Linking errors installing and compiling ROS (OSX)

asked 2013-02-04 13:38:10 -0600

Hansg91
1889 ●51 ●65 ●87

Hello,

I was having some problems before with linking TinyXML to my package, which I got to work now, but after that I received weird linking errors:

  Undefined symbols for architecture x86_64:
    "ros::init(int&, char**, std::string const&, unsigned int)", referenced from:
        _main in MotorController.cpp.o
    "ros::spin()", referenced from:
        _main in MotorController.cpp.o
  ld: symbol(s) not found for architecture x86_64

As if ROS was not compiled or not compiled properly. So I wanted to try and reinstall/recompile ROS so that I could be sure it was up to date. However compiling gives me a linking error now too :

==> make -j8 -l8 in '/Users/hansgaiser/ros_catkin_ws/build_isolated/class_loader'
Linking CXX shared library /Users/hansgaiser/ros_catkin_ws/devel_isolated/class_loader/lib/libclass_loader.dylib
ld: library not found for -lPocoFoundation

I have no idea what PocoFoundation and why it is no longer found. All my system dependencies are met, according to rosdep and I am trying to compile a fresh install of ROS.

answered 2013-02-04 13:42:59 -0600

WilliamWoodall
1626 ●12 ●13 ●22

PocoFoundation is part of poco, ensure that poco is installed from homebrew (or what ever package manager you are using).

The first error can occur when you use the ros headers (ros.h) but do not link against the ros library. It might be that your package does not find_package(...) and then target_link_libraries(...) roscpp.

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You are probably correct about the first error, but according to homebrew poco was installed. I uninstalled and reinstalled it but this did not solve the error. I see the libs are located at /usr/local/lib and /usr/local/Cellar/poco/1.4.5/lib.

Hansg91 ( 2013-02-04 14:06:57 -0600 )edit

Do you have /usr/local/lib/libPocoFoundation.dylib?

WilliamWoodall ( 2013-02-04 14:41:17 -0600 )edit

Yes, /usr/local/lib/libPocoFoundation.15.dylib /usr/local/lib/libPocoFoundation.dylib /usr/local/lib/libPocoFoundationd.15.dylib /usr/local/lib/libPocoFoundationd.dylib Those are the files that I have there.

Hansg91 ( 2013-02-04 22:13:38 -0600 )edit

In that case, I can only guess that the state of your build is stale, please remove your build and devel folder and rebuild everything in a clean terminal environment.

WilliamWoodall ( 2013-02-05 09:22:36 -0600 )edit

I don't know what exactly caused it, but I removed everything I could and started over, it seems to be resolved now. I believe the first error is also resolved by depending on roscpp. Now I have a new boost linking error, but thats for a new question.

Hansg91 ( 2013-02-05 22:07:40 -0600 )edit

Most likely you built your workspace, then changed something in brew (uninstalled/updated poco) and then tried to build again with out of date information.

WilliamWoodall ( 2013-02-06 06:23:28 -0600 )edit

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