[Pythonmac-SIG] SciPy install on Tiger with Python 2.4.1 framework

[Samuel M. Smith]

On 12 Aug, 2005, at 03:01, Bill Northcott wrote:

> On 12/08/2005, at 4:26 AM, Brian Granger wrote:
>
>> What version of gcc are you using?  I have not had any luck  
>> getting scipy and its dependencies working with gcc 4.0.
>>
>> Maybe this has changed?  Has anyone had success with gcc 4.0 yet?
>>
>> If you need to change the default version of gcc on Mac OS X use  
>> the command:
>>
>> sudo gcc_select 3.3
>>
>
> This is probably the solution.
> Why?
> because you can only use g77 with gcc-3.x OR gfortran with  
> gcc-4.x.  You cannot use g77 with gcc-4 they are incompatible.
> So if you have a Python/R/Perl/you-name-it binary containing  
> Fortran objects built with g77 you cannot extend it with code  
> compiled with gcc-4.  This is true on any platform.
>
> The issue arises mainly on Tiger because it does not have an  
> included Fortran compiler and out of the box it defaults to using  
> gcc-4.  Binary packages are shipped built with g77 and sometimes  
> including g77.  These are bound to fail on Tiger unless the default  
> compiler is changed using the gcc_select command as above.
>
> I have built Scipy with gcc-4, but you must use gfortran to compile  
> all the Fortran code for that to work.

How hard is it to replace g77 with gfortran?
>
> I do wish someone on Python, R-project or some other web site would  
> document this issue.  I must have posted at least twenty messages  
> saying the same thing.
>
> Bill Northcott
>

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