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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 SSL_library_init and SSL_load_error_strings

I am implementing a OpenSSL code and have already included required header files but still I am getting errors like * undefined reference to SSL_library_init I guess it's a linking error rather than a compilation error. I am implementing it in…
samprat
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Qt: Signals and slots Error: undefined reference to `vtable for

Following example from this link: http://developer.kde.org/documentation/books/kde-2.0-development/ch03lev1sec3.html #include #include #include using namespace std; class MyWindow : public QWidget { Q_OBJECT …
Aquarius_Girl
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OpenCV - undefined reference: SurfFeatureDetector and BruteForceMatcher

I'm making a program in C++ that uses 2 images to detect SURF Features, compute the matches with a bruteforcematcher and draws it. Here's the code #include #include #include #include "opencv/cv.h" #include…
Lennart-
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Undefined reference to mempcy@GLIBC_2.14 when compiling on Linux

I am trying to port an application to drive a device that uses an ftdi2332h chip from windows to linux. I installed the libftd2xx library on an ubuntu 10.04 system per these instructions. When I try to compile any of the sample programs I get the…
user1487551
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Undefined reference C++

I'm trying to compile my first legit program that I'm converting from Java (I ran a test hello world type program to check my compiler and it works). There are three files: main.cpp #include #include "skewNormal.h" using namespace…
Ryan Amos
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Undefined reference to printf when using GCC cross compiler

I'm trying to get the following simple 'Hello World' program to compile using a cross compiler (GCC 4.9.2) targeting mips: #include int main() { int x = 5; printf("x = %d\n", x); } The x variable is there to stop GCC changing printf…
pwaring
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Undefined Reference issues using Semaphores

I am playing around with using Semaphores, but I keep encountering Undefined Reference warnings, thus causing my code not to work. I pulled example code from a text, but was having issues with some of their syntax, so I went to POSIX's semaphore…
TheFatness
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Is there a sequence point between these assignments?

Is there a sequence point between the two assignments in the following code: f(f(x=1,1),x=2);
R.. GitHub STOP HELPING ICE
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g++ compile error: undefined reference to a shared library function which exists

I recently installed the hdf5 library on an ubuntu machine, and am now having trouble linking to the exported functions. I wrote a simple test script readHDF.cpp to explain the issue: #include int main(int argc, char * argv[]) { hid_t …
dermen
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Undefined reference to 'yylex()'

I'm trying to use flex and bison to create a simple scripting language. Right now, I'm just trying to get a calculator working. I can't get it to compile, though. When I run this makefile: OBJECTS = hug.tab.o hug.yy.o PROGRAM = hug.exe CPP =…
Micah
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C-callback to function template: explicitly instantiate template

Premise I’m using a C library (from C++) which provides the following interface: void register_callback(void* f, void* data); void invoke_callback(); Problem Now, I need to register a function template as a callback and this is causing me problems.…
Konrad Rudolph
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Another "undefined reference" error when linking boost libraries

I've seen several other posts that deal with this exact same issue. However, none of their solutions seem to work for me. I am compiling the following code: #include #include #include…
Joshua Hewlett
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Undefined reference to log10 function

I am building using Eclipse Kepler, and have included math.h. However, I am getting an error 'undefined reference to log10'. Also types uint8_t and unit32_t are not being resolved. I have included both stdint.h and inttypes.h, just to be sure,…
Aanchal Sahdev
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C code compiled with C++: undefined reference

I have a small program that I can compile with GCC and ICC without any difficulties, but I would also like the code to work with G++ and ICPC. I tried to add this: #ifdef __cplusplus extern "C" { #endif at the beginning and this: #ifdef…
Suugaku
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undefined reference when using experimental/filesystem

I am trying to compile a project with experimental::filesystem in visual studio code using code runner, however I can't get it to compile even in the terminal. The code is as follows, a very simple test usage from the docs: #include…
The Wizard Alt
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