Cannot Use OpenCV With -std=c++0x/gnu++0x in Fuerte

asked 2012-10-24 14:34:24 -0500

ekaszubski
101 ●2 ●5 ●11

Compiling against OpenCV/FLANN in Fuerte/Ubuntu 12.04 amd64/gcc4.6 fails when using -std=c++0x due to this issue which has yet to be integrated into ROS; are there plans to pull this fix into ROS any time soon?

For example, the following simple test program:

#include <opencv/cv.h>

int main(){ return 0; }

when compiled with:

g++ opencv_test.cpp `pkg-config --libs --cflags opencv` -std=c++0x

will fail with:

error: ‘use_speed_’ was not declared in this scope

So far, I've been able to fix this issue by grabbing the latest OpenCV source (I'm using 2.4.9; issue was fixed in 2.4.3) and compiling/installing with:

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/opt/ros/fuerte

make

sudo make install

which appears to solve the issue, but is far from ideal. Are there any alternative workarounds for this issue? As far as I can tell, it is currently not possible to compile any code requiring both OpenCV and the c++0x/gnu++0x flag in fuerte out-of-the-box.

answered 2012-11-06 13:08:05 -0500

ekaszubski
101 ●2 ●5 ●11

OpenCV 2.4.3 just came out, so I went ahead and just packaged it myself and added provides/conflicts/replaces fields for ros-fuerte-opencv2 and ros-groovy-opencv2 (so no compiling from source, and it automatically uninstalls/replaces the existing ros-<version>-opencv2 package in a clean way).

I tested the packages on my precise+fuerte cleanroom and the basic program above compiles as expected; however, I have yet to test it with rosbuild. Presumably, since the opencv2 ros package (provided by vision-opencv) uses pkg-config to grab the cflags and libs, the flags from 2.4.3 should be pulled in and everything should just work.

So if anyone is interested, the debs (libopencv2.4 and libopencv2.4-dev, both version 2.4.3) for oneiric and precise are here, and setup instructions for the PPA are here.