本文写于 2020 年初，实现 armv8 下穿插编译 webengine，备份转载于此 原文链接

我的平台：On Windows10 WSL2 Debian
（注：Ubuntu <= 16.04 会呈现 libclang < 3.8 的问题）

下载源码

为防止网络问题，先装置一个下载工具，应用aria2能够断点持续下载

sudo apt install aria2

而后 cd 到一个工作目录
Qt 5.12.5 源码

aria2c https://mirrors.tuna.tsinghua.edu.cn/qt/official_releases/qt/5.12/5.12.5/single/qt-everywhere-src-5.12.5.tar.xztar xf qt-everywhere-src-5.12.5.tar.xz

穿插编译工具 Linaro GCC

aria2c https://releases.linaro.org/components/toolchain/binaries/latest-5/aarch64-linux-gnu/gcc-linaro-5.5.0-2017.10-x86_64_aarch64-linux-gnu.tar.xztar xf gcc-linaro-5.5.0-2017.10-x86_64_aarch64-linux-gnu.tar.xz

在指标平台装置依赖

库

sudo apt-get install '.*libxcb.*' libxrender-dev libxi-dev \    libfontconfig1-dev libudev-dev libxkbcommon-dev \    libxkbcommon-x11-dev libc6-dev-arm64-cross libnss3-dev libicu-dev \    libdbus-1-dev

GLES 和 EGL

mkdir /home/nvidia/GLEScd /home/nvidia/GLESapt-get download libgles2-mesa-devar x libgles2*.debtar -xvf data.tar.xzmkdir /home/nvidia/EGLcd /home/nvidia/EGLapt-get download libegl1-mesa-devar x libegl1*.debtar -xvf data.tar.xzcd /home/nvidia/GLES/usr/includesudo cp -r GLES2 GLES3 /usr/includecd /home/nvidia/EGL/usr/includesudo cp -r EGL KHR /usr/include

在本机装置依赖

sudo apt-get install -y 'libxcb.*' \    libx11-xcb-dev libglu1-mesa-dev \    libxrender-dev libxi-dev libinput* \    mtdev* mesa-utils \    mesa-utils-extra libgles2-mesa-dev ninja-build \    git rsync pkg-config gcc g++

ps:

以上依赖可能不全，如果 confugre 后提醒 xxx 找不到，例如 xxx 找不到

通常能够间接 apt install libxxx-dev

有的库可能带有版本号，例如 libnss3-dev,能够应用 apt search xxx 搜寻

装置后从新来一遍上面的全部内容

从指标平台拷贝依赖

这里的 ip 换成本人的 ip

rsync -avz -e ssh nvidia@192.168.12.232:/lib/aarch64-linux-gnu librsync -avz -e ssh nvidia@192.168.12.232:/usr/include usrrsync -avz -e ssh nvidia@192.168.12.232:/usr/lib usrrsync -avz -e ssh nvidia@192.168.12.232:/usr/libaarch64-linux-gnu usrrsync -avz -e ssh nvidia@192.168.12.232:/usr/aarch64-linux-gnu usr

因为有一些依赖实际上是一个symbol link，所以要替换门路

wget https://raw.githubusercontent.com/riscv/riscv-poky/master/scripts/sysroot-relativelinks.pychmod +x sysroot-relativelinks.py./sysroot-relativelinks.py PATH_TO_YOUR_DIR

如果链接不到raw.githubusercontent.com建一个python脚本mkdir sysroot-relativelinks.py && chomod +x sysroot-relativelinks.py && vim sysroot-relativelinks.py:

#!/usr/bin/env pythonimport sysimport os# Take a sysroot directory and turn all the abolute symlinks and turn them into# relative ones such that the sysroot is usable within another system.if len(sys.argv) != 2:    print("Usage is " + sys.argv[0] + "<directory>")    sys.exit(1)topdir = sys.argv[1]topdir = os.path.abspath(topdir)def handlelink(filep, subdir):    link = os.readlink(filep)    if link[0] != "/":        return    if link.startswith(topdir):        return    #print("Replacing %s with %s for %s" % (link, topdir+link, filep))    print("Replacing %s with %s for %s" % (link, os.path.relpath(topdir+link, subdir), filep))    os.unlink(filep)    os.symlink(os.path.relpath(topdir+link, subdir), filep)for subdir, dirs, files in os.walk(topdir):    for f in files:        filep = os.path.join(subdir, f)        if os.path.islink(filep):            #print("Considering %s" % filep)            handlelink(filep, subdir)

运行 ./sysroot-relativelinks.py PATH_TO_YOUR_DIR

还要替换一个.a的库

ln -sf $PWD/usr/aarch64-linux-gnu/lib/libm.a $PWD/usr/lib/aarch64-linux-gnu/libm.a

编译

批改Qt make时include和lib的查找程序

vim qt-everywhere-src-5.12.5/qtbase/mkspecs/devices/linux-jetson-tx1-g++/qmake.conf

正文掉 /usr/include

QMAKE_INCDIR_POST += \#   $$[QT_SYSROOT]/usr/include \    $$[QT_SYSROOT]/usr/include/aarch64-linux-gnu

调整LIBDIR和RPATHLIBKDIR的程序，把/usr/lib/aarch64结尾的放到/usr/lib的后面

QMAKE_LIBDIR_POST += \    $$[QT_SYSROOT]/usr/lib/aarch64-linux-gnu \    $$[QT_SYSROOT]/usr/lib \    $$[QT_SYSROOT]/lib/aarch64-linux-gnuQMAKE_RPATHLINKDIR_POST += \    $$[QT_SYSROOT]/usr/lib/aarch64-linux-gnu/tegra \    $$[QT_SYSROOT]/usr/lib/aarch64-linux-gnu \    $$[QT_SYSROOT]/usr/lib \    $$[QT_SYSROOT]/lib/aarch64-linux-gnu

替换上面的 CROSS_COMPILE 门路为本人的gcc-linaro门路

prefix为装置门路(这个目录是应用穿插编译后的程序主动寻找的QT_DIR目录，当然会被环境变量笼罩)

extprefix为编译后指标主机 Qt 的门路

hostprefix为编译进去的穿插编译工具的门路

sysroot 为刚刚同步库文件的目录

cd qt-everywhere-src-5.12.5./configure -shared -c++std c++14 \ -opensource -release --confirm-license -pkg-config \ -no-use-gold-linker \ -device linux-jetson-tx1-g++ \ -device-option CROSS_COMPILE=/home/linger/crossbuild/gcc-linaro-5.5.0-2017.10-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu- \ -sysroot /home/linger/crossbuild \ -nomake examples -nomake tests \ -prefix /home/linger/crossbuild/JetsonTX2/qt5 \ -extprefix /home/linger/crossbuild/JetsonTX2/qt5 \ -hostprefix /home/linger/crossbuild/JetsonTX2/qt5-host \ -opengl es2 \ -pch \ -skip qtwayland \ -skip qtscript \ -skip qtandroidextras \ -skip qtdoc \ -skip qtremoteobjects \ -skip qtlocation \ -make libs \ -no-gbm \ -no-glib \ -qt-libpng \ -qt-libjpeg \ -qt-harfbuzz \ -qt-freetype \ -qt-xcb

config实现后应没有warning和error，如果有依赖问题装置好依赖后删除config.cache从新configure

如果提醒dbus有问题，在确认装置好libdbus-1-dev后
批改 DEPS/usr/lib/aarch64-linux-gnu/pkgconfig/dbus-1.pc
在 Libs 前面增加 -lpthread -lsystemd

编译装置

ps:

编译前确保(free -m)本人的内存+swap 大于 16G, 否则会在编译 chrominm 时挂掉

Linux swapfile 10G, count为大小, 目录地位没有限度，btrfs在kernel 5.0前不反对native swap

cd /varsudo mkdir swapsudo dd if=/dev/zero of=swapfile bs=1024 count=1024000sudo mkswap swapfile# 开启sudo swapon /var/swapfile# 敞开sudo swapoff /var/swapfile

编译

make -j4make install

如果编译过程中提醒找不到 gn

# 须要代理：git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git# 镜像：git clone https://source.codeaurora.org/quic/lc/chromium/tools/depot_toolsexport PATH=$PATH:PATH_TO_YOUR_depot_tools

装置

cd JetsonTX2scp -r qt5 nvidia@192.168.12.232:/usr/local

增加环境变量

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/qt5/libexport QT_PLUGIN_PATH=/usr/local/qt5/pluginsexport QML_IMPORT_PATH=/usr/local/qt5/qmlexport QML2_IMPORT_PATH=/usr/local/qt5/qmlexport QT5_DIR=/usr/local/qt5

编译带 WebEngine 的程序须要把 webegnineprocess 和依赖带到程序目录下

qt-everywhere-src-5.12.5/qtwebengine/src/core/release下的qtwebengine_locales文件夹、qtwebengine_resources_结尾的.pak文件、icudtl.dat

如果提醒：
ERROR:zygote_host_impl_linux.cc(88)] Running as root without --no-sandbox is not supported. See https://crbug.com/638180.

切换到非root用户或禁用 Sandbox：export QTWEBENGINE_DISABLE_SANDBOX=1

参考链接：

  1. QtWebBrowser fails to launch with QtLauncher Demo
  2. Cross-Compile the Qt Libraries for Nvidia® Jetson TX2 and Set the QtCreator Environment
  3. Windows下定制编译QtWebEngine
  4. https://github.com/riscv/riscv-poky
  5. https://doc.qt.io/qt-5/configure-options.html
  6. https://forum.qt.io/topic/99978/a-suitable-version-of-nss-could-not-be-found-cross-compile-raspberry-pi3-qt5-10-1