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Description of Problem, Request, or Question. Thank you for your help. You don't mention what the new library is that you are using to replace the startup files. My problem is that: I want to write a class called Cao and call its function from the Ros file which contains the main, but when I try to catkin_make it gives me the error: undefined reference to `Cao::SayHello ()'. In this tutorial, we will discuss three types of errors that are critical from any C++ programmer's point of view. The error: undefined reference to function show () has appeared on the terminal shell as predicted. But in the loop you pass in a float ( float index ). Next message (by thread): [CMake] undefined reference to `_exit'. Segmentation fault (core dumped) Unresolved external symbol. I'm following a book tutorial to add slider and mouse events to an interface with OpenCV and C++. In any case, I think your .hpp looks OK, except you need to declare action() as pure virtual already there, but I'm not sure if the way you've written your .cpp is legal - I've never seen a class redeclared like that in the .cpp. Hello, I am experiencing some strange behaviour in Xilinx SDK 2018.2 with a Standalone OS project for A53. In your CMakeLists.txt file, add. Hey there! Feel free to replace the output and input filenames. I know that it has to do with linker errors, but since I'm . main is the start point for any C based application, and it can't run without it. This is a linker error, and it's telling you that the main function that it needs in order to run your code isn't there. Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site We will discuss the possible causes of each of these errors and along with the precautions that we can take as a programmer to prevent these errors. 27. project(test) cmake_minimum_required(VERSION 2.8) set(SOURCE_FILES main.cpp) include_directories( test2 ) #here link_directories(test2) add_subdirectory(test2) add_executable( ${PROJECT_NAME} ${SOURCE_FILES} ) CodeProject, 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 +1 (416) 849-8900 The problem I have is that when I run make after I've run cmake, I get undefined reference errors for any instance in which I try to use one of the two libraries. Since this is also making this question a duplicate of [2] I decided to delete it in stackoverflow. find_package (JNI REQUIRED) target_link_libraries (games_test_system $ {JNI_LIBRARIES}) instead of choosing the directories manually, you can also rely on CMake: include_directories ($ {JNI_INCLUDE_DIRS} Alex Cohn 54310. Thus, you will change the command to: Thus, you will change the command to: gcc -g -O2 -fopenmp -L/usr/lib -o lenstool_tab e_nfwg.o lenstool_tab.o midpnt.o nrutil.o polint.o qromo.o read_bin.o lenstool_tab.o -lcfitsio -lm You need to add a reference to the SDL library. statsType (string); //accept a filename, set setSize to 0 . This is not CMake - this is really C++. the > path to the library is also correctly seen. Getting undefined reference error despite of having the library specified in CMake Usage Coderx7 September 22, 2020, 5:44pm #1 Hello everyone, hope you are having a great time. He helped build .NET and VS Code Now's he working on Web3 (Ep. When we initially downloaded the source code for netcat on MS Windows, we used Microsoft's Visual Studio.Net to compile it. Undefined reference. I followed instructions in "Getting started with Raspberry Pi Pico". When I add Q_OBJECT to my class declaration header, I get undefined reference to vtable for babel::MainWindow. 6 When I try to compile my program with make, I am getting an undefined reference to main error. This is the node.cpp code : (The error happens when I try to create an object from the class SBGInsIg500N). Here, I have 2 programs, sample1.cpp and sample2.cpp. Instead, use ${CMAKE_CURRENT_SOURCE_DIR} whenever you want a path relative to the CMakeLists.txt. Although, I got it to work I still do not understand why I need to link my application to the OpenFOAM libraries. Include mongocxx drivers with Cmake results with undefined methods on Ubuntu Hot Network Questions Right hand descending scale F# key finger 3 vs. 4 Since the absence of a main I've declared the class a library adding this line in the CMakeLists.txt: I'm calling the SayHello . Package Details (Include if Applicable) Package Name/Version: Qt/5.11 Operating System: Linux Fedora 28 Compiler+version: gcc-8.1.1 Steps to reproduce (Include if Applicable) Undefined reference to pow despite linking to libm. The solution to the undefined reference errors is to set the -specs=nosys.specs flag as mentioned here [2] in combination with not using the -nostartfiles flag which made the _exit referenced in nosys.specs not being used. And yeah - not the easiest thing on Earth . I'm trying to create a test executable out of a library I made. Thankfully, able to compile against the MinGW tool with small modifications. Weird . For example: When building a "blink" example, I'm getting "undefined reference to `_exit'" error: [main] Building folder: blink [main] Configuring folder: blink [main] Changes were detected in CMakeLists.txt but we could not . For example function parse_args(arguments*, int, char**) is already defined in the src/traceroute.cc So, we used to show (), i.e., small case names to go further. Solution 1. The Overflow Blog Introducing the Overflow Offline project. $ gcc exp.c To solve this error, simply open the file and make the name of a function the same in its function definition and function call. Nowadays you need to specifiy this explicitly as explained here. cmake; undefined-reference; itk; or ask your own question. I have included their headers as such in the main project header: #include /path/to/header/1.h #include /path/to/header/2.h. Based on the cmake tutorial 499) Featured on Meta The 2022 Community-a-thon has begun! If I follow you correctly you are trying to replace the startup files that are normally used with your own versions. I am using the Windows MinGW64 i686-8.1.-posix-dwarf-rt_v6-rev0 compiler and have installed Qt 5.15.2. #include <windows.h> int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevIns, LPSTR lpszArgument, int iShow) { // put your game code here } Maybe try more standard approach, like: Recent Posts: Lynxbee - Android, Embedded Linux, WordPress, SEO, Digital Marketing 15,073 Don't assume that the directory containing CMakeLists.txt is the current directory at runtime. . Lets name them lib1 and lib2. When using CMake to build my proje The libraries being linked to should be specified after there is a reference to them. I installed the newest Pico SDK 1.4.0 on Ubuntu 22.04 (x86) with GCC 10.3.1 and CMake 3.21.4. undefined reference with shared library using cmake; undefined reference with shared library using cmake. My Cmake file below: cmake_minimum_required(VERSION 3.6) [Solved]-Undefined reference to function CMake-C++ [Solved]-Undefined reference to function CMake-C++ score:13 Accepted answer Make sure that your test CMakeLists.txt links to the created library. Yet, main exists within my src directory, and I feel lost as to what I'm doing wrong. mrfloor changed the title [Caffe2] Link caffe2 in cmake for compilation in c++ [Caffe2] compilation in c++ undefined reference to `caffe2 Jun 12, 2020. Without the loop you pass a double type number to cos () (because you say cos (3.14) and not cos (3.14f) ). One way to fix this is to change your main () to. In the above codes, we have function name () that function is declared using some arguments but in the main method, the function is called without arguments . Next to linking to this minimal set of OpenFOAM libraries, the important magic here is -Xlinker --no-as-needed.In old versions of g++ this option was the default. Save this updated code to compile it. > the linker fails on the startup code: > > scanning dependencies of target testapp > [ 50%] building cxx object cmakefiles/testapp.dir/src/main.c.obj > [100%] linking cxx executable testapp > /opt/gcc-arm-none-eabi-7-2017-q4-major/bin/../lib/gcc/arm-none- > Also you have created a Windows application instead of a console app. c++ linker cmake. Intellisense doesn't give me any errors. When I added sample2 to my CMakeLists and tried to compile it, I encountered this : [ 25%] Building CXX object CMakeFiles . Undefined reference error is thrown by the linker rather than the compiler It's usually caused by the reference to the function that has been declared, but a definition can't be found Investigate linker error messages which can help to pin down the identifiers that are related to the cause of the problem Summary. Since it's an "undefined reference" error, I checked the methods names for any typo but found none and I also checked my code files to be sure the correct header files we're included and everything seems fine. Thank you for your reply. The standard startup files provide _init and _fini. Since then downloaded MinGW and gained some familiarity with that tool, as well. #ifndef STATSTYPE_H_INCLUDED #define STATSTYPE_H_INCLUDED using namespace std; template <class myType> class statsType { int setSize; myType *dataSet; string fileName; public: statsType (); //set the filename to the empty string, the setSize to 0, and dataSet pointer to nullptr. 3 solutions Top Rated Most Recent Solution 2 The problem is that you have only a cos (double) function in your math library but you are trying to call a cos (float) function in the loop. undefined reference to `QQuickWidget::QQuickWidget (QWidget*)' undefined reference to ` QQuickWidget::setResizeMode (QQuickWidget::ResizeMode) '. With windows and Linux library files: And I am using MingW for the toolchain: The issue I am having is the fact that My Cmake file is doing something wrong, I got the includes to work just fine but there is some issue with linking. You can find that information at the top of the class documentation in the small table under the short documentation. But cmake failed with. I assume that add_executable ( [title] [source]) is the command used to add source files to the compilation. Probably, you aren't compiling the right file, or you need to link this file output with other files - including the one containing . how did you specify lib path? 26. berak (Jun 8 '18) edit I had rerun cmake but I sill have undefined reference even if with this CMakeList Undefined reference to function CMake 47,678 Solution 1 Make sure that your test CMakeLists.txtlinks to the created library. I get "undefined reference to pow" and "undefined reference to log" errors despite including math.h and linking to libm as well. I'm working in terminal Ubuntu and compile my project with CMake. but I still have the errors azdoud.y (Jun 8 '18) edit you also have to run cmake again berak (Jun 8 '18) edit pro tip: mark your code with mouse, and press ctrl-k here, to format it nicely you also got 2 add_executable lines there, bad ! QQuickWidget is in quickwidgets. Linux. I am a beginner learning how to use CMake in my VSCode C++ projects and I'm having some issues getting my code to compile properly. Copy link Contributor agolynski commented Jun 12, 2020. it's worth mentioning the environment you are using, e.g. Accepted answer. c c++ "undefined reference to ". Now, sample1 worked just fine I can run it properly. The undefined reference is one of the predefined errors from the functions and it is used to call whenever the format of the method linked not correctly to the object creation of the codes. Mobile app infrastructure being decommissioned . Adding the -pthread option to the compiler commands allows the compiler to execute the code with the pthread.h library. I also have these variables passed in to Cmake