[Rd] R 64 on Intel Mac check problem

[Prof Brian Ripley]

I saw this yesterday, on my newly reinstalled iMac (10.5.2), with the 
Xcode compiler + gfortran from R 2.6.2.

It looks very like a compiler bug: if I insert a printf statement in 
stem.c I get the correct answer, and if I compile src/appl/stem.c without 
optimization I get the correct answer.

So, I suggest lowering the optimization level, but the worry always is 
that if you have one piece of code miscompiled there may be others.

On Tue, 25 Mar 2008, Georgios Marentakis wrote:

> Dear all, I have been following the instructions on
> http://cran.stat.sfu.ca/with the intention to install R with 64 bits
> support on an 8 core Intel Mac
> with 6 GB of memory. I am doing this so I can run an analysis that requires
> 1.6 gB of memory allocation and would not run on 32 bit version of R as I
> was advised and experienced.
> I have installed gcc 4.2 and gfortran 4.2 from the available sources on the
> web page and am using the copy and paste guide on the page.
>
> Now everything seems to be going fine until the point where the R packages
> are tested. In particular when the regression tests are run I get the
> following.
>
> running regression tests
> running code in 'reg-tests-1.R' ...\c
> OK
> running code in 'reg-tests-2.R' ...\c
> OK
> comparing 'reg-tests-2.Rout' to './reg-tests-2.Rout.save' ...\c
> 3756c3756
> <   The decimal point is 1 digit(s) to the right of the |
> ---
>>   The decimal point is at the |
> 3762c3762
> <   The decimal point is 1 digit(s) to the right of the |
> ---
>>   The decimal point is 1 digit(s) to the left of the |
> 3764c3764
> <   0 | 1111111111
> ---
>>   1 | 0000000000
> make[3]: *** [reg-tests-2.Rout] Error 1
> make[2]: *** [test-Reg] Error 2
> make[1]: *** [test-all-basics] Error 1
> make: *** [check] Error 2
>
> Would any of you be able to point me to what is the reason for this?
> thanks,
> georgios
>
> 	[[alternative HTML version deleted]]
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595