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Asked: 2026-05-27T02:49:44+00:00

At first: I am not using an already compiled library. Here’s the situation: I’ve

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At first: I am not using an already compiled library.

Here’s the situation: I’ve got a C++ project in eclipse CDT that has a folder structure like this:

project
  somefoldername
    src
    include
  library
    src
    include

somefoldername/src and library/src are defined as source folders and somefoldername/include as well as library/include are defined as include folders (under C/C++ General->Paths and Symbols, which also affects the compilers -I option).

The “library” folder contains the source code of a library used by my own code (which can be found in “somefolder”). Well, compiling of the whole project works fine, but linking crashes with a whole bunch of “undefined reference” errors in the library’s source.

The undefined reference errors occur, although *.o-files are created in which the missing functions should be found – and also are passed to the linker afterwards.

What am I doing wrong?

Edit: Updated to current configuration and the attempts to solve the problem.

Edit2: The accepted answer helped me out a bit, but the biggest problem seemed to be the “linking everything at once”-policy followed by eclipse. I went to autoconf and built the library first, before linking it to the main application. Although it’s more work, it’s a cleaner approach.

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1 Answer

  1. Editorial Team

    Three possibilities:

    1) The “undefined” symbols aren’t actually in your library

     This is unlikely, but you can verify using the "nm" Linux command

    2) You aren’t setting the library search path (“dash-big-L”) correctly in Eclipse

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