【TINY4412】QT5移植笔记：（2）QT5.7移植到Linux

【TINY4412】QT5移植笔记：（2）QT5.7移植到Linux

宿主机 ： 虚拟机 Ubuntu 16.04 LTS / X64
目标板[底板]： Tiny4412SDK - 1506
目标板[核心板]： Tiny4412 - 1412
LINUX内核： 4.12.0
交叉编译器： arm-none-linux-gnueabi-gcc（gcc version 4.8.3 20140320）
日期： 2017-9-16 09:59:02
作者： SY

简介

QT 是奇趣公司开发的基于 C++ 语言的 GUI 框架，具有良好的跨平台特性。在 Windows 开发调试好的程序，重新编译后在 Linux 上就可以运行。

我们将 QT 源码使用交叉编译器重新编译后，烧录到开发板中，就可以运行 QT 程序了！

移植

我们需要从 Qt Downloads 下载 5.7 版本的源码：qt-everywhere-opensource-src-5.7.0.tar.xz ，为什么选择 5.7 版本的软件呢？因为 5.7 版本以后，将不再支持 Windows XP ，为了保持兼容性才选择这个版本。

安装库

root@ubuntu:/opt/Qt5.7.0/qt-everywhere-opensource-src-5.7.0# apt-get install g++-multilib libx11-dev libxext-dev libxtst-dev zlib1g-dev lib32ncurses5 lib32z1 libpng-dev autoconf automake libtool lsb-core
root@ubuntu:/opt/Qt5.7.0/qt-everywhere-opensource-src-5.7.0# apt-get install build-essential libfontconfig1 libfontconfig1-dev libxrender-dev libxrender1 libxkbcommon-dev libxkbcommon-x11-0 libxkbcommon-x11-dev libxkbcommon0 libglib2.0-dev libglib2.0-0 libfreetype6 libfreetype6-dev
root@ubuntu:/opt/Qt5.7.0/qt-everywhere-opensource-src-5.7.0# apt-get install libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev libgconf2-dev libdbus-1-dev libedbus-dev

虚拟机

解压文件

root@ubuntu:/opt/fs/qt/qt5.7.0# ls
qt-everywhere-opensource-src-5.7.0.tar.xz
root@ubuntu:/opt/fs/qt/qt5.7.0# tar xf qt-everywhere-opensource-src-5.7.0.tar.xz
root@ubuntu:/opt/fs/qt/qt5.7.0# ls
qt-everywhere-opensource-src-5.7.0
root@ubuntu:/opt/fs/qt/qt5.7.0# cd qt-everywhere-opensource-src-5.7.0/
root@ubuntu:/opt/fs/qt/qt5.7.0/qt-everywhere-opensource-src-5.7.0# ls
coin                LICENSE.LGPLv3              qtconnectivity      qtmultimedia      qtserialport       qtwebview
configure           LICENSE.PREVIEW.COMMERCIAL  qtdatavis3d         qt.pro            qtsvg              qtwinextras
configure.bat       Makefile                    qtdeclarative       qtpurchasing      qttools            qtx11extras
gnuwin32            qt3d                        qtdoc               qtquickcontrols   qttranslations     qtxmlpatterns
LGPL_EXCEPTION.txt  qtactiveqt                  qtgamepad           qtquickcontrols2  qtvirtualkeyboard  README
LICENSE.FDL         qtandroidextras             qtgraphicaleffects  qtscript          qtwayland
LICENSE.GPLv2       qtbase                      qtimageformats      qtscxml           qtwebchannel
LICENSE.GPLv3       qtcanvas3d                  qtlocation          qtsensors         qtwebengine
LICENSE.LGPLv21     qtcharts                    qtmacextras         qtserialbus       qtwebsockets
root@ubuntu:/opt/Qt5.7.0/qt-everywhere-opensource-src-5.7.0# mkdir /usr/local/Qt5.7.0

修改配置文件

root@ubuntu:/opt/fs/qt/qt5.7.0/qt-everywhere-opensource-src-5.7.0# vim qtbase/mkspecs/linux-arm-gnueabi-g++/qmake.conf

修改为以下内容

#
# 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  += -msoft-float -D__GCC_FLOAT_NOT_NEEDED -march=armv7-a -mtune=cortex-a9
QMAKE_CXXFLAGS += -msoft-float -D__GCC_FLOAT_NOT_NEEDED -march=armv7-a -mtune=cortex-a9

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

# modifications to g++.conf
QMAKE_CC                = arm-none-linux-gnueabi-gcc -lts
QMAKE_CXX               = arm-none-linux-gnueabi-g++ -lts
QMAKE_LINK              = arm-none-linux-gnueabi-g++ -lts
QMAKE_LINK_SHLIB        = arm-none-linux-gnueabi-g++ -lts

# modifications to linux.conf
QMAKE_AR                = arm-none-linux-gnueabi-ar cqs
QMAKE_OBJCOPY           = arm-none-linux-gnueabi-objcopy
QMAKE_NM                = arm-none-linux-gnueabi-nm -P
QMAKE_STRIP             = arm-none-linux-gnueabi-strip
load(qt_config)

建立安装目录

root@ubuntu:/opt/fs/qt/qt5.7.0/qt-everywhere-opensource-src-5.7.0/qtbase/mkspecs/linux-arm-gnueabi-g++# mkdir -p /usr/local/Qt5.7.0

建立一个 configurate 脚本

#!/bin/bash

#################################################
# Developer: SY
# Data     : 2017-9-16 10:26:13
# Function : Auto Configure Project
#################################################

./configure  -prefix /usr/local/Qt5.7.0 \
  -opensource \
  -release \
  -confirm-license \
  -xplatform linux-arm-gnueabi-g++ \
  -shared \
  -qt-zlib \
  -no-gif \
  -qt-libjpeg \
  -no-nis \
  -no-opengl \
  -no-cups \
  -no-glib \
  -no-dbus \
  -no-rpath \
  -no-sse2 -no-sse3 -no-ssse3 -no-sse4.1 -no-sse4.2 \
  -no-avx  \
  -no-openssl \
  -nomake tools \
  -qreal float \
  -qt-libpng \
  -tslib \
  -skip qtdeclarative \
  -nomake examples \
  -I /usr/local/tslib/include \
  -L /usr/local/tslib/lib \

echo "done!"

• 支持多点触摸：-mtdev -xinput2 ，但是添加会出错。

执行脚本

root@ubuntu:/opt/fs/qt/qt5.7.0/qt-everywhere-opensource-src-5.7.0# ./auto_configurate.sh 
  ...
Build options:
  Configuration .......... accessibility audio-backend c++11 clock-gettime clock-monotonic compile_examples concurrent cross_compile doubleconversion evdev eventfd freetype full-config getaddrinfo getifaddrs harfbuzz iconv inotify ipv6ifname large-config largefile linuxfb medium-config minimal-config mremap no-gif no-pkg-config pcre png poll_ppoll posix_fallocate qpa qpa reduce_exports release shared small-config threadsafe-cloexec tslib zlib 
  Build parts ............ libs
  Mode ................... release
  Using sanitizer(s)...... none
  Using C++ standard ..... c++11
  Using gold linker....... no
  Using new DTAGS ........ no
  Using PCH .............. no
  Using LTCG ............. no
  Target compiler supports:
    Neon ................. no

Qt modules and options:
  Qt D-Bus ............... no
  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 ................... no
  CUPS ................... no
  DoubleConversion........ yes (bundled copy)
  Evdev .................. yes
  FontConfig ............. no
  FreeType ............... yes (bundled copy)
  Glib ................... no
  GStreamer .............. no
  GTK platformtheme ...... no
  HarfBuzz ............... yes (bundled copy)
  Iconv .................. yes
  ICU .................... no
  Image formats: 
    GIF .................. no
    JPEG ................. yes (plugin, using bundled copy)
    PNG .................. yes (in QtGui, using bundled copy)
  libinput................ no
  Logging backends: 
    journald ............... no
    syslog   ............... no
  mtdev .................. no
  Networking: 
    getaddrinfo .......... yes
    getifaddrs ........... yes
    IPv6 ifname .......... yes
    libproxy.............. no
    OpenSSL .............. no
  NIS .................... no
  OpenGL / OpenVG: 
    EGL .................. no
    OpenGL ............... no
    OpenVG ............... no
  PCRE ................... yes (bundled copy)
  pkg-config ............. no 
  PulseAudio ............. no
  QPA backends: 
    DirectFB ............. no
    EGLFS ................ no
      EGLFS i.MX6 ........ no
      EGLFS i.MX6 Wayland. no
      EGLFS EGLDevice .... no
      EGLFS GBM .......... no
      EGLFS Mali ......... no
      EGLFS Raspberry Pi . no
      EGLFS X11 .......... no
    LinuxFB .............. yes
    Mir client............ no
    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)

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into /usr/local/Qt5.7.0

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

done!

注意，在脚本中有一个很重要配置：-skip qtdeclarative \ ，如果不加上这一句，在编译时出现错误：

Project MESSAGE: Hunspell not found! Spell correction will not be available.
Project ERROR: Unknown module(s) in QT: quick
Makefile:44: recipe for target 'sub-virtualkeyboard-make_first' failed
make[2]: *** [sub-virtualkeyboard-make_first] Error 3

参考网上帖子：How to install and build Qt5.7-everywhere for beaglebone black- OS debian?

安装各种库，参考：qtbase/src/plugins/platforms/xcb/README

root@ubuntu:/opt/fs/qt/qt5.7.0/qt-everywhere-opensource-src-5.7.0/ apt-get install libncurses5-dev libreadline-dev libxcb1 libxcb1-dev libx11-xcb1 libx11-xcb-dev libxcb-keysyms1 libxcb-keysyms1-dev libxcb-image0 libxcb-image0-dev libxcb-shm0 libxcb-shm0-dev libxcb-icccm4 libxcb-icccm4-dev libxcb-sync-dev libxcb-xfixes0-dev libxrender-dev libxcb-shape0-dev libxcb-randr0-dev libxcb-render-util0 libxcb-render-util0-dev libxcb-glx0-dev libxcb-xinerama0-dev

然后执行：make -j4

然后执行：make install ，安装文件被安装到路径：/usr/local/Qt5.7.0

root@ubuntu:/home/sy# cd /usr/local/Qt5.7.0/
root@ubuntu:/usr/local/Qt5.7.0# ls
bin  doc  include  lib  mkspecs  plugins  translations
root@ubuntu:/usr/local/Qt5.7.0# cd bin/
root@ubuntu:/usr/local/Qt5.7.0/bin# ls
canbusutil        lconvert  lupdate  qdoc   qmake   qtpaths       rcc        uic          xmlpatternsvalidator
fixqt4headers.pl  lrelease  moc      qlalr  qtdiag  qtplugininfo  syncqt.pl  xmlpatterns

其中：qmake 就是用于自动生成 Makefile 的工具，以后编译 qt 工程的时候会经常遇到。

编译应用程序

生成 Makefile

root@ubuntu:/opt/fs/rootfs/rootfs/tmp/GDB# /usr/local/Qt5.7.0/bin/qmake GDB.pro
Info: creating stash file /opt/fs/rootfs/rootfs/tmp/GDB/.qmake.stash
root@ubuntu:/opt/fs/rootfs/rootfs/tmp/GDB# ls
app.ico    crc16.h       GDB.pro.user.4b6dd04  mainwindow.h   RES           UAC.rc     xml.cpp
config     GDB.pro       main.cpp              mainwindow.ui  res.qrc       utils.cpp  xml.h
crc16.cpp  GDB.pro.user  mainwindow.cpp        Makefile       UAC.manifest  utils.h

然后 make

root@ubuntu:/opt/fs/rootfs/rootfs/tmp/GDB# make
root@ubuntu:/opt/fs/rootfs/rootfs/tmp/GDB# ls
app.ico    GDB                   main.o          Makefile            moc_xml.cpp  res.qrc          utils.h
config     GDB.pro               mainwindow.cpp  moc_crc16.cpp       moc_xml.o    UAC.manifest     utils.o
crc16.cpp  GDB.pro.user          mainwindow.h    moc_crc16.o         qrc_res.cpp  UAC.rc           xml.cpp
crc16.h    GDB.pro.user.4b6dd04  mainwindow.o    moc_mainwindow.cpp  qrc_res.o    ui_mainwindow.h  xml.h
crc16.o    main.cpp              mainwindow.ui   moc_mainwindow.o    RES          utils.cpp        xml.o

生成 GDB 可执行程序，将文件拷贝到开发板就可以运行。

用上述方法可以运行 QT 官方的例程：

root@ubuntu:/# cd /opt/fs/qt/qt5.7.0/qt-everywhere-opensource-src-5.7.0/qtbase/examples/
root@ubuntu:/opt/fs/qt/qt5.7.0/qt-everywhere-opensource-src-5.7.0/qtbase/examples# ls
aggregate  dbus      examples.pro  Makefile  opengl  qpa           qtestlib  sql    widgets
corelib    embedded  gui           network   qmake   qtconcurrent  README    touch  xml
root@ubuntu:/opt/fs/qt/qt5.7.0/qt-everywhere-opensource-src-5.7.0/qtbase/examples# /usr/local/Qt5.7.0/bin/qmake 
root@ubuntu:/opt/fs/qt/qt5.7.0/qt-everywhere-opensource-src-5.7.0/qtbase/examples# make
root@ubuntu:/opt/fs/qt/qt5.7.0/qt-everywhere-opensource-src-5.7.0/qtbase/examples# make clean

这样所有的例程全部编译完毕，烧录到 linux 中执行。

看到演示效果才发现以 linuxfb 运行的程序，全部都没有边框。没有右上角的 X - 口 标识。

开发板

将该目录下的所有文件拷贝到开发板的根文件系统：

root@ubuntu:/usr/local/Qt5.7.0# cp -a * /opt/fs/rootfs/rootfs/usr/local/Qt5.7.0/

修改配置文件

root@ubuntu:/opt/fs/rootfs/rootfs# cat etc/profile
# /etc/profile: system-wide .profile file for the Bourne shells

echo ""
echo -n "Processing /etc/profile... "

# No core files by default
ulimit -S -c 0 > /dev/null 2>&1

USER="`id -un`"
LOGNAME=$USER
HOSTNAME='/bin/hostname'

PS1='[\u@\h:\w]# '
PATH=$PATH

export USER LOGNAME PS1 PATH

# tslib
export T_ROOT=/usr/local/tslib
export LD_LIBRARY_PATH=/usr/local/tslib/lib:$LD_LIBRARY_PATH
export TSLIB_CONSOLEDEVICE=none
export TSLIB_FBDEVICE=/dev/fb0
export TSLIB_TSDEVICE=/dev/input/event0
export TSLIB_PLUGINDIR=$T_ROOT/lib/ts
export TSLIB_CONFFILE=$T_ROOT/etc/ts.conf
export POINTERCAL_FILE=/etc/pointercal
export TSLIB_CALIBFILE=/etc/pointercal

# Qt
export QTEDIR=/usr/local/Qt5.7.0
export LD_LIBRARY_PATH=/usr/local/Qt5.7.0/lib:$LD_LIBRARY_PATH
export QT_QPA_GENERIC_PLUGINS=tslib
export QT_QPA_FONTDIR=$QTEDIR/lib/fonts
export QT_QPA_PLATFORM_PLUGIN_PATH=$QTEDIR/plugins
export QT_QPA_PLATFORM=linuxfb:fb=/dev/fb0:size=800x480:mmSize=800x480:offset=0x0:tty=/dev/tty1
export QT_QPA_FB_TSLIB=1
export QT_QPA_FB_HIDECURSOR=/dev/input/mouse1
export LD_PRELOAD=$QTEDIR/lib/preloadable_libiconv.so

echo "Done!"

添加字体

从友善之臂的光盘中拷贝字体：DroidSansFallback.ttf 放到开发板路径：/usr/local/Qt5.7.0/lib/fonts

添加字体路径：

[root@TINY4412:~]# vi etc/profile
export QTEDIR=/usr/local/Qt5.7.0
export QT_QPA_FONTDIR=$QTEDIR/lib/fonts

添加键盘

参考Qt for Embedded Linux Environment Variables

将键盘插入开发板

[root@TINY4412:~]# [  356.181581] usb 2-2.3: new low-speed USB device number 5 using exynos-ehci
[  356.338068] usb 2-2.3: New USB device found, idVendor=1c4f, idProduct=0002
[  356.338218] usb 2-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  356.338358] usb 2-2.3: Product: USB Keyboard
[  356.338454] usb 2-2.3: Manufacturer: SIGMACHIP
[  356.349473] input: SIGMACHIP USB Keyboard as /devices/platform/12580000.ehci/usb2/2-2/2-2.3/2-2.3:1.0/0003:1C4F:0002.0001/input/input4
[  356.415871] hid-generic 0003:1C4F:0002.0001: input: USB HID v1.10 Keyboard [SIGMACHIP USB Keyboard] on usb-12580000.ehci-2.3/input0
[  356.454307] input: SIGMACHIP USB Keyboard as /devices/platform/12580000.ehci/usb2/2-2/2-2.3/2-2.3:1.1/0003:1C4F:0002.0002/input/input5
[  356.522293] hid-generic 0003:1C4F:0002.0002: input: USB HID v1.10 Device [SIGMACHIP USB Keyboard] on usb-12580000.ehci-2.3/input1

查看 proc

[root@TINY4412:~]# cat /proc/bus/input/devices 
I: Bus=0003 Vendor=1c4f Product=0002 Version=0110
N: Name="SIGMACHIP USB Keyboard"
P: Phys=usb-12580000.ehci-2.3/input0
S: Sysfs=/devices/platform/12580000.ehci/usb2/2-2/2-2.3/2-2.3:1.0/0003:1C4F:0002.0001/input/input4
U: Uniq=
H: Handlers=sysrq kbd leds event4 
B: PROP=0
B: EV=120013
B: KEY=10000 7 ff800000 7ff febeffdf f3cfffff ffffffff fffffffe
B: MSC=10
B: LED=7

I: Bus=0003 Vendor=1c4f Product=0002 Version=0110
N: Name="SIGMACHIP USB Keyboard"
P: Phys=usb-12580000.ehci-2.3/input1
S: Sysfs=/devices/platform/12580000.ehci/usb2/2-2/2-2.3/2-2.3:1.1/0003:1C4F:0002.0002/input/input5
U: Uniq=
H: Handlers=kbd event5 
B: PROP=0
B: EV=1f
B: KEY=3007f 0 0 0 0 483ffff 17aff32d bf544446 0 0 1 130c13 b17c000 267bfa d941dfed 9e1680 4400 0 10000002
B: REL=40
B: ABS=1 0
B: MSC=10

鼠标含有 2 个接口，因此识别为 dev/input/event4 dev/input/event5

按照 qt 的说明文档，需要添加 QWS_KEYBOARD 环境变量

export QWS_KEYBOARD=/dev/input/event4

但是实测插上键盘后直接可以输入数据，不添加环境变量也可以。

添加鼠标

将鼠标插入开发板

[root@TINY4412:~]# [ 1016.121660] usb 2-2.3: new low-speed USB device number 13 using exynos-ehci
[ 1016.276005] usb 2-2.3: New USB device found, idVendor=275d, idProduct=0ba6
[ 1016.276198] usb 2-2.3: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[ 1016.276364] usb 2-2.3: Product: USB OPTICAL MOUSE 
[ 1016.288896] input: USB OPTICAL MOUSE  as /devices/platform/12580000.ehci/usb2/2-2/2-2.3/2-2.3:1.0/0003:275D:0BA6.000F/input/input18
[ 1016.292002] hid-generic 0003:275D:0BA6.000F: input: USB HID v1.11 Mouse [USB OPTICAL MOUSE ] on usb-12580000.ehci-2.3/input0

查看 proc

[root@TINY4412:~]# cat /proc/bus/input/devices 
I: Bus=0003 Vendor=275d Product=0ba6 Version=0111
N: Name="USB OPTICAL MOUSE "
P: Phys=usb-12580000.ehci-2.3/input0
S: Sysfs=/devices/platform/12580000.ehci/usb2/2-2/2-2.3/2-2.3:1.0/0003:275D:0BA6.000F/input/input18
U: Uniq=
H: Handlers=mouse1 event6 
B: PROP=0
B: EV=17
B: KEY=70000 0 0 0 0 0 0 0 0
B: REL=103
B: MSC=10

鼠标被识别为 dev/input/mouse1

[root@TINY4412:~]# vi /etc/profile
export QT_QPA_FB_HIDECURSOR=/dev/input/mouse1

添加触摸屏

[root@TINY4412:~]# vi etc/profile 
export QT_QPA_FB_TSLIB=1

添加虚拟键盘

下载 qtvirtualkeyboard-opensource-src-5.7.0.tar.xz 源码，

root@ubuntu:/opt/fs/qt/qt5.7.0# ls
qt-everywhere-opensource-src-5.7.0  qtvirtualkeyboard-opensource-src-5.7.0.tar.xz
root@ubuntu:/opt/fs/qt/qt5.7.0# tar xf qtvirtualkeyboard-opensource-src-5.7.0.tar.xz 
root@ubuntu:/opt/fs/qt/qt5.7.0# ls
qt-everywhere-opensource-src-5.7.0      qtvirtualkeyboard-opensource-src-5.7.0.tar.xz
qtvirtualkeyboard-opensource-src-5.7.0
root@ubuntu:/opt/fs/qt/qt5.7.0# rm -rf qtvirtualkeyboard-opensource-src-5.7.0.tar.xz 
root@ubuntu:/opt/fs/qt/qt5.7.0# ls
qt-everywhere-opensource-src-5.7.0  qtvirtualkeyboard-opensource-src-5.7.0
root@ubuntu:/opt/fs/qt/qt5.7.0# cd qtvirtualkeyboard-opensource-src-5.7.0/
root@ubuntu:/opt/fs/qt/qt5.7.0/qtvirtualkeyboard-opensource-src-5.7.0# ls
dist  examples  LICENSE.GPL3  Makefile  mkspecs  qtvirtualkeyboard.pro  README.md  src  sync.profile  tests

配置支持拼音输入法

root@ubuntu:/opt/fs/qt/qt5.7.0/qtvirtualkeyboard-opensource-src-5.7.0# /usr/local/Qt5.7.0/bin/qmake CONFIG+="lang-en_GB lang-zh_CN"

编译

root@ubuntu:/opt/fs/qt/qt5.7.0/qtvirtualkeyboard-opensource-src-5.7.0# make
cd src/ && ( test -e Makefile || /usr/local/Qt5.7.0/bin/qmake /opt/fs/qt/qt5.7.0/qtvirtualkeyboard-opensource-src-5.7.0/src/src.pro -o Makefile ) && make -f Makefile 
make[1]: Entering directory '/opt/fs/qt/qt5.7.0/qtvirtualkeyboard-opensource-src-5.7.0/src'
cd virtualkeyboard/ && ( test -e Makefile || /usr/local/Qt5.7.0/bin/qmake /opt/fs/qt/qt5.7.0/qtvirtualkeyboard-opensource-src-5.7.0/src/virtualkeyboard/virtualkeyboard.pro '+=lang-en_GB lang-zh_CN' -o Makefile ) && make -f Makefile 
(command line): Assignment needs exactly one word on the left hand side.
Project MESSAGE: Hunspell not found! Spell correction will not be available.
Project ERROR: Unknown module(s) in QT: qml quick
Makefile:44: recipe for target 'sub-virtualkeyboard-make_first' failed
make[1]: *** [sub-virtualkeyboard-make_first] Error 3
make[1]: Leaving directory '/opt/fs/qt/qt5.7.0/qtvirtualkeyboard-opensource-src-5.7.0/src'
Makefile:44: recipe for target 'sub-src-make_first' failed
make: *** [sub-src-make_first] Error 2

这个问题在编译 qt 时就出现，一直没找到解决方案，留着以后解决。

测试

运行官方例程：

[root@TINY4412:/opt/examples]# ./touch/pinchzoom/pinchzoom
QIconvCodec::convertToUnicode: using Latin-1 for conversion, iconv_open failed
QIconvCodec::convertFromUnicode: using Latin-1 for conversion, iconv_open failed

参考：qt5.2.0 交叉编译 跑到arm板上，中/英字符都显示不出来 ，下载：libiconv-1.14.tar.gz

出现错误：iconv_open failed

c
root@ubuntu:/opt/fs/qt/qt5.7.0# ls
libiconv-1.14.tar.gz qt-everywhere-opensource-src-5.7.0 qtvirtualkeyboard-opensource-src-5.7.0
root@ubuntu:/opt/fs/qt/qt5.7.0# tar zxf libiconv-1.14.tar.gz
root@ubuntu:/opt/fs/qt/qt5.7.0# ls
libiconv-1.14 libiconv-1.14.tar.gz qt-everywhere-opensource-src-5.7.0 qtvirtualkeyboard-opensource-src-5.7.0
root@ubuntu:/opt/fs/qt/qt5.7.0# rm -rf libiconv-1.14.tar.gz
root@ubuntu:/opt/fs/qt/qt5.7.0# ls
libiconv-1.14 qt-everywhere-opensource-src-5.7.0 qtvirtualkeyboard-opensource-src-5.7.0
root@ubuntu:/opt/fs/qt/qt5.7.0# cd libiconv-1.14/
root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14# ls
ABOUT-NLS ChangeLog COPYING.LIB extras lib man PORTS src tools
aclocal.m4 config.h.in DEPENDENCIES gnulib-local libcharset NEWS preload srclib windows
AUTHORS configure DESIGN HACKING m4 NOTES README srcm4 woe32dll
autogen.sh configure.ac djgpp include Makefile.devel os2 README.djgpp tests
build-aux COPYING doc INSTALL.generic Makefile.in po README.woe32 THANKS
root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14# ./configure -prefix=$PWD/_install -host=arm-none-linux-gnueabi
...
root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14# make


出现错误：

In file included from progname.c:26:0:
./stdio.h:1010:1: error: 'gets' undeclared here (not in a function)
 _GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
 ^
Makefile:914: recipe for target 'progname.o' failed
make[2]: *** [progname.o] Error 1
make[2]: Leaving directory '/opt/fs/qt/qt5.7.0/libiconv-1.14/srclib'
Makefile:865: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/opt/fs/qt/qt5.7.0/libiconv-1.14/srclib'
Makefile:33: recipe for target 'all' failed
make: *** [all] Error 2

解决编译libiconv时报错：./stdio.h:1010:1: error: ‘gets’ undeclared here (not in a function)

做如下修改：

root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14# vim srclib/stdio.in.h
 694 _GL_CXXALIASWARN (gets);
 695 /* It is very rare that the developer ever has full control of stdin,
 696    so any use of gets warrants an unconditional warning.  Assume it is
 697    always declared, since it is required by C89.  */
 698 /* _GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead"); */
 699 #if defined(__GLIBC__) && !defined(__UCLIBC__) && !__GLIBC_PREREQ(2, 16)
 700     _GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
 701 #endif

编译成功！

root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14# make install
root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14# cd _install/
root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14/_install# ls
bin  include  lib  share

拷贝库到开发板

root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14/_install# cp lib/preloadable_libiconv.so /opt/fs/rootfs/rootfs/usr/local/Qt5.7.0/lib/

添加到环境变量

[root@TINY4412:~]# vi /etc/profile 
export QTEDIR=/usr/local/Qt5.7.0
export LD_PRELOAD=$QTEDIR/lib/preloadable_libiconv.so
[root@TINY4412:~]# source /etc/profile

再次运行程序，错误消失！

参考

移植QT5.6到嵌入式开发板（史上最详细的QT移植教程）

Qt-5.3.2 在友善Smart210开发板的移植记录

Qt：5.7虚拟键盘中拼音输入法的使用