[llvm-bugs] [Bug 49713] New: Figure out how to do library lookup on Big Sur

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49713

            Bug ID: 49713
           Summary: Figure out how to do library lookup on Big Sur
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: MachO
          Assignee: unassignedbugs at nondot.org
          Reporter: jezreel at gmail.com
                CC: gkm at fb.com, jezreel at gmail.com,
                    llvm-bugs at lists.llvm.org, smeenai at fb.com

As per
https://developer.apple.com/documentation/macos-release-notes/macos-big-sur-11_0_1-release-notes:

> New in macOS Big Sur 11.0.1, the system ships with a built-in dynamic linker cache of all system-provided libraries. As part of this change, copies of dynamic libraries are no longer present on the filesystem. Code that attempts to check for dynamic library presence by looking for a file at a path or enumerating a directory will fail. Instead, check for library presence by attempting to dlopen() the path, which will correctly check for the library in the cache. (62986286)

There's some prior work in
https://mjtsai.com/blog/2020/06/26/reverse-engineering-macos-11-0/ which may be
helpful (c.f. dyld_shared_cache_util)

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