Question

I’ve tried looking at similar problems, but could not easily find one that helped my problem.

I’ve created a project in C++ and am working on UNIX to compile, link, and run it. My specific problem is an undefined reference to a method I declare in a separate file.

In the file SharedCache.cpp, I have the following method:

int SharedCache::replaceLine(ullong address){
    int evictPID = -1;

    int cacheSet = calcCacheSet( address );
    //random uniformly-distributed value for cache line
    float numLines = static_cast<float>(CACHE_LINES_PER_SET);
    uint cacheLine = static_cast<uint>(uniformDistr( numLines ));

    if(cache[cacheSet][cacheLine] != NULL){
        evictPID = cache[cacheSet][cacheLine]->PID;
    }

    uint PID= calcPID(address);
    uint tag= calcTag(address);

    cache[cacheSet][cacheLine]->setLine(PID, tag); //mutex method

    return PID;
}

The line uint cacheLine = static_cast<uint>( uniformDistr( numLines )); makes a call to the function I want to use from another file. The linker error is an undefined reference to this method.

uniformDistr( float ); is declared in the header distributions.h and defined in distributions.cpp. In my project options I set the linker flag -distributions and I also compiled the distributions.cpp to make sure a distributions.o file exists to link with.

From here, I don’t know where to go, because this has not solved the problem.

Answer 1

I’ve not used KDevelop, however, on the command line you would just add distributions.o as an input file to the linking process. No need for dashes or leaving off the .o extension.

Alternatively, can you just add distributions.cpp to your KDevelop project? That way it should get compiled and linked automatically (this is how it works in things like Visual Studio or Eclipse).