12 replies to this topic

[Flying Dutchman]

So, I'm working on my own mini library (wrapper mostly) and got some issues. Among others, I have Socket and Timer class. And since I'm a bit lazy I'm not working on portability as seperate files but like this:

void Timer::Sleep(int milisec) {

#ifdef _WIN32

    Sleep(milisec);

#else

    usleep(milisec * 1000);

#endif

}

Code compiles, but when I run the program it crashes and I've no idea why. Next problem I have is with Socket class; again the code compiles but when I try to run it I get undefined reference errors to Win API functions like undefined reference to `_WSAStartup@8', undefined reference to `_socket@12' and so on.

I'm following Static Libraries: (.a) method found here

Any help would be much appreciated.

[Alexander]

What are your compiler flags?

[dargueta]

You're saying that it's barfing on Win32 functions when linking on a NIX system? On a whim, try
#if defined(_MSC_VER) && defined(_WIN32)

[Flying Dutchman]

@Nullw0rm, I'm using

g++ -Wall -c socket.cpp timer.cpp

and then

ar -cvq lib.a socket.o timer.o

@dargueta, I'm on Windows, but trying to make it somewhat portable should I need it on a unix systems.

[dargueta]

Oh wow...I just remembered I had this problem before and completely forgot the solution (which I just remembered). You need to link either winsock.lib or ws32_2.lib depending on what version of Windows and/or Visual Studio you're running. I'm assuming you're using VS, right? I don't know the way to link right now because the stuff I've found is really convoluted. Then again, that's Microsoft for ya. There's probably a "References" dialog in the Project Properties section, so add winsock.lib first and try compiling with that. If that doesn't work then try ws32_2.lib. Do not use both.

With g++ add the -lsocket -lnls options wherever you like.

[Flying Dutchman]

I'm using Code::Blocks and have -lwsock32 flag under linker options but I guess I should use it when I'm compiling lib, right?

[dargueta]

Compiling any part of your project.

[Flying Dutchman]

I'm not good at manual compiling, but when I tried

g++ -Wall -c timer.cpp socket.cpp -l wsock32

I got g++: -lwsock32: linker input file unused because linking not done error. Am I doing this right? I forgot to mention earlier, I have code, for sockets, which uses Win API and it works fine; the only difference is that here I don't use #ifdef _WIN32 directives. Both files are not under any project and one where I don't use preprocessor directives, works.

[dargueta]

Are you using g++ on Windows?

[Flying Dutchman]

dargueta said:

Are you using g++ on Windows?

MinGW 5.1.6, shouldn't I?

[dargueta]

If you're using g++ on Unix, that shouldn't link at all. You need to use

g++ -lsocket -lnls <other options and stuff here>

Those are lowercase L's by the way.

[Flying Dutchman]

Now it's just *.hpp files, no lib's, and it works fine, even with preprocessor directives. Anyways, thanks for help.