[Rd] R 64 on Intel Mac check problem

[Simon Urbanek]

On Mar 26, 2008, at 8:05 PM, Bill Northcott wrote:

> On 26/03/2008, at 10:00 PM, Georgios wrote:
>> 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
>
> It may or may not be relevant, but there is a catastrophic bug in
> log10() in 10.5.2 for x86_64: it returns 0 for all arguments.  This
> has been discussed on the Scitech list.  Apple think they have fixed
> it, but I am sure they would want to hear of other cases or possible
> compiler issues, if it is their compiler you are using.
>
> So if you can get a minimal test case it would be very good to submit
> a bug.  It may be worth doing even if you cannot get a minimal case
> because all the sources are readily available.
>
> Finally last time I looked a few days back Simon's 64 bit Intel builds
> were failing.
>

Yes, the gcc-4.2 is known to be broken for x86_64 as you describe  
above (or in fact it miscompiles a few other things, too).  
Interestingly llvm-gcc-4.2 suffers from the same problem. That is the  
reason why the 64-bit binaries are currently not offered.
Switching to gcc-4.0 breaks other things on other targets, so there is  
no universal (and maintainable) solution that I'm aware of.

Thanks,
Simon