[MITgcm-support] problems on alpha amchine

[Ed Hill]

On Sun, 2005-12-04 at 12:03 +0100, Martin Losch wrote:
> Hezi,
> 
> has someone answered you, yet?
> 
> The first problem looks like perfect F77 syntax to me, so I have no 
> clue why your compiler doesn't take it. Can it compile rUnit2c//'^2'? 
> Maybe one has to define a separate character variable, assign 
> rUnit2c//'^2/s^2' to it and then pass it to diags_mk_units? This is 
> really stupid but have you tried to set rUnit2c = ' m' instead of 'm '?

Hi Hezi,

I think Martin is right and that it is valid syntax.  I'm sorry your
compiler doesn't like it.  Perhaps there is a compiler option that will
help? 


> Maybe you can try reducing your optimization level. Again I don't know 
> your compiler, but -O5 sounds like aggressive optimization.

Some compilers for the alpha architecture have options that will allow
you to turn off some or all floating-point exceptions (or make them only
issue warnings instead of stopping your program).  The options are
usually called "-fpeX" where X is a number in the range 0--4.  So please
take a look at your compiler documentation and see if there are any
options that can help.

Ed

ps - As a last resort, one can extend the recently-added signal 
     handler code (MITgcm/eesupp/src/sigreg.c) to trap and ignore 
     any signals caused by floating point exceptions.  [This is
     what the "-fpe" options do.]

-- 
Edward H. Hill III, PhD
office:  MIT Dept. of EAPS;  Rm 54-1424;  77 Massachusetts Ave.
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