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Trying to learn Eclipse C++ with CDT [message #732349]

Tue, 04 October 2011 10:57

Eclipse User

I'm trying to learn Eclipse CDT development. To do this, I'm developing a fairly large application, and the first part of it I'm implementing is a low-level C++ dynamic library (lib___.so).

I created a project in another workspace to test the library. I did this to ensure I'd learn how to include the dynamic library in the other pieces of my project as I'm developing it so that there are less surprises down the road.

To include the library, I went into the GCC C++ Linker options of the project and added the -L path to the library my library resides in and the -l library name (minus the lib prefix and .so suffix).

I also copied the header file for the library's interface into my tester project's workspace and #include it in my test project.

When I build, everything builds fine for the test project. The issue I'm having is that when I try to run or debug, the linker cannot find my .so dynamic library file.

Any ideas? (I'm using Eclipse Indigo 3.7.1)

Re: Trying to learn Eclipse C++ with CDT [message #733579 is a reply to message #732349]

Wed, 05 October 2011 02:36

Eclipse User

There are three options.
1) extend the environment variable LD_LIBRARY_PATH so that it contains the path to your shared lib
2) put the shared lib in /usr/lib or /usr/local/lib and run ldconfig to update the lib database of your system (only root can do this)
3) use rpath as linker option to embed it the library path into your executable (see http://www.eyrie.org/~eagle/notes/rpath.html )

Re: Trying to learn Eclipse C++ with CDT [message #733902 is a reply to message #733579]

Wed, 05 October 2011 18:08

Eclipse User

Thanks, Axel. I ended up extending the LD_LIBRARY_PATH variable and everything works fine now.

For future readers of this post, to extend the LD_LIBRARY_PATH permanently, which I had a little trouble figuring out, I had to create a config file and then run ldconfig, and restart the machine.

Re: Trying to learn Eclipse C++ with CDT [message #733965 is a reply to message #733902]

Thu, 06 October 2011 03:08

Eclipse User

Josiah wrote on Thu, 06 October 2011 00:08

Thanks, Axel. I ended up extending the LD_LIBRARY_PATH variable and everything works fine now.

For future readers of this post, to extend the LD_LIBRARY_PATH permanently, which I had a little trouble figuring out, I had to create a config file and then run ldconfig, and restart the machine.

You can change the LD_LIBRARY_PATH variable in Debug Launch Configuration of your application in Eclipse.

Re: Trying to learn Eclipse C++ with CDT [message #734079 is a reply to message #733965]

Thu, 06 October 2011 11:45

Eclipse User

Thansk for the pointer. I'll take a look at that way of doing it.

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