[MOAB-dev] moab/ParallelComm.hpp include order

[Nico Schlömer]

@Iulian, oh yes, you're right. But the error remains the same:
```
MPI_Comm my = MPI_COMM_WORLD;
```
The reason lies `moab_mpi.h`. There we find
```
/* Work around brain-dead netcdf.h */
#ifndef MPI_INCLUDED
#  undef MPI_Comm
#  undef MPI_Info
#  undef MPI_COMM_WORLD
#  undef MPI_INFO_NULL
#endif
```
Whoops! All of MPI undefined. No idea what's going on here and why.

Any insight?

--Nico

On Tue, Nov 3, 2015 at 12:02 AM Grindeanu, Iulian R. <iulian at mcs.anl.gov>
wrote:

> this error has nothing to do with moab/ParallelComm.hpp
>
> MPI_COMM_WORLD is just a constant, not a type
>
> this should give compile errors too.
>
> Or I don't get what are you trying to do
>
> #include <mpi.h>
>
> int main() {
>   MPI_COMM_WORLD my;
> }
>
>
> ------------------------------
> *From:* moab-dev-bounces at mcs.anl.gov [moab-dev-bounces at mcs.anl.gov] on
> behalf of Nico Schlömer [nico.schloemer at gmail.com]
> *Sent:* Monday, November 02, 2015 4:49 PM
> *To:* Vijay S. Mahadevan
> *Cc:* moab-dev at mcs.anl.gov
> *Subject:* Re: [MOAB-dev] moab/ParallelComm.hpp include order
>
> Alright. This
> ```
> #include <mpi.h>
> #include <moab/ParallelComm.hpp>
>
> int main() {
>   MPI_COMM_WORLD my;
> }
> ```
> creates the same
> ```
>  error: ‘MPI_COMM_WORLD’ was not declared in this scope
> ```
> Can you reproduce?
>
> Cheers,
> Nico
>
> On Mon, Nov 2, 2015 at 11:38 PM Nico Schlömer <nico.schloemer at gmail.com>
> wrote:
>
>> Including <moab/MOABConfig.h> doesn't help. I'll see about creating a
>> minimal example...
>>
>> --Nico
>>
>> On Mon, Nov 2, 2015 at 10:05 PM Vijay S. Mahadevan <vijay.m at gmail.com>
>> wrote:
>>
>>> Can you try including moab/MOABConfig.h directly in your test before
>>> ParallelComm and see if that resolves issues ?
>>>
>>> ParallelComm includes Interface.hpp which in turn includes
>>> MOABConfig.h. If you are including some other MOAB header before
>>> these, MOAB_HAVE_MPI might not be defined.
>>>
>>> Vijay
>>>
>>> On Mon, Nov 2, 2015 at 3:00 PM, Nico Schlömer <nico.schloemer at gmail.com>
>>> wrote:
>>> > It's a little convoluted with Trilinos includes right now, I'm trying
>>> to
>>> > generate a minimal example.
>>> >
>>> > --Nico
>>> >
>>> > On Mon, Nov 2, 2015 at 10:00 PM Vijay S. Mahadevan <vijay.m at gmail.com>
>>> > wrote:
>>> >>
>>> >> Nico, can you give an example ? What else did you include before
>>> >> ParallelComm to get such an error ? I am guessing this has to do with
>>> >> how moab/MOABConfig.h gets included since that's where MOAB_HAVE_MPI
>>> >> is defined.
>>> >>
>>> >> Vijay
>>> >>
>>> >> On Mon, Nov 2, 2015 at 2:47 PM, Nico Schlömer <
>>> nico.schloemer at gmail.com>
>>> >> wrote:
>>> >> > When playing with MOAB, I found that if I include the header
>>> >> > ```
>>> >> > #include <moab/ParallelComm.hpp>
>>> >> > ```
>>> >> > after something that's also using MPI, I'm getting strange
>>> compilation
>>> >> > errors of the kind
>>> >> > ```
>>> >> > error: ‘MPI_COMM_WORLD’ was not declared in this scope
>>> >> > ```
>>> >> > Has anyone else experienced this?
>>> >> >
>>> >> > Cheers,
>>> >> > Nico
>>>
>>
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