[cfe-dev] UBSAN: undefined symbols when compiling on macOS Sierra (local config issue?)

Kevin Ushey via cfe-dev cfe-dev at lists.llvm.org
Thu Sep 29 10:23:16 PDT 2016

Hi everyone,

I'm running into some issues when attempting to link while using the
'undefined' sanitizer -- when linking my program, I'm getting errors of the

Undefined symbols for architecture x86_64:
  "___ubsan_handle_dynamic_type_cache_miss", referenced from: <...>
  "___ubsan_vptr_type_cache", referenced from: <...>
ld: symbol(s) not found for architecture x86_64

Looking at the generated ubsan dynamic library, those symbols are not

kevin at cdrv:/usr/local/llvm/db79113/lib/clang/4.0.0/lib/darwin
$ nm libclang_rt.ubsan_osx_dynamic.dylib | grep "ubsan_vptr_type_cache"

However, with clang-3.8 provided by Homebrew, these symbols are indeed

kevin at cdrv
$ nm libclang_rt.ubsan_osx_dynamic.dylib | grep "ubsan_vptr_type_cache"
0000000000b20c00 S ___ubsan_vptr_type_cache

which I think implies I'm probably missing some bit of configuration when
building clang with sanitizers. For reference, I'm building the LLVM tree

cmake -G "Ninja" ..                                  \
    -DCMAKE_C_COMPILER=/usr/bin/clang                \
    -DCMAKE_C_FLAGS="${INCLUDE_FLAGS}"               \
    -DCMAKE_CXX_COMPILER=/usr/bin/clang++            \
    -DCMAKE_CXX_FLAGS="${INCLUDE_FLAGS}"             \
    -DCMAKE_SHARED_LINKER_FLAGS="-L/usr/local/lib"   \
    -DCMAKE_BUILD_TYPE=Release                       \
    -DLLVM_ENABLE_EH=Yes                             \

cmake --build .

cmake --build . --target install

This is built with 'clang' and 'lldb' checked out in the 'llvm/tools'
folder, and 'compiler-rt', 'openmp', 'libcxx' and 'libcxxabi' checked out
in the 'llvm/projects' folder, and the master branch from the various git
mirrors for each project.

A bit of googling brought me to
but I'm not sure if it's relevant to this particular issue.

Any idea what I could be missing?

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