Undefined reference

[vysero]

I am getting an error when I try to use the method in this header file:

  undefined reference to 'SuiteVersions::bProductionBuild()'

I included the header and here is how it's defined in that header:

extern bool bProductionBuild();

and in the c file:

  bool bProductionBuild()
  {
    using namespace CTStringOps;
    return startsWith(clGetCVSTag(), _T("tags/"));
  }

perhaps there is something about 'extern' keyword that I don't understand? Here is how I am trying to refer to it:

#include "GuiSettingsPresenter.h"
#include "Core/PluginInterfaces/SettingsPluginInterface.h"
#include <QtCore/QSettings>
#include <SuiteVersions.h>

namespace BlackWall
{
  namespace Ui
  {
    GuiSettingsPresenter::GuiSettingsPresenter(Core::SettingsPluginInterface* _model)
      : m_model(_model)
      ,m_productionBuild(false)
    {
    }

    bool GuiSettingsPresenter::productionBuild() const
    {
      return SuiteVersions::bProductionBuild() ? m_productionBuild : !m_productionBuild;
    }
  }
}

The error is on line 18.

[jlb]

I am getting an error when I try to use the method in this header file:

So what is SuiteVersions referring to?

and in the c file:

Why are you using a C file? That function appears to be a C++ function, not a C function.

perhaps there is something about 'extern' keyword that I don't understand?

Probably, what do you think the extern qualifier is going to accomplish?

Please post the complete header, and the complete implementation file for that function.

[dutch]

"undefined reference" indicates a linker error.
How exactly are you compiling your project?

[vysero]

@dutch Yes that's exactly what it was. I needed to include the lib in the .pro. This has been resolved, thanks guys.