Cross compilation : Rasp berryPi2

yuvaram

HI

Faced isse while cross compiling Qt for Rasp BerryPi

./configure -opengl es2 -device linux-rasp-pi-g++ -device-option CROSS_COMPILE=/home/ram/RPI/compiler/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf- -sysroot /mnt/raspberry-rootfs -opensource -confirm-license -optimized-qmake -reduce-exports -release -make libs -prefix /usr/local/qt5pi -hostprefix /usr/local/qt5pi

Error Message:
Creating qmake...
.cc1plus: error: unrecognized command line option ‘-std=c++11’
make: *** [project.o] Error 1

After online search about the issue , it tells old version og g++ compiler like g++ 4.6 and below. But i m using g++ 4.7

Thank you in advance

ambershark

@yuvaram You need 4.7 I believe for c++11.. Check to see if maybe your desktop g++ is getting picked up instead and if it's < 4.7 that could be the issue. Not the version but the fact that the desktop compiler is being used.

Can you do a quick test and try this:

$ mkdir xxx
$ cd xxx
$ echo "int main() { return 0; }" > main.cpp
$ /home/ram/RPI/compiler/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf-g++ -std=c++1 main.cpp

And see if that works. If it does than your cross compiler definitely supports c++11.

Do you have a clean build directory for Qt? You never built or configured with a different option or compiler before that test?

yuvaram

@ambershark said in Cross compilation : Rasp berryPi2:

/home/ram/RPI/compiler/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf-g++ -std=c++1 main.cpp

Thank you @ambershark
main.cpp compiled successfully.

ambershark

@yuvaram Ok so if that's the case your cross compiler definitely works with c++11, so that means your desktop compiler doesn't.

Check what compiler your using with g++ --version and if it's below 4.7, upgrade your compiler and you should be good to go. :)

You're probably running some really old linux if it doesn't have at least 4.7 though. I mean on arch I'm using 6.3.1. gcc 4 is a LONG time ago. CentOS/redhat or something really old would be my guess. Both CentOS and Redhat are really really far behind everyone else since they are going for "stable" linux platforms.

PeterJohn48115

Hi... I wanted to start cross compiling for raspberry pi2 on Ubuntu 32bit (in virtual box), so I downloaded the toolchain on the github site and tried to compile a simple hello world program with the command (I've included the path to the bin folder that contains arm-linux-gnueabihf-gcc-4.8.3 to the PATH variable.

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