[ET Trac] [Einstein Toolkit] #456: Ensure functions are not defined twice

[Einstein Toolkit]

#456: Ensure functions are not defined twice
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  Reporter:  hinder       |       Owner:     
      Type:  enhancement  |      Status:  new
  Priority:  major        |   Milestone:     
 Component:  Cactus       |     Version:     
Resolution:               |    Keywords:     
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Comment (by eschnett):

 This is quite easy to achieve with GNU ld. We need to add the flag -Wl
 ,--whole-archive before the list of thorns, and -Wl,--no-whole-archive
 after the list of thorns. This ensures that all routines from all files
 from all thorns are included in the executable, leading to "duplicate
 symbols" errors if there are duplicate symbols.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/456#comment:1>
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