[ET Trac] [Einstein Toolkit] #1611: Support Valgrind in Carpet/CarpetLib's poison code

[Einstein Toolkit]

#1611: Support Valgrind in Carpet/CarpetLib's poison code
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 Reporter:  rhaas        |       Owner:  eschnett           
     Type:  enhancement  |      Status:  new                
 Priority:  minor        |   Milestone:                     
Component:  Carpet       |     Version:  development version
 Keywords:               |  
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 Valgrind offers client requests (http://valgrind.org/docs/manual/mc-
 manual.html#mc-manual.clientreqs) that can be used to flag a region of
 memory as undefined (VALGRIND_MAKE_MEM_UNDEFINED).

 It may be useful for Carpet to mark regions that it poisons as undefined
 so that Valgrind triggers on them. Right now poisoning "initializes" the
 data as far as valgrind is concerned. Also cycling timelevels does not
 mark them as invalid as far as valgrind is concerned.

 I would envision an ExternalLibrary valgrind that provides an interface
 that Carpet can use (or just have Carpet check HAVE_VALGRIND).

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1611>
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