[R] Rgdal windows binary warning message

[Duncan Murdoch]

Prof Brian Ripley wrote:
> This is a consequence of how VC++ compiled gdal.  R is protecting 
> itself against that.  Since R did not crash, there is nothing to worry 
> about.

To add to that:  the RGDAL maintainer could work around this bug in 
VC++.  I haven't used that compiler, but with others it is sufficient to 
ask R to set the FPU control word.  Instructions are here: 
<http://www.stats.uwo.ca/faculty/murdoch/software/compilingDLLs/index.html#fpu>

Duncan Murdoch
> 
> On Tue, 2 Aug 2005, Tony Gill wrote:
> 
> 
>>Hi all,
>>
>>I just downloaded windows binaries of RGDAL (from
>>http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/2.1/) and installed.
>>
>>I ran the example R_HOME\library\rgdal\R-ex\getPixmapGDAL.R and everything
>>seemed to work as expected. However I got the following warning message:
>>
>>DLL attempted to change FPU control word from 8001f to 9001f
>>
>>The R-help (?dyn.load) describes the problem as:
>>
>>************************************
>>External code must not change the floating point control word, but
>>    many DLLs do so.  Common changes are to set it to use 53 bit
>>    precision instead of R's default 64 bit precision, or to unmask
>>    some exceptions.  'dyn.load' detects such changes,  and restores
>>    R's control word to its default value of hex 8001F.   This may
>>    cause the DLL to malfunction; if so, it should be rewritten to
>>    save and restore the control word itself.  If 'warn.FPU' is set to
>>    'TRUE' using the 'options' function,  a warning will be printed.
>>    (If the warning says that the control word was changed from some
>>    other value than 8001F,  please report the circumstances to the
>>    Windows maintainers:   that probably indicates an internal bug.)
>>
>>************************************
>>
>>Does anyone know if this is a major problem for reading and manipulating
>>image files using RDAL? And if so are there windows binaries which have
>>patched it up?
>>
>>Thanks in advance
>>
>>Tony
>>
>>******************************************
>>Tony Gill - PhD Candidate
>>Centre for Remote Sensing & Spatial Information Science
>>School of Geography, Planning & Architecture
>>University of Queensland
>>Brisbane, Queensland, AUSTRALIA, 4072
>>Ph: 61-7-3365-7027
>>email: t.gill1 at uq.edu.au
>>
>>	[[alternative HTML version deleted]]
>>
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> 
>