Cmake shared library undefined reference. cpp Makefile Added in version 3.

Cmake shared library undefined reference 27: To link with a shared library on macOS, or to a shared framework on any Apple platform, a linker import file can be used instead of the actual shared library. This library type is by default compiled without position independent error while loading shared libraries: libyaml. I also tried to view the symbols defined in Lib2 using nm -C and noticed its OK. Jul 2, 2024 · Goal: create a shared library containing my CUDA kernels that has a CUDA-free wrapper/header. 4. 1. To mirror what I had in the other cmake project I organized the code such that all source was placed into a src subdirectory and all headers in an include subdirectory. If you use your library yourself, then you do not But there is one big but :): Checking for undefined symbols in the generated shared libraries show me the short list of standard functions - here are the outputs for the shared libraries: $ nm -D --undefined-only libsundials_cvode. add_library(xscommon SHARED IMPORTED) add_library(xscontroller SHARED IMPORTED) add_library(xstypes SHARED IMPORTED) How to create a library in cmake out of two file List the libraries you want to link in the target_link_libraries section of your CMakeLists. txt:. But it never gets back to funcc_lib. In the main file, I This line: target_compile_definitions(uSockets INTERFACE LIBUS_USE_OPENSSL) defines the LIBUS_USE_OPENSSL symbol for targets that link to uSockets. Is not the same as Share Add a Comment. so file. so files correctly! c++; cmake; linker; ld; tbb; Share. Related. Clion linking fails. 9. cpp test program. The linker presumes all libraries to begin with lib, so to link to libm you link to m. txt │ │ │ └── include I am trying to compile a c++ project referencing Python using CMake. Why is my shared library not linking these are the files of my code [azdoud@video-processor prototype02]$ ls Adfeature. Improve this answer. It is correct that -pthread is an option and the best way to handle this. mk. ; Either of these should work for you. Hi, First, I would like to say I’m new to using CMake to there might be an obvious solution to this that I’m missing. 0-6ubuntu1~16. txt file in the root folder and have it applied to all subfolders. And definitely don’t set variables like CMAKE_C_COMPILER_WORKS, that’s going to bypass CMake’s various toolchain checks and you’re more or less lying to CMake when you set those (and those variables are not documented for public use anyway). # CMakeLists. You could also use weak Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog To fix it you should use the same library on in app and library. This way llama. You use this directive after the target MY_PROGRAM is added - the target MY_PROGRAM is added prior link_libraries. Lib_A depends on Lib_B The Lib_A defines symbols: Lib_A1 and Lib_A2, and the Lib_B defines symbol Lib_B1 and Lib_B2. Ask Question Asked 9 years, 6 months ago. e. The generation of these linker import files, as well as their consumption, is controlled by this property. In general I suggest to stick with default choice made by your compiler when possible and only switch to I have the following app being built and linked using CMake. txt files in subfolders. This is an issue how the linker optimizes the output code. to find a solution but I have not been able to solve my problem. So I manually added -lvdo_slam in the CMakeList. txt CMakeFiles cmake_install. txt file: cmake_minimum_required(VERSION 3. so file and its relevant headers. After stumbling on this same exact problem, I ended up finding a solution to this. Marked with purple are CMake packages. The first is to define dummy_gpu using C linkage, so change your my_cuda. target_link_libraries(prog funcc_lib funccpp_lib) It first links funcc_lib and then funccpp_lib. cpp file Cmake Linking Shared Library: "No such file or directory" when include a header file from library. For example if you are calling a function where the implementation is in an example runtime library "libfunc. Examples: /usr/bin/ld: c++; opencv; cmake; undefined-reference; SDL3 CMake linkage problem undefined reference for SDL. 4. 0 20160609 (Ubuntu 5. The first argument makes sure that you have not forgotten to state a dependency to a runtime library (which may also be a dependency that a runtime library has to another runtime library). cpp) target_include_directories (CelestialBody PRIVATE ${CMAKE_CURRENT_LIST_DIR}) target_include_directories (Planet PRIVATE ${CMAKE_CURRENT_LIST_DIR}) Eureka! I found a solution although it's not an ideal one. You can link to these directly. It covers three scenarios: (1) Calling GCC directly from the terminal, building Feb 4, 2020 · I am trying to link with a DLL executable using CMake. Viewed There are two possible approaches: Move the globals into a separate DLL that is referenced by both Host and Plugin. cpp I see in your commit 830adbe97f07 that you added lines like #include "qschematic_export. To accomplish this we need to add BUILD_SHARED_LIBS to the top-level Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. cpp is done, then it gives me several undefined reference errors which should not have happened as everything has already been defined. so: $(OBJECTS) $(LD) $* $(LDFLAGS) -shared -o Check out the linker option -z defs / --no-undefined. Once I changed the . Modified 6 years, 1 month ago. Step 10: Selecting Static or Shared Libraries¶. ) and my file referencing these functions is a . GameCenter) you need to have a "Link Binary with Libraries"-buildstep and then link with "GameKit. I've built a shared library which references the FFMPEG libraries. There are two solutions to this problem. All other files Jun 8, 2018 · even though adding include_directories (dir of the code) in CMakeLists. Let's ignore header files for now, as they can be all included in your source files. modern gcc versions on shared library platforms will prefer shared libraries over static libraries automatically, only falling back to static when either no shared version is found, or the -static option is specified. I've got a project that looks like this: ├── Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The last remark about static linking isn't true. With how the build worked this was fine for "normal" compilation (referencing the include directory), however insufficient for moc. Making statements based on opinion; back them up with references or personal Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Community support is provided Monday to Friday. CMake Linker: Undefined reference even though library is linked Related. undefined reference to `boost::system::generic_category()' when adding boost/asio. target_link_libraries(${TARGET_NAME} PRIVATE gcov) undefined reference to `shm_open' using CMake. And, if those needed libraries are the same ones as used when libsec-common. In OpenSSL 3, SSL_get_peer_certificate is just a macro for SSL_get1_peer_certificate and EVP_CIPHER_iv_length is a macro for EVP_CIPHER_get_iv_length. If you still have these Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog The first sentence in the manual link_libraries. Since I want to take advantage of the neon capabilities of the pi, Can anyone help me fix this issue? Thanks! Here is a list of steps that I followed that leads to the error: To fix it you should use the same library on in app and library. Indeed it links with the pthread library as many answers Background. txt file we were missing. The idea is that you build modules in CMake, and link them together. As a C (or C++) application developer, you can speed up your application development, by integrating shared libraries into your application. 0 Ubuntu 16. So, for any target that links with a library that uses dlopen, etc, invoke: target_link_libraries(MY_TARGET LIB1 LIB2 Make sure cmake properly locates libraries during generation stage: Cmake linking to shared library cannot find library. so library signals about problems with library itself or with the environment where it is used. txt file, consider adding the PUBLIC keyword to ensure that the transitive dependencies (i. cpp, but only to symB instead (and let symB to refer symA only). 0 w __cxa_finalize U exp U fprintf U fputc U free U fwrite w __gmon_start__ w _ITM_deregisterTMCloneTable w However, in the executable target, we get a variety of linker errors specifying 'undefined reference to' our constructors in the shared library. h". A shared library packs compiled code of functionality that the developer wants to share with other developers. For example: PyObject *l = PyList_New(0); Online help suggest Added in version 3. c file to . 8. 3. 04 i have several shared libraries and here is the abstraction of them: libtest0. @DmitryKochkin Choosing static/shared runtime libraries is a can full of worms (default choice is different between LLVM and GCC, -static-libasan does no really work in GCC, shared/static runtimes work differently depending on whether main app is sanitized or not, etc. Thought I could add it to the CMakeLists. Prefer use target_link_libraries(MY_PROGRAM MY_LIBRARY) - other targets can require different dependencies and it's better not use a global set of when trying to build i get this errors: undefined reference to 'uuid_generate' undefined reference to 'uuid_unparse' this my CMakeLists. Also, modern CMake encourages the use of target_include_directories() instead of include_directories(). As mentioned in the question, I noticed that libvdo_slam. 04. I followed the instructions of building and installing the library which seemed to have gone fine. – I am trying to cross-compile apache-qpid for an arm system from a debian. , target_link_libraries(my_app ${Boost_LIBRARIES} -lrt) That achieves the same effect in solving the missing library to be linked against by using e. Jul 7, 2014 · I am building a project with CMAKE. org/cmake/help/latest/command/add_library. conf (or wherever ld. Prefer use target_link_libraries(MY_PROGRAM MY_LIBRARY) - other targets can require different dependencies and it's better not use a global set of Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company A regular SHARED library is not allowed to use undefined symbols. Everything is fine at compile time. Now I wish to build another shared library that uses A_shared and its own sources. out, the executable which links a Oct 1, 2021 · The problem seems to be you’re building a STATIC library (check https://cmake. cpp Adfeature. LOCAL_LDLIBS way LOCAL_LDLIBS := -llog I am struggling with building a CMake package, which uses one external static library included from another CMake packages. A regular SHARED library is not allowed to use undefined symbols. 7 source files in Cygwin. when trying to build i get this errors: undefined reference to 'uuid_generate' undefined reference to 'uuid_unparse' this my CMakeLists. I prepared a crude diagram for you to visualize my set-up. so or . Without extra linking options on both steps. After reading the pybind documentation, we believe this is because the pybind11_add_module function forces cmake to compile the shared library with a 'hidden' visibility flag. framework". Similarly, you should add the PUBLIC keyword here also: Nov 25, 2020 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Apr 17, 2015 · I already read and searched a lot (e. Subreddit dedicated to all things CMake, the cross platform build system. If you can build with shared libraries, it means that you have this in place (unless you use a . Ask Question Asked 4 years, 8 months ago. The long answer is a bit more complicated. Just use target_link_libraries. The file structure is as follows: ├── app │ ├── libs │ │ ├── bthread │ │ │ ├── CMakeLists. EDIT: The usockets library also contains two . the bar library) can be propagated to the final target. 6) project( Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; im trying to get FLTK working with CLion using CMake (been getting undefined references errors), I've tried all of the formats suggested online and in the readme: " and then "TARGET_LINK_LIBRARIES(exercises fltk)" and my first thought is Finally figured it out. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Force GCC to notify about undefined references in shared libraries. I explained in my previous question that I am trying to build a dynamic library ‘libdpdk. create a test executable for the shared library. ADMIN MOD CMake target_link_libraries() ld: undefined reference or ld: cannot find -l So it turns out # Not what you think! target_link_libraries(<target> PUBLIC <lib> <lib2>) # no PUBLIC. 6) project( Force GCC to notify about undefined references in shared libraries. conf placed, I don't remember it clearly). so>. so’ to my own main. Compiling B, I get a lot of undefined reference to. For full info on the FindBoost module, run: My goal is to use api from static library within source of shared library, by using cmake 3. On Linux a shared library is a file with the . Linking to shared libraries that call other shared libraries. The linker resolves references in order, so when the library is BEFORE the module being compiled, the linker gets confused and does not think that any of the functions in the library are needed. CMake third party library undefined reference. I then link those programs with a library that was built with gcc version 4. To accomplish this we need to add BUILD_SHARED_LIBS to the top-level Summary. so was not listed as a shared library when running $ readelf <on_my_library. c files (which would default cmake to compile with a C compiler. Ask Question Asked 11 years, 6 months ago. txt did not work. When creating a shared object, it will cause the link to fail if there are unresolved symbols. > I want to move over to cmake because it seems simpler and neater. Roughly in order of importance: add_library allows you to define the library as either STATIC or SHARED, but not both. Any object file from a library being investigated is included if it defines, at least, one symbol which is undefined so far. cpp file (using g++ compiler or whatever your environment c++ compiler is). In this case both library and app will use libc++. In the main directory, there is main. Look at this example line in your CMakeLists. The class ibvp is similar to TopLevel class in step 18. Why is my shared library not linking correctly when using CMake? 5. Modified 4 years, 7 months ago. It is defined in src/ibvp. Because these are targets, and not variables, you do not need to use ${} syntax for variable de-referencing. This is misleading. Thanks a lot @xiaocenxiaocen for the small example, that helped a lot. I cloned Specifying ${PROJECT_SOURCE_DIR}/src in target_sources call is not a correct way to collect all source files from src directory. Removes the trailing file name and backslash from a path, if they are present. std::shared_ptr<SineWave> newSineWave = std::make_shared I'm new to CMake and also trying to understand how linking works, or what could cause libtorch and OpenNMTTokenizer. 3. 0 Long Explanation. The goal is to provide the . Once processed, the libraries are otherwise forgotten. so), but on Windows, it seems to be tricky. Anyhow, I will make a general statement about similar linker errors I have encountered in the past: Other than find_library, what CMake tools are available to link to TBB shared libraries? I have tried some CMake tools, but I cannot figure out how to link to TBB *. The _LIBS suffix is typically used on variables that are defined during calls to find_package(), but . This library itself should contain references to all other needed libraries. 3). so extension, which stands for Shared Object. The answer turns out to be quite simple: cmake needs to be told to link with the DL libs, using ${CMAKE_DL_LIBS}. 4 (Ubuntu 4. The functions it should try finding when linking is therefore SSL_get1_peer_certificate and EVP_CIPHER_get_iv_length - Pro tip: this is using the -D${Variiable name} as in this answer causes cmake to cache the value, so you only have to call cmake with these variables once at the command line once in the project. The files that defined these reference functions were in . You should specify them from most-dependent to least. 0. so not work together. In below 3 cases, the lines mentioned should be added in Android. Default stdlib will be used. make And then manually install these into /usr/lib/ This version correctly links in libpthread into libgtest. cpp as well as . This works fine on Linux (of course with . It increases link time, but with so many libraries somewhere might even be With the C API now merged it would be very useful to have build targets for make and cmake that produce shared library versions of llama. Undefined reference with cmake using own libraries. project( main ) . h CMakeCache. txt │ │ │ └── include │ │ ├── cuse │ │ │ ├── CMakeLists. I am new to CMake. so. Viewed 61k times -Wl,--no-undefined linker option can be used when building shared library, undefined symbols will Make sure cmake properly locates libraries during generation stage: Cmake linking to shared library cannot find library. h and require the library libm to be linked. With . So there are two things going on with the -pthread option. cpp) target_link_libraries(my_node dynamic_lib my_dependency) The source of my_node DOES NOT use dynam Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I am trying to setup the HelloJNI tutorial to compile and link a native library to the default library the example creates. Then you should run ldconfig. I know there are a lot of topics undefined reference to '__gcov_init'" and "undefined reference to '__gcov_merge_add' i. 12) project (space_engine) add_library (CelestialBody SHARED CelestialBody. cpp test. This can be useful when creating a dynamic binary and it is known that all the shared libraries that it should be referencing are included on the linker's command line. Story-time 😃. One includes the other. cuda shared library linking: undefined reference to cudaRegisterLinkedBinary. Aug 26, 2018 · Get the attached patch and apply it with "git apply <patch_file>". By putting the library AFTER the module, the references to the library in the module are resolved by the linker. h CMake would normally take care of the correct order of libraries passed to the linker, but I nonetheless recommend using --start-group--end-group linker options for the GNU toolchain. On linux, you can list the symbols defined in a . If you wonder whether it is a good approach to use GLOB in CMake, then see another question. Sort by: Best. if (WIN32) find_library(WINSOCK2 ws2_32) target_link I'm trying to build a shared library in C++ in Ubuntu (which I will load at runtime using dlopen), but I noticed that the shared library builds just fine even if there's some missing dependencies. Following the C++ guide on the wiki of the library I tried to call a function from the library which resulted in a "Undefined reference to function. so library into the Yocto build system in an atomic way, so can be used by other recipes managing application level. Library a compiles just fine, i can easily compile it to a . The kImageAnnotator constructor was private to the library (I just learned that Qt does that when Hello, I am trying to compile a project (based on the FEM library deal ii) with multiple source and header files. Long explanation. undefined reference with shared library using cmake. The fix here also fixes some other problems that arise during the linking step of the shared library creation. g++ -o Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company learn. The duplicate question describes how to correctly do that. Undefined reference in transitive library linking. shm_open is an undefined symbol in shared library. Why is my shared library not linking correctly when using CMake? 13 C++ CMake undefined reference when linking an executable to a third party dependant shared library. g. I am trying to use an external third-party shared library file in my project using the CMake build system, where I have access to just the . h LinkedList. From the build log the original poster showed, this is on Windows? There you have to define symbols to be exported/imported if you use them from a dll (__declspec(dllexport) / __declspec(dllimport). nvcc uses the host C++ compiler to compile host code, and this implies that symbol name mangling is applied to code emitted by the CUDA toolchain. This is the structure of my program: I have two different cmake files: 1- for exec. Instead, use the Cmake approach: cd gtest-1. In this section we will show how the BUILD_SHARED_LIBS variable can be used to control the default behavior of add_library(), and allow control over how libraries without an explicit type (STATIC, SHARED, MODULE or OBJECT) are built. I have been compiling with both of these statements: g++ test. c. C++ Boost Library Undefined Reference On shm_open: DSO Missing From Command Line. These linker import files are also known as text-based stubs, and they have a . Undefined reference to function although linked against library. so: cannot open shared object file: No such file or directory. Link libraries to all targets added later. I am using Cygwin and I have Python2. I am relatively new to Cmake and Linux ( Aug 7, 2018 · The problem here is, that the linker relies on the order of the libraries. So I have: g++ 5. 3 from source on my raspberry pi zero 2 w (without cross compilation) But cmake detected undefined reference to many neon-related functions. Now lets assume that the executable uses only symbol Lib_A1, and Lib_A1 uses symbol Lib_B1 which However when the linking of main. Th I am trying to build qtbase-everywhere-src-6. so I've my project B that include A. This feature instructs the linker to search the specified static libraries repeatedly until no new undefined references are created. hpp" int Structure::sum( int a, int b ) { return a + b; } The following built-in group features are pre-defined by CMake: RESCAN. I am generating two shared libraries. ; Split Plugin into library functionality provided to Tool and plugin functionality provided to Host (implementing the plugin by invoking the library). I've having a tough time to link the final application. cpp:(. undefined reference to `omp_get_wtime' 0. so file, however the issue comes about when i try to link to library a. ). Also, it is not allowed to link with a library, which contains undefined symbols. so gcc shared library "undefined reference" on nested dependencies. With more information regarding the symbols available in the static and dynamic libraries, I've come to the conclusion the shared library is empty. There is undefined reference to __dlopen error, but it seems that it is related to the previous warning: using 'dlopen' in I'm trying to refactor some classes from a large main file into separate header and cpp files and am getting undefined reference errors at link time. add_library(A_obj OBJECT ${A_SRCS}) add_library(A_shared SHARED) target_link_libraries(A_shared PUBLIC A_obj) This process works. text+0x21): undefined reference to `FooClass::SayHello()' collect2: ld returned 1 exit status Library code: fooclass. h) - Win32 apps. With these steps, you should be able to include your library as a Git submodule and successfully build your project Hello, I am trying to compile a project (based on the FEM library deal ii) with multiple source and header files. cpp can warning: cannot find entry symbol _start; not setting start address ld: libllama. cpp) to create your library. It's empty because $* here expand to empty. h and src/ibvp. I created a small simple console project with a "main. g++ then interprets the next parameter -shared as the path of the include directory (linux directory names can start We can link a shared library in Android in 3 ways. Th Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I don't recommend to enable global dynamic lookup:-undefined dynamic_lookup which will mark all undefined symbols as having to be looked up at runtime. Easiest way. txt states the solution. 11). So my library is in: /usr/local/lib/A. cpp files. find_package( OpenCV Mar 9, 2022 · This article explains how to link a shared library to your application, built with the GCC toolchain. target_link_libraries(ros_vdoslam_node ${catkin_LIBRARIES} ${OpenCV_LIBS} I explained in my previous question that I am trying to build a dynamic library ‘libdpdk. a file actually has the symbol that is undefined. There are statements in some answers that it generates different compiled code. CMAKE LINKING ERROR with a user-defined shared library. Modified 4 years, 10 months ago. The first sentence in the manual link_libraries. gcc -shared When I compile my code for a linked list, I get a bunch of undefined reference errors. Hot Network Questions When someone, instead of listening, assumes your views (only to disagree) There are a few issues here, some more critical than others. cpp) target_include_directories (CelestialBody PRIVATE ${CMAKE_CURRENT_LIST_DIR}) target_include_directories (Planet PRIVATE ${CMAKE_CURRENT_LIST_DIR}) I'm compiling C++ programs with gcc version 5. back them up with references or personal experience. I am also generating an executable. To fix that I added #define SDL_MAIN_HANDLED to my main. 1 day ago · Hi everyone, I have a little issue with my Cmake configuration. Asking for help, clarification, or responding to other answers. tl;dr: put the object file first, the libraries last. The behaviour for shared libraries on their own can also be controlled by the --[no-]allow-shlib-undefined option. target_link_libraries links the dependencies in the order they appear in the command. Make sure the . txt. h LinearNode. Cmake linking to shared library cannot find library. Ask Question Asked 4 It doesn't matter if the libraries are built STATIC First, the answer is: Append -lrt to the end of your macro target_link_libraries for your target my_app, i. h" but you did not commit a file named qschematic_export. creating APIs), is that the symbols in the deeper layers are hidden (think of peeling onions) and not used. If you replace ${BOOST_LIBRARIES} with ${Boost_LIBRARIES} in your two target_link_libraries calls and it should work correctly. Since your code is the plain C if you remove #include <iostream>, rename your file main. After hours of debugging of a code that worked just fine in Windows both in Visual Studio and CMake while being a pain in the neck in Linux I found the culprit! undefined reference with shared library using cmake. h?Does CMake generate it somehow? (I use qmake on most things and have minimal CMake fluency. here Dec 31, 2020 · How to link to a custom C++ library using CMake on Windows and avoid "undefined reference" errors - that do not happen on Linux. cmake_minimum_required(VERSION 2. 2. Viewed 61k times -Wl,--no-undefined linker option can be used when building shared library, undefined symbols will CMake variables are case-sensitive, and the FindBoost module sets the boost libraries to a variable named Boost_LIBRARIES, not BOOST_LIBRARIES. The link fails because you are linking the Tool program against the By the looks of it, you are using old versions of ssl. add_executable(my_node main. Needed to add ADD_DEFINITIONS(-DBOOST_LOG_DYN_LINK) to my CMakeLists. don't refer to symA in your main. h etc. Lets assume we have an executable that uses two libraries: Lib_A and Lib_B. Some linkers are single-pass only. – Tsyvarev Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; but I keep getting linker errors for "undefined reference" to multiple libraries. 1 2 3, several docs for CMake, similar projects, etc. I've got a project that looks like this: ├── Linking static libraries in CMake Project - Undefined Reference. Linking shared library that also links a different shared library in The add_library() lines in your CMake define IMPORTED targets for the tidl libraries. The executable is linking to the shared Sep 22, 2020 · However lib1 doesn’t have any issues, while lib2 generates unreferenced related errors when being linked to an executable that uses it. com PathRemoveFileSpecA function (shlwapi. Libraries are inspected to look for any undefined symbols the point they are encountered. Undefined reference to function CMake. Very simple code for static library // Header class Structure { public: int sum( int a, int b ); int mul( int a, int b ) { return a * b; } }; // Source #include "Include/Structure. You can influence this default behavior by setting the BUILD_SHARED_LIBS variable, for example, as an option for your library users. g++ LinearNode. I've fiddled for hours with library order but no joy. 2. ) are declared in math. Build library using clang++ and compile app using clang++. how can I really solve the problem? usr/local/lib/A. c -o my_app -lrt undefined reference with shared library using cmake. libmgl. Change the linking type to PUBLIC so it is used when building the library target itself, too. In the main file, I learn. I then get undefined reference link errors: undefined reference in the already built libsec-common. You have to use it like target_link_libraries(ch4 m) to link libmto your You can add lib folder to /etc/ld. cc . It creates a library. `ld` undefined reference error, but libraries are linked to by CMake and symbols exist. whether its single program or an application involving shared/static libraries etc. Share. Follow edited Dec 25, We are using cmake and in CmakeLists. Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Undefined reference errors occur because executable programs cannot contain unresolved references. I need to figure out how to manage a recipe for a package based on CMake creating a very simple shared library. txt cmake_minimum_required(VERSION 3. so: undefined reference to `cblas_sgemm' OpenBLAS was not linked properly and Static libraries in a linkage sequence were linked on the as-needed basis explained in example 1, but shared libraries were linked unconditionally. microsoft. h and evp. Also I am new to CMake and didn't realize that things are not carried over to CMakeLists. 8. 7. This solved the main issue with the undefined references but there was still one left, which was an undefined reference to WinMain. Or include their files forcing C linkages for their API functions: The issue is that the CMake variable CMAKE_INCLUDE_PATH is empty per default, and therefore adding -I${CMAKE_INCLUDE_PATH} to CMAKE_CXX_FLAGS causes g++ to be called with a flag -I missing a parameter for the directory path. One way to solve this is simply to add the library dependency to the target in the main CMakeLists. cpp" file. If you are using gcc to invoke the linker, you'll use the compiler -Wl option to pass the option to the linker:. it relies on library b which is a static library written in c compiled with -fpic. All other files including header and source files are stored in a subdirectory src. But for clear answer about app's lib folder better to google or ask someone who more familliar with linux programming than me, I'm not sure someone else will see your comment here. For Entitlements to work (e. Getting "undefined reference to" 3. However, I am curious why this is, since I am including the directory and telling CMake to compile this file. For such linkers, circular references between libraries typically result in unresolved symbols. 8) . 4-2ubuntu1~14. so: `extern void foo()`, and not depends on libtest0. Let me try to explain how linking works in CMake. i. As a minimal example, p They seem don't care of C++ and including their header files into . Every build after that will use the cached value, so you don't have to add this to cmake every time (unless you delete your build directory) My recommendation is to start simple, and then complicate your project further. I have a library a which is a shared library written in c++. txt files. Unlike libc, which is automatically linked, libm is a separate library and often requires explicit linkage. Here are the steps that I take, starting with building a shared library A_shared using an object library A_obj. 7. txt Henty Waker wrote: > Hi there > > I have some C code that I cross compiled for a small mobile point-of- > sale device running uClinux on an arm processor. CMake Default Behavior. undefined reference to 'shm_open' 0. You have a problem with symbol name mangling. For greater completeness, following is the content of main. 0 mkdir build cd build cmake -DBUILD_SHARED_LIBS=ON . If I were to build an executable I would get an undefined reference linker error, which is what I would like to see here. so’ of my own functions linked to the 3rd party DPDK libraries. cc file. Open comment sort Hence, when you try building a final shared library that actually uses the pthread capability it fails. Clion / Cmake can't find boost on linux. cpp to main. I’m trying to build zstd to be used in Android with jni with the following CMakeLists. extern "C" { #include Undefined reference to constructor using CMAKE OPEN I know, undefined reference exactly says what is wrong: The linker cannot find a valid reference to the given constructor. Jan 8, 2012 · One more alternative, in the case you are working with the Appstore, need "Entitlements" and as such need to link with an Apple-Framework. The code is below. The third party lib (torch) was built using a Pre-cxx11 ABI, and libs built with that couldn't obviously be linked to the object that was using cxx11 ABI!. 15. cmake CMakeLists. cpp files you need to include in your Many mathematical functions (pow, sqrt, fabs, log etc. I'm making a C++ Shared Library and when I compile a main exe that uses the library the compiler gives me: main. If you wish to duplicate -pthread, you could use -lpthread -D_REENTRANT=1. def file or use CMake’s automated way of creating it). But, I managed to get it fixed by exporting LD_LIBRARY_PATH=/usr/local/lib. Ask Question Asked 14 years, 10 months ago. so" and that library in turn will call a function You should put your compiler details that describe your toolchain in a toolchain file, not directly in the project. Hello, I am trying to compile a project (based on the FEM library deal ii) with multiple source and header files. When trying to link SDL3 as git submodule I get many errors: undefined reference to `SDL_DestroyWindow' undefined reference to `SDL_Quit' undefined reference to `SDL_Init' undefined reference to ` Conclusion. Much more safe way to resolve it for specific symbols:-Wl,-U,symbol_name, which only does so for the given symbol (note: you have to prepend an underscore to the symbol name). Since funccpp_lib depends on funcc_lib, you have to change the order of the libraries: target_link_libraries(prog funccpp_lib Apr 11, 2020 · I'm trying to refactor some classes from a large main file into separate header and cpp files and am getting undefined reference errors at link time. cpp LinkedList. The Makefiles work fine, but they're messy. For that reason CMake explicitly prohibits linking with a MODULE library. > > I currently use plain Makefiles to build a number of static libs that > are linked to a single exe. By ensuring that all dependencies (like libdrm in this case) are linked when building the executable, you can resolve these issues. CMake "injects" the libraries on a "low level" into the commandline, Aug 14, 2019 · In your Shared Libraries CMakeLists. cu to something like this:. So here are the three ways. The former is a package with a CMake config, and the latter is a shared library. . html to know why it’s static). Jun 17, 2024 · The problem is a reference thing. Also, there is no need to append the _LIBS suffix. Build library with -stdlib=c++ and compile app with -lc++. To learn more, see our tips on writing great answers. cpp. I would then link ‘libdpdk. Edit: The auto generated CMakeLists. cpp) add_library (Planet SHARED Planet. Because I did not specify SHARED, CMake automatically created a static library. The whole idea of inter-referencing shared libraries (i. Other contact methods are available here. add_library() command has the word "add" in it, I know, but it doesn't add any library, just like add_executable doesn't add any executable. txt main. I thought it might be some other dependencies, so I tried Dec 2, 2013 · I've compiled a shared library A that use Nite1. . gcc compiler: gcc my_app. so: definition of `void foo()` libtest1. cpp Makefile Added in version 3. cpp file before including "SDL. Provide details and share your research! But avoid . This behaviour is economical at linktime because the linker doesn't have to ponder whether a shared library is needed by the program: if it's a shared library, link it. If they aren't there, here are the possible causes: You aren't using all the C++ source files (. cpp the "undefined reference" errors disappeared. so was built, then no undefined references should be found. Make sure the symbol that is resolving to undefined is in there. tbd file extension. txt so it looks like:. so: undefined reference to `XnVFlowRouter::XnVFlowRouter(char const*)' . cgvmu qwxydue gbgvzslm itmjbz zdgklbn ujwggq vrsb qtviht mfypvu bvnw