一、环境

HOST：ubuntu12.04-LTS

Embedded：freescale imx6 linux-3.0.35

CROSS_COMPILE：freescale提供的gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-

二、下载源码

http://mirrors.ustc.edu.cn/qtproject/archive/qt/5.5/5.5.1/single/qt-everywhere-opensource-src-5.5.1.tar.gz

三、解压

unzip qt-everywhere-opensource-src-5.5.1.tar.gz

cd qt-everywhere-opensource-src-5.5.1

四、指定arm架构、交叉编译器、包含的文件系统头文件、部分编译参数

vi qtbase/mkspecs/devices/linux-imx6-g++/qmake.conf

以下为全部内容，其他平台qtbase/mkspecs/devices/下要是没有单独提供，可以使用qtbase/mkspecs/linux-arm-gnueabi-g++/qmake.conf，需根据自己平台做相应修改。

#
# qmake configuration for the Freescale iMX6 boards (single, dual and quad)
#
#export CROSS_COMPILE=/opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-
MAKEFILE_GENERATOR      = UNIX   #宏定义，代码中有判断
CONFIG                 += incremental
QMAKE_INCREMENTAL_STYLE = sublib
QT_QPA_DEFAULT_PLATFORM = linuxfb #eglfs    #显示使用linuxfb或eglfs
IMX6_CFLAGS             = -march=armv7-a -mfpu=neon -DLINUX=1 -DEGL_API_FB=1    #处理器架构
IMX6_CFLAGS_RELEASE     = -O2 $$IMX6_CFLAGS
QMAKE_CFLAGS_RELEASE   += $$IMX6_CFLAGS_RELEASE
QMAKE_CXXFLAGS_RELEASE += $$IMX6_CFLAGS_RELEASE
QMAKE_CFLAGS           += $$IMX6_CFLAGS
QMAKE_CXXFLAGS         += $$IMX6_CFLAGS
include(../common/linux_device_pre.conf)
include(../../common/linux.conf)
include(../../common/gcc-base-unix.conf)
include(../../common/g++-unix.conf)
# modifications to g++.conf
QMAKE_CC                = /opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-gcc
QMAKE_CXX               = /opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-g++
QMAKE_LINK              = /opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-g++
QMAKE_LINK_SHLIB        = /opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-g++
# modifications to linux.conf
QMAKE_AR                = /opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-ar cqs
QMAKE_OBJCOPY           = /opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-objcopy
QMAKE_STRIP             = /opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-strip
QMAKE_INCDIR            += /imx_disk/gq/qt/rootfs/usr/include
QMAKE_LIBDIR            += /imx_disk/gq/qt/rootfs/usr/lib
QMAKE_INCDIR            += /imx_disk/gq/qt/rootfs/usr/include/dbus-1.0
QMAKE_INCDIR            += /imx_disk/gq/qt/rootfs/usr/lib/dbus-1.0/include
QMAKE_LIBDIR            += /imx_disk/gq/qt/rootfs/usr/lib
QMAKE_INCDIR_OPENGL_ES2 = /imx_disk/gq/qt/rootfs/usr/include
QMAKE_LIBDIR_OPENGL_ES2 = /imx_disk/gq/qt/rootfs/usr/lib
QMAKE_INCDIR_EGL = /imx_disk/gq/qt/rootfs/usr/include
QMAKE_LIBDIR_EGL = /imx_disk/gq/qt/rootfs/usr/lib
QMAKE_LIBS_OPENGL_ES1       += -lGLESv1_CM -lEGL -lGAL
QMAKE_LIBS_OPENGL_ES1CL     += -lGLES_CL -lEGL -lGAL
QMAKE_LIBS_EGL         += -lEGL
QMAKE_LIBS_OPENGL_ES2  += -lGLESv2 -lEGL -lGAL
QMAKE_LIBS_OPENVG      += -lOpenVG -lEGL -lGAL
QMAKE_LIBS             += -ljpeg -ldbus-1 -lrt -lpthread    #编译选项
#DISTRO_OPTS += hard-float          #浮点运算使用软件不使用硬件
# Preferred eglfs backend
EGLFS_DEVICE_INTEGRATION = eglfs_viv
include(../common/linux_arm_device_post.conf)
load(qt_config)

五、根据自己实际需求配置QT

#!/bin/sh
./configure \
-v -opensource -confirm-license -no-pch -no-xcb -no-openssl -no-opengl -opengl es2 \
-dbus \
-qt-zlib \
-no-sse2 \
-no-iconv \
-tslib \
-release \
-make libs -device imx6 \
-device-option CROSS_COMPILE=/opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi- \
-sysroot /imx_disk/gq/qt/ -no-gcc-sysroot \
-prefix /qt5.5.1 \
-make examples -nomake tools -nomake tests

配置结果如下：

Build options:
Configuration .......... accessibility alsa audio-backend c++11 clock-gettime clock-monotonic compile_examples concurrent cross_compile dbus eglfs_viv enable_new_dtags evdev eventfd freetype full-config getaddrinfo getifaddrs harfbuzz inotify ipv6ifname large-config largefile linuxfb medium-config minimal-config mremap neon nis no-pkg-config opengl opengles2 openvg pcre png posix_fallocate qpa qpa reduce_exports release rpath shared small-config system-jpeg tslib zlib
Build parts ............  libs examples
Mode ................... release
Using sanitizer(s)...... none
Using C++11 ............ yes
Using gold linker....... no
Using new DTAGS ........ yes
Using PCH .............. no
Target compiler supports:
Neon ................. yes
Qt modules and options:
Qt D-Bus ............... yes (loading dbus-1 at runtime)
Qt Concurrent .......... yes
Qt GUI ................. yes
Qt Widgets ............. yes
Large File ............. yes
QML debugging .......... yes
Use system proxies ..... no
Support enabled for:
Accessibility .......... yes
ALSA ................... yes
CUPS ................... no
Evdev .................. yes
FontConfig ............. no
FreeType ............... yes (bundled copy)
Glib ................... no
GStreamer .............. no
GTK theme .............. no
HarfBuzz ............... yes (bundled copy)
Iconv .................. no
ICU .................... no
Image formats:
GIF .................. yes (plugin, using bundled copy)
JPEG ................. yes (plugin, using system library)
PNG .................. yes (in QtGui, using bundled copy)
journald ............... no
libinput................ no
mtdev .................. no
Networking:
getaddrinfo .......... yes
getifaddrs ........... yes
IPv6 ifname .......... yes
libproxy.............. no
OpenSSL .............. no
NIS .................... yes
OpenGL / OpenVG:
EGL .................. no
OpenGL ............... yes (OpenGL ES 2.0+)
OpenVG ............... yes-auto
PCRE ................... yes (bundled copy)
pkg-config ............. no
PulseAudio ............. no
QPA backends:
DirectFB ............. no
EGLFS ................ no
EGLFS i.MX6....... . yes
EGLFS KMS .......... no
EGLFS Mali ......... no
EGLFS Raspberry Pi . no
EGLFS X11 .......... no
LinuxFB .............. yes
XCB .................. no
Session management ..... yes
SQL drivers:
DB2 .................. no
InterBase ............ no
MySQL ................ no
OCI .................. no
ODBC ................. no
PostgreSQL ........... no
SQLite 2 ............. no
SQLite ............... yes (plugin, using bundled copy)
TDS .................. no
tslib .................. yes
udev ................... no
xkbcommon-x11........... no
xkbcommon-evdev......... no
zlib ................... yes (bundled copy)

六、编译安装

1、make

2、make install

七、copy到开发板设置环境变量

1、将qt5.5.1打包拷贝到文件系统/usr/local/下，其中包含了qt5的examples，可以删除。

2、添加QT系统环境变量

vi /etc/profile添加
#for QT
export QT_ROOT=/usr/local/qt5.5.1
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/lib:/usr/lib:$QT_ROOT/lib
export QT_QPA_PLATFORM_PLUGIN_PATH=$QT_ROOT/plugins
export QT_QPA_PLATFORM=linuxfb:tty=/dev/fb0
export QT_QPA_FONTDIR=$QT_ROOT/lib/fonts
export QT_QPA_GENERIC_PLUGINS=evdevtouch:/dev/input/event0
export PATH=/bin:/sbin:/usr/bin/:/usr/sbin

export QML2_IMPORT_PATH=$QT_ROOT/qml

#export QT_QPA_GENERIC_PLUGINS=tslib:$TSLIB_TSDEVICE//如果触摸使用TSlib支持则修改为该句。

#export QT_QPA_EGLFS_FB=/dev/fb1

注：QT触摸屏支持可以不使用tslib。

3、tslib移植及支持请看http://blog.csdn.net/xishuang_gongzi/article/details/49422879

八、运行例子

注：图懒得截了，从别人处拷贝的。

examples/touch/pinchzoom/pinchzoom

examples/svg/embedded/fluidlauncher/fluidlauncher

九、编译及运行问题记录

1、编译错误：opengles2.cpp:37:25: fatal error: GLES2/gl2.h: No such file or directory

vi qtbase/mkspecs/devices/linux-imx6-g++/qmake.conf

解决：

QMAKE_INCDIR_OPENGL_ES2 = /imx_disk/gq/qt/rootfs/usr/include
QMAKE_LIBDIR_OPENGL_ES2 = /imx_disk/gq/qt/rootfs/usr/lib

2、编译错误：In function `png_reset_crc': png.c: undefined reference to `z_crc32'等，qtbase/src/3rdparty/libpng编译时出现大量z_开头的zlib库函数找不到定义。

解决：

./configure 后添加编译-qt-zlib
qt为了防止自己的zlib库与系统的zlib库冲突。Since Qt Core must export these symbols, define Z_PREFIX to avoid clashes system zlib */

3、编译错误：

运行时出现错误提示

QIconvCodec::convertToUnicode: using Latin-1 for conversion,iconv_open failed
QIconvCodec::convertFromUnicode: using Latin-1 for conversion,iconv_open failed
解决：

./configure 后添加编译 -no-iconv

4、编译错误qtwebkit/lib/libQt5WebKit.so: undefined reference to `jpeg_input_complete'

解决：

./configure 后添加编译-qt-libjpeg

5、编译错误：arm-fsl-linux-gnueabi/bin/ld: warning: libjpeg.so.62, needed by /.....qtwebkit/lib/libQt5WebKit.so, not found (try using -rpath or -rpath-link)

解决：
vi qtbase/mkspecs/devices/linux-imx6-g++/qmake.conf添加
QMAKE_LIBS             += -ljpeg
http://blog.sina.com.cn/s/blog_616fb0880100xrjj.html

6、编译错误：

qibusplatforminputcontext.cpp: In member function 'virtual void QIBusPlatformInputContext::reset()':
qibusplatforminputcontext.cpp:117:17: error: 'class QIBusInputContextProxy' has no member named 'Reset'
qibusplatforminputcontext.cpp: In member function 'virtual void QIBusPlatformInputContext::commit()':
qibusplatforminputcontext.cpp:140:17: error: 'class QIBusInputContextProxy' has no member named 'Reset'

解决：

qt编译./configuer 后加上-dbus

7、配置错误：

The Qt D-Bus module cannot be enabled because libdbus-1 version 1.2 was not found.
解决：

参考:找到-prefix目录下的lib文件下的pkgconfig文件夹，打开dbus-1.pc
vi qtbase/mkspecs/devices/linux-imx6-g++/qmake.conf

QMAKE_INCDIR            += /imx_disk/gq/qt/rootfs/usr/include/dbus-1.0
QMAKE_INCDIR            += /imx_disk/gq/qt/rootfs/usr/lib/dbus-1.0/include
QMAKE_LIBDIR            += /imx_disk/gq/qt/rootfs/usr/lib

若rootfs中没有dbus库，则需要移植dbus1.2版本copy到文件系统，添加参数如下

QMAKE_INCDIR            += /imx_disk/gq/qt/dbus/dbusinstall_1.2.30/include/dbus-1.0
QMAKE_INCDIR            += /imx_disk/gq/qt/dbus/dbusinstall_1.2.30/lib/dbus-1.0/include
QMAKE_LIBDIR            += /imx_disk/gq/qt/dbus/dbusinstall_1.2.30/lib
其中dbusinstall_1.2.30是交叉编译dbus1.2后的安装目录。
编译dbus前需要先交叉编译dbus的依赖库expat-2.1.0

8、运行错误./examples/touch/pinchzoom/pinchzoom 
Cannot find libdbus-1 in your system to resolve symbol 'dbus_get_local_machine_id'.
Aborted
qt编译./configuer 后加上-dbus

9、编译错误：

/imx_disk/gq/qt/dbus/dbusinstall_1.2.30/lib/libdbus-1.a(dbus-sysdeps-pthread.o): In function `_dbus_pthread_condvar_wait_timeout':
/imx_disk/gq/qt/dbus/dbus-1.2.30/dbus/dbus-sysdeps-pthread.c:273: undefined reference to `clock_gettime'
/imx_disk/gq/qt/dbus/dbusinstall_1.2.30/lib/libdbus-1.a(dbus-sysdeps-pthread.o): In function `_dbus_pthread_condvar_new':
/imx_disk/gq/qt/dbus/dbus-1.2.30/dbus/dbus-sysdeps-pthread.c:206: undefined reference to `pthread_condattr_setclock'
/imx_disk/gq/qt/dbus/dbusinstall_1.2.30/lib/libdbus-1.a(dbus-sysdeps-pthread.o): In function `check_monotonic_clock':
/imx_disk/gq/qt/dbus/dbus-1.2.30/dbus/dbus-sysdeps-pthread.c:353: undefined reference to `clock_getres'
/imx_disk/gq/qt/dbus/dbusinstall_1.2.30/lib/libdbus-1.a(dbus-sysdeps-unix.o): In function `_dbus_get_current_time':
/imx_disk/gq/qt/dbus/dbus-1.2.30/dbus/dbus-sysdeps-unix.c:2071: undefined reference to `clock_gettime'

解决：
vi qtbase/mkspecs/devices/linux-imx6-g++/qmake.conf
QMAKE_LIBS             += -lrt

10、编译错误：

qsgvivantevideonode.cpp: In static member function 'static const QMap<QVideoFrame::PixelFormat, unsigned int>& QSGVivanteVideoNode::getVid   eoFormat2GLFormatMap()':
qsgvivantevideonode.cpp:64:77: error: 'GL_VIV_I420' was not declared in this scope

解决：方式两种，选一种，我们选第二种
①、
vi ./qtmultimedia/src/plugins/videonode/imx6/qsgvivantevideonode.cpp
const QMap<QVideoFrame::PixelFormat, GLenum>& QSGVivanteVideoNode::getVideoFormat2GLFormatMap()
{
    if (static_VideoFormat2GLFormatMap.isEmpty()) {
//        static_VideoFormat2GLFormatMap.insert(QVideoFrame::Format_YUV420P,  GL_VIV_I420);
//this video format needs to be commented because it will have support with kernel 3.10 but not with actual one
        static_VideoFormat2GLFormatMap.insert(QVideoFrame::Format_YV12,     GL_VIV_YV12);
        static_VideoFormat2GLFormatMap.insert(QVideoFrame::Format_NV12,     GL_VIV_NV12);
        static_VideoFormat2GLFormatMap.insert(QVideoFrame::Format_NV21,     GL_VIV_NV21);
        static_VideoFormat2GLFormatMap.insert(QVideoFrame::Format_UYVY,     GL_VIV_UYVY);
        static_VideoFormat2GLFormatMap.insert(QVideoFrame::Format_YUYV,     GL_VIV_YUY2);
        static_VideoFormat2GLFormatMap.insert(QVideoFrame::Format_RGB32,    GL_BGRA_EXT);
        static_VideoFormat2GLFormatMap.insert(QVideoFrame::Format_ARGB32,   GL_BGRA_EXT);
        static_VideoFormat2GLFormatMap.insert(QVideoFrame::Format_BGR32,    GL_RGBA);
        static_VideoFormat2GLFormatMap.insert(QVideoFrame::Format_BGRA32,   GL_RGBA);
        static_VideoFormat2GLFormatMap.insert(QVideoFrame::Format_RGB565,   GL_RGB565);
    }

return static_VideoFormat2GLFormatMap;
}

②
vi rootfs/usr/include/GLES2/gl2ext.h
/* GL_VIV_direct_texture */
#ifndef GL_VIV_direct_texture
#define GL_VIV_YV12                     0x8FC0
#define GL_VIV_NV12                     0x8FC1
#define GL_VIV_YUY2                     0x8FC2
#define GL_VIV_UYVY                     0x8FC3
#define GL_VIV_NV21                     0x8FC4
#define GL_VIV_I420                     0x8FC5 //新增
#endif
值来自于这个patch    https://lists.yoctoproject.org/pipermail/meta-freescale/2014-June/008709.html

11、编译错误：

ssl/qsslcontext_openssl.cpp:444:52: error: 'SSL_SESSION' has no member named 'tlsext_tick_lifetime_hint'
解决：

configure编译时添加-no-openssl，即不编译openssl

12、运行错误：

./examples/quick/demos/samegame/samegame 
qrc:///demos/samegame/samegame.qml:41:1: module "QtQuick" is not installed
qrc:///demos/samegame/samegame.qml:42:1: module "QtQuick.Particles" is not installed
qrc:///demos/samegame/samegame.qml:41:1: module "QtQuick" is not installed
qrc:///demos/samegame/samegame.qml:42:1: module "QtQuick.Particles" is not installed

解决：

在环境里添加：export QML2_IMPORT_PATH=$QT_ROOT/qml，就能解决qrc:///main.qml:1 module "QtQuick" is not installed这样类似的问题，

$QT_ROOT/qml是你编译安装后会有个文件夹的。

13、运行错误：./examples/quick/demos/samegame/samegame

This plugin does not support createPlatformOpenGLContext!
Failed to create OpenGL context for format QSurfaceFormat(version 2.0, options QFlags(), depthBufferSize 24, redBufferSize -1, greenBufferSize -1, blueBufferSize -1, alphaBufferSize -1, stencilBufferSize 8, samples -1, swapBehavior 2, swapInterval 1, profile  0) 
Aborted
回答：

The problem is likely that you are using qt quick 2, which requires OpenGL. OpenGL does not support the frame buffer used for the small display.

14、编译错误：

../WTF/wtf/unicode/wchar/UnicodeWchar.h: In function 'bool WTF::Unicode::isAlphanumeric(UChar)':

../WTF/wtf/unicode/wchar/UnicodeWchar.h:136:58: error: 'iswalnum' was not declared in this scope
../WTF/wtf/unicode/wchar/UnicodeWchar.h: In function 'bool WTF::Unicode::isDigit(UChar)':
../WTF/wtf/unicode/wchar/UnicodeWchar.h:137:51: error: 'iswdigit' was not declared in this scope
../WTF/wtf/unicode/wchar/UnicodeWchar.h: In function 'bool WTF::Unicode::isLetter(UChar)':

解决：
vi ./qtwebkit/Source/WTF/wtf/unicode/wchar/UnicodeWchar.h
#ifndef Android
/*add by gq start*/
#include <wctype.h>
typedef unsigned short int UChar;
/*add by gq end*/
//# include <wchar.h>
// typedef wchar_t UChar;
#else
 typedef unsigned short int UChar;
#endif

15、编译错误：cc1plus: error: unrecognized command line option '-fuse-ld=gold'
解决：

这是Qt的一个bug：https://bugs.webkit.org/show_bug.cgi?id=89312
在装有gold linker的系统里，编译脚本会加入-fuse-ld=gold选项，但这个选项gcc是不支持的。解决办法是移除该选项，
vi qtbase/configure
CFG_USE_GOLD_LINKER=no

16、编译错误3、arm-fsl-linux-gnueabi/bin/ld: error: arch.o uses VFP register arguments, arch does not

解决：

vi./qtbase/mkspecs/devices/linux-imx6-g++/qmake.conf
#DISTRO_OPTS += hard-float
屏蔽掉该句后
g++编译器就被设置成-mfloat-abi=softfp，不使用hard，即浮点运算使用软件不使用硬件。

17、运行错误：
root@freescale /opt$ ./examples/svg/embedded/fluidlauncher/fluidlauncher 
process 2622: D-Bus library appears to be incorrectly set up; failed to read machine uuid: Failed to open "/usr/var/lib/dbus/machine-id": No such file or directory
See the manual page for dbus-uuidgen to correct this issue.
  D-Bus not built with -rdynamic so unable to print a backtrace
Aborted

解决：
dbus-uuidgen > /usr/var/lib/dbus/machine-id

十、主要参考：

https://community.freescale.com/docs/DOC-94066

http://www.myir-tech.com/bbs/thread-7174-1-1.html