[ET Trac] [Einstein Toolkit] #1708: Add autoconf detection for #pragma omp simd

[Einstein Toolkit]

#1708: Add autoconf detection for #pragma omp simd
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 Reporter:  eschnett     |       Owner:                     
     Type:  enhancement  |      Status:  new                
 Priority:  major        |   Milestone:                     
Component:  Cactus       |     Version:  development version
 Keywords:               |  
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 This pragma simd-vectorizes a loop. It is part of OpenMP 4.0.
 Unfortunately, not all compilers support it. We need to add an autoconf
 rule.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1708>
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