topic Re: Cross Compile Opencv in i.MX Processors

Cross Compile Opencv

trendantenna — Mon, 25 Nov 2013 17:14:19 GMT

Hello everyone,

I'm trying to cross-compile an example of OpenCV 2.4.3 executing this:

arm-linux-gnueabi-g++ main.cpp -o test1 `pkg-config opencv --libs` `pkg-config opencv --cflags`.

It returns the following error:

/usr/local/lib/libopencv_calib3d.so: could not read symbols: File in wrong format

collect2: ld returned 1 exit status

I already got the OpenCV libs compiled for ARM, and I'm using a wandoboard.

LeonardoSandova — Mon, 25 Nov 2013 18:06:22 GMT

I think the compiler is trying to use your HOST lib, which is an X86 binary. The problem is on the linking phase, so may export something like this

export LD="<the arm loader> --sysroot=<the target filesystem>"

Then compile.

In the future, try either creating a Makefile or even better, a Yocto recipe, so you got all this environment variables loaded for you.

Leo

trendantenna — Mon, 25 Nov 2013 20:20:18 GMT

what do you mean by "the arm loader"?

LeonardoSandova — Mon, 25 Nov 2013 20:22:40 GMT

Sorry, I mean the linker

arm-linux-gnueabi-ld

trendantenna — Mon, 25 Nov 2013 20:36:31 GMT

instead of "the target filesystem" should I put mi root filesystem path?

LeonardoSandova — Mon, 25 Nov 2013 21:24:41 GMT

That is correct.

In fact, can you try compiling your code after running these steps: i.MX Yocto Project: How can I compile the kernel manually?

andre_silva — Sun, 02 Mar 2014 03:01:04 GMT

you can find the solution for Yocto and LTIB in the last 2 posts of this blog: http://imxcv.blogspot.com.br/

regards,

Andre