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Platforms with MSB (Most Significant Byte)

5 messages · virgil@uv.es, Duncan Murdoch, Brian Ripley

Original
virgil@uv.es
# 
Hi,

I asked some days ago how to guess the o.s. the machine is running. I
found that it is stored in a variable called  R_PLATFORM. Now I need a
full list of  all the values this variable can have because I need to set
an option  depending on the endianness of the platform in which we are
compiling the package.

 Anyone can help me? Thanks,

             Virgilio Gómez Rubio

Dpto. Estadística e I. O. - Facultat de Matemàtiques
Avda. Vicent A. Estellés, 1 - 46100 Burjassot
Valencia - SPAIN

TLF: 00 32 96 386 43 62 - FAX: 00 32 96 398 35 99


---------- Forwarded message ----------
Date: Wed, 24 Jul 2002 10:24:14 +0200 (CEST)
From: virgil@uv.es
To: r-devel@lists.R-project.org
Subject: Guessing o.s. during installation

Hello,

 I would like to know how R can guess the operating system the machine is
running during the installation of a package. Besides, if the o.s. is SUN
I need to add an option to the compiling command (a define).

Regards and thanks,

VIrgilio




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Duncan Murdoch
#
On Thu, 25 Jul 2002 16:15:31 +0200 (CEST), you wrote:

            

      
      
      
    

        
I don't think a complete list exists.  I'd suggest running R to find
out:  Platform()$endian gives the result you need, so something like
this works in Windows:

 echo cat(Platform()$endian) | Rterm --slave

Duncan Murdoch

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      Brian Ripley
    

    

      
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R_PLATFORM is used set in etc/Renviron.  You can't find a complete
list, as R can be compiled on new platforms.  In any case, a user could
change the value.

The information you want is in the Rconfig.h header file, in
/* #undef WORDS_BIGENDIAN */
which is uncommented on big-endian systems.

This *is* documented in `Writing R Extensions'.  From R code, look at
.Platform$endian.

        
On Thu, 25 Jul 2002 virgil@uv.es wrote:

        

            

      
      
      
    

        

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      Brian Ripley
    

    

      
      #
    

  


  

      
On Thu, 25 Jul 2002, Duncan Murdoch wrote:

        

            

      
      
      
    

        
Platform() is to be deprecated in the next release: please use
.Platform$endian instead.

  
    

      
      
    

  


  


      

    

    
4 days later

    

      
      

        


  

        

      virgil@uv.es
    

    

      
      #
    

  


  

      
Hello,

 I think the best option isd the one proposed by Mr. Ripley. We have added
some C and the package compiles fine on Sun machines, and it should do
on other Big Endian machines.

 Thanks to all for your comments,

             Virgilio Gómez Rubio

Dpto. Estadística e I. O. - Facultat de Matemàtiques
Avda. Vicent A. Estellés, 1 - 46100 Burjassot
Valencia - SPAIN

TLF: 00 32 96 386 43 62 - FAX: 00 32 96 398 35 99




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