[Rd] compile 2.4.1 for linux on power cpus

[Peter Dalgaard]

Andrew Ferris wrote:
> Hello,
>
> I've been asked to get R (2.4.1) installed on a IBM p570 server. This is a server with power CPUs and is running SLES 10. It currently has 12GB of RAM so I'd like to make sure I have the 64 bit version of R so as to take advantage of the extra memory. Since it's a power CPU server that means I'll have to compile R from source. 
>
> I've searched the r_users list but most of the power CPU correspondence concerns either AIX or Macs. SLES 10 uses GCC 4.1.0 by default. Could someone please help me with some guidance on the necessary parameters for configure to ensure a 64 bit version of R is compiled? 
>  
>
>   
Just running the 64bit version of the OS usually suffices (at least on 
Linux variants). Easiest check on a running R is

 > .Machine$sizeof.pointer
[1] 4

which gives 8 on 64-bit builds.