[MITgcm-support] mnc questions

[Ed Hill]

On Fri, 2005-12-16 at 00:03 -0600, Michael Schaferkotter wrote:
> hi ed:
> 
> the genmake tells the story:
> 
> ===  Checking system libraries  ===
>   Do we have the system() command using pgf77...  yes
>   Do we have the fdate() command using pgf77...  no
>   Do we have the etime() command using pgf77...  yes
>   Can we call simple C routines (here, "cloc()") using pgf77...  no
>   Can we use stat() through C calls...  no
>   Can we create NetCDF-enabled binaries...  yes
> 
> 'no' to 'Can we use stat()...'.
> 
> the mnc_max_fsize should have been set to around 20MB. i/m trying to get one set of variables per dump per .nc file.
> 
> the remark about the .nc files being the same size was in regard to the fact that i had altered mnc_max_fsize and the 
> 'before' and 'after' sizes didn/t change. now we know why...because 'we cannot use stat() through C calls...'.
> 
> am i now to point of customizing the mnc pkg code?

Hi Michael,

No, I don't think it requires any coding.  I think we just need to
figure out how to coax your PGI compiler into calling C subroutines from
Fortran.  And I think all that means is editing your optfile so that it
either uses the PGI C compiler by setting:

  CC='pgcc'

or by setting the correct name-mangling syntax such as:

  FC_NAMEMANGLE="#define FC_NAMEMANGLE(X) X ## _"

when using another C compiler such as gcc.  Please see the syntax in the
existing optfiles in:

  MITgcm/tools/build_options/*

for examples of the above settings.

Ed

ps - We have v5.2 of the PGI compiler suite (which includes the Fortran
and C compilers) installed on some of our Fedora Core 3 systems and I
just confirmed that it is able to use the C-provided stat() function
(and is correctly tested by genmake2) when using the PGI C compiler.  So
it certainly *can* be done with the PGI compilers on at least some Intel
systems with the optfile:

  MITgcm/tools/build_options/linux_ia32_pgf77+authors_fc3


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