C++ – Referencing 3rd party Libraries using relative paths in Eclipse-CDT

ceclipse-cdt

what is the best practice to reference 3rd party C++ components (e.g. includes, libraries) using relative paths in Eclipse-CDT?

I'm trying to reference Boost and Google protobuf.
I've put them each in a folder in my workspace, e.g. /home/user/workspace/boost_1_39_9
I've added a reference to that folder under build settings in the project properties, BUT eclipse won't let me specify that path as relative to the workspace folder, I have to choose it using filesystem and specify an absolute path

thanks,

Alex

Best Answer

Eclipse variables, such as ${workspace_loc} and ${project_loc} only work for things that are actually in the runtime Eclipse workspace. When you say you put them under the workspace in the filesystem, did you actually import the files into Eclipse (using new Project; or creating a linked folder in an existing project)?

If the files exist in the filesystem but not in Eclipse itself then Eclipse will only be able to access them with absolute paths.

BTW, CDT has variables of its own: ${WorkspaceDirPath} ${ProjDirPath} ${ProjName} which expand to the particular filesystem location.

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C++ – Eclipse CDT: How to reference 3rd party includes via a Relative path

When adding an include file path in the CDT project (Project Properties/C/C++ General/Paths and Symbols), there are 3 buttons to browse for a location:

Variables...
Workspace...
File system...

If you press the Workspace... button, the path will be relative to the workspace/project. If you select the Variables... button, you'll get to incorporate variables such as ${WorkspaceDirPath}. The variables can also reference environment variables, which might be handy if you want a single install of boost to be referenced from projects that might reside anywhere on your machine.

If you incorporate variables into the path, make sure the "Is a workspace path" option is checked - otherwise the variable seems to get evaluated when you press "OK" instead of staying a variable to be evaluated at build time.

C++ – GCC C++ Linker errors: Undefined reference to ‘vtable for XXX’, Undefined reference to ‘ClassName::ClassName()’

This linker error usually (in my experience) means that you've overridden a virtual function in a child class with a declaration, but haven't given a definition for the method. For example:

class Base
{
    virtual void f() = 0;
}
class Derived : public Base
{
    void f();
}

But you haven't given the definition of f. When you use the class, you get the linker error. Much like a normal linker error, it's because the compiler knew what you were talking about, but the linker couldn't find the definition. It's just got a very difficult to understand message.

Best Answer

Related Solutions

C++ – Eclipse CDT: How to reference 3rd party includes via a Relative path

C++ – GCC C++ Linker errors: Undefined reference to ‘vtable for XXX’, Undefined reference to ‘ClassName::ClassName()’

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