---|---|---|
condition | bool | true | Determines whether the probe will actually be run. |
found | bool | undefined | Indicates whether the probe was run successfully. Set by configure . |
configure | script | undefined | Script that is executed when the probe is run. |