qt5.15.2 交叉编译 loongarch64

• qt5.15.2 交叉编译 loongarch64
  • 1. 环境
  • 2. 准备依赖
    • 2.1. 软件包说明
    • 2.2. 配置交叉编译环境
    • 2.3. 升级系统 GCC
    • 2.4. 下载依赖
    • 2.5. 编译依赖
      • 2.5.1. 前置条件
      • 2.5.2. 架构检测
      • 2.5.3. 编译依赖
      • 2.5.4. nss交叉编译
      • 2.5.5. nodejs下载
      • 2.5.6. 检查编译
  • 3. 编译Qt
    • 3.1. 环境配置
    • 3.2. 添加交叉编译平台
    • 3.3. qtwebengine
    • 3.4. 编译脚本
    • 3.5. 问题
      • 3.5.1. 问题一
      • 3.5.2. 问题二
      • 3.5.3. 问题三
      • 3.5.4. 问题四
      • 3.5.5. 问题五
      • 3.5.6. 问题六
  • 4. 验证
    • 4.1. 添加构建环境
  • 5. 总结
    • 5.1. /etc/profile
• 参考

该文主要介绍使用 CentOS7 x86_64 交叉编译为 loongarch64。

qt5.15.2 交叉编译 loongarch64

该篇文章都是基于上一篇文章 qt5.15.2交叉编译arm64 修改。

1. 环境

• 虚拟机系统：CentOS-7-x86_64-DVD-2207-02.iso
• 交叉编译工具链：loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3.tar.xz
• Qt：qt-everywhere-src-5.15.2.tar.xz

项目中用到证书以及网页，所以我需要 OpenSSL X11 WebEngine 模块

• X11 依赖：Qt for X11 Requirements Qt 5.15
• WebEngine 依赖：Qt WebEngine Platform Notes Qt WebEngine 5.15.16

编译qt core需要4G内存，编译X11需要8G，编译WebEngine至少需要24G，否则会内存耗尽导致退出

2. 准备依赖

2.1. 软件包说明

所有的原始文件都是放在 /cross 目录下

mkdir /cross
cd /cross

软件包	下载地址	路径	安装路径
loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3.tar.xz	http://www.loongnix.cn/zh/toolchain/GNU/	/cross	内部包含 sysroot
gcc-5.4.0.tar.gz	https://mirrors.nju.edu.cn/gnu/gcc/gcc-5.4.0/	/cross	/usr/local/gcc
各种依赖		/cross/dependence	/loongarch64

2.2. 配置交叉编译环境

loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3.tar.xz 是交叉编译工具链。

需要做的就是解压以及配置环境变量

# 解压
tar -xvf loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3.tar.xz
# 修改环境变量文件
vim /etc/profile
# 添加
export PATH=$PATH:/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin
# 使环境变量文件生效
source /etc/profile

使用 loongarch64-linux-gnu-gcc -v 查看到版本即为配置成功。

2.3. 升级系统 GCC

CentOS7 默认的版本的是 gcc4.8，为了和交叉编译统一，需要升级版本为 gcc5.4。

# 可能缺失基础 gcc
yum install gcc gcc-c++

# 升级 gcc
tar -xvf gcc-5.4.0.tar.gz
cd gcc-5.4.0
# 自动检查预编译环境并安装，需要联网
./contrib/download_prerequisites
# 安装路径是 /usr/local/gcc
./configure --prefix=/usr/local/gcc --enable-checking=release --enable-languages=c,c++ --disable-multilib
make -j4 && make install

# 修改环境变量文件
vim /etc/profile
# 添加
export PATH=/usr/local/gcc/bin:$PATH
export LD_LIBRARY_PATH=/usr/local/gcc/lib64:$LD_LIBRARY_PATH
# 使环境变量文件生效
source /etc/profile

使用 gcc -v 查看到版本即为配置成功。

2.4. 下载依赖

X11 相关下载网址：https://www.x.org/releases/individual/

文件都放在 /cross/dependence

mkdir /cross/dependence
cd /cross/dependence

以下是下载 OpenSSL X11 WebEngine 所需要依赖库的脚本 download_dependence.sh，需要联网使用且部分还需要挂代理。

#!/bin/sh
# openssl
wget -c https://www.openssl.org/source/old/1.1.1/openssl-1.1.1q.tar.gz

# x11 dependence
wget -c https://www.x.org/releases/individual/proto/xorgproto-2020.1.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXrender-0.9.10.tar.gz
wget -c https://www.x.org/releases/individual/lib/xtrans-1.4.0.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXau-1.0.9.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXrender-0.9.10.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXext-1.3.4.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXrandr-1.5.2.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXfixes-5.0.3.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXcomposite-0.4.5.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXcursor-1.2.0.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXi-1.7.10.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXScrnSaver-1.2.3.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXtst-1.2.3.tar.gz
wget -c https://www.x.org/releases/individual/lib/libxshmfence-1.3.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXxf86vm-1.1.4.tar.gz
wget -c https://www.x.org/releases/individual/util/util-macros-1.19.3.tar.gz
wget -c https://www.x.org/releases/individual/data/xkeyboard-config/xkeyboard-config-2.30.tar.gz
wget -c https://www.x.org/releases/individual/lib/libSM-1.2.3.tar.gz
wget -c https://www.x.org/releases/individual/lib/libICE-1.0.10.tar.gz
wget -c https://xkbcommon.org/download/libxkbcommon-1.4.0.tar.xz
wget -c https://dri.freedesktop.org/libdrm/libdrm-2.4.100.tar.gz

# xcb
wget -c https://www.x.org/releases/individual/xcb/libpthread-stubs-0.4.tar.gz
wget -c https://www.x.org/releases/individual/xcb/xcb-util-0.3.9.tar.gz
wget -c https://www.x.org/releases/individual/xcb/xcb-util-image-0.3.9.tar.gz
wget -c https://www.x.org/releases/individual/xcb/xcb-util-keysyms-0.3.9.tar.gz
wget -c https://www.x.org/releases/individual/xcb/xcb-util-wm-0.3.9.tar.gz
wget -c https://www.x.org/releases/individual/xcb/xcb-util-renderutil-0.3.9.tar.gz
wget -c https://www.x.org/releases/individual/xcb/xcb-proto-1.13.tar.gz
wget -c https://www.x.org/releases/individual/xcb/libxcb-1.13.tar.gz

# glib2
wget -c https://www.zlib.net/fossils/zlib-1.2.11.tar.gz
wget -c https://sourceforge.net/projects/pcre/files/pcre/8.45/pcre-8.45.tar.gz
wget -c https://github.com/libffi/libffi/releases/download/v3.4.3/libffi-3.4.3.tar.gz
wget -c https://github.com/SELinuxProject/selinux/releases/download/20191204/libsepol-3.0.tar.gz
wget -c https://github.com/SELinuxProject/selinux/releases/download/20191204/libselinux-3.0.tar.gz
wget -c https://ftp.acc.umu.se/pub/GNOME/sources/glib/2.61/glib-2.61.3.tar.xz

# x11
wget -c https://www.x.org/releases/individual/lib/libX11-1.7.5.tar.gz

# webengine
wget -c https://www.x.org/releases/individual/lib/libxkbfile-1.1.0.tar.gz
wget -c https://www.x.org/releases/individual/lib/libXdamage-1.1.5.tar.gz
wget -c https://github.com/libexpat/libexpat/releases/download/R_2_2_9/expat-2.2.9.tar.gz
wget -c https://dbus.freedesktop.org/releases/dbus/dbus-1.13.6.tar.gz
wget -c https://download.savannah.gnu.org/releases/freetype/freetype-2.10.1.tar.gz
wget -c ftp://xmlsoft.org/libxml2/libxml2-2.9.9.tar.gz
wget -c https://nchc.dl.sourceforge.net/project/libuuid/libuuid-1.0.3.tar.gz
wget -c https://www.freedesktop.org/software/fontconfig/release/fontconfig-2.13.92.tar.gz
wget -c https://github.com/sqlite/sqlite/archive/refs/tags/version-3.30.1.tar.gz
wget -c https://www.linuxfromscratch.org/patches/blfs/12.1/nss-3.98-standalone-1.patch
wget -c https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_98_RTM/src/nss-3.98-with-nspr-4.35.tar.gz
wget -c https://gitlab.freedesktop.org/mesa/mesa/-/archive/mesa-19.0.0/mesa-mesa-19.0.0.tar.gz
wget -c https://github.com/unicode-org/icu/releases/download/release-70-rc/icu4c-70rc-src.tgz
wget -c https://github.com/mm2/Little-CMS/archive/refs/tags/lcms2.10.tar.gz

2.5. 编译依赖

2.5.1. 前置条件

上述依赖库编译还需要本机编译工具，以下代码是下载需要的编译工具

# xkbcommon 编译环境
yum install bison
yum install python3
python3 -m pip install meson
python3 -m pip install ninja
python3 -m pip install mako

# dbus 编译环境
yum install flex
yum install libtool

# nss 编译环境
yum install tcl
yum install patch
yum install zlib-devel
# qt 实际编译需要本地的 nss
yum install nss

# fontconfig 编译环境
yum install gperf

2.5.2. 架构检测

相比于 arm64 架构，loongarch64 架构是 2022 年出的新架构，所以很多底层依赖库交叉编译时不支持，其中 libffi3.4.3 icu70 nspr4.35/nss3.98 支持 loongarch64。剩下的可以通过修改 config.sub 或 config.guess 进行自定义架构¹。

文件都放在 /cross/dependence

# config.sub
sudo wget -O config.sub "git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD"
# config.guess
sudo wget -O config.guess "git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD"

2.5.3. 编译依赖

文件都放在 /cross/dependence

xkbcommon glib mesa 是使用 meson 和 ninja 构建，所以需要编辑 cross-file。可能需要自行更改自己对应文件中编译相关目录。

编辑 loongarch64_xkbcommon.txt，内容如下：

[binaries]
c = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-gcc'
cpp = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-c++'
ar = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-ar'
strip = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-strip'
ld = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-ld'
pkgconfig = '/usr/bin/pkg-config'
 
[properties]
pkg_config_libdir = ['/loongarch64/lib/pkgconfig', '/loongarch64/share/pkgconfig']
skip_sanity_check = true
 
[paths]
libdir = '/loongarch64/lib'
includedir = '/loongarch64/include'
prefix = '/loongarch64'
 
[host_machine]
system = 'linux'
cpu_family = 'loongarch64'
cpu = 'loongarch64'
endian = 'little'
 
[build_machine]
system = 'linux'
cpu_family = 'x86_64'
cpu = 'i686'
endian = 'little'

编辑 loongarch64_glib.txt，内容如下：

[binaries]
c = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-gcc'
cpp = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-c++'
ar = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-ar'
strip = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-strip'
ld = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-ld'
pkgconfig = '/usr/bin/pkg-config'
 
[properties]
pkg_config_libdir = ['/loongarch64/lib/pkgconfig', '/loongarch64/share/pkgconfig']
skip_sanity_check = true

[paths]
libdir = '/loongarch64/lib'
includedir = '/loongarch64/include'
prefix = '/loongarch64'
 
[host_machine]
system = 'linux'
cpu_family = 'loongarch64'
cpu = 'loongarch64'
endian = 'little'
 
[build_machine]
system = 'linux'
cpu_family = 'x86_64'
cpu = 'i686'
endian = 'little'

编辑 loongarch64_mesa.txt，内容如下：

[binaries]
c = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-gcc'
cpp = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-c++'
ar = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-ar'
strip = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-strip'
ld = '/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-ld'
pkgconfig = '/usr/bin/pkg-config'
 
[properties]
pkg_config_libdir = ['/loongarch64/lib/pkgconfig', '/loongarch64/share/pkgconfig']
skip_sanity_check = true
 
[paths]
libdir = '/loongarch64/lib'
includedir = '/loongarch64/include'
prefix = '/loongarch64'
 
[host_machine]
system = 'linux'
cpu_family = 'loongarch64'
cpu = 'loongarch64'
endian = 'little'
 
[build_machine]
system = 'linux'
cpu_family = 'x86_64'
cpu = 'i686'
endian = 'little'

以下是编译依赖的脚本 loongarch64_dependence.sh，直接运行即可

#!/bin/sh
set -e

MY_PREFIX=/loongarch64
MY_HOST=loongarch64-linux-gnu

export PKG_CONFIG_PATH=${MY_PREFIX}/lib/pkgconfig:${MY_PREFIX}/share/pkgconfig
export C_INCLUDE_PATH=${MY_PREFIX}/include:$C_INCLUDE_PATH
export LD_LIBRARY_PATH=${MY_PREFIX}/lib:$LD_LIBRARY_PATH

export CFLAGS="$CFLAGS -I${MY_PREFIX}/include"
export LDFLAGS="$LDFLAGS -L${MY_PREFIX}/lib"
export LDFLAGS="$LDFLAGS -Wl,-rpath-link=${MY_PREFIX}/lib -Wl,-rpath-link=${MY_PREFIX}/lib64"
export LDFLAGS="$LDFLAGS -Wl,-rpath=${MY_PREFIX}/lib -Wl,-rpath=${MY_PREFIX}/lib64"

export CC=${MY_HOST}-gcc
export CXX=${MY_HOST}-g++

build_script_openssl() {
    ./Configure \
        linux-generic64 \
        --prefix=${MY_PREFIX}

    make -j4 && make install
}

build_script_xcb_common() {
    \cp ../config.sub ./

    ./configure \
        --prefix=${MY_PREFIX} \
        --host=${MY_HOST} \
        --enable-option-checking \
        --enable-malloc0returnsnull

    make -j4 && make install
}

build_script_x11() {
    ./configure \
        --prefix=${MY_PREFIX} \
        --host=${MY_HOST} \
        --enable-option-checking \
        --enable-unix-transport \
        --enable-tcp-transport \
        --enable-ipv6 \
        --enable-local-transport \
        --enable-malloc0returnsnull

    make -j4 && make install
}

build_script_xkbcommon() {
    meson setup build \
        --prefix ${MY_PREFIX} \
        --buildtype release \
        --cross-file ../loongarch64_xkbcommon.txt \
        -D enable-x11=true \
        -D enable-wayland=false \
        -D enable-docs=false \
        -D enable-xkbregistry=false \
        -D xkb-config-root=${MY_PREFIX}/lib/pkgconfig

    ninja -C build
    ninja -C build install
}

build_script_selinux() {
    export CC=${MY_HOST}-gcc
    export CXX=${MY_HOST}-g++
    export PREFIX=${MY_PREFIX}
    export SHLIBDIR=${MY_PREFIX}/lib
    make -j4 && make install
}

build_script_freetype() {
    ./configure \
        --prefix=${MY_PREFIX} \
        --host=${MY_HOST} \
        --with-zlib=no \
        --with-png=no \
        --enable-freetype-config

    make -j4 && make install
}

build_script_xml2() {
    ./configure \
        --prefix=${MY_PREFIX} \
        --host=${MY_HOST} \
        --with-zlib=no \
        --without-python

    make -j4 && make install
}

build_script_zlib() {
    ./configure \
        --prefix=${MY_PREFIX} \
        --shared \
        --static

    make -j4 && make install
}

build_script_glib() {
    meson setup build \
        --prefix ${MY_PREFIX} \
        --buildtype release \
        --cross-file ../loongarch64_glib.txt \
        -D libmount=false

    ninja -C build
    ninja -C build install
}

build_script_mesa() {
    export CFLAGS="-I${MY_PREFIX}/include/libdrm -I${MY_PREFIX}/include/libdrm/nouveau $CFLAGS"
    meson setup build \
        --prefix ${MY_PREFIX} \
        --buildtype release \
        --cross-file ../loongarch64_mesa.txt \
        -D gallium-drivers=nouveau,freedreno \
        -D dri-drivers="" \
        -D vulkan-drivers="" \
        -D platforms=x11

    ninja -C build
    ninja -C build install
}

build_script_icu() {
    mkdir $(pwd)/build
    cd $(pwd)/build
    ../runConfigureICU Linux/gcc
    make -j4
    cd ..

    ./configure \
        --prefix=${MY_PREFIX} \
        --host=${MY_HOST} \
        --with-cross-build=$(pwd)/build

    make -j4 && make install
}

build_openssl() {
    rm -rf openssl-1.1.1q
    tar -xvf openssl-1.1.1q.tar.gz
    cd openssl-1.1.1q
    build_script_openssl
    cd ..
}

build_xtrans() {
    rm -rf xtrans-1.4.0
    tar -xvf xtrans-1.4.0.tar.gz
    cd xtrans-1.4.0
    build_script_xcb_common
    cd ..
}

build_xcb_proto() {
    rm -rf xcb-proto-1.13
    tar -xvf xcb-proto-1.13.tar.gz
    cd xcb-proto-1.13
    build_script_xcb_common
    cd ..
}

build_xorgproto() {
    rm -rf xorgproto-2020.1
    tar -xvf xorgproto-2020.1.tar.gz
    cd xorgproto-2020.1
    build_script_xcb_common
    cd ..
}

build_Xau() {
    rm -rf libXau-1.0.9
    tar -xvf libXau-1.0.9.tar.gz
    cd libXau-1.0.9
    build_script_xcb_common
    cd ..
}

build_xcb() {
    rm -rf libxcb-1.13
    tar -xvf libxcb-1.13.tar.gz
    cd libxcb-1.13
    \cp ../config.sub ./build-aux/
    build_script_xcb_common
    cd ..
}

build_pthread() {
    rm -rf libpthread-stubs-0.4
    tar -xvf libpthread-stubs-0.4.tar.gz
    cd libpthread-stubs-0.4
    build_script_xcb_common
    cd ..
}

build_xcb_util() {
    rm -rf xcb-util-0.3.9
    tar -xvf xcb-util-0.3.9.tar.gz
    cd xcb-util-0.3.9
    build_script_xcb_common
    cd ..
}

build_xcb_util_image() {
    rm -rf xcb-util-image-0.3.9
    tar -xvf xcb-util-image-0.3.9.tar.gz
    cd xcb-util-image-0.3.9
    build_script_xcb_common
    cd ..
}

build_xcb_util_keysyms() {
    rm -rf xcb-util-keysyms-0.3.9
    tar -xvf xcb-util-keysyms-0.3.9.tar.gz
    cd xcb-util-keysyms-0.3.9
    build_script_xcb_common
    cd ..
}

build_xcb_util_renderutil() {
    rm -rf xcb-util-renderutil-0.3.9
    tar -xvf xcb-util-renderutil-0.3.9.tar.gz
    cd xcb-util-renderutil-0.3.9
    build_script_xcb_common
    cd ..
}

build_xcb_util_wm() {
    rm -rf xcb-util-wm-0.3.9
    tar -xvf xcb-util-wm-0.3.9.tar.gz
    cd xcb-util-wm-0.3.9
    build_script_xcb_common
    cd ..
}

build_util_macros() {
    rm -rf util-macros-1.19.3
    tar -xvf util-macros-1.19.3.tar.gz
    cd util-macros-1.19.3
    build_script_xcb_common
    cd ..
}

build_xrender() {
    rm -rf libXrender-0.9.10
    tar -xvf libXrender-0.9.10.tar.gz
    cd libXrender-0.9.10
    build_script_xcb_common
    cd ..
}

build_xext() {
    rm -rf libXext-1.3.4
    tar -xvf libXext-1.3.4.tar.gz
    cd libXext-1.3.4
    build_script_xcb_common
    cd ..
}

build_drm() {
    rm -rf libdrm-2.4.100
    tar -xvf libdrm-2.4.100.tar.gz
    cd libdrm-2.4.100
    \cp ../config.sub ./build-aux/
    build_script_xcb_common
    cd ..
}

build_xrandr() {
    rm -rf libXrandr-1.5.2
    tar -xvf libXrandr-1.5.2.tar.gz
    cd libXrandr-1.5.2
    build_script_xcb_common
    cd ..
}

build_xfixes() {
    rm -rf libXfixes-5.0.3
    tar -xvf libXfixes-5.0.3.tar.gz
    cd libXfixes-5.0.3
    build_script_xcb_common
    cd ..
}

build_xcomposite() {
    rm -rf libXcomposite-0.4.5
    tar -xvf libXcomposite-0.4.5.tar.gz
    cd libXcomposite-0.4.5
    build_script_xcb_common
    cd ..
}

build_xcursor() {
    rm -rf libXcursor-1.2.0
    tar -xvf libXcursor-1.2.0.tar.gz
    cd libXcursor-1.2.0
    build_script_xcb_common
    cd ..
}

build_xi() {
    rm -rf libXi-1.7.10
    tar -xvf libXi-1.7.10.tar.gz
    cd libXi-1.7.10
    build_script_xcb_common
    cd ..
}

build_xscrnsaver() {
    rm -rf libXScrnSaver-1.2.3
    tar -xvf libXScrnSaver-1.2.3.tar.gz
    cd libXScrnSaver-1.2.3
    build_script_xcb_common
    cd ..
}

build_xtst() {
    rm -rf libXtst-1.2.3
    tar -xvf libXtst-1.2.3.tar.gz
    cd libXtst-1.2.3
    build_script_xcb_common
    cd ..
}

build_xshmfence() {
    rm -rf libxshmfence-1.3
    tar -xvf libxshmfence-1.3.tar.gz
    cd libxshmfence-1.3
    build_script_xcb_common
    cd ..
}

build_xxf86vm() {
    rm -rf libXxf86vm-1.1.4
    tar -xvf libXxf86vm-1.1.4.tar.gz
    cd libXxf86vm-1.1.4
    build_script_xcb_common
    cd ..
}

build_xkeyboard() {
    rm -rf xkeyboard-config-2.30
    tar -xvf xkeyboard-config-2.30.tar.gz
    cd xkeyboard-config-2.30
    build_script_xcb_common
    cd ..
}

build_xkbcommon() {
    rm -rf libxkbcommon-1.4.0
    tar -xvf libxkbcommon-1.4.0.tar.xz
    cd libxkbcommon-1.4.0
    build_script_xkbcommon
    cd ..
}

build_ice() {
    rm -rf libICE-1.0.10
    tar -xvf libICE-1.0.10.tar.gz
    cd libICE-1.0.10
    build_script_xcb_common
    cd ..
}

build_sm() {
    rm -rf libSM-1.2.3
    tar -xvf libSM-1.2.3.tar.gz
    cd libSM-1.2.3
    build_script_xcb_common
    cd ..
}

build_x11() {
    rm -rf libX11-1.7.5
    tar -xvf libX11-1.7.5.tar.gz
    cd libX11-1.7.5
    build_script_x11
    cd ..
}

# glib
build_pcre() {
    rm -rf pcre-8.45
    tar -xvf pcre-8.45.tar.gz
    cd pcre-8.45
    build_script_xcb_common
    cd ..
}

build_zlib() {
    rm -rf zlib-1.2.11
    tar -xvf zlib-1.2.11.tar.gz
    cd zlib-1.2.11
    build_script_zlib
    cd ..
}

build_ffi() {
    rm -rf libffi-3.4.3
    tar -xvf libffi-3.4.3.tar.gz
    cd libffi-3.4.3
    build_script_xcb_common
    cd ..
}

build_glib() {
    rm -rf glib-2.61.3
    tar -xvf glib-2.61.3.tar.xz
    cd glib-2.61.3
    build_script_glib
    cd ..
}

# webengine
build_xkbfile() {
    rm -rf libxkbfile-1.1.0
    tar -xvf libxkbfile-1.1.0.tar.gz
    cd libxkbfile-1.1.0
    build_script_xcb_common
    cd ..
}

build_xdamage() {
    rm -rf libXdamage-1.1.5
    tar -xvf libXdamage-1.1.5.tar.gz
    cd libXdamage-1.1.5
    build_script_xcb_common
    cd ..
}

build_expat() {
    rm -rf expat-2.2.9
    tar -xvf expat-2.2.9.tar.gz
    cd expat-2.2.9
    \cp ../config.sub ./conftools/
    build_script_xcb_common
    cd ..
}

build_sepol() {
    rm -rf libsepol-3.0
    tar -xvf libsepol-3.0.tar.gz
    cd libsepol-3.0
    build_script_selinux
    cd ..
}

build_selinux() {
    rm -rf libselinux-3.0
    tar -xvf libselinux-3.0.tar.gz
    cd libselinux-3.0
    build_script_selinux
    cd ..
}

build_dbus() {
    rm -rf dbus-1.13.6
    tar -xvf dbus-1.13.6.tar.gz
    cd dbus-1.13.6
    \cp ../config.sub ./build-aux/
    build_script_xcb_common
    cd ..
}

build_freetype() {
    rm -rf freetype-2.10.1
    tar -xvf freetype-2.10.1.tar.gz
    cd freetype-2.10.1
    \cp ../config.sub ./builds/unix/
    build_script_freetype
    cd ..
}

build_xml2() {
    rm -rf libxml2-v2.9.9
    tar -xvf libxml2-v2.9.9.tar.gz
    cd libxml2-v2.9.9
    ./autogen.sh
    \cp ../config.sub ./
    build_script_xml2
    cd ..
}

build_uuid() {
    rm -rf libuuid-1.0.3
    tar -xvf libuuid-1.0.3.tar.gz
    cd libuuid-1.0.3
    build_script_xcb_common
    cd ..
}

build_fontconfig() {
    rm -rf fontconfig-2.13.92
    tar -xvf fontconfig-2.13.92.tar.gz
    cd fontconfig-2.13.92
    build_script_xcb_common
    cd ..
}

build_sqlite3() {
    rm -rf sqlite-version-3.30.1
    tar -xvf version-3.30.1.tar.gz
    cd sqlite-version-3.30.1
    build_script_xcb_common
    cd ..
}

build_mesa() {
    rm -rf mesa-mesa-19.0.0
    tar -xvf mesa-mesa-19.0.0.tar.gz
    cd mesa-mesa-19.0.0
    build_script_mesa
    cd ..
}

build_icu() {
    rm -rf icu
    tar -xvf icu4c-70rc-src.tgz
    cd icu/source
    \cp ../../config.sub ./
    build_script_icu
    cd ../..
}

build_lcms2() {
    rm -rf Little-CMS-lcms2.10
    tar -xvf lcms2.10.tar.gz
    cd Little-CMS-lcms2.10
    build_script_xcb_common
    cd ..
}

# openssl
build_openssl

# glib
build_pcre
build_zlib
build_ffi
build_sepol
build_selinux
build_glib

# x11
build_xtrans
build_xcb_proto
build_xorgproto
build_Xau
build_xcb
build_pthread
build_xcb_util
build_xcb_util_image
build_xcb_util_keysyms
build_xcb_util_renderutil
build_xcb_util_wm
build_util_macros
build_xkeyboard
build_drm
build_xshmfence
build_xkbcommon
build_ice
build_sm
build_x11

# webengine
build_xrender
build_xext
build_xrandr
build_xfixes
build_xcomposite
build_xcursor
build_xi
build_xscrnsaver
build_xtst
build_xxf86vm
build_xkbfile
build_xdamage
build_expat
build_dbus
build_freetype
build_xml2
build_uuid
build_fontconfig
build_sqlite3
build_mesa
build_icu
build_lcms2

2.5.4. nss交叉编译

webengine 模块需要用到 nss，nss 交叉编译比较麻烦，具体步骤参考linux交叉编译nss3,nspr-爱代码爱编程²。

• nss: https://ftp.mozilla.org/pub/security/nss/releases/

• patch: https://www.linuxfromscratch.org/patches/blfs/12.1/

以下列出需要用到的命令，下面脚本不能直接执行，以参考链接为准。

#!/bin/sh
MY_PREFIX=/usr/local
MY_PREFIX_CROSS=/loongarch64
MY_HOST=loongarch64-linux-gnu

# build_init() {c
#     rm -rf nss-3.98
#     tar -xvf nss-3.98-with-nspr-4.25.tar.gz
#     cd nss-3.98
#     patch -Np1 -i ../nss-3.98-standalone-1.patch
#     cp -rf nspr nspr_local
#     cp -rf nss nss_local
# }

build_script_nspr_local() {
    cd nspr_local

    sed -i '/^RELEASE/s|^|#|' pr/src/misc/Makefile.in
    sed -i 's|$(LIBRARY) ||' config/rules.mk

    ./configure \
        --with-pthreads \
        --enable-64bit \
        --with-mozilla

    make -j1 && make install
}

build_script_nspr() {
    cd nspr
    \cp ../../config.sub ./build/autoconf/

    sed -i '/^RELEASE/s|^|#|' pr/src/misc/Makefile.in
    sed -i 's|$(LIBRARY) ||' config/rules.mk

    ./configure \
        --prefix=${MY_PREFIX_CROSS} \
        --host=${MY_HOST} \
        --with-pthreads \
        --with-mozilla \
        --enable-64bit

    make -j1 && make install
    # cp ./nspr_local/config/nsinstall ./nspr/config/
}

build_script_nss_local() {
    cd nss_local

    make -j1 \
        BUILD_OPT=1 \
        NSPR_INCLUDE_DIR=${MY_PREFIX}/include/nspr \
        NSPR_LIB_DIR=${MY_PREFIX}/lib \
        USE_STATIC_RTL=1 \
        USE_SYSTEM_ZLIB=1 \
        ZLIB_LIBS=-lz \
        NSS_ENABLE_WERROR=0 \
        $([ -f ${MY_PREFIX}/include/sqlite3.h ] && echo NSS_USE_SYSTEM_SQLITE=1) \
        $([ $(uname -m) = x86_64 ] && echo USE_64=1)
}

build_script_nss() {
    cd nss

    export CC=${MY_HOST}-gcc
    export CCC=${MY_HOST}-g++
    export C_INCLUDE_PATH=${MY_PREFIX_CROSS}/include:$C_INCLUDE_PATH
    export LD_LIBRARY_PATH=${MY_PREFIX_CROSS}/lib:$LD_LIBRARY_PATH

    make -j1 \
        BUILD_OPT=1 \
        NSPR_INCLUDE_DIR=${MY_PREFIX_CROSS}/include/nspr \
        NSPR_LIB_DIR=${MY_PREFIX_CROSS}/lib \
        USE_STATIC_RTL=1 \
        USE_SYSTEM_ZLIB=1 \
        ZLIB_LIBS=-lz \
        NSS_ENABLE_WERROR=0 \
        $([ -f ${MY_PREFIX_CROSS}/include/sqlite3.h ] && echo NSS_USE_SYSTEM_SQLITE=1) \
        USE_64=1 \
        CROSS_COMPILE=1 \
        PREFIX=${MY_PREFIX_CROSS} \
        OS_TEST=loongarch64

    cd ..
    # cp ./nss_local/coreconf/nsinstall/Linux3.10_x86_64_cc_glibc_PTH_64_OPT.OBJ/nsinstall ./nss/coreconf/nsinstall/Linux3.10_loongarch64_glibc_PTH_64_OPT.OBJ/
}

install_nss() {
    cd ./dist/Linux3.10_loongarch64_glibc_PTH_64_OPT.OBJ

    install -v -m755 lib/*.so ${MY_PREFIX_CROSS}/lib
    install -v -m644 lib/{*.chk,libcrmf.a} ${MY_PREFIX_CROSS}/lib
    install -v -m755 -d ${MY_PREFIX_CROSS}/include/nss
    cp -v -RL ../{public,private}/nss/* ${MY_PREFIX_CROSS}/include/nss
    install -v -m755 bin/{certutil,nss-config,pk12util} ${MY_PREFIX_CROSS}/bin
    install -v -m644 lib/pkgconfig/nss.pc ${MY_PREFIX_CROSS}/lib/pkgconfig
    
    cd ..
}

# 编译 nss
# build_init
build_script_nspr_local
build_script_nspr

build_script_nss_local
build_script_nss

install_nss

2.5.5. nodejs下载

nodejs 不用交叉编译，下载创建链接即可。

# 下载 nodejs
wget -c https://registry.npmmirror.com/-/binary/node/v10.24.1/node-v10.24.1-linux-x64.tar.gz
tar -xvf node-v10.24.1-linux-x64.tar.gz
mv node-v10.24.1-linux-x64 /usr/local/nodejs
# 建立node npm软链接
ln -s /usr/local/nodejs/bin/node /usr/local/bin
ln -s /usr/local/nodejs/bin/npm /usr/local/bin

2.5.6. 检查编译³

文件都放在 /cross/dependence

以下脚本 check_dependence.sh 是检查是否能被检索到。

#!/bin/bash
PRE_PATH=/loongarch64

export PKG_CONFIG_PATH=${PRE_PATH}/lib/pkgconfig:${PRE_PATH}/share/pkgconfig

x11string="xrender,xcb-render,xcb-renderutil,xcb-shape,xcb-randr,xcb-xfixes,xcb-sync,xcb-shm,xcb-icccm,xcb-keysyms,xcb-image,xkbcommon,xkbcommon-x11,fontconfig,freetype2,xext,x11,xcb,x11-xcb,sm,ice,glib-2.0,xcb-xinerama"
x11array=(${x11string//,/ })

webstring="nss,libdrm,xcomposite,xcursor,xi,xrandr,xscrnsaver,xtst,xkbfile,expat,xdamage"
webarray=(${webstring//,/ })

allCount=0
successCount=0
failedStr=""

echo "X11依赖："
for var in ${x11array[@]}; do
    let allCount++
    modversion="$(pkg-config --modversion --silence-errors $var)"

    if [[ -n $modversion ]]; then
        let successCount++
        echo $var "库版本号" $modversion
    else
        failedStr=$failedStr$var,
        echo $var "未找到库！！！"
    fi
done

echo
echo "WebEngine依赖："
for var in ${webarray[@]}; do
    let allCount++
    modversion="$(pkg-config --modversion --silence-errors $var)"

    if [[ -n $modversion ]]; then
        let successCount++
        echo $var "库版本号" $modversion
    else
        failedStr=$failedStr$var,
        echo $var "未找到库！！！"
    fi
done

echo
echo "成功 / 总数："$successCount/$allCount
if [ $allCount -ne $successCount ]; then
    echo "未找到的库 ："$failedStr
fi

运行上述脚本全部找到应该就没问题。

3. 编译Qt

下载地址：https://download.qt.io/archive/qt/5.15/5.15.2/single/

首先解压，以后所有操作都在 /cross/loongarch64-qt-everywhere-src-5.15.2 中操作

tar -xvf qt-everywhere-src-5.15.2.tar.xz
mv qt-everywhere-src-5.15.2 loongarch64-qt-everywhere-src-5.15.2
cd loongarch64-qt-everywhere-src-5.15.2

3.1. 环境配置

loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3 中包含 sysroot，为了路径简短，直接复制到根目录。

cp -rf loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/loongarch64-linux-gnu/sysroot/ /sysroot-loongarch64

因为要配置 sysroot，所有查找路径都会加上 ${sysroot} 前缀，所以需要把上述所有依赖安装路径 loongarch64 文件夹拷贝到 sysroot-loongarch64 目录下。将原来 loongarch64 改名，不然 qt 后续编译 webengine 本地链接 nss 会找到这里面。

# 移动和改名
cp -rf /loongarch64 /sysroot-loongarch64/
mv /loongarch64 /loongarch641

# 或者直接移动
mv /loongarch64/ /sysroot-loongarch64/

不知道为什么 webengine 模块不能识别编译脚本中的 export，所以需要在 /etc/profile 设置

vim /etc/profile

# webengine
MY_SYSROOT=/sysroot-loongarch64
MY_PREFIX=${MY_SYSROOT}/loongarch64
export PKG_CONFIG_PATH=${MY_PREFIX}/lib/pkgconfig:${MY_PREFIX}/share/pkgconfig
export CPLUS_INCLUDE_PATH=$CPLUS_INCLUDE_PATH:${MY_PREFIX}/include
export CPLUS_INCLUDE_PATH=$CPLUS_INCLUDE_PATH:${MY_PREFIX}/include/nss
export CPLUS_INCLUDE_PATH=$CPLUS_INCLUDE_PATH:${MY_PREFIX}/include/nspr
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${MY_PREFIX}/lib

source /etc/profile

3.2. 添加交叉编译平台

所有默认的交叉编译平台配置文件在 /qt-everywhere-src-5.15.2/qtbase/mkspecs，为了不影响文件，可以复制 linux-aarch64-gnu-g++ 为 loongarch64-linux-gnu-g++ 作为我们的配置文件。并修改其中的 qmake.conf 文件如下：

#
# qmake configuration for building with aarch64-linux-gnu-g++
#

MAKEFILE_GENERATOR      = UNIX
CONFIG                 += incremental
QMAKE_INCREMENTAL_STYLE = sublib

include(../common/linux.conf)
include(../common/gcc-base-unix.conf)
include(../common/g++-unix.conf)

QMAKE_INCDIR_POST += \ 
    $$[QT_SYSROOT]/usr/include \
    $$[QT_SYSROOT]/loongarch64/include

QMAKE_RPATHLINKDIR_POST += \ 
    $$[QT_SYSROOT]/usr/lib \
    $$[QT_SYSROOT]/loongarch64/lib \
    $$[QT_SYSROOT]/loongarch64/lib64

# modifications to g++.conf
QMAKE_CC                = loongarch64-linux-gnu-gcc
QMAKE_CXX               = loongarch64-linux-gnu-g++
QMAKE_LINK              = loongarch64-linux-gnu-g++
QMAKE_LINK_SHLIB        = loongarch64-linux-gnu-g++

# modifications to linux.conf
QMAKE_AR                = loongarch64-linux-gnu-ar cqs
QMAKE_OBJCOPY           = loongarch64-linux-gnu-objcopy
QMAKE_NM                = loongarch64-linux-gnu-nm -P
QMAKE_STRIP             = loongarch64-linux-gnu-strip
load(qt_config)

3.3. qtwebengine

cd loongarch64-qt-everywhere-src-5.15.2/qtwebengine

qt5.15.2 该模块不支持 loongarch64 架构，需要下载补丁包。

# 源地址为：https://pkg.loongnix.cn/loongnix/pool/main/q/qtwebengine-opensource-src/

# 下载使用方法：
wget https://pkg.loongnix.cn/loongnix/pool/main/q/qtwebengine-opensource-src/qtwebengine-opensource-src_5.15.2+dfsg-lnd.3.dsc
wget https://pkg.loongnix.cn/loongnix/pool/main/q/qtwebengine-opensource-src/qtwebengine-opensource-src_5.15.2+dfsg.orig.tar.xz
wget https://pkg.loongnix.cn/loongnix/pool/main/q/qtwebengine-opensource-src/qtwebengine-opensource-src_5.15.2+dfsg-lnd.3.debian.tar.xz

# 解压源码方法： 这个命令 CentOS 没有
dpkg-source -x qtwebengine-opensource-src_5.15.2+dfsg-lnd.3.dsc

# 关于loongarch的patch位于：debian/patches目录下的0001-》0016前缀相关的都为loongarch相关patch。

直接解压 qtwebengine-opensource-src_5.15.2+dfsg-lnd.3.debian.tar.xz 即可，里面 debian/patches 包含全部补丁，全部打上即可。脚本 patches.sh 如下

#!/bin/sh
patch -Np1 -i debian/patches/0001-port-chromium_qt-to-loongarch64.patch
patch -Np1 -i debian/patches/0002-fix-third_party-for-loongarch64.patch
patch -Np1 -i debian/patches/0003-port-breakpad-for-loongarch64.patch
patch -Np1 -i debian/patches/0004-port-ffmpeg-to-loongarch64-for-chromium.patch
patch -Np1 -i debian/patches/0005-port-ffmpeg-to-loongarch64-for-chromium-add-la64-rel.patch
patch -Np1 -i debian/patches/0006-fix-third_party-for-loongarch64-add-files-for-la64.patch
patch -Np1 -i debian/patches/0007-port-icu-for-loongarch64.patch
patch -Np1 -i debian/patches/0008-port-lss-for-loongarch64.patch
patch -Np1 -i debian/patches/0009-port-pdfium-for-loongarch64.patch
patch -Np1 -i debian/patches/0010-port-swiftshader-for-loongarch64.patch
patch -Np1 -i debian/patches/0011-port-webrtc-for-loongarch64.patch
patch -Np1 -i debian/patches/0012-port-v8-for-loongarch64.patch
patch -Np1 -i debian/patches/0013-make-qtwebengine-can-be-compiled-for-loongarch64.patch
patch -Np1 -i debian/patches/0014-fix-compile-errors-for-mips64el.patch
patch -Np1 -i debian/patches/0015-fix-compiler-internal-error-for-loongarch64.patch
patch -Np1 -i debian/patches/0016-fix-compile-error-for-loongarch64.patch
patch -Np1 -i debian/patches/mipsel-code-range-size.patch
patch -Np1 -i debian/patches/mipsel-link-atomic.patch
patch -Np1 -i debian/patches/mipsel-linux-5.patch
patch -Np1 -i debian/patches/mipsel-no-dav1d.patch
patch -Np1 -i debian/patches/mipsel-ptrace-include.patch
patch -Np1 -i debian/patches/run-unbundling-script.patch
patch -Np1 -i debian/patches/sandbox-time64-syscalls.patch
patch -Np1 -i debian/patches/series
patch -Np1 -i debian/patches/system-icu-utf.patch
patch -Np1 -i debian/patches/system-lcms2.patch
patch -Np1 -i debian/patches/system-nspr-prtime.patch
patch -Np1 -i debian/patches/verbose-gn-bootstrap.patch

因为这是源码，所以有些补丁失败了，后面进行手动修改，使用配套 qt 应该没问题。

3.4. 编译脚本

为了不污染源代码，所以脚本 loongarch64_qt.sh 创建 build 文件夹进行编译。

#!/bin/sh
mkdir build_loongarch64
cd build_loongarch64

MY_SYSROOT=/sysroot-loongarch64
MY_PREFIX=${MY_SYSROOT}/loongarch64
MY_XPLATFORM=loongarch64-linux-gnu-g++

export PKG_CONFIG_LIBDIR=${MY_PREFIX}/lib/pkgconfig:${MY_PREFIX}/share/pkgconfig
export PKG_CONFIG_PATH=${MY_PREFIX}/lib/pkgconfig:${MY_PREFIX}/share/pkgconfig

../configure \
    -prefix /opt/qt5.15.2 \
    -confirm-license \
    -opensource \
    -release \
    -sysroot ${MY_SYSROOT} \
    -pkg-config \
    -xplatform ${MY_XPLATFORM} \
    -I${MY_PREFIX}/include \
    -L${MY_PREFIX}/lib \
    -make libs \
    -nomake examples \
    -nomake tools \
    -nomake tests \
    -xcb \
    -dbus \
    -fontconfig

cd ..

执行命令 ./loongarch64_qt.sh，看到以下情况即是包含 OpenSSL X11 QWebEngine，就可以开始编译。

cd build
# 编译
gmake -j4
# 安装，路径是 /sysroot-loongarch64/opt/qt5.15.2
gmake install

3.5. 问题

无关模块问题最好将 build 文件夹删除重新构建，不然基础上构建会导致部分头文件重复定义。

3.5.1. 问题一

QtWebEngine 架构不支持，qtwebengine/configure.pri 文件已经打上补丁

# 142
defineTest(qtConfTest_detectArch) {
    contains(QT_ARCH, "i386")|contains(QT_ARCH, "x86_64"): return(true)
    contains(QT_ARCH, "arm")|contains(QT_ARCH, "arm64"): return(true)
    contains(QT_ARCH, "mips")|contains(QT_ARCH, "mips64"): return(true)
    contains(QT_ARCH, "loongarch")|contains(QT_ARCH, "loongarch64"): return(true)
    qtLog("Architecture not supported.")
    return(false)
}

但是 loongarch64-linux-gnu-gcc 在 qt 进行代码测试时获取不到架构名称，需要直接指定，直接修改 /qtbase/configure.pri

# 983
defineTest(qtConfOutput_architecture) {
    #arch = $$qtConfEvaluate("tests.architecture.arch")
    arch = loongarch64
    subarch = $$qtConfEvaluate('tests.architecture.subarch')
    #buildabi = $$qtConfEvaluate("tests.architecture.buildabi")
    buildabi = loongarch64-linux-gnu

    $$qtConfEvaluate("features.cross_compile") {
        host_arch = $$qtConfEvaluate("tests.host_architecture.arch")
        host_buildabi = $$qtConfEvaluate("tests.host_architecture.buildabi")

        privatePro = \
            "host_build {" \
            "    QT_CPU_FEATURES.$$host_arch = $$qtConfEvaluate('tests.host_architecture.subarch')" \
            "} else {" \
            "    QT_CPU_FEATURES.$$arch = $$subarch" \
            "}"
        publicPro = \
            "host_build {" \
            "    QT_ARCH = $$host_arch" \
            "    QT_BUILDABI = $$host_buildabi" \
            "    QT_TARGET_ARCH = $$arch" \
            "    QT_TARGET_BUILDABI = $$buildabi" \
            "} else {" \
            "    QT_ARCH = $$arch" \
            "    QT_BUILDABI = $$buildabi" \
            "}"

    } else {
        privatePro = \
            "QT_CPU_FEATURES.$$arch = $$subarch"
        publicPro = \
            "QT_ARCH = $$arch" \
            "QT_BUILDABI = $$buildabi"
    }

    $${currentConfig}.output.publicPro += $$publicPro
    export($${currentConfig}.output.publicPro)
    $${currentConfig}.output.privatePro += $$privatePro
    export($${currentConfig}.output.privatePro)

    # setup QT_ARCH and QT_CPU_FEATURES variables used by qtConfEvaluate
    QT_ARCH = $$arch
    export(QT_ARCH)
    QT_CPU_FEATURES.$$arch = $$subarch
    export(QT_CPU_FEATURES.$$arch)
}

3.5.2. 问题二

#error Target architecture was not detected as supported by Double-Conversion.

未打上补丁地方之一，在 ./qtbase/src/3rdparty/double-conversion/include/double-conversion/utils.h 修改

// 96
defined(__mips__) || \
// 改为
defined(__mips__) || defined(__loongarch__) || \

3.5.3. 问题三

/cross/loongarch64-qt-everywhere-src-5.15.2/qtscript/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSValue.h:493:57: error: cast from 'QTJSC::JSCell*' to 'int32_t' {aka 'int'} loses precision [-fpermissive]
         u.asBits.payload = reinterpret_cast<int32_t>(ptr);

根据提示修改 /qtscript/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSValue.h 中 int32_t 改为 int64_t。

// 493
u.asBits.payload = reinterpret_cast<int64_t>(ptr);
// 505
u.asBits.payload = reinterpret_cast<int64_t>(const_cast<JSCell*>(ptr));

3.5.4. 问题四

ERROR at //build/config/posix/BUILD.gn:37:11: Script returned non-zero exit code.
          exec_script("//build/linux/sysroot_scripts/install-sysroot.py",

这个是没有对应的架构适配，直接修改 /qtwebengine/src/3rdparty/chromium/build/linux/sysroot_scripts/install-sysroot.py添加 la64 相关信息

# 44
VALID_ARCHS = ('arm', 'arm64', 'i386', 'amd64', 'mips', 'mips64el', 'la64')

ARCH_TRANSLATIONS = {
    'x64': 'amd64',
    'x86': 'i386',
    'mipsel': 'mips',
    'mips64': 'mips64el',
    'la64': 'mips64el',
}

3.5.5. 问题五

FAILED: obj/third_party/dav1d/dav1d/cdf.o 
/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin/loongarch64-linux-gnu-gcc -MMD -MF obj/third_party/dav1d/dav1d/cdf.o.d -DUSE_UDEV -DUSE_AURA=1 -DUSE_NSS_CERTS=1 -DUSE_OZONE=1 -DOFFICIAL_BUILD -DTOOLKIT_QT -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -DNO_UNWIND_TABLES -DCR_SYSROOT_HASH=4c1f3e3f4a11f820e152faffc49ccdfa1c435cc0 -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DCONFIG_LOG=0 -DDAV1D_API= -DCONFIG_LOG=0 -DDAV1D_API= -Igen -I../../../../../qtwebengine/src/3rdparty/chromium -I../../../../../qtwebengine/src/3rdparty/chromium/third_party/dav1d/libdav1d -I../../../../../qtwebengine/src/3rdparty/chromium/third_party/dav1d/libdav1d/include -I../../../../../qtwebengine/src/3rdparty/chromium/third_party/dav1d/libdav1d/include/dav1d -I../../../../../qtwebengine/src/3rdparty/chromium/third_party/dav1d/config/linux/la64 -I../../../../../qtwebengine/src/3rdparty/chromium/third_party/dav1d/version -I../../../../../qtwebengine/src/3rdparty/chromium/third_party/dav1d/version -D_FILE_OFFSET_BITS=64 -D_POSIX_C_SOURCE=200112L -std=c99 -D_GNU_SOURCE -mcmodel=large -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -fno-unwind-tables -fno-asynchronous-unwind-tables -fPIC -pipe -pthread -O2 -fno-ident -fdata-sections -ffunction-sections -fno-omit-frame-pointer -g0 -fvisibility=hidden -Wno-unused-local-typedefs -Wno-maybe-uninitialized -Wno-deprecated-declarations -fno-delete-null-pointer-checks -Wno-comments -Wno-packed-not-aligned -Wno-dangling-else -Wno-missing-field-initializers -Wno-unused-parameter -std=gnu11 --sysroot=../../../../../../../sysroot-loongarch64 -c ../../../../../qtwebengine/src/3rdparty/chromium/third_party/dav1d/libdav1d/src/cdf.c -o obj/third_party/dav1d/dav1d/cdf.o
../../../../../qtwebengine/src/3rdparty/chromium/third_party/dav1d/libdav1d/src/cdf.c:28:10: fatal error: config.h: No such file or directory
 #include "config.h"
          ^~~~~~~~~~
compilation terminated.

未打上补丁地方之一，loongarch64 不支持 dav1d，修改 /qtwebengine/src/3rdparty/chromium/media/media_options.gni

// 96
enable_dav1d_decoder = !is_android && !is_ios && target_cpu != "mips64el" && target_cpu != "mipsel" && target_cpu != "la64"

3.5.6. 问题六

../../../../../qtwebengine/src/3rdparty/chromium/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc:47:10: fatal error: asm/ptrace-abi.h: No such file or directory
 #include <asm/ptrace-abi.h>

未打上补丁地方之一，修改 /qtwebengine/src/3rdparty/chromium/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc

// 44
#if defined(__mips__) || defined(__loongarch64)

4. 验证

经过上述步骤就能获得 loongarch64 版本的 qt5.15.2，接下来是验证是否可以将程序编译成 loongarch64 版本，主要验证 webengine 模块功能。

下载安装 qt-opensource-linux-x64-5.14.2.run 最后一个离线安装版本：https://download.qt.io/archive/qt/5.14/5.14.2/。

添加交叉编译版本 qmake 路径，不然不能加载

vim /etc/profile

# qmake-loongarch64
export PATH=$PATH:/sysroot-loongarch64/opt/qt5.15.2/bin

source /etc/profile

4.1. 添加构建环境

在工具——选项——Kits——Qt Versions中点击添加，选择交叉编译生成的 qmake，配置了环境变量交叉编译器一般会自动加入。

然后在构建套件中添加一个交叉编译 loongarch64 版本，参数如下：

使用 simplebrowser.pro 示例进行测试。可以看到最终编译结果没有版本显示，但是实际就是 loongarch64

• 在对应平台查看可能显示 unknown arch 0x102，这是因为 LoongArch 的二进制编号为 258(0x102)
• 较新的 file 命令才添加了对 LoongArch 的支持。

5. 总结

5.1. /etc/profile

最后 /etc/profile 文件如下：

# gcc，放前面覆盖原始 gcc 路径
export PATH=/usr/local/gcc/bin:$PATH
export LD_LIBRARY_PATH=/usr/local/gcc/lib64:$LD_LIBRARY_PATH
# gcc-loongarch64
export PATH=$PATH:/cross/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.3/bin

# webengine
MY_SYSROOT=/sysroot-loongarch64
MY_PREFIX=${MY_SYSROOT}/loongarch64
export PKG_CONFIG_PATH=${MY_PREFIX}/lib/pkgconfig:${MY_PREFIX}/share/pkgconfig
export CPLUS_INCLUDE_PATH=$CPLUS_INCLUDE_PATH:${MY_PREFIX}/include
export CPLUS_INCLUDE_PATH=$CPLUS_INCLUDE_PATH:${MY_PREFIX}/include/nss
export CPLUS_INCLUDE_PATH=$CPLUS_INCLUDE_PATH:${MY_PREFIX}/include/nspr
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${MY_PREFIX}/lib

# qmake-loongarch64
export PATH=$PATH:${MY_SYSROOT}/opt/qt5.15.2/bin

参考

1. 交叉编译之LoongArch(Makefile,CMake,AutoTool等方式)  ↩︎

2. linux交叉编译nss3,nspr-爱代码爱编程 ↩︎

3. Aarch64(arm64)下编译QT5.15.5（xcb、webengine）+QTCreator4.13.3 ↩︎