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

[Laurent Gatto]

Dear Romain,

On 31 May 2011 13:34, Romain Francois <romain at r-enthusiasts.com> wrote:
> Works fine for me. Laurent, can you try with the current svn version of
> Rcpp.
>
> svn checkout svn://svn.r-forge.r-project.org/svnroot/rcpp
> cd rcpp/pkg
> R CMD INSTALL Rcpp
> Rscript -e "require(Rcpp); Rcpp.package.skeleton(module=TRUE)"
> R CMD check anRpackage

Warning still there, although possibly with a hint:

* 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
could not find function "getClass"
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.

I also updated R-devel; session information is:

R version 2.14.0 Under development (unstable) (2011-05-30 r56024)
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=en_GB.utf8    LC_MESSAGES=en_GB.utf8
 [7] LC_PAPER=C                LC_NAME=C
 [9] LC_ADDRESS=C              LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_GB.utf8 LC_IDENTIFICATION=C

attached base packages:
[1] methods   stats     graphics  grDevices utils     datasets  base

other attached packages:
[1] Rcpp_0.9.4.2


Note that I observed this warning while working on a 'real' package.
In the hope to track its origin down and provide a reproducible
example, I realised that the warning also came up with the standard
Rcpp.package.skeleton output, which ended up in this thread. However,
to my surprise (and embarrassment), I do not have the warning in the
original package any more (whether with Rcpp 0.9.4.2 or 0.9.4.1). I
tried to revert some of the changes I did (moving Rcpp from Depends to
Imports for instance, removing the import(Rcpp) statement in the
NAMESPACE file,...) but without any success.

Not sure I am of any help here...

Best wishes,

Laurent


> Romain
>
> Le 30/05/11 21:58, Romain Francois a écrit :
>>
>> Le 28/05/11 04:04, Dirk Eddelbuettel a écrit :
>>>
>>> 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
>>
>> I'll have a go at installing a fresher R-devel and see what the next
>> move is. My guess is that R checks are tighter now.
>>
>>> |
>>> | 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
>>
>>
>
>
> --
> Romain Francois
> Professional R Enthusiast
> +33(0) 6 28 91 30 30
> http://romainfrancois.blog.free.fr
> http://romain-francois.com
> |- http://bit.ly/hdKhCy : Rcpp article in JSS
> |- http://bit.ly/elZJRJ : Montpellier Comedie Club - Avril 2011
> `- http://bit.ly/fhqbRC : Rcpp workshop in Chicago on April 28th
>
>
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