cross compile Qt5 source on DM8168/AM389x

[ambershark]

This is your problem cc1plus: error: unrecognized command line option "-std=gnu++11". The -std=gnu++11 is not valid in your compiler. Which makes sense. Most ARM compilers are not very up to date. If you need c++11 support try changing gnu++11 to c++11 and that should fix your issue.

This assumes that your compiler supports c++11, which it may not at all, in which case you have to remove c++11 support.

Edit: Oops I should read more.. this is compiling Qt source not your own project. You will need to disable c++11 support in Qt if your ARM compiler doesn't support it. I'm not sure if that's even possible now-a-days, but a quick ./configure --help should give you the answer.

[jsulm]

@ambershark @Alex_wang Qt itself requires C++11 since (I think) 5.6, so without C++11 5.9.1 will for sure not build.

[Alex_wang]

@jsulm @ambershark
Can you tell me where to configure the "-std=gnu++11" ,change it to "-std=c++11"?

I can't find the configure file.

[jsulm]

@Alex_wang Does "configure --help" show anything?

[ambershark]

@Alex_wang Here's from ./configure --help:

-c++std <edition> .... Select C++ standard <edition> [c++1z/c++14/c++11]

[Alex_wang]

@ambershark @jsulm
Hi,
c++std error has been solved ,but another error is occurring:

 /home/wangbi/workdir_project/workdir_Qt/ToolChain/arago/bin/arm-arago-linux-gnueabi-g++ -c -pipe -mfloat-abi=softfp --sysroot=/home/wangbi/workdir_project/workdir_Qt/rfs -g -Wall -W -fPIC  -I. -I/home/wangbi/workdir_project/workdir_Qt/rfs/include -I/home/wangbi/workdir_project/workdir_Qt/rfs/usr/include -I/home/wangbi/workdir_project/workdir_Qt/Qt5.8/qt-everywhere-opensource-src-5.8.0/qtbase/mkspecs/devices/linux-arm-gnueabi-ti-g++ -o arch.o arch.cpp
> In file included from ../../src/corelib/global/archdetect.cpp:41:0,
>                  from arch.cpp:42:
> ../../src/corelib/global/qprocessordetection.h:145:6: error: #error "ARM architecture too old"
> Makefile:221: recipe for target 'arch.o' failed
> make: *** [arch.o] Error 1
Project ERROR: Could not determine target architecture. See config.log for details.

[jsulm]

@Alex_wang What is your target architecture and its CPU?

[Alex_wang]

@jsulm

1 ARM Cortex-A8

[Alex_wang]

@jsulm
8168 arch is ArmV7-a 32bits,

[Alex_wang]

@ambershark
configure:

#!/bin/sh
./configure \
-v \
-opensource \
-confirm-license \
-device-option CROSS_COMPILE=/home/wangbi/workdir_project/workdir_Qt/ToolChain/arago-2011.09/armv7a/bin/arm-arago-linux-gnueabi- \
-device linux-arm-gnueabi-ti-g++  \
-prefix /usr/local/qt5 \
-extprefix /home/wangbi/workdir_project/workdir_Qt/Qt5.9.1/qt5  \
-hostprefix /home/wangbi/workdir_project/workdir_Qt/Qt5.9.1/qt5-host  \
-nomake examples \
-nomake tests    \
-opengl es2       \
-c++std c++11   \
-sysroot /home/wangbi/workdir_project/workdir_Qt/rfs

but the error still :

> cc1plus: error: unrecognized command line option "-std=gnu++11"
> Makefile:188: recipe for target 'opengles2.o' failed
> make: *** [opengles2.o] Error 1
 => source failed verification.
test config.gui.libraries.opengl_es2 FAILED

the c++11 check:

Checking for compiler defaulting to C++11 or higher... 
+ cd /home/wangbi/workdir_project/workdir_Qt/Qt5.8/qt-everywhere-opensource-src-5.8.0/qtbase/config.tests/common/c++98default && /home/wangbi/workdir_project/workdir_Qt/Qt5.8/qt-everywhere-opensource-src-5.8.0/qtbase/bin/qmake -qtconf /home/wangbi/workdir_project/workdir_Qt/Qt5.8/qt-everywhere-opensource-src-5.8.0/qtbase/bin/qt.conf "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared console" "QMAKE_CFLAGS += --sysroot=/home/wangbi/workdir_project/workdir_Qt/rfs" "QMAKE_CXXFLAGS += --sysroot=/home/wangbi/workdir_project/workdir_Qt/rfs" "QMAKE_LFLAGS += --sysroot=/home/wangbi/workdir_project/workdir_Qt/rfs" /home/wangbi/workdir_project/workdir_Qt/Qt5.8/qt-everywhere-opensource-src-5.8.0/qtbase/config.tests/common/c++98default
+ cd /home/wangbi/workdir_project/workdir_Qt/Qt5.8/qt-everywhere-opensource-src-5.8.0/qtbase/config.tests/common/c++98default && MAKEFLAGS= /usr/bin/make
> /home/wangbi/workdir_project/workdir_Qt/ToolChain/arago-2011.09/armv7a/bin/arm-arago-linux-gnueabi-g++ -c -pipe -march=armv7-a -mfloat-abi=softfp --sysroot=/home/wangbi/workdir_project/workdir_Qt/rfs -O2 -Wall -W -fPIC  -I. -I/home/wangbi/workdir_project/workdir_Qt/rfs/include -I/home/wangbi/workdir_project/workdir_Qt/rfs/usr/include -I/home/wangbi/workdir_project/workdir_Qt/rfs/usr/include/EGL -I/home/wangbi/workdir_project/workdir_Qt/rfs/usr/include/EWS -I/home/wangbi/workdir_project/workdir_Qt/rfs/usr/include/GLES -I/home/wangbi/workdir_project/workdir_Qt/rfs/usr/include/GLES2 -I/home/wangbi/workdir_project/workdir_Qt/rfs/usr/include/KHR -I/home/wangbi/workdir_project/workdir_Qt/Qt5.8/qt-everywhere-opensource-src-5.8.0/qtbase/mkspecs/devices/linux-arm-gnueabi-ti-g++ -o c++98default.o c++98default.cpp
> c++98default.cpp:41:2: error: #error "compiler does not use c++11 or higher by default"
> Makefile:176: recipe for target 'c++98default.o' failed
> make: *** [c++98default.o] Error 1
test config.qtbase.tests.cxx11default FAILED

[ambershark]

@Alex_wang Looks like your compiler doesn't support c++11 or higher. You will need a more modern compiler to use Qt newer than 5.6.

[aha_1980]

@jsulm said in cross compile Qt5 source on DM8168/AM389x:

@ambershark @Alex_wang Qt itself requires C++11 since (I think) 5.6, so without C++11 5.9.1 will for sure not build.

Actually, Qt 5.6 was the last Qt version that didn't need a C++11 compiler [1][2]. Version 5.7 was the first one with that requirement.

[1] Except if you want to use QtSerialBus, which is a Technology Preview in Qt 5.6 and already required C++11.
[2] And it is the last version supporting Windows XP.

[jsulm]

@Alex_wang said in cross compile Qt5 source on DM8168/AM389x:

arago-2011.09/armv7a/bin/arm-arago-linux-gnueabi

Looks quite old. Can you get a newer one?

[Alex_wang]

@aha_1980 @jsulm

Thanks for your reply!

using the gcc-linaro-6.3.1-2017.05-i686_arm-linux-gnueabi tool chain , then solve the error!

but new error occur:

home/wangbi/workdir_project/workdir_Qt/rfs/lib -lgthread-2.0 -lrt -lglib-2.0 
.obj/qlogging.o:qlogging.cpp:function QMessagePattern::setPattern(QString const&): error: undefined reference to '__cxa_throw_bad_array_new_length'
.obj/qlogging.o:qlogging.cpp:function QMessagePattern::setPattern(QString const&): error: undefined reference to '__cxa_throw_bad_array_new_length'
.obj/qhash.o:qhash.cpp:function QHashData::detach_helper(void (*)(QHashData::Node*, void*), void (*)(QHashData::Node*), int, int): error: undefined reference to '__cxa_throw_bad_array_new_length'
.obj/qhash.o:qhash.cpp:function QHashData::rehash(int): error: undefined reference to '__cxa_throw_bad_array_new_length'
collect2: error: ld returned 1 exit status
Makefile:1247: recipe for target '../../lib/libQt5Core.so.5.8.0' failed

[jsulm]

@Alex_wang Did you start from a clean state?

[ambershark]

@Alex_wang Does your new compiler support exceptions and have exception handling enabled?

[Alex_wang]

@jsulm

yes