[llvm-bugs] [Bug 51230] New: BugPoint tests are failing when compiled with LTO

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51230

            Bug ID: 51230
           Summary: BugPoint tests are failing when compiled with LTO
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: MachO
          Assignee: unassignedbugs at nondot.org
          Reporter: phosek at chromium.org
                CC: gkm at fb.com, jezreel at gmail.com,
                    llvm-bugs at lists.llvm.org, smeenai at fb.com

I tried enabling the use of ld64.lld in our toolchain build that uses (regular)
LTO but I see a number of BugPoint tests failure which all looks the same:

```
Error opening
'/opt/s/w/ir/x/w/staging/llvm_build/tools/clang/stage2-bins/lib/BugpointPasses.dylib':
dlopen(/opt/s/w/ir/x/w/staging/llvm_build/tools/clang/stage2-bins/lib/BugpointPasses.dylib,
9): Symbol not found: __ZNK4llvm4Pass11getPassNameEv
  Referenced from:
/opt/s/w/ir/x/w/staging/llvm_build/tools/clang/stage2-bins/lib/BugpointPasses.dylib
  Expected in: flat namespace
 in
/opt/s/w/ir/x/w/staging/llvm_build/tools/clang/stage2-bins/lib/BugpointPasses.dylib
  -load request ignored.
bugpoint: Unknown command line argument '-bugpoint-crashcalls'.  Try:
'/opt/s/w/ir/x/w/staging/llvm_build/tools/clang/stage2-bins/bin/bugpoint
--help'
bugpoint: Did you mean '--print-after-all'?
```

I suspect it's related to the use of -flat_namespace, see
https://github.com/llvm/llvm-project/blob/e69a8c42135606e60446d5e78144357a9e429c77/llvm/cmake/modules/HandleLLVMOptions.cmake#L174,
which should be supported under LTO according to
https://github.com/llvm/llvm-project/blob/d7d2e4545e6b04ea29ffd05ebef2f7c26590b925/lld/MachO/LTO.cpp#L83
but perhaps it doesn't behave the same way as ld64?

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