[R-pkg-devel] Error in dyn.load(dllfile) : unable to load shared object

[Dirk Eddelbuettel]

On 1 December 2016 at 17:15, Aarti Singh wrote:
| Hello,
| 
| I am new to R package development. I am working on a package that has in
| its src folder  one (prime) cpp file and some helper cpp (X.Cpp, Y.Cpp) and
| one c file (Z.C) and their header files (X.h, Y.h and Z.h)
| 
| I am getting the following error when I do 'Build & Reload' in Rstudio.
| 
| "
| Error in dyn.load(dllfile) :
|   unable to load shared object '/Users/abcd/BART/bart_pkg1/src/bartpkg.so':
|   dlopen(/Users/abcd/BART/bart_pkg1/src/bartpkg.so, 6): Symbol not found:
| __ZN3RNG4nfixElm
|   Referenced from: /Users/abcd/BART/bart_pkg1/src/bartpkg.so
|   Expected in: flat namespace
|  in /Users/abcd/BART/bart_pkg1/src/bartpkg.so
| Calls: suppressPackageStartupMessages ... <Anonymous> -> load_all ->
| load_dll -> library.dynam2 -> dyn.load
| Execution halted
| 
| Exited with status 1.
| 
| "
| 
| I have followed the basic guidelines to build the package.
| 
| The .R file has directive #' @useDynLib bartpkg in the right place.
| 
| Also, the prime cpp file has the following tags in the right place.
| 1. #include <Rcpp.h>
|   using namespace Rcpp;
| 2.  //' @param x A single integer.
|      //' @export
|      // [[Rcpp::export]]
| 
| 
| And my NAMESPACE file shows 'useDynLib(bartpkg)' correctly.
| 
| I am able to see the 'bartpkg.so' shared object file in the src directory.
| 
| 
| I tried in the terminal this command "c++filt -n _ZN3RNG4nfixElm" and was
| able to see that the symbol in the error ' Symbol not found:
| __ZN3RNG4nfixElm' is coming from the .C file RNG.C and is because of a
| function 'nfix'.
| 
| But even if I remove the function 'nfix' or remove the RNG.C file
| altogether, the same error ' Symbol not found: __ZN3RNG4nfixElm' comes.
| 
| can it  be a flag issue that my compiler is not able to compile the 'C'
| file?
| I am able to see that all the cpp files generate respective object files,
| but I dont see anything like that for the C file.
| 
| I am using RStudio is the session info is
| > sessionInfo()
| R version 3.3.1 (2016-06-21)
| Platform: x86_64-apple-darwin13.4.0 (64-bit)
| Running under: OS X 10.11.6 (El Capitan)
| 
| 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  methods   base
| 
| other attached packages:
| [1] bartpkg_0.1.0        packrat_0.4.8-1      Rcpp_0.12.8
| msm_1.6.4            LaplacesDemon_16.0.1
| 
| loaded via a namespace (and not attached):
|  [1] roxygen2_5.0.1  lattice_0.20-34 mvtnorm_1.0-5   digest_0.6.10
| grid_3.3.1      magrittr_1.5
|  [7] stringi_1.1.2   Matrix_1.2-7.1  splines_3.3.1   tools_3.3.1
| stringr_1.1.0   survival_2.39-5
| [13] parallel_3.3.1  rsconnect_0.5   inline_0.3.14   expm_0.999-0
| 
| I am stuck at this problem for weeks now.
| Any help would be highly appreciated.

Please don't cross post, but I just gave you a hint at your identical
StackOverflow question:
http://stackoverflow.com/questions/40922814/error-in-dyn-loaddllfile-unable-to-load-shared-object-expected-in-flat-na#comment69060886_40922814

Dirk 
 
| Thank you.
| 
| -Aarti
| 
| 	[[alternative HTML version deleted]]
| 
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-- 
http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org