cross-compile-qt-sources

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Desc

qt-everywhere-opensource-src-5.9.8.tar.xz是源码包，可编译出qmake工具，用于交叉编译 QT 程序，适用于交叉编译 QT 程序以放入开发板运行。
qt-opensource-linux-x64-5.9.8.run是 linux 程序，执行安装出 QtCreator 和 x86_64 的 qmake 程序，适用于在 linux 系统上开发 QT。

Env

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export PATH=$PATH:$HOME/sysroots/x86_64-linux/usr/bin/arm-oe-linux-gnueabi
export SYSROOT_PATH=$HOME/sysroots/mdm9607

Depends

由于下面的编译步骤依赖了freetype和tslib两个库，所以需要提前编译该依赖库。
编译步骤可参考：this

Build

cd $HOME/qt-everywhere-opensource-src-5.9.8/qtbase/mkspecs/
cp -rf linux-arm-gnueabi-g++ arm-oe-linux-gnueabi-g++

arm-oe-linux-gnueabi-g++/qmake.conf
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--- a/qmake.conf
+++ b/qmake.conf
@@ -11,14 +11,14 @@
 include(../common/g++-unix.conf)

 # modifications to g++.conf
-QMAKE_CC                = arm-linux-gnueabi-gcc
-QMAKE_CXX               = arm-linux-gnueabi-g++
-QMAKE_LINK              = arm-linux-gnueabi-g++
-QMAKE_LINK_SHLIB        = arm-linux-gnueabi-g++
+QMAKE_CC                = arm-oe-linux-gnueabi-gcc
+QMAKE_CXX               = arm-oe-linux-gnueabi-g++
+QMAKE_LINK              = arm-oe-linux-gnueabi-g++
+QMAKE_LINK_SHLIB        = arm-oe-linux-gnueabi-g++

 # modifications to linux.conf
-QMAKE_AR                = arm-linux-gnueabi-ar cqs
-QMAKE_OBJCOPY           = arm-linux-gnueabi-objcopy
-QMAKE_NM                = arm-linux-gnueabi-nm -P
-QMAKE_STRIP             = arm-linux-gnueabi-strip
+QMAKE_AR                = arm-oe-linux-gnueabi-ar cqs
+QMAKE_OBJCOPY           = arm-oe-linux-gnueabi-objcopy
+QMAKE_NM                = arm-oe-linux-gnueabi-nm -P
+QMAKE_STRIP             = arm-oe-linux-gnueabi-strip
 load(qt_config)
$HOME/qt-everywhere-opensource-src-5.9.8/
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./configure \
-prefix $HOME/.local \
-extprefix $HOME/.local \
-examplesdir $HOME/.local/qtexamples \
-confirm-license \
-opensource \
-shared \
-release  \
-make libs \
-xplatform arm-oe-linux-gnueabi-g++ \
-sysroot $SYSROOT_PATH \
-gcc-sysroot \
-optimized-qmake \
-system-freetype \
-pch \
-qt-libjpeg \
-qt-libpng \
-qt-zlib \
-no-opengl \
-no-sse2 \
-no-openssl \
-no-cups \
-no-glib \
-no-dbus \
-no-xcb \
-no-separate-debug-info \
-no-fontconfig \
-nomake tools \
-nomake tests \
-no-iconv \
-compile-examples \
-tslib \
-I$SYSROOT_PATH/include \
-I$SYSROOT_PATH/include/freetype2 \
-L$SYSROOT_PATH/lib

make && make install (这里-extprefix 才是实际安装的路径, -prefix 可以指定跟-extprefix 一致)

Runtime Env

下面是运行时的一些环境变量，仅供参考

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export LD_LIBRARY_PATH=/cache/qt5/lib:/cache/install/lib:/usr/lib:/lib:$LD_LIBRARY_PATH
export QT_DEBUG_PLUGINS=0
export QT_QPA_FONTDIR=/cache/qt5/font
export QT_QPA_PLATFORM_PLUGIN_PATH=/cache/qt5/plugins/
export QT_QPA_PLATFORM=linuxfb:fb=/dev/fb0:size=320x240:mmSize=320x240:offset=0x0:tty=/dev/tty0
export QT_QPA_GENERIC_PLUGINS=evdevtouch:/dev/input/event1
export QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=/dev/input/event1:rotate=0
export QT_QPA_FB_TSLIB=1
export TSLIB_TSDEVICE=/dev/input/event1
export TSLIB_CALIBFILE=/cache/pointercal
export TSLIB_CONFFILE=/cache/ts.conf
export TSLIB_PLUGINDIR=/cache/install/lib/ts
export TSLIB_CONSOLEDEVICE=none
export TSLIB_FBDEVICE=/dev/fb0
export LD_PRELOAD=/cache/install/lib/libts.so