Home > Undefined Reference > Link Error Undefined Reference

Link Error Undefined Reference

Contents

share|improve this answer answered Apr 13 '15 at 16:42 Nima Soroush 2,70012333 Countryman your answer was nice –stackprogramer Jul 10 at 13:40 add a comment| up vote 20 down So I posted my answer here instead. –Malvineous Jan 17 '15 at 14:00 That question already has an accepted answer. Notice, however, that the message makes sense only in the context of the program. The Cprogramming.com ebook, Jumping into C++, will walk you through it, step-by-step. have a peek at these guys

A single error near the top of your program can cause a cascade of other compiler errors because those lines might rely on something early in the program that the compiler Would you like to answer one of these unanswered questions instead? In VC++, every source file (.cpp,.c,etc.) is considered as a translation unit, the compiler compiles one unit at a time, and generate one object file(.obj) for current translation unit. (Note that To avoid this problem, take some care when writing declarations and definitions, and remember that things like references, pointers and const all count towards making a function signature unique. http://stackoverflow.com/questions/14557657/linker-error-c-undefined-reference

Undefined Reference To C++ Error

Windows Application projects to such entry point function (as specified in the missing reference above), instead of the commonly used int main(int argc, char** argv); signature. You then compile B, which will succeed and generate B.lib. more hot questions question feed lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation

On Windows that same file might be called foo.lib, but you'd use the same argument. When I re-built, the error went away. Compile! Linker Error Undefined Reference To Function In C Order of compilation is undefined.So you must not assume that the file main.cpp is compiled first If .cpp files depends on additional .h files in order to find symbols that may

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Undefined Reference To Function C++ A corresponding definition would be: int x; For example, the following would generate an error: extern int x; int main() { x = 0; } //int x; // uncomment this line Once I had these error messages, I found several issues with the stricter compiler settings on the Web IDE which complained a lot about psMalloc()/psRealloc()returningvoid* which is unsafe to convert into learn this here now This issue can come up in one of several ways: first, there might actually be two definitions of an object--for instance, two global variables both declared as external variables to be

View Results Poll Finishes In 2 Days.Discuss in The LoungePoll History About Us | Advertising Info | Privacy Policy | Terms Of Use and Sale | Copyright Policy | Contact Us© C++ Undefined Reference To Constructor If you want to write a program that has a int main() function in it, always make sure that you choose “Console Application”, otherwise the IDE may configure the linker to The linking phase is responsible for finding the symbol and correctly linking it to b.cpp (well, actually to the object or library that uses it). asked 4 years ago viewed 29101 times active 4 years ago Linked 712 What is an undefined reference/unresolved external symbol error and how do I fix it? 0 undefined reference returning

Undefined Reference To Function C++

You'll generally want to look for how to tell the compiler where to look for libraries and make sure that the libraries were actually installed correctly. I also had the same problem (with the same solution) for libxml2, libiconv and glew. Undefined Reference To C++ Error Browse other questions tagged c linker-error or ask your own question. C++ Undefined Reference To Class Damn, you think, I guess I have to figure out what this all means...

What is the meaning of the so-called "pregnant chad"? More about the author Lack of research or effort. How to unlink (remove) the special hardlink "." created for a folder? Update your command to include the file which contains the definition of that function and it should work. Undefined Reference Error In C

USB in computer screen not working What is a Waterfall Word™? The order in which libraries are linked DOES matter if the libraries depend on each other. How can the compiler know this at all? check my blog in a manual makefile) or may fail (e.g.

In fact, you should almost never start trying to fix errors from the end of the file to the beginning for one simple reason: you don't know if they're actually errors! Undefined Reference To Static Variable C++ For example, assuming "grades" is a vector of some kind, the warning is generated by this code for (int i = 0; i < grades.size( ); i++ { // body of Function/variable declared as class member, defined as global (or vice versa).

In this case, we know that foo() has its definition in a.cpp, but different from the one we are calling(different return value).

To get it look more like gcc ones, for example. –TankorSmash Dec 4 '13 at 4:43 1 @TankorSmash If only. What is symbol? Common error messages are error LNK2001, error LNK1120, error LNK2019 for MSVS and undefined reference to symbolName for gcc. Undefined Reference To C++ Linux All this for a single character!

Re-compiling A will now work because B.lib is now found. The error message tells you that none of the object files you're linking against contains a definition for avergecolumns. How to know if a meal was cooked with or contains alcohol? news The correct solution is to hope the developer releases an updated package and then upgrade, but it worked for me by hacking in an extra setting for VS2013, pointing at the

This usually happens when two (or more) libraries have a cyclic dependency.