qt交叉编译

### qt版本下载
https://download.qt.io/new_archive/qt/5.6/5.6.1/
### 解压修改配置
* 7z x qt-everywhere-opensource-src-5.6.1.7z
* cd qt-everywhere-opensource-src-5.6.1/
*cp qtbase/mkspecs/linux-arm-gnueabi-g++ qtbase/mkspecs/linux-aarch64-gnu-g++
* vi qtbase/mkspecs/linux-aarch64-gnu-g++/qmake.conf
```
#
# qmake configuration for building with arm-linux-gnueabi-g++
#

MAKEFILE_GENERATOR      = UNIX
CONFIG                 += incremental
QMAKE_INCREMENTAL_STYLE = sublib

QT_QPA_DEFAULT_PLATFORM = linuxfb
QMAKE_CFLAGS_RELEASE += -O2 -march=armv8-a -lts
QMAKE_CXXFLAGS_RELEASE += -O2 -march=armv8-a -lts

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

# modifications to g++.conf
QMAKE_CC                = aarch64-linux-gnu-gcc
QMAKE_CXX               = aarch64-linux-gnu-g++
QMAKE_LINK              = aarch64-linux-gnu-g++
QMAKE_LINK_SHLIB        = aarch64-linux-gnu-g++

# modifications to linux.conf
QMAKE_AR                = aarch64-linux-gnu-ar cqs
QMAKE_OBJCOPY           = aarch64-linux-gnu-objcopy
QMAKE_NM                = aarch64-linux-gnu-nm -P
QMAKE_STRIP             = aarch64-linux-gnu-strip
load(qt_config)
```

### 编译脚本
auto.sh

```
#!/bin/sh
./configure \
-prefix /opt/qt5.6.1-arm64 \
-confirm-license \
-opensource \
-release \
-make libs \
-xplatform linux-aarch64-gnu-g++ \
-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 
```
### 编译安装
make
make install

### 环境
- export QTEDIR=/home/kylin/qt5.9.1-arm64
- export LD_LIBRARY_PATH=/home/kylin/qt5.9.1-arm64/lib:$LD_LIBRARY_PATH
- export QT_QPA_PLATFORM_PULGIN_PATH=$QTEDIR/plugins
- export QT_QPA_PLATFORM=linuxfb
- export QT_QPA_FONTDIR=/usr/share/fonts/truetype/droid