[llvm-bugs] [Bug 50597] New: error library not found

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50597

            Bug ID: 50597
           Summary: error library not found
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: MachO
          Assignee: unassignedbugs at nondot.org
          Reporter: schuett at gmail.com
                CC: gkm at fb.com, jezreel at gmail.com,
                    llvm-bugs at lists.llvm.org, smeenai at fb.com

On Big Sur I get:
: ld64.lld: error: library not found for -lSystem
          ld64.lld: error: library not found for -lresolv
          ld64.lld: error: library not found for -lc
          ld64.lld: error: library not found for -lm
          ld64.lld: error: library not found for -liconv

I believe the root cause is:

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)

lld currently uses fs::exists:
https://github.com/llvm/llvm-project/blob/6881f29a36a97102e5c89653a343f656231bc2f2/lld/MachO/DriverUtils.cpp#L252

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