[R] What should I do regarding "DLL attempted to change..." warning ?

[Duncan Murdoch]

On 02/04/2010 7:01 AM, Tal Galili wrote:
> Hi all,
> 
> The call to:
> library(rJava)
> 
> Results in the following warning massage:
> 
> Warning message:
> In inDL(x, as.logical(local), as.logical(now), ...) :
>   DLL attempted to change FPU control word from 8001f to 9001f
> 
> 
> After some searching I found the following explanation:
> 
>> R expects all calls to DLLs (including the initializing call) to leave the
>> FPU control word unchanged. Many run-time libraries reset the FPU control
>> word during initialization; this will cause problems in R, and will result
>> in a warning message like "DLL attempted to change FPU control word from
>> 8001f to 9001f". The value 8001f that gets reported is in the format
>> expected by the C library routine _controlfp; the raw value that is used
>> in the FPU register is 037F.
> 
> 
> Also with a few old discussions that explain (for a package developer) how
> to avoid this.
> 
> 
> The question is, should I, as a useR, do anything regarding this warning
> massage ?

It's a bug in the rJava package, so you should report it to the 
maintainer of that package.

Duncan Murdoch

> 
> 
> I use winXP , here is my sessionInfo()
> 
> 
> R version 2.10.1 (2009-12-14)
> i386-pc-mingw32
> 
> locale:
> [1] LC_COLLATE=English_United States.1252
> [2] LC_CTYPE=English_United States.1252
> [3] LC_MONETARY=English_United States.1252
> [4] LC_NUMERIC=C
> [5] LC_TIME=English_United States.1252
> 
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
> 
> other attached packages:
> [1] rJava_0.8-3
> 
> 
> 
> Thanks,
> Tal
> 
> 
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