[ET Trac] [Einstein Toolkit] #1713: Avoid build-time warning

[Einstein Toolkit]

#1713: Avoid build-time warning
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 Reporter:  eschnett               |       Owner:                     
     Type:  defect                 |      Status:  new                
 Priority:  major                  |   Milestone:                     
Component:  EinsteinToolkit thorn  |     Version:  development version
 Keywords:                         |  
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 I see this warning when building. I assume this should instead be a run-
 time warning or error?

 {{{
 /Users/eschnett/Cbeta/arrangements/EinsteinEvolve/GRHydro_InitData/src/GRHydro_PoloidalMagFieldM.F90:110:2:
 warning: #warning "This algorithm does only work on Cartesian grids!!"
 [-Wcpp]
  #warning "This algorithm does only work on Cartesian grids!!"
   ^
 }}}

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1713>
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