<artificial>: undefined reference - Libraries - PlatformIO

You cannot separate the compilation of the function template from its declaration. Function templates are only compiled when they are used with a specific template argument, we call that instantiation. Aug 02, 2014 · undefined reference to function that is defined in header file. Rate this: Please Sign up or sign in to vote. See more: C. I am getting undefined reference to sum in Since you are creating a final executable, you need to have a main program, one where the execution can start. Either you need to have a Fortran program that is the main program, or a C program. Apr 20, 2011 · Welcome to LinuxQuestions.org, a friendly and active Linux Community. You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features.

So there is no place in memory where b actually resides (the reference is undefined). To deal with this, you have to manually declare it in a cpp file, with the syntax int A::b; . This way you are reserving some space for that variable

Common C++ Error Messages #2 – Undefined reference | Late

The first says there is a function but the argument list is not specified (it's not a variable arguments function, but the number and types of the arguments are not specified). The second says the function takes no arguments. Don't use the empty parentheses notation in C. Note that in C++, empty parentheses mean the same as (void).

Consider the following two C++ programs. In the first file, we make use of the “print ()” function which is defined in the second file. When we compile these files separately, the first file gives “undefined reference” for the print function, while the second file gives “undefined reference” for the main function. C++ - C++: undefined reference to [function] [duplicate]