Hi Simon, thanks for the answer, sorry, I should have included this, it is apparently not in sessionInfo().
So, this happens on 10.9.4 with R 3.1.1 and also on 10.8.5 with R 3.1.0. And the (10.8) CRAN binary version of igraph unloads cleanly on both of them. I am not sure how and why destructors would be called when unloading, igraph does not use any external pointers to keep C++ objects alive. They should be destroyed when returning the C/C++ call to R. It is certainly possible that they are not, because of a bug or something, but I cannot even unload if I do not call any igraph functions at all, just load the package. (Loading the package calls an igraph_init, but that only sets some global variables, it does not create any C or C++ objects.) But I definitely think that you are right in general, and this is some binary incompatibility between the R binary and my binary. It has been a long standing issue, actually. It never worked for me in the last ~5 years. I am also not really sure how to debug this, but will check with an R version compiled on my mac in a minute. Thank again, Best, Gabor On Thu, Sep 25, 2014 at 10:53 PM, Simon Urbanek <simon.urba...@r-project.org> wrote: > Gabor, > > what OS X version are you using? More recent OS X versions have slightly > different C++ ABI so you can't really mix C++ code compiled on SL and let's > say Mavericks - hence the two different sets of binaries. That would be my > guess here since igraph uses C++ and it involves destructor code on > unloading... > > Cheers, > Simon > > > On Sep 25, 2014, at 11:27 AM, Gábor Csárdi <csardi.ga...@gmail.com> wrote: > >> Hi all, >> >> I have a little mystery here, and ideas would be welcome. >> >> I would like to unload the package igraph. The following works fine >> with the package downloaded from CRAN (Snow Leopard package): >> >> install.packages("igraph") >> library(igraph) >> library(devtools) >> unload(inst("igraph")) >> >> However, if I build the package myself on my machine, then it does not >> work any more and unloading hangs. I can press CTRL+C to get the R >> prompt back, but every command hangs again. This is my machine: >> >> ~$ xcodebuild -version >> Xcode 5.1.1 >> Build version 5B1008 >> >> ~$ Rscript -e 'sessionInfo()' >> R version 3.1.1 (2014-07-10) >> Platform: x86_64-apple-darwin10.8.0 (64-bit) >> >> locale: >> [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8 >> >> attached base packages: >> [1] stats graphics grDevices utils datasets base >> >> It also hangs if I call dyn.unload() directly, instead of calling >> devtools; if I remove >> the igraph.so file from the package, then it works again, so it is >> definitely something with the .so file. >> >> I know this is not much work with, but if you have any guesses, please >> let me know. Thanks, >> Gabor >> >> _______________________________________________ >> R-SIG-Mac mailing list >> R-SIG-Mac@r-project.org >> https://stat.ethz.ch/mailman/listinfo/r-sig-mac >> > _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-mac