Vikram just ran into this ugly problem while trying to get Ben's code
up to speed with SVN libMesh.  Here's a minimal test case:


test.C:

extern "C" {
#include "petscoptions.h"
}
#include <tr1/unordered_map>



That's it.  Trying to compile this breaks in the CFDLab in all sorts
of fun ways.  We can work around it for now by turning off
TR1_UNORDERED_MAP support (which IIRC was giving Andrea some problems
over in ICES too), but I'm curious if anyone else can replicate this.
Is it a quirk of our particular (somewhat out of date) PETSc and gcc
versions, or is there some conflict between the PETSc namespace and
the new C++ hash map standard?
---
Roy

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