[R-SIG-Mac] Unload CRAN package and locally built package

[Gábor Csárdi]

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.urbanek at 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.gabor at 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
>>
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>