【TINY4412】QT5移植筆記：（2）QT5.7移植到Linux
宿主機 ： 虛擬機 Ubuntu 16.04 LTS / X64
目標板[底板]： Tiny4412SDK - 1506
目標板[核心板]： Tiny4412 - 1412
LINUX內核： 4.12.0
交叉編譯器： arm-none-linux-gnueabi-gcc（gcc version 4.8.3 20140320）
日期： 2017-9-16 09:59:02
作者： SY
簡介
QT 是奇趣公司開發的基於 C++ 語言的 GUI 框架，具有良好的跨平臺特性。在 Windows 開發調試好的程序，重新編譯後在 Linux 上就可以運行。
我們將 QT 源碼使用交叉編譯器重新編譯後，燒錄到開發板中，就可以運行 QT 程序了！
移植
我們需要從 Qt Downloads 下載 5.7 版本的源碼：qt-everywhere-opensource-src-5.7.0.tar.xz ，爲什麼選擇 5.7 版本的軟件呢？因爲 5.7 版本以後，將不再支持 Windows XP ，爲了保持兼容性才選擇這個版本。
安裝庫
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虛擬機
解壓文件
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修改爲以下內容
#
# 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)建立安裝目錄
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建立一個 configurate 腳本
#!/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!"- 支持多點觸摸：
-mtdev-xinput2，但是添加會出錯。
執行腳本
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，在腳本中有一個很重要配置：-skip qtdeclarative \ ，如果不加上這一句，在編譯時出現錯誤：
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 3參考網上帖子：How to install and build Qt5.7-everywhere for beaglebone black- OS debian?
安裝各種庫，參考：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然後執行：make -j4
然後執行：make install ，安裝文件被安裝到路徑：/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 就是用於自動生成 Makefile 的工具，以後編譯 qt 工程的時候會經常遇到。
編譯應用程序
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然後 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 可執行程序，將文件拷貝到開發板就可以運行。
用上述方法可以運行 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這樣所有的例程全部編譯完畢，燒錄到 linux 中執行。
看到演示效果才發現以 linuxfb 運行的程序，全部都沒有邊框。沒有右上角的 X - 口 標識。
開發板
將該目錄下的所有文件拷貝到開發板的根文件系統：
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=$QTEDIR/lib/preloadable_libiconv.so
echo "Done!"添加字體
從友善之臂的光盤中拷貝字體：DroidSansFallback.ttf 放到開發板路徑：/usr/local/Qt5.7.0/lib/fonts
添加字體路徑：
[root@TINY4412:~]# vi etc/profile
export QTEDIR=/usr/local/Qt5.7.0
export QT_QPA_FONTDIR=$QTEDIR/lib/fonts添加鍵盤
參考Qt for Embedded Linux Environment Variables
將鍵盤插入開發板
[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鼠標含有 2 個接口，因此識別爲 dev/input/event4 dev/input/event5
按照 qt 的說明文檔，需要添加 QWS_KEYBOARD 環境變量
export QWS_KEYBOARD=/dev/input/event4但是實測插上鍵盤後直接可以輸入數據，不添加環境變量也可以。
添加鼠標
將鼠標插入開發板
[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鼠標被識別爲 dev/input/mouse1
[root@TINY4412:~]# vi /etc/profile
export QT_QPA_FB_HIDECURSOR=/dev/input/mouse1添加觸摸屏
[root@TINY4412:~]# vi etc/profile
export QT_QPA_FB_TSLIB=1添加虛擬鍵盤
下載 qtvirtualkeyboard-opensource-src-5.7.0.tar.xz 源碼，
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配置支持拼音輸入法
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"編譯
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這個問題在編譯 qt 時就出現，一直沒找到解決方案，留着以後解決。
測試
運行官方例程：
[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
參考：qt5.2.0 交叉編譯 跑到arm板上，中/英字符都顯示不出來 ，下載：libiconv-1.14.tar.gz
出現錯誤：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=$PWD/_install -host=arm-none-linux-gnueabi
...
root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14# make
出現錯誤：
In file included from progname.c:26:0:
./stdio.h:1010:1: error: 'gets' undeclared here (not in a function)
_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
^
Makefile:914: recipe for target 'progname.o' failed
make[2]: *** [progname.o] Error 1
make[2]: Leaving directory '/opt/fs/qt/qt5.7.0/libiconv-1.14/srclib'
Makefile:865: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/opt/fs/qt/qt5.7.0/libiconv-1.14/srclib'
Makefile:33: recipe for target 'all' failed
make: *** [all] Error 2解決編譯libiconv時報錯：./stdio.h:1010:1: error: ‘gets’ undeclared here (not in a function)
做如下修改：
root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14# vim srclib/stdio.in.h
694 _GL_CXXALIASWARN (gets);
695 /* It is very rare that the developer ever has full control of stdin,
696 so any use of gets warrants an unconditional warning. Assume it is
697 always declared, since it is required by C89. */
698 /* _GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead"); */
699 #if defined(__GLIBC__) && !defined(__UCLIBC__) && !__GLIBC_PREREQ(2, 16)
700 _GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
701 #endif編譯成功！
root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14# make install
root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14# cd _install/
root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14/_install# ls
bin include lib share拷貝庫到開發板
root@ubuntu:/opt/fs/qt/qt5.7.0/libiconv-1.14/_install# cp lib/preloadable_libiconv.so /opt/fs/rootfs/rootfs/usr/local/Qt5.7.0/lib/添加到環境變量
[root@TINY4412:~]# vi /etc/profile
export QTEDIR=/usr/local/Qt5.7.0
export LD_PRELOAD=$QTEDIR/lib/preloadable_libiconv.so
[root@TINY4412:~]# source /etc/profile再次運行程序，錯誤消失！