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Questions tagged [undefined-reference]

A linker error caused by a missing definition of a symbol used elsewhere in a program

The most common causes are

  • Declaring but not defining a function, global variable or static data member
  • Not compiling or linking to an object file that contains the definition of a symbol
  • Forgetting to link to the library that provides the symbol
  • Listing a required library before the objects that depend on it (in the linker command libraries should be listed after the objects that depend on them)

There is a C++ FAQ question about undefined references in C++ and how to solve them.

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Undefined reference to methods in a certain class using templates c++

I have a class called SomeClass with a template someclass.hpp template SomeClass { public: SomeClass(T& it, int a): t(it), b(a) { CallMethod(); } static void PrintSomething() { std::cout << "static method in…
user592748
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Undefined reference in g++ linking

Every time I make a new module and try to link it to my main class (Estudiant.o) using this line: g++ -o red1.exe red1.o %OBJETOS_CPP%\Estudiant.o I get this error: red1.o:red1.cpp:(.text+0xd): undefined reference to Estudiant::consultar_DNI()…
Buradi
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C++ Phidget eventhandler undefined reference 'linker'

I am getting the following errors. Based on the last line I believe it a linker error. However, I really don't know what I am talking about. :) I'm a beginner. If you happen to spot any other crappy points please let me know! error: undefined…
atomSmasher
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Function declared in header not accessible in main file

I have a file structure as follows: interface.h --> interface.c | | effects.h --> effects.c | | main However, functions declared in effects.h are not accessible in main. Code snippets : main : #include…
asheeshr
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undefined reference to Class::method()

I'm using a framework called ROOT in my code, ROOT provides a large amount of libs, between then there is PROOF which should allow my code run in parallel. Should be defined in TProof.h a static method Open that starts the parallel environment. I'm…
RSFalcon7
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referencing global variables from inline assembly in gcc

I have the problem where the linker generates undefined reference errors from the inline assembly code. int global_var = 0; void myfunc() { asm(".intel_syntax noprefix\n"); asm("lea eax, global_var\n"); } I am compiling with -masm=intel and…
Vladimir Gazbarov
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cuda undefined reference to __constant__ array

i got the following problem using nvcc. I use separate compilation (finally got it running with cmake) and got a problem with the declaration of a __device__ __constant__ (extern) type1 var[length] array. Here is my header: #include…
soriak
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undefined reference - each object file compiles, but link fails

Possible Duplicate: static variable link error What is an undefined reference/unresolved external symbol error and how do I fix it? Sorry for adding yet another "undefined reference to" makefile problem post, but I couldn't find a solution even…
cmo
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undefined reference to ... - linking issues?

I don't know what I'm getting the following error: proc1.o: In function `procEx1': /cygdrive/c/armprojects/projekt/motor/proc1.c:45: undefined reference to `motorTest_test' collect2: ld returned 1 exit status make: *** [main.hex] Error 1 I've…
Petrus K.
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included cpufreq.h but shows linker error in linux c++

My problem is I am getting an undefined reference error in linux g++ cpufreq.h is in usr/include directory and I included #include . This has declaration for cpufreq_get_freq_kernel() But when I call cpufreq_get_freq_kernel(), it gets a…
Hasan SDSL
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Cygwin g++ build error: undefined reference to

I was trying to build a project (rar file) with NetBeans cygwin g++ compiler. I could build it by running make in the src/ directory under ubuntu. However, under cygwin, it kept giving me undefined reference to.... (Before compiling, I had changed…
Trantor Liu
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Undefined reference to namespace::class::constructor

I have the following code, and every time I compile, it's giving me an error saying that there is an undefined reference to ns::player::player() This has never happened to me before, so to be honest, I'm quite confused. I just know it's something…
Kyle R.
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Using an image map in Dreamweaver CS5 with a Jquery plugin

I'm currently trying to use an image map on a webpage I am building. When I draw the maps and add links, the page takes me to an an error for an "undefined" web address. I have multiple hotspots in one image, and I believe something with the jQuery…
ASUjustinb
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Linker error: undefined reference to

I keep getting the following: [Linker error] undefined reference to `ComponentClass::POSIZIONENULLA' ld returned 1 exit status [Build Error] [main.exe] Error 1 can somebody help me with this. Here is my code: ComponentClass.h #ifndef…
geraldCelente
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Undefined Reference for Pthread function in C

Possible Duplicate: undefined reference to pthread_create in linux (c programming) I am trying to implement Thread chain in Ubuntu in C. When I compile the following code, I get the errors of Undefined reference to these thread library function…
Alfred
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