[MITgcm-devel] ifort/icc compiler flags and optfile

[Jean-Michel Campin]

Hi Patrick,

regarding point 2, it is recommanded to use
 linux_amd64_ifort11
for newer version of the intel compiler (line 7 from this optfile:
#  Build options for version 11 and newer of intel compiler on Linux AMD64 platform
)

regarding point 1, I don't care if you remove "-ip" from CFLAGS
(may be leaving it commented out ? with few words of description ?);
might be different if we remove it from FOPTIM where if could 
affect performance (but I did not check; may be someone did ?).

Cheers,
Jean-Michel

On Fri, Oct 19, 2012 at 09:42:35AM -0400, Patrick Heimbach wrote:
> 
> Hi there,
> 
> I have a couple of questions regarding our default optfile
> linux_amd64_ifort
> 
> 1. how important is the flag "-ip" in CFLAGS (or, does it matter at all)?
> Reason for asking is that some mpif wrappers use ifort for FC but gcc for CC (instead of icc).
> Without the "-ip" flag in CFLAGS the optfile will work for both cases, but with this flag the compiling chokes.
> Would we loose something if we just removed "-ip" in CFLAGS?
> (the ifort man-pages claim that "-ip" improves runtime performance, but we hardly have any C code, so perhaps not relevant?).
> 
> 2. looks like '-w95' and '-xW' are "deprecated (in ifort 12) and will be removed in a future release". Perhaps time to remove them from this default optfile (unless they're important for older ifort version?)
> 
> Cheers
> p.
> 
> ---
> Patrick Heimbach | heimbach at mit.edu | http://www.mit.edu/~heimbach
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