[ET Trac] [Einstein Toolkit] #1121: gcc 4.6+ compiler bug for isnan

[Einstein Toolkit]

#1121: gcc 4.6+ compiler bug for isnan
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  Reporter:  sbrandt  |       Owner:  eschnett           
      Type:  defect   |      Status:  new                
  Priority:  minor    |   Milestone:  ET_2012_11         
 Component:  Carpet   |     Version:  development version
Resolution:           |    Keywords:                     
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Comment (by rhaas):

 the using namespace std construct fails for me with ambiguous definition
 errors (see $1122). Explicitly using std::isnan helped but is difficult
 since isnan is not required in the older C++ standards it seems. I get
 errors from both Vectors (which is not so sophisticated) and CarpetLib's
 defs.hh (which seems to go to great lengths to find good versions).  The
 error does not happen with gcc 4.7. So if it was not for a "popular" home
 OS being affected, I would not consider this very major.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1121#comment:3>
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