Mac C++ Dynamic Library Example

admin 09.04.2020

This is the second post in a series on memory segmentation. It covers working with static and dynamic libraries in Linux and OSX. Make sure to check out the first on object files and symbols. Let’s say we wanted to reuse some of the code from our previous project in our next one.
The following example shows how to set up a library for usage with QLibrary. For the function names to be resolvable, they must be exported as C functions (i.e., without name mangling) from the library. This means that the functions must be wrapped in an extern 'C' block if the library is compiled with a C compiler.

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Loadlibrary(libname,hfile) loads functions from C shared library libname defined in header file hfile into MATLAB ®.The loadlibrary function only supports calling functions that are callable from C and header files that can be parsed by a C compiler. Functions written in C must be declared as extern 'C'. After you get the name of a library by using vcpkg search, you use vcpkg install to download the library and compile it. Vcpkg uses the library's portfile in the ports directory. If no triplet is specified, vcpkg will install and compile for the default triplet for the target platform: x86-windows, x64-linux.cmake, or x64-osx.cmake.

About

makelib is a generic cross-platform makefile for building C/C++/Objective-C libraries.
Its purpose is to ease the build process of libraries for cross-platform projects.

Available targets by system

Building on OSX, the following files will be produced:

Static library (.a): i386x86_64armv7armv7sarm64
Dynamic library (.dylib): i386x86_64
Mac framework (.framework): i386x86_64

On Linux:

Static library (.a): host architecture
Dynamic library (.so): host architecture

Note that on OS X builds, ARM libraries are obviously targeted for iOS.

Configuration

Recommended project structure

You may use makelib as a submodule of your project.

You'll need a build directory with a specific structure, a directory with sources, a directory with includes and finally a Makefile with configuration options.

Here's an example project structure:

Configuration Makefile

A makefile containing configuration values for makelib is required.
Assuming the previous project structure and a C++ project, this makefile may look like:

Please read the section below for details about each configuration value.

Configuration values

PRODUCT
The name of your product/project.

PRODUCT_LIB
The name for the generated static library.
Note: always use a lib prefix.

PRODUCT_DYLIB
The name for the generated dynamic library.
Note: always use a lib prefix.

PRODUCT_FRAMEWORK
The name for the generated Mac framework package.

PREFIX_DYLIB
The directory in which the dynamic library is intended to be installed.

PREFIX_FRAMEWORK
The directory in which the Mac framework is intended to be installed.

DIR_INC
The directory with include files.

DIR_SRC
The directory with source files.

DIR_RES
The directory with resource files, link Info.plist.

DIR_TESTS
The directory with unit test files, if any.

EXT_C
The file extension for your C source files (typically .c).

EXT_CPP
The file extension for your C++ source files (typically .cpp).

EXT_M
The file extension for your Objective-C source files (typically .m).

EXT_MM
The file extension for your Objective-C++ source files (typically .mm).

EXT_H
The file extension for your header files (.h, .hpp, etc).

FILES
The project files to compile.
Note that you can use the GET_C_FILES function for convenience:

FILES_TESTS
The unit test files to compile.Note that you can use the GET_C_FILES function for convenience:

CC
The compiler to use (clang, gcc, g++, etc).

LIBS
Any libraries to link with when building the project.
Eg: -lpthread -lz -lc++

FLAGS_OPTIM
Optimisation flags for the compiler (Os, O3, etc).

Let’s see quick tip to access the Library Folder in OS X Yosemite and El Capitan. Library folder contains root features such as fonts, Internet plug-ins, and other items used by apps that are available to all users of the Mac. Why Library Folder is hidden in OS X?This folder is should be hidden due to root level position in OS X. How to access library on mac el capitan.

FLAGS_WARN
Warning flags for the compiler.
Eg: -Wall -Werror -Wpedantic

FLAGS_STD_C
The C language standard to use (c99, c11, etc).

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FLAGS_STD_CPP
The C++ language standard to use (c++11, c++14, etc).

FLAGS_OTHER
Any other flags to pass to the compiler.

FLAGS_C
Specific flags for the C compiler.

Erase an application and it will leave preference files left over in your Library folders. Most of the time, these files will use very little space and won’t cause a problem. The preferences will still be available on your Mac, too — this is convenient if you’re uninstalling an. Delete application mac library. Jan 12, 2020 The user's Library has long been a go-to location for troubleshooting issues with individual applications or components shared by multiple applications. If you haven't heard the refrain 'Delete the application's plist,' you either haven't been using a Mac for very long, or you've been lucky enough not to experience an application behaving badly.