I'm having problems getting code that runs under 3.6.1 on MacOSX (and Ubuntu) to run the R version 4.0.0 on Windows. I have not tested R 4.0.0 on mac (yet).
Key question: Has anything changed in R 4.0.0/Windows regarding how dynamically loaded libraries are accessed? Can someone please point me in the right direction? WORKS On MacOSX Under: R version 3.6.1 (2019-07-05) -- "Action of the Toes" after dynamically loading ../../bin/qFVSie.so: > getLoadedDLLs()$qFVSie DLL name: qFVSie Filename: /Users/ncrookston/open-fvs/branches/NickDev/tests/APIviaR/../../bin/qFVSie.so Dynamic lookup: TRUE # expected output is correct: > i=1 > .C("CfvsSpeciesCode",fvs_code="",fia_code="",plant_code="", indx=as.integer(i)) $fvs_code [1] "WP" $fia_code [1] "119" $plant_code [1] "PIMO3" $indx [1] 1 ----- from the nm command: $ nm ../../bin/qFVSie.so | grep -i cfvsspeciescode 00000000000a7980 T _CfvsSpeciesCode ------------------------------------ Fails On Win10 Under: R version 4.0.0 Under development (Rtools 4.0) (2019-11-23 r77455) -- "Blame Jeroen" NOTE: The .dll is built using the most recent Rtools as advised by Jeroen. > getLoadedDLLs()$qFVSie DLL name: qFVSie Filename: C:/Users/nickc/open-fvs/branches/NickDev/tests/APIviaR/../../bin/qFVSie.dll Dynamic lookup: TRUE > i=1 > .C("CfvsSpeciesCode",fvs_code="",fia_code="",plant_code="", indx=as.integer(i)) Error in .C("CfvsSpeciesCode", fvs_code = "", fia_code = "", plant_code = "", : C symbol name "CfvsSpeciesCode" not in load table ----- from the nm command on Win10: nm ../../bin/qFVSie.dll | grep -i cfvsspeciescode 00000000707a21f0 T CfvsSpeciesCode ----------------------------------- If advised to do so, I'll create a simple and fully reproducible example, but perhaps I missing something simple (like compiler switch needed to create my .dll that has not been necessary until now). Thanks, Nick -- Nicholas L. Crookston Forestry Research Consultant Moscow Idaho USA [[alternative HTML version deleted]] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel