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The v4 toolchain doesn't support LLVM TSAN with the -shared-libsan option. It only includes a static version of the TSAN runtime and lacks the dynamic version. LLVM-14 and higher have a dynamic TSAN runtime, so those version should support the combination of TSAN + -shared-libsan.
Antithesis testing is handled by specific evergreen variants with libvoidstar in the name (here). Antithesis provides a shared library `libvoidstar.so` that, if it is to be combined with clang sanitizers, requires us to build with the -static-libsan option.
This ticket tracks the need to enable that option in the evergreen antithesis + TSAN build variant.
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