Remove obsolete flag for WINARM64, fix TBB library lookup on Windows#241
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kevinushey
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Jul 23, 2026
RcppParallel 6.0.0 (via #241) stopped loading any TBB library in .onLoad on Windows, on the grounds that TBB is statically linked there. However, we still ship a stub tbb.dll (see src/install.libs.R) for packages that link with '-ltbb', e.g. via StanHeaders' LdFlags(). Those packages record a load-time dependency on 'tbb.dll' in their DLL's import table, and the Windows loader can only resolve it against an already-loaded module -- RcppParallel's lib/x64 directory is not on the DLL search path. As a result, with 6.0.0 on Windows, Stan-based packages fail to load with: LoadLibrary failure: The specified module could not be found. as seen with e.g. WSPsignal on r-universe: https://github.com/r-universe/cran/actions/runs/30028540221/job/89334243681 Restore the preload, resolving the stub directly (tbbLibraryPath() now reports static library names on Windows, so it cannot be used here).
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Now that
RcppParallelis using a newer version of the TBB, theTBB_USE_GCC_BUILTINSflag is irrelevant on Windows arm64The
tbbLibraryPath()function was also looking for.dllfiles on windows, so wasn't returning the static lib