[Rcpp-devel] Error: .onLoad failed in loadNamespace()

[Dirk Eddelbuettel]

Hi Laurent,

On 27 May 2011 at 17:17, Laurent Gatto wrote:
| Dear all,
| 
| A basic packages with Rcpp modules produces the warning described
| below, that I would ideally, with your help, get rid of.
| 
| Rscript -e "require(Rcpp); Rcpp.package.skeleton(module=FALSE)"
| R CMD check anRpackage
| 
| produces obvious warnings related to badly formatted documentation and
| license. However
| 
| Rscript -e "require(Rcpp); Rcpp.package.skeleton(module=TRUE)"
| R CMD check anRpackage
| 
| produces this additional warning that puzzles me:
| 
| [ ...checker output... ]
| * checking whether the name space can be loaded with stated
| dependencies ... WARNING
| Error: .onLoad failed in loadNamespace() for ‘anRpackage’, details:
|   call: value[[3L]](cond)
|   error: failed to load module yada from package anRpackage
| Execution halted
| 
| A namespace must be able to be loaded with just the base namespace
| loaded: otherwise if the namespace gets loaded by a saved object, the
| session will be unable to start.
| 
| Probably some imports need to be declared in the NAMESPACE file.
| [ ...checker output...]
| 
| I suspect this may be related to the yada module not being exposed and
| thus not available when the package is loaded. Any further explanation
| or hints would however be warmly appreciated.

I think you are pretty close. As I recall, this 'warning' has been a bit of a
wart that won't quite go away.  I just checked again what we do in the unit
tests in file runit.Module.client.package.R: we build a package (ie create a
tar.gz) and then install from it.  That also triggers the warning, but passes
it. 

Romain may have more details about how this is related to module
initialization and startup.

Dirk



| 
| sessionInfo() is appended below.
| 
| Thank you very much in advance.
| 
| Best wishes,
| 
| Laurent
| 
| 
| > sessionInfo()
| R version 2.14.0 Under development (unstable) (2011-05-04 r55760)
| Platform: x86_64-unknown-linux-gnu (64-bit)
| 
| locale:
|  [1] LC_CTYPE=en_GB.utf8       LC_NUMERIC=C
|  [3] LC_TIME=en_GB.utf8        LC_COLLATE=en_GB.utf8
|  [5] LC_MONETARY=C             LC_MESSAGES=en_GB.utf8
|  [7] LC_PAPER=en_GB.utf8       LC_NAME=C
|  [9] LC_ADDRESS=C              LC_TELEPHONE=C
| [11] LC_MEASUREMENT=en_GB.utf8 LC_IDENTIFICATION=C
| 
| attached base packages:
| [1] stats     graphics  grDevices utils     datasets  methods   base
| 
| other attached packages:
| [1] Rcpp_0.9.4.1
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