Shared library depends on another shared library txt) lib2: source files (. {dylib,so}, which in turn depends on the system Lean installation at ~/. By using shared libraries, programs can reduce size and reuse common code. a. And, by the way, instead of a build target, it would be better to use directly the file name of the product: test: libmytest. From Library A I would like to call some functions/methods that are defined in Library B. 0 Ubuntu 16. y and x. Static or dynamic is orthogonal to how CMake is set up, it more depends on your requirements. 8. txt) Once this has been said, lib1 and lib2 are meant to be built as static libraries and depends on "rt" and "pthread" shared libs for example Mar 10, 2025 · When you link a static library into an executable or another library, the linker extracts the required object files and includes them directly in the final binary. 1. shared library is able to call other shared library Linking text relocation: Purpose call a function from another object file/shared libary: In the . How to get the dependencies. But if building or using a shared library (libstdc++. lake/build/lib/libPlaceholder. Late binding When a shared library refers to some function, the real address of that function is not known until load time Resolving this address is called binding But really how can we build this? Jul 10, 2018 · So far I tried using -Wl,--as-needed, -Wl,--unresolved-symbols=ignore-in-shared-libs, and opening the shared object with dlopen to get the function I want with dlsym. Aug 27, 2015 · What I want is no matter how different shared libraries depend on each other, I can always create one shared library for each folder. c with the following content. If building A and B as shared libraries, you can get the proper resolution to a dependent library, C, to which are dependencies of A and B, but at different versions. NET Core services are injecting a shared library to the DI container, but that shared library depends on another shared library being available in DI. so) on different version of Ubuntu? Ask Question Asked 3 years, 4 months ago Modified 3 years, 4 months ago Jul 16, 2021 · For example, a program that features compressing files might require the bz2 (bzip2) library libbz2. Feb 20, 2019 · 3 Say a shared library A depends on another shared library B. 9 Inter-library dependencies ¶ By definition, every shared library system provides a way for executables to depend on libraries, so that symbol resolution is deferred until runtime. How to Find a Program’s Shared Libraries in Linux Before determining the shared libraries associated with your targeted program, you first need to know where the executable associated with your program is residing. Nov 28, 2020 · Question: I would like to know which shared libraries are loaded at run-time when I invoke a particular executable. Shared libraries are crucial components in Unix-like operating systems as they provide functionalities to various applications without requiring each app to include and compile the same code repeatedly. lib which links to static. Cyclic dependencies are allowed only among static libraries. With dynamic (shared) libraries, objects within the library are not linked into the program's executable file, but rather the linker notes in the executable that the program depends on the library. txt to identify it better) lib1: source files (. txt (CMakeLists1. so (or in Windows . a However when I do that, none of my own symbols are exported (as reported using nm -gCD libmylib. z but, as far as I'm aware, no package manager will allow me to install both x. Jan 13, 2022 · Why shared libraries are important Shared libraries are the key solution for code duplication between microservices. When the program is executed, the system loads the dynamic libraries that the program requires. The programmer specifies the list of symbols to be exported when the shared library is created. One of the most common examples of the need for shared libraries is logging. Using shared libraries ¶ Python projects may build shared libraries as part of their project, or link with shared libraries from a dependency. For new users of Linux-based systems, the whole handling of libraries can be a mystery. Nov 22, 2023 · A solution I could think of, would be to build part of grpc (the executables) with static protobuf library, while the other part (the libraries) should depend on the shared protobuf library. This option also implies --unresolved-symbols=report-all. What I want to do is: Jun 26, 2019 · If a static library depends on another library, but the other library again depends on the former library, there is a cycle. The term library is more often used in Linux circles and is the preferred lingo among professionals, although shared object (and shared library) are both technically correct. May 31, 2019 · I have a shared library libmain. Is it right? Could you explain the details? May 1, 2019 · The most common decision is to build as a shared library (BUILD_SHARED_LIBS set to TRUE in the CMake script). Create another file application. Can a static library depend on another static library?(Static Lib is made by linking another static lib) If yes, is it possible that after linking to lib2, the generated lib(l Makes a top-level <target> depend on other top-level targets to ensure that they build before <target> does. I would like them all to be included in the output . so: mytestlib. It's been a little while. Is there any way that I can force LibB to always link against the shared version of LibA? In modern software development using Shared Libraries in C, modularity and reusability are critical to managing large codebases. But how? I am wrapping a shared library (written in C) with Java using JNA. $(AMAJOR) -o libA. Jul 23, 2025 · The command generates a shared library liblibrary. May 27, 2025 · Dependencies If your shared library depends on other libraries, those dependencies must be available in the system's library search path. 0. Using libraries Shared Libraries marked Load implicitly allows Pipelines to immediately use classes or global variables defined by any such libraries. When running ldd it looks something like this: Sep 19, 2023 · How to link with a shared library installed in a custom directory by another yocto bitbake recipe Asked 2 years, 1 month ago Modified 2 years, 1 month ago Viewed 2k times 8. so? Can it run normally in the same directory? barry-scott (Barry Scott) December 18, 2023, 8:46am 4 KADGang: Library headers and why they are necessary Why this example works without the ". Feb 24, 2010 · If this is a shared library that you are building you should add -llibname to the linking command (the one that is something like gcc -shared -o libwav. Jun 27, 2023 · A static library is really nothing more than an archive of object files. Aug 7, 2009 · Now assume that I have another shared lib, say shared2. lib in this case? Sep 10, 2013 · I want to create a shared library libdependent that uses certain exported functions from libparent using header files. Jul 10, 2018 · So far I tried using -Wl,--as-needed, -Wl,--unresolved-symbols=ignore-in-shared-libs, and opening the shared object with dlopen to get the function I want with dlsym. Static libraries are . If library A needs library B to work, then that's poor coupling. While static libraries serve these needs during compile time, shared libraries offer dynamic flexibility at runtime. g. Which is a useful feature when you build an Android project. so on Unix-like systems, . Specifying library search paths in an object So far, we have two methods of informing the dynamic linker (DL) of location of a shared library: Finding Dynamic or Shared Libraries If the only library built is the static library (libstdc++. Nov 5, 2025 · This means that a library in the transitive closure of your deps is reachable without going through one of the cc_shared_library dependencies but is already linked into a different cc_shared_library in dynamic_deps and is not exported. A program compiled on one version of Linux may not work on another if the required libraries are missing or incompatible. The use of shared libraries reduces the program size and eases the development and distribution of the program. Aug 27, 2019 · This however proves so far more difficult than initially anticipated. txt (CMakeLists3. Let us say libabc. so in my application. Programs, when they internally list the shared libraries they need, should only list the soname they need. so a. 55 I link with two different shared libraries. 0 to do so. Project B is an executable that has a dependency on project A, and therefore req Aug 14, 2019 · I have a c++ project that utilizes shared libraries, some of which have dependencies of their own. so, loaded by the host program with dlopen ("libmain. if somebody downloaded a "Helloworld. Understanding how to manage these dependencies is critical to ensure your application operates smoothly. But with experience, the massive amount of shared code built into the operating system can be an advantage when writing new applications. 04 i have several shared libraries and here is the abstraction of them: libtest0. It uses another . Good, now let us run it: $ . The open source dependencies could be also shared libraries, or static libraries. As developers, we compile our source code with the shared libraries that the code depends on to produce an executable file. Jan 26, 2024 · The plugins are configured to be used with QPluginLoader. code section it calls an arbitrary address ie call 0x00000 at line 0x1000 Aug 2, 2018 · Just tell make that your library depends on its sources: libmytest. The new package must use the shared library from old package to build it. so libB. so, so you only need libX. Whereas for a variable which is known to reside in the same shared library, it is just a direct memory access: one memory load instruction. h") Whilst Sep 20, 2019 · How do library files (*. The plugin-libraries depend on other shared libraries themselves, which are also located in some local path or in the same path as the plugin library. Doing so means that a shared library is being created but that all of the library's external references must be resolved by pulling in entries from static libraries. so when you load (run) myProgram, the dynamic loader will follow the unsatisfied dependencies and look for the symbols in both Dec 18, 2023 · So according to what you mean, assuming that the Python extension library I built is pyex. Also, you've described the use of multiple libraries to build an app; it's the app then which depends on the libraries, and not the case of libraries depending on other Creating a shared library When creating a shared library that you would like to link against, then you need to ensure that the symbols that are going to be used outside the library are properly exported when the library is created. dll on Windows) is a shared library that is loaded at runtime. Apr 12, 2023 · Each ELF shared object (“native library”) must have a SONAME (Shared Object Name) attribute. By definition, every shared library system provides a way for executables to depend on libraries, so that symbol resolution is deferred until runtime. I am writing a shared library (lshared. Feb 20, 2025 · I have a situation where some ASP. When you link with a static library, it becomes an integral part of your executable or shared library. So, if you specify a as a dependency of b in this way, you don't even need to explicitly list a in any target which depends on b, i. e. 3, and another program on your system depends on a quirk of libfoobar-1. so): There is only one form of this library but it can be used in two ways. Dynamically linked shared object libraries (. If one program on your system depends on a quirk of libfoobar-1. Library B depends on Library A. However, if we use cc_import to import libcurl and use a dependency, we can make linkstatic work as intended. I have a parent C++ Makefile that builds 2 libraries, from two source subdirectories. For developers and system administrators, understanding these dependencies is vital for debugging Sep 17, 2019 · 0 Is there a tool like ldd which shows which libraries an executable depends on,but for inter-library dependencies. c) CMakeLists. Subsequently imported when you are linking against the library. so) resolve shared dependencies? Ask Question Asked 6 years, 2 months ago Modified 6 years, 2 months ago Aug 7, 2014 · I am using CMake to build different C++ libraries, the whole thing can be summed up like this : lib a : depends on nothing lib b : depends on a I now need to create a lib c that depends on b. ) ^ | depends on | depends on | Qt Jul 18, 2024 · Hi! lets say I want to make a game, my game uses a library, which depends on another library. so and then gcc -o myProgram a. so", RTLD_LOCAL), and under some conditions, libmain. This requires communication between multiple teams. If you really want an alias for this, you can add a phony target: . o b. Find the tools for various systems (and basic usage for some of them) listed below. so, also with Jan 8, 2015 · a shared library, you don’t need to specify dependencies towards other shared libraries this shared library depends on, but you may need to specify the path to these libraries on the link command using the -rpath / -rpath-link options. Nov 16, 2024 · In C programming, shared libraries are a means of allowing multiple programs to share the same code; this leads to more efficient use of memory and easier management of updates and dependencies May 3, 2023 · This is the continuation of Packaging a C extension with a dependency on another C extension As explained in that thread, I’m trying to produce wheels for python-poppler-qt5, which is in this situation: tons of stuff (libfreetype, libjpeg, libpcre2, libtiff, etc. Nov 29, 2017 · I'd like to know which libraries are used by executables on my system. The main trick is to figure out how to reference the system-provided The tools used to detect the libraries an executable or another shared library depends on are highly platform-dependent. dll on Windows). exe" that I had compiled on my computer using a shared library (that wasn't part of a standard operating system), would they also need that shared library on their computer for the program to run without errors? Jul 4, 2010 · What I want to do is to create a new shared library called libxxx that links against another shared library called libzzz, this shared library has an independent "pkg-config"-like tool, let's say it's called "zzz-config" which gives the cflags needed by the compilation phase when using the libzzz. The library is currently written in C. Jul 24, 2023 · Shared libraries become active once a program is launched and will reside in memory during the program’s runtime duration. A program would typically depend on other libraries to function. How can I do this? Jul 28, 2019 · How can a shared library that is loaded at runtime from my main program use classes from another shared library that is also loaded at runtime? I've modularized my game engine architecture. I have two C++/CLR shared libraries where one depends on the other. Mar 11, 2025 · One User at a Time: Only one person can play a shared game at a time. Any other libraries referenced by the original shared library in this way should automatically be loaded as well. Specifically, one of the shared libraries I'd like to install, libtorch. I had some headache using ExternalProject_Add to build and link a shared library from another project. In this article, we will discuss how to create a shared library or package in the . a are included in libX. More specifically, I'd like to rank which libraries are used the most, along with the binaries that use them. so: `extern void foo()`, and not depends on libtest0. The source code of old library must centralized in one place and all package (project) just use it if needed. so to resolve symbols used by libA. z. The dynamic section of the executable requires a NEEDED entry for each shared library that the executable depends on. I usually use cmake which handles dependencies at a slightly higher level A program would typically depend on other libraries to function. Of course, there are solutions ready for C&P on StackOverflow (e. But all of these methods fail at one point or another. How to build the library depends a bit on how the developer set up its build environment. Dependencies added to an imported target or an interface library are followed transitively in its place since the target 10 I have two separate libraries (Library A and Library B), I have defined them on the jenkins configuration so they can be both called from the pipeline. There are traditionally three ways to specify the exported symbols of a shared library. Does the linker automatically link shared2. Is there any way to identify shared library dependencies of a program executable or a running process on Linux? Feb 21, 2014 · I am writing an android app that wants to make JNI calls into a shared library built in using the NDK. The real work is just getting the dependencies worked out in the makefile. so will load another shared library, libpatch. Here’s an example: Imagine the following scenario: Project A is a shared library which has several dependencies (LibA, LibB, and LibC). c we are invoking the function signum which was defined in a shared library. a, you need libY. A top-level target is one created by one of the add_executable(), add_library(), or add_custom_target() commands (but not targets generated by CMake like install). Unfortunately that means global data in your library will clash with global data from the process your library is running with g++ 5. c" files including headers (hint: default function signatures) Where headers should be installed, how they should be included How to build a shared library that depends on another shared library and how the library and header dependencies should be done (hint: differences between <mylib/blah. The shared library is written internally, but that library uses functions from another external library, which again depends another I am building a static library in CMake, which is dependent on many other static libraries. a): Library of object code which is linked with, and becomes part of the application. NET Core Application. Conversely, when you create a shared library, you only create the library with a specific filename (with more detailed version information). Mar 6, 2021 · Personal website and blog of Alex Reinking. Just starting out and have a question? If it is not in the man pages or the how-to's this is the place! Each <item> may be: A library target name: The generated link line will have the full path to the linkable library file associated with the target. I believe that I could use extern and #[repr(C)] to cater for any software that depends on this library, and from some early tests that seems to work well. For C++ developers on Can a shared library depend on another shared library? In these systems, programs may depend on shared libraries, but shared libraries may not depend on other shared libraries. a file, so I can just ship a big lib file to customers. Because it is a single file to be built, use of link commands are simpler than shared library link commands, because you specify the name of the static library. The linker step is Jul 1, 2016 · When use 3rd party native library in Anroid NDK module, build them separately and use as prebuilt shared/static library. Aug 27, 2012 · line: it affects library searching for -l options which follow it. Dynamic library A dynamic library (e. When we start a program, the Linux program loader checks if the program depends on shared libraries and tries to find them. Since, now a team making a change has to ensure that it does not break another service that depends on the shared library. dylib) files. For example one shared library needs another one. x), how can I have a buildable library that is dependent upon another shared library? Scenario: I have two libraries: React App 'a1' React lib 'r1': buildable, publishable JS lib 'ts1' When this target is linked into another target then the libraries linked to this target will appear on the link line for the other target too. I've created a Core module that contains classes such as a custom String library. We have our shared object file (shared library name in Linux) ready to use. so) As soon as I remove the link, I see my symbols appear in the output. I've built lua as a static lib, and am trying to link it to my shared library like so: -L'dir to lib' -lmylib. If two programs that use the same dynamic library execute at the same time, the operating system Jan 8, 2015 · Dependencies between shared libraries aren't resolved until load time, so you can link with the following line: gcc -shared -Wl,-soname,libA. The NDK toolchain adds this attribute by default, so its absence indicates either a misconfigured alternative toolchain or a misconfiguration in your build system. Typically, shared libraries are stored in the /lib or /usr/lib directories. etc. An inter-library dependency is where a library depends on other libraries. To help you get in touch with this topic, I prepared a small application example Jan 13, 2022 · Why shared libraries are important Shared libraries are the key solution for code duplication between microservices. so, and the runtime shared library it depends on is pyshare. $(BMAJOR) -o libB. May 16, 2023 · Note: While you can link a "static" library into a "shared" one (DLL file), merging multiple "shared" libraries (DLL files) into one is not (easily) possible. Somet May 1, 2021 · I don't think that being able to replace a library at runtime is a useful enough feature to justify the high maintenance cost of shared libraries. Again, we can inspect these fields with the readelf program. EDIT As Dec 12, 2022 · CMake Error: The inter-target dependency graph contains the following strongly connected component (cycle): "libA" of type SHARED_LIBRARY depends on "libB" (weak) "libB" of type SHARED_LIBRARY depends on "libA" (weak) At least one of these targets is not a STATIC_LIBRARY. so at runtime. The named target must be created by add_library() within the project or as an IMPORTED library. so uses some symbols form an already built third-party shared library libold. h . Jan 17, 2014 · Ie. If you're running an older application that needs a specific older version of a shared library, or if you're developing a new shared library or version of a shared library, you might want to override the default search paths used by the loader. Jan 8, 2015 · a shared library, you don’t need to specify dependencies towards other shared libraries this shared library depends on, but you may need to specify the path to these libraries on the link command using the -rpath / -rpath-link options. Do them in order so the lib is first, create a lib with add_library and then for the client and server use target_link_libraries to link it in. When you link with a static library, its like linking with the individual object files. In the file application. I have set the VS_DOTNET_REFERENCE to point to the DLL as follows set_target_properties(clr1 PROPERTIES COMMON_LANGUAGE_RUNTIME "" VS_DOTNET_REFERENCES "System" VS_DOTNET_REFERENCE_clr2 "${CMAKE_CURRENT_BINARY_DIR}/clr2. In this case, when I build A, do I need only the header file of B? Because B is only needed when I build some program that needs A. This smells Mar 15, 2002 · Solaris shared library that depends on another shared library 843829 Mar 15 2002 — edited Mar 15 2002 Mar 9, 2022 · Build and install manually from the library’s source code If your distribution’s package manager does not offer the library of your interest, or not the version you want, you can manually build and install the shared library. Sep 4, 2017 · . so), then additional location information will need to be provided. Like I complain about in a comment below, the cost of shared libraries is that an upgrade is all-or-nothing. so file , say lib123. so: definition of `void foo()` libtest1. This tends to be a common source of issues, hence this page aims to explain how to include shared libraries in wheels, any limitations and gotchas, and how support is implemented in meson-python under the hood. You'll get an error at runtime though (loader won't know that it needs to load libssl and you'll get undefined symbol for SSL_new). `ctypes` also allows you to load libraries dynamically at runtime using the `cdll` function. Account Security Remains Paramount: Sharing involves authorizing another account on your computer, so ensure you trust the individual implicitly. I am working in QT . dll, or in OS X . The cpp files is compiled via the standard implicit rule. txt (CMakeLists2. You can resolve this by enclosing the cyclically dependent libraries by -( and -), such as -( -la -lb -) (you may need to escape the parens, such as -\( and -\)). Do Jul 6, 2023 · In C++, variables defined as static within a shared library are not directly accessible outside of the library. The trick is this shared library calls functions provided by OTHER shared libraries. Jun 15, 2015 · There are often instances where a certain program will depend on library version x. y and another on x. Now I am using my shared lib libabc. These libraries could either be compiled into the program itself or loaded from a shared library pool. If the owner decides to play, the shared user receives a few minutes to save their progress before being kicked out. so in the same directory as pyex. The path of libparent is not known on the build stage, so I can't use rpath, AFAIK, CMake does not offer any (convenient) way to combine several static libraries into one (static or shared) library and doing so in a portable (generator, platform) way seems to be non-trivial. so (a lib in /usr/local/lib). so) that is statically linked to another library (l Nov 25, 2015 · 2 I want to add new package to yocto that is depend on other package (composed by library so file and binary) that I get it from git. so in the current working directory. Sep 22, 2021 · This works fine, but it does not properly integrate with cc_binary ’s linkstatic attribute which is intended to allow a binary to choose whether to link against either the shared or static version of a library. I’ve also tried making an intermediate file (that is not a shared library) to depend on Apr 6, 2012 · 927 Shared libraries are . Watch out for plugins, that might pull in further Linux Library Types: There are two Linux C/C++ library types which can be created: Static libraries (. Shared Libraries: Shared libraries are . My question is: Are you forced to resolve every undefined symbol of a dynamic library when linking it against an executable ? I think the idea is that each library is standalone. Jan 12, 2022 · I just wanted to understand how shared libraries with statically linked libraries are expected to perform. Be aware that the tools not necessarily show you all the libraries you need! It's best to separately check the dependency libraries too. Sep 16, 2016 · Shared Libraries are loaded by the executable (or other shared library) at runtime. Jul 23, 2025 · For example, you have built an application that depends on libstdc++. I am trying to build a shared library. MODULE (for internal use by CMake itself) OBJECT Creates an object library (a collection of object files) add_dependencies (part_2 some_library) but that also doesn’t ensure that part_2 is built after some_library (presumably because some_library is a shared library, so CMake thinks part_2 and some_library can still be built in parallel). The buildsystem will have a dependency to re-link <target> if the library file changes. All the code relating to the library is in this file, and it is referenced by programs using it at run-time. ldd prints the shared libraries required by each program or shared library specified on the command line. lib but does not link to shared. a), or if specifying static linking, this section is can be skipped. Nov 22, 2016 · By default ld does not require to resolve missing symbols in shared library so it won't emit an error if you remove -lssl. elan/toolchains/… Step 9: Selecting Static or Shared Libraries ¶ 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. lib) files. Link order is very important, you'll want to link "libcommom" last. This is especially useful if you don’t know where your library will be located until after your program has started running. [1][2][3] 1 day ago · Dynamic Shared Libraries (DSOs) are a cornerstone of software development, enabling code reuse, efficient memory usage, and seamless updates across applications. Shared library A shared library is a library that contains executable code designed to be used by multiple computer programs or other libraries at runtime, with only one copy of that code in memory, shared by all programs using the code. Unlike static libraries (which are linked at compile time and increase executable size), dynamic libraries are loaded at runtime, allowing multiple applications to share a single copy of the library in memory. lib/. txt) executable: source files (. so. In this guide, you’ll learn: What is a Shared Library? How Shared Libraries differ from Static Libraries Why use Shared Libraries? How to Create and Sep 29, 2021 · Mainfolder/: CMakeLists. so Apr 27, 2012 · I found this question in my searching for answers and as @Component-10 suggested, I have created a minimal set of files to investigate this behavior and tested with MacOS + CLANG. 4. so which is a shared object (dynamic library). This section deals only with public shared libraries: shared libraries that are placed in directories searched by Mar 18, 2024 · Learn how to convert several static libraries together with object files to a single shared library. Feb 9, 2022 · In Nx (v13. To access other shared libraries, the Jenkinsfile needs to use the @Library annotation, specifying the library’s name: Apr 16, 2020 · 6 I have a project with a core library (LibA in the example below), an executable, and a second library (LibB) that depends on the first library. To me, this is kind of surprising, since it seems like a very common thing one might want to do. I can't make each library use its own implementation over the other. /test This is a shared library test Hello, I am a shared library That about wraps it up. o libA. I would like to build an executable binary file that should be only linked against libnew. ctypes. The second library (LibB) is always built in shared (dynamic library) form. . This is especially important for packages whose shared libraries are vitally important, such as the C library (currently libc6). txt (CMakeLists4. A program using a shared library only makes reference to the code that it uses in the shared library. Say my-app Jun 25, 2024 · We will build the rectangle library as a shared library that depends on the shape static library or the shape shared library, a static library that depends on the shape shared library or the shape static library. The reason for that is each time a folder is modified, only its corresponding shared library is updated. Platform-specific names Library file extensions and naming conventions vary across operating systems. Thus people quickly came up with the idea of a shared library which, as the name suggests, is shared by multiple executables. PHONY: build and build: test. This option can be used with -shared. So If you want to use library A with library B then so be it, but they should also just work on their own. We distinguish between internal shared That’s it! You just loaded your shared library like a boss. 3 This is probably a dup of how-to-know-if-one-shared-library-depends-on-another-shared-library-or-not TLDR is that you should put linked libs after object/source files. Shared libraries Packages containing shared libraries must be constructed with a little care to make sure that the shared library is always available. My shared library libnew. May 27, 2025 · SHARED Creates a shared library (e. So, it seems like linking a static lib to a shared one is prohibited or undefined behaviour? Is there another Jul 28, 2025 · One can build multiple executables without the need to recompile the file. , [1]), but I'm kind of wondering Can a shared library depends on another shared library? a shared library, you don’t need to specify dependencies towards other shared libraries this shared library depends on, but you may need to specify the path to these libraries on the link command using the -rpath / -rpath-link options. Jul 14, 2022 · How to link to different version of a shared object (. , . Both libraries define some symbols that share a name but have different implementations. Dynamically linked at run time. If building A and B as static, it fails. so gcc -shared -Wl,-soname,libB. How does the application become aware of required shared libraries? Jun 15, 2021 · This worked like a charm for me – the only caveat was subsequent target_link_libraries() calls that depend on your library can’t use the “object library” to link against; those must target the new shared or static libraries (and might be duplicated). Don’t include library compilation into NDK module build. One top level CMake file for the whole project, and then add_subdirectory calls to add each of the subprojects. cpp. lib. a (or in Windows . h> and "blah. For example, both libraries define a global function bar() that each calls internally. Nov 17, 2011 · There are many factors that affect how dynamic loader searches for shared libraries: ld. dll" ) However if I try to add a dependency (either add_dependency or target_link_libraries) so that clr2 is Dynamic Library X depends on Static Library Y: The symbols from libY. LibraryLoader helps abstract some of this, but you might still need to adjust paths. bin Assuming everything compiled fine, I can’T actually move this anywhere. but from memory static libraries are ok to have missing dependencies (since there's no linking yet), as long as you supply all the libraries when building the executable. so depends on another shared library distributed along it libgomp-753e6e92. That makes them a little more complicated in that there’s a whole new field of possible hurdles which we will discuss in this post. Static Library A depends on Dynamic Library Y: When linking an executable or another dynamic library that uses libA. lib to shared. so, then do I only need to install pyshare. Because the path that Lib B looks for Lib A is static on my system (you can check this with strace). Mar 18, 2024 · This is mostly because they lack the features of the other two types. o) for each library that the library's code uses. How can i compile Nov 19, 2009 · If the shared libraries themselves depend on code from another library, order is going to matter. My question is: Are you forced to resolve every undefined symbol of a dynamic library when linking it against an executable ? Aug 20, 2012 · Linux - Newbie This Linux forum is for members that are new to Linux. so on Linux or . Aug 28, 2025 · The Lean part builds a dynamic library at . If you link a "shared" library against another "shared" library, then both "shared" libraries will still be required at runtime! I'm considering rewriting an in-house system-wide shared library in Rust (as a little language evaluation foray). conf, LD_LIBRARY_PATH, whether the executable is suid or not, how glibc was configured, which -rpath settings were given at link time, etc. your other command can be just: Feb 27, 2023 · shared library: map shared library to its own address space and perform function call into the shared library. However, I am being forced to include the header files for the shared library dependencies within Jun 17, 2020 · Linux, in a way, is a series of static and dynamic libraries that depend on each other. Jan 30, 2022 · Shared libraries make Microservices tightly coupled and introduce hard dependencies. In Linux, shared libraries are stored in /lib* or /usr/lib* . Loading shared libraries in Java is a common requirement when interfacing with native code, especially when those libraries have dependencies. We have covered how to build a shared library, how to link with it, and how to resolve the most common loader issues with shared libraries - as well as the positives and negatives of different approaches. Sep 3, 2020 · Why the dynamic linker couldn't resolve reference when a shared library has a dependency on other share library? Ask Question Asked 5 years, 2 months ago Modified 4 years, 11 months ago Dec 17, 2024 · The ldd command in Linux is used to display the shared library dependencies of a given binary. o c. net core - PInvoke C shared library function which depends on another shared library Asked 8 years, 2 months ago Modified 8 years, 2 months ago Viewed 2k times The key to managing shared libraries is the separation of these names. I want to ship all of this in one block like this: game | - Lib A | - Lib B (depends on LibA) | - Game. Each executable contains a reference essentially saying "I need library foo".