[Rcpp-devel] finding an undefined symbol

I'm writing a rather complicated package using CUDA and Rcpp. ?I have
everything compile and link ok, but when loading I get a

"unable to load shared object ..."
"... undefined symbol: ?_ZN5data39initSwabsESt6vector..."

Does anyone have any advice how to fix this and/or figure out what exactly
the problem is?

First you need to demangle the name.  On Linux systems there is a
utility called c++filt which, for this symbol shows

$ echo _ZN5data39initSwabsESt6vector | c++filt
data3::initSwabs(std::vector)

The most likely cause of the problem is that you have the CUDA package
headers in the -I list when you compile but not the library in the -L
list when linking.