[Users] Warnings when compiling on OS X.5.2

[Erik Schnetter]

On Mar 13, 2008, at 12:21:16, Joshua Faber wrote:

> Hi Erik,
>   I noticed you committed the most recent update to the Carpet  
> architectures listing.  I have the following warnings appearing when  
> I compile our code, and figured you might be able to help.  When I  
> compile on a machine running Leopard, Dual quad-core Xeons, OS  
> 10.5.2, with standard fink installations of gcc42, hdf5, and  
> openmpi, I get the following errors
>
> ld: warning alignment lost in merging tentative definition  
> _staticconformalrest_
> ld: warning alignment lost in merging tentative definition  
> _admbaserest_
> ld: warning alignment lost in merging tentative definition  
> _spacemaskrest_
> ld: warning alignment lost in merging tentative definition  
> _admmacrosrest_
>
>
> Ever seen this before?  I'll be checking soon to find out if this  
> obviously affects the output of the code or not.


[Reposted with permission.]

Joshua,

this seems to be a problem in gfortran.  There is a posting on one gcc  
mailing list (I don't remember the details) stating that gfortran  
requests too much alignment for certain data structures, especially  
more than gcc requests.  These data structures are used in Cactus to  
communicate the parameter values from C to Fortran, meaning they are  
defined by C and used from Fortran.  I believe that these warning  
messages are harmless, and I expect them to go away in future versions  
of gfortran.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/~eschnett/

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