Error while building app in cross-compiled qt in raspberry

2
votes

I'm trying to build and app on a cross-compiled qt5 in a raspberry pi. This app is based on this rf24l01 library. When I compile a cpp program from the RPi, everything works fine, but when I tried from my pc running ubuntu 12.04 (32bits) the following error is through:

error: cannot find -lrf24-bcm

I point to the library using this line in the pro file:

LIBS += -L/mnt/rpi/usr/local/lib -lrf24-bcm

AFAIK, this is the path where the lib is located:

This is the result of `ls /mnt/rpi/usr/local/lib:

librf24-bcm.so      libwiringPiDev.so      libwiringPi.so.2.0
librf24-bcm.so.1    libwiringPiDev.so.2.0  python2.6
librf24-bcm.so.1.0  libwiringPi.so         python2.7

Finally, this is the appeared error in detail:

/home/atron/opt/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf-g++ -Wl,-rpath-
link,/mnt/rpi/opt/vc/lib -Wl,-rpath-link,/mnt/rpi/usr/lib/arm-linux-gnueabihf -Wl,-rpath-
link,/mnt/rpi/lib/arm-linux-gnueabihf --sysroot=/mnt/rpi -Wl,-rpath,/usr/local/opt/lib -o homekit main.o -L/mnt/rpi/usr/local/lib -lrf24-bcm -L/mnt/rpi/usr/local/opt/lib -lQt5Network -L/usr/local/opt/lib -lQt5Core -lpthread
/home/atron/opt/gcc-4.7-linaro-rpi-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/4.7.2/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lrf24-bcm
collect2: error: ld returned 1 exit status

What I`m doing wrong?

Thanks in advance,

1
c++qtgccraspberry-picross-compiling

1 Answers

0
votes

I don't know if this is "technically" correct, but solved my problem. The main idea is create a symbolic link of the library to my pc /usr/local/lib folder:

sudo ln -s /mnt/rpi/usr/local/lib/librf24-bcm.so /usr/local/lib/librf24-bcm.so
sudo ln -s /mnt/rpi/usr/local/lib/librf24-bcm.so.1 /usr/local/lib/librf24-bcm.so.1
sudo ln -s /mnt/rpi/usr/local/lib/librf24-bcm.so.1.0 /usr/local/lib/librf24-bcm.so.1.0

Then, on QT creator *pro file you only need to add the lib reference:

LIBS=-lrf24-bcm

I hope this could help to some newbie like me. Regards,