Dyld Library Path

dyld-shared-cache-extractor

As of macOS Big Sur, instead of shipping the system libraries with macOS, Apple ships a generated cache of all built in dynamic libraries and excludes the originals. This tool allows you to extract these libraries from the cache for reverse engineering.

DYLDLIBRARYPATH Location of the path which contains Oracle libraries for instant client and SQL.Plus (e.g. Always required. Use bundled instant client. Export DYLDLIBRARYPATH=someValue man dyld says: DYLDLIBRARYPATH. This is a colon separated list of directories that contain libraries. The dynamic linker searches these directories before it searches the default locations for libraries. It allows you to test new versions of existing libraries.

Usage

Extract the default shared cache to /tmp/libraries:

Installation

Homebrew:

Manually, after installing rust:

More details

There are a few different ways you can interact with these shared caches.

Depending on what you're doing inspecting them in Hopper is the easiest option
For a bit more functionality you can build the dyld_shared_cache_util target from the latest dyldsource dump, but this requires some modifications

The problem with the 2 options above is that they can lag behind format changes in the shared cache. This tool loads the private dsc_extractor.bundle from Xcode, meaning whichever it should always be able to extract the newest versions of the file for beta OS versions.

This logic is based on the function at the bottom of dyld3/shared-cache/dsc_extractor.cpp from the dyldsource dump.

Recently upgraded to the latest El Cap beta 15A216g. I have several build steps (Qt/clang/make/etc) that rely on DYLD_LIBRARY_PATH being set so that the proper libraries can be found. If I do this: