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boost::concurrent_flat_map (used in libutil and libstore) includes the C++17 <execution> header. GCC's libstdc++ implements parallel algorithms using Intel TBB as the backend, which creates a link-time dependency on libtbb even though we don't actually use any parallel algorithms. Disable the TBB backend for libstdc++ by setting _GLIBCXX_USE_TBB_PAR_BACKEND=0. This makes parallel algorithms fall back to serial execution, which is acceptable since we don't use them anyway. This only affects libstdc++ (GCC's standard library); other standard libraries like libc++ (LLVM) are unaffected. |
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