要安装哪个模块来修复Yocto的“模块QtQuick.Controls.Styles未安装”错误？

Question

我已经成功地为跟随RPi2的本教程构建了Yocto映像。我决定扩展QML演示，并尝试一些Qt快速样式(import QtQuick.Controls.Styles 1.4)。

下面是图像的bb文件

# Pulled from a mix of different images:
include recipes-core/images/rpi-basic-image.bb

# This image is a little more full featured, and includes wifi
# support, provided you have a raspberrypi3
inherit linux-raspberrypi-base

SUMMARY = "The minimal image that can run Qt5 applications"
LICENSE = "MIT"

# depend on bcm2835, which will bring in rpi-config
DEPENDS += "bcm2835-bootfiles"

MY_TOOLS = " \
    qtbase \
    qtbase-dev \
    qtbase-mkspecs \
    qtbase-plugins \
    qtbase-tools \
"

MY_PKGS = " \
    qt3d \
    qt3d-dev \
    qt3d-mkspecs \
    qtcharts \
    qtcharts-dev \
    qtcharts-mkspecs \
    qtconnectivity-dev \
    qtconnectivity-mkspecs \
    qtquickcontrols2 \
    qtquickcontrols2-dev \
    qtquickcontrols2-mkspecs \
    qtdeclarative \
    qtdeclarative-dev \
    qtdeclarative-mkspecs \
    qtgraphicaleffects \
    qtgraphicaleffects-dev \
"

MY_FEATURES = " \
    linux-firmware-bcm43430 \
    bluez5 \
    i2c-tools \
    python-smbus \
    bridge-utils \
    hostapd \
    dhcp-server \
    iptables \
    wpa-supplicant \
"

DISTRO_FEATURES_append += " bluez5 bluetooth wifi"

IMAGE_INSTALL_append = " \
    ${MY_TOOLS} \
    ${MY_PKGS} \
    ${MY_FEATURES} \
    basicquick \
"
# Qt >5.7 doesn't ship with fonts, so these need to be added explicitely
IMAGE_INSTALL_append = "\
    ttf-dejavu-sans \
    ttf-dejavu-sans-mono \
    ttf-dejavu-sans-condensed \
    ttf-dejavu-serif \
    ttf-dejavu-serif-condensed \
    ttf-dejavu-common \
"

以及演示本身的bb文件

SUMMARY = "Simple Qt5 Quick application"
SECTION = "examples"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"

# I want to make sure these get installed too.
DEPENDS += "qtbase qtdeclarative qtquickcontrols2"

SRCREV = "${AUTOREV}"

# GitLab own repo
SRC_URI[sha256sum] = "f2dcc13cda523e9aa9e8e1db6752b3dfaf4b531bfc9bb8e272eb3bfc5974738a"
SRC_URI = "git://git@gitlab.com:/some-repo.git;protocol=ssh"

S = "${WORKDIR}/git"

require recipes-qt/qt5/qt5.inc

do_install() {
      install -d ${D}${bindir}
      install -m 0755 BasicQuick ${D}${bindir}
}

执行时我得到了错误

QQmlApplicationEngine failed to load component
qrc:/main.qml:24 Type Page2 unavailable
qrc:/Page2.qml:4 module "QtQuick.Controls.Styles" is not installed

Page2是我在main.qml中定义和使用的一项。演示在我的PC上运行，没有任何问题(定制构建的QT5.9.1)，但是由于缺少子模块，在RPi2上失败了。

坦率地说，我以前从未使用过这个子模块(我的定制构建的QT5.9.1已经启用了所有功能)，我不确定我需要包含什么(如果meta-qt5甚至提供它)，以便能够在Yocto系统上使用它。

Answer 1

问题是包的版本不匹配。

您使用的是版本1：

import QtQuick.Controls.Styles 1.4

但是构建版本2：

MY_PKGS = " \
    ...
    qtquickcontrols2 \
    ...

您需要在图像中包含的是qtquickcontrols。

Answer 2

您需要安装qtquickcontrols-qmlplugins。

只需添加到build/local.conf

PACKAGECONFIG_append_pn-qtbase = " accessibility"
PACKAGECONFIG_append_pn-qtquickcontrols = " accessibility"

IMAGE_INSTALL_append = " qtdeclarative-qmlplugins qtquickcontrols-qmlplugins"

这是原产手册https://importgeek.wordpress.com/2018/07/17/module-qtquick-controls-is-not-installed/