Help getting HelloMeshF77.F to run on GRUMMP

[Tim Tautges]

Are you doing this test on a 32bit machine?  I dimly recall it being an issue when applied to doubles and handles on 
64bit machines.  I could probably dig up the relevant gcc4.2 commit, I remember tracking it down to that.

- tim

Mark Miller wrote:
> Hi All,
> 
> Ok, got HelloMeshF77.F working against GRUMMP.
> 
> I did NOT need 4.3 gcc. I used gcc-3.2.3. %VAL() has been part of
> Fortran interface to gcc for 'simple' types for quite a while I guess.
> 
> I turns out the GRUMMP implementation was taking the name of the file as
> passed from fortran and just using it like a null terminated string. I
> added code to null terminate the string and HelloMeshF77.F now works.
> 
> So, I learned something. I do think we need to test the Fortran
> interface. I think Tim suggested last week that linking alone may not be
> a sufficient test and we might want to ensure we at least test those
> calls that pass string valued stuff. And, this experience bears out that
> concern.
> 
> Mark
> 
> On Tue, 2009-11-03 at 14:25 -0600, Tim Tautges wrote:
>> You're only partly correct there.  First, I don't think g77 is going to work for you at all, you should be using 
>> gfortran.  Second, you'll need the 4.3 series of gcc, because it was only with that version that gfortran supported call 
>> by value.  Third, you don't need to link with g++, as long as the linker you are calling is told the correct libraries 
>> to link in.  In MOAB, we accomplish this by putting those extra library link parts in a make variable which can be used 
>> by applications.  I don't remember, but I think they may be appended to IMESH_LIBS.
>>
>>> Finally, I cannot get HelloMeshF77 to run successfully. GRUMMP is always
>>> trying to add '.vmesh' to the filename. That is fine, but try as I
>>> might, no matter what I do, iMesh_load() winds up getting some scrambled
>>> name.
>>>
>> That's a GRUMMP issue, I suspect.
>>
>> - tim
>>
>>> Mark
>>>
>>>
>>>

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              Tim Tautges            Argonne National Laboratory
          (tautges at mcs.anl.gov)      (telecommuting from UW-Madison)
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