Undefined symbols when linking against (development) RcppParallel on windows

[andrjohns]

I'm seeing errors about missing symbols when linking against the current GitHub version of RcppParallel on windows (across release & devel, and both x64 & arm64):

...
g++ -std=gnu++17 -shared -s -static-libgcc -o StanEstimators.dll tmp.def StanEstimators.o init.o -LD:/a/_temp/Library/RcppParallel/libs/x64 -lRcppParallel -LC:/rtools45/x86_64-w64-mingw32.static.posix/lib/x64 -LC:/rtools45/x86_64-w64-mingw32.static.posix/lib -LC:/R/bin/x64 -lR
C:\rtools45\x86_64-w64-mingw32.static.posix\bin/ld.exe: StanEstimators.o:StanEstimators:(.text$_ZZN4stan9callbacks17concurrent_writerINS0_20unique_stream_writerISt14basic_ofstreamIcSt11char_traitsIcEESt14default_deleteIS6_EEEEC4ERS9_ENKUlvE_clEv[_ZZN4stan9callbacks17concurrent_writerINS0_20unique_stream_writerISt14basic_ofstreamIcSt11char_traitsIcEESt14default_deleteIS6_EEEEC4ERS9_ENKUlvE_clEv]+0x1b9): undefined reference to `tbb::detail::r1::notify_bounded_queue_monitor(tbb::detail::r1::concurrent_monitor*, unsigned long long, unsigned long long)'
C:\rtools45\x86_64-w64-mingw32.static.posix\bin/ld.exe: StanEstimators.o:StanEstimators:(.text$_ZN4stan9callbacks17concurrent_writerINS0_20unique_stream_writerISt14basic_ofstreamIcSt11char_traitsIcEESt14default_deleteIS6_EEEED1Ev[_ZN4stan9callbacks17concurrent_writerINS0_20unique_stream_writerISt14basic_ofstreamIcSt11char_traitsIcEESt14default_deleteIS6_EEEED1Ev]+0x24d): undefined reference to `tbb::detail::r1::deallocate_bounded_queue_rep(unsigned char*, unsigned long long)'
C:\rtools45\x86_64-w64-mingw32.static.posix\bin/ld.exe: StanEstimators.o:StanEstimators:(.text$_ZN3tbb6detail2d224concurrent_bounded_queueIN5Eigen6MatrixIdLi1ELin1ELi1ELi1ELin1EEENS0_2d123cache_aligned_allocatorIS5_EEED1Ev[_ZN3tbb6detail2d224concurrent_bounded_queueIN5Eigen6MatrixIdLi1ELin1ELi1ELi1ELin1EEENS0_2d123cache_aligned_allocatorIS5_EEED1Ev]+0x20d): undefined reference to `tbb::detail::r1::deallocate_bounded_queue_rep(unsigned char*, unsigned long long)'
C:\rtools45\x86_64-w64-mingw32.static.posix\bin/ld.exe: StanEstimators.o:StanEstimators:(.text$_ZN4stan9callbacks17concurrent_writerINS0_20unique_stream_writerISt14basic_ofstreamIcSt11char_traitsIcEESt14default_deleteIS6_EEEEC1ERS9_[_ZN4stan9callbacks17concurrent_writerINS0_20unique_stream_writerISt14basic_ofstreamIcSt11char_traitsIcEESt14default_deleteIS6_EEEEC1ERS9_]+0x2e): undefined reference to `tbb::detail::r1::allocate_bounded_queue_rep(unsigned long long)'
C:\rtools45\x86_64-w64-mingw32.static.posix\bin/ld.exe: StanEstimators.o:StanEstimators:(.text$_ZN4stan9callbacks17concurrent_writerINS0_20unique_stream_writerISt14basic_ofstreamIcSt11char_traitsIcEESt14default_deleteIS6_EEEEclIRN5Eigen6MatrixIdLi1ELin1ELi1ELi1ELin1EEEEEvOT_[_ZN4stan9callbacks17concurrent_writerINS0_20unique_stream_writerISt14basic_ofstreamIcSt11char_traitsIcEESt14default_deleteIS6_EEEEclIRN5Eigen6MatrixIdLi1ELin1ELi1ELi1ELin1EEEEEvOT_]+0x26f): undefined reference to `tbb::detail::r1::notify_bounded_queue_monitor(tbb::detail::r1::concurrent_monitor*, unsigned long long, unsigned long long)'
collect2.exe: error: ld returned 1 exit status
no DLL was created
ERROR: compilation failed for package 'StanEstimators'
* removing 'C:/Users/RUNNER~1/AppData/Local/Temp/RtmpIvglkx/Rinst183856ec6bda/StanEstimators'
      -----------------------------------
ERROR: package installation failed

Full CI run with failures for the various windows versions here if it helps: https://github.com/andrjohns/StanEstimators/actions/runs/18257064205

Thanks!

[kevinushey]

Given that StanEstimators is using TBB APIs directly (rather than just the wrappers exposed by RcppParallel), I think it'll need to explicitly link to TBB via -ltbb as well. Note that RcppParallel no longer links to TBB by default, as we want to avoid ABI breakage when RcppParallel is updated with newer versions of TBB.

[andrjohns]

Ahh makes sense, thanks!