DLLs have no built-in mechanism for backward compatibility, and even minor changes to the DLL can render its internal structure so different from previous versions that attempting to use them will generally cause the application to crash. The problem arises when the version of the DLL on the computer is different than the version that was used when the program was being created. In this case, every application grows by the size of all the libraries it uses, and this can be quite large for modern programs. This contrasts with static libraries, which are functionally similar but copy the code directly into the application. By placing this code in a DLL, all the applications on the system can use it without using more memory. A simple example might be the GUI text editor, which is widely used by many programs. Shared libraries allow common code to be bundled into a wrapper, the DLL, which is used by any application software on the system without loading multiple copies into memory. In computing, DLL Hell is a term for the complications that arise when one works with dynamic-link libraries (DLLs) used with Microsoft Windows operating systems, particularly legacy 16-bit editions, which all run in a single memory space.ĭLL Hell can manifest itself in many different ways wherein applications neither launch nor work correctly.ĭLL Hell is the Windows ecosystem-specific form of the general concept dependency hell.ĭLLs are Microsoft's implementation of shared libraries.
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