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

[Grindeanu, Iulian R.]

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<mailto: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<mailto: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<mailto: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<mailto: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<mailto: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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