static-libraries | 易学教程

Android NDK: how to link multiple 3rd party libraries

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问题 Let's say we're building a shared library A that needs to link to 2 external static libs B and C. All you've got are libB.a and libC.a, along with their header files. Here's a simplified Android.mk for libA: LOCAL_LDLIBS := ../external/libB.a ../external/libC.a include $(BUILD_SHARED_LIBRARY) AFAIK, the way linking works for shared libraries is: grab all object files of B and C strip out object files that A doesn't reference resolve references in B and C This gives link errors because B and C

How to add prebuilt static library in project using CMake?

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Clion: how add or (use) prebuilt static library in my Project? You're probably asking about how to link your project to the pre-built static library. If so, you can do like this by calling target_link_libraries . Assume your project called myProj and the pre-built library myLib.lib , you can do like this: target_link_libraries(myProj myLib) I had great difficulty making this work as I was completely new to CLion and CMake. In my scenario I was taking a class that required us to use the course library in every project. Assuming you have a library called libClassLibrary.a , do the following in

gcc - A static library with undefined symbols?

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问题 I'm trying to build a project using a static library, so that the binary can be used even if the library isn't installed. However, I get lots of errors about undefined symbols when I try to do so. Looking at the library, I see it has tons of undefined symbols, even though it's a .a static lib: nm - u /usr/local/lib/libthis.a .... U EVP_DigestFinal_ex U EVP_DigestInit_ex U EVP_DigestUpdate U EVP_MD_CTX_cleanup U EVP_MD_CTX_init Those seem to be from openssl; others seem to be from libbzip2;

FFMPEG for Android toolchains: arm-linux-armeabi-eabi-pkg-config - is there any toolchain in existence containing the pkg-config tool

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问题 Does anybody know any toolchain for ffmpeg linux arm platform which contains the arm-linux-androideabi-pkg-config tool? The Android NDK does not contain it. Also has anybody succeeded in building ffmpeg for android that contains the alsa device? Please note that libasound is present on my Ubuntu x86 PC. After very extensive research visiting forums including ffmpeg.org, ffmpeg--nabbles, groups.google.com including the andro and android-ndk gropus, and the Internet in general, I have not

How to import static library in python? [duplicate]

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This question already has an answer here: ctypes for static libraries? 2 answers I have a static library(liba.a) and i want to use it in python but import can only import dynamic library in python how to import static library in python?? You can't do this. You have two options: Recompile the library as a shared library . Then use ctypes to call methods from the dynamically-loaded shared library. Build a Python Extension exposing a Python interface to the shared library. 来源： https://stackoverflow.com/questions/19560594/how-to-import-static-library-in-python

How do static libraries do linking to dependencies?

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问题 Say I have libA. It depends on for example libSomething for the simple fact that a non inline method of libA makes a call to a method in libSomething.h. How does the dependency link up in this case? Does libA have to statically link to libSomething when it is compiled, or will a user of libA (an application using libA) need to link to both libA and libSomething? Thanks 回答1: Static linking is just copying the whole items (functions, constants, etc) into the resulting executable. If a static

Xcode6 Creating Fat Static Library iOS Universal Framework

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Since the upgrade to Xcode and iOS8, I've been having trouble building a fat static library. There are some pretty good instructions here and here but I think parts of the first instructions and all of the second instructions are dated. The first instructions say to use Static iOS Framework and the second instructions say to use Cocoa Touch Static Library . Prior to Xcode6, I would use the Static iOS Framework but now that they have renamed it to Cocoa Touch Framework I'm not sure. So, for starters, which should I use to create a fat static library ? Is it Cocoa Touch Framework ? Or Cocoa

Mixing static libraries and shared libraries

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I have a project where I have one static library libhelper.a and another with my actual shared object library, libtestlib.so . My goal is to link libhelper.a into libtestlib.so . Is that possible on Linux/BSD? When I tried and created a test program I got the following errors: ./prog1:/usr/local/lib/libtestlib.so.1.0: undefined symbol '' My guess is that this is occurring because libhelper.a was not compiled with -fPIC while libtestlib.so was. What is the proper way to build programs that use shared libraries that also have dependancies on static libraries? Thanks! My goal is to link libhelper

Is a static variable in a library (DLL) shared by all processes referencing that library?

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问题 I know that a static variable used in a web application is shared for all users across the web application. If I have a library (DLL) that uses some static private variable, do all applications using that library share the value of that variable? For example, say I have the following code in my DLL: private static bool isConnected = false; public static void Connect() { // TODO: Connect. isConnected = true; } public static void Disconnect() { // TODO: Disconnect. isConnected = false; } Then

It gives errors when using Swift Static library with Objective-C project

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I need to make swift static library for my requirement. I made swift static library which uses swift and Obj-c code. I have included Obj-c files via bridge file. I am able to compile swift static library without any error and get libMySwift.a file. I use Xcode9.3 with Swift4 to compile library. I include libMySwift.a in obj-c project and also included obj-c compatible header to access my lib in the project. When I try to compile the project it give below warning and more than 200 errors. Auto-Linking library not found for -lswiftSwiftOnoneSupport Auto-Linking library not found for -lswiftCore