Fix enabling of Use Serial Mesh

[mperego]

Check whether parallel ExodusII is available and use it to conditionally enable Use Serial Mesh. Thanks @bartgol for helping.

[mperego]

This is related to #761.

[ikalash]

Thanks @mperego ! I'll test this out on camobap later this afternoon.

[mperego]

@ikalash Thanks!
B.t.w. It appears that a couple of tests

CahnHillElast2D_Epetra
CahnHillElast2D_Tempus

were if-guarded by Albany_IOPX and were never enabled. This PR enables them and they are now failing:

Error, the parameter {name="Initial Order",type="int",value="0"}
in the parameter (sub)list "Albany Parameters->Piro->Tempus->Tempus Integrator->Time Step Control"
was not found in the list of valid parameters!

[ikalash]

Could you please add a print of whether ALBANY_PARALLEL_EXODUS is true/false in the CMakeLists.txt file? Would be useful to see this in the configure step, for debugging, etc.

[ikalash]

@ikalash Thanks! B.t.w. It appears that a couple of tests

CahnHillElast2D_Epetra
CahnHillElast2D_Tempus

were if-guarded by Albany_IOPX and were never enabled. This PR enables them and they are now failing:

Error, the parameter {name="Initial Order",type="int",value="0"}
in the parameter (sub)list "Albany Parameters->Piro->Tempus->Tempus Integrator->Time Step Control"
was not found in the list of valid parameters!

Thanks for the heads up - I'll fix this.

[bartgol]

Is there a reason not to just use ALBANY_PARALLEL_EXODUS as output variable?

[mperego]

Not really. I thought that
Performing Test PARALLEL_EXODUS_SUPPORTED - Success
was more expressive but at the same time wanted to keep Albany way of naming variables. I can change that.

[bartgol]

No, it's fine. I was just curious if there was some weird techincality in the CheckFunctionExists macro maybe. This is fine.

[bartgol]

Looks good. I have one comment, but not very important.

[mperego]

Could you please add a print of whether ALBANY_PARALLEL_EXODUS is true/false in the CMakeLists.txt file? Would be useful to see this in the configure step, for debugging, etc.

Yes, what message would you like to print? I don't see it done in a consistent way. Something like
ALBANY_PARALLEL_EXODUS set to True ?

[ikalash]

Could you please add a print of whether ALBANY_PARALLEL_EXODUS is true/false in the CMakeLists.txt file? Would be useful to see this in the configure step, for debugging, etc.

Yes, what message would you like to print? I don't see it done in a consistent way. Something like ALBANY_PARALLEL_EXODUS set to True ?

Yes exactly - to be consistent with the other messages printed when you configure Albany.

[ikalash]

This looks good. I just verified that everything is OK on camobap with your change. I'll go ahead and merge.

[mperego]

@ikalash thanks for checking camobap. I usually prefer to rebase and merge to avoid useless merge commits.

B.t.w. the failing CahnHill tests don't appear on Camobap because ALBANY_PARALLEL_EXODUS is false there.

[ikalash]

@mperego , yes, thank you for the reminder. I'll fix it in master.