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Type: Bug
Resolution: Fixed
Priority: P2: Important
Fix Version/s: 6.8.5, 6.9.2, 6.10.0 Beta3, 6.10, 6.11.0 FF
Affects Version/s: 6.9
Component/s: QML: Tooling
Labels:
None
Environment:
Windows

Commits:
e365250e9 (dev), 063871f22 (6.10), f3d5e44df (dev), 0cf7d97ed (6.9), 0e0ca3792 (tqtc/lts-6.8), 5bd55b5c9 (6.10), 4ff1ce57c (6.9), 2ba1bbcc9 (tqtc/lts-6.8)

On Windows when qmllint is run as a process it does not populate error channel when it discover some errors. It return code -1, and error channel is empty.

How to reproduce it:

QProcess process;
process.setProcessChannelMode(QProcess::SeparateChannels);    
process.start("qmllint", {"PUT_PATH_TO_QML_FILE_WITH_ERRORS_HERE"});
if (!process.waitForFinished()) {
  process.kill();
  qDebug() << "QMLLINT didn't finish";
}
if (process.exitStatus() != QProcess::NormalExit) {
  qDebug() << "QMLLINT wrong exit";
}

QString output = process.readAllStandardOutput();
QString error = process.readAllStandardError();

qDebug() << "QMLLINT qmllint output: " << output;
qDebug() << "QMLLINT qmllint errors: " << error;

Replace "PUT_PATH_TO_QML_FILE_WITH_ERRORS_HERE" with path to this qml file:

import QtQuick 2.15
import QtQuick.Window 2.15Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
    Rectangle {
        id: rect
        width: 100
        height: 100
        color: "ble"
        MouseArea {
            anchors. + fill: pant
            onClicked: {
                console.log(rect.x)
                console.log(ry)
                console.log(rect.width)
                console.log(rect.height)        }
    }
}

This file contain errors, but when runed from QtCreator you can see in Application Output, that prints do not have any information about errors from readAllStandardError() and exit code is -1.

But if you replace this file with one that has only warning:

import QtQuick 2.15Item {id: root
width: 100
height: 100rectangle {
    id: rectangle
    anchors.fill: parent
    color: "blue"    MouseArea {
        anchors.fill: parent
        onClicked: {
            rectangle.color = Qt.rgba(Math.random(), Math.random(), Math.random(), 1);
        }
    }
}
}

You will get exitCode 0, and readAllStandardError() will properly have information about warnings.

The only exception to that i when we use "–json " (with dash instead of json filename). Then the output has proper information about errors. But in json format which is not always wanted.