mapping_collection not defined

[VictorEijkhout]

/work/00434/eijkhout/dealii/dealii-9.4.1/include/deal.II/numerics/vector_tools_project.templates.h:1020:49: warning: instantiation of variable 'dealii::hp::StaticMappingQ1<1>::mapping_collection'
required here, but no definition is available [-Wundefined-var-template]
    project(hp::StaticMappingQ1<dim, spacedim>::mapping_collection,
                                                ^
/work/00434/eijkhout/dealii/dealii-9.4.1/include/deal.II/hp/mapping_collection.h:150:45: note: forward declaration of template entity is here
    static MappingCollection<dim, spacedim> mapping_collection;

Logs attached.
deal94.zip

[bangerth]

@VictorEijkhout What compiler is this using? Perhaps clang 3.9?

This sounds related to #3705.

[VictorEijkhout]

Intel OneAPI. See the configure log for the exact version.

[bangerth]

I see, yes, this is an LLVM-based compiler, so I assume the warning is the same. Patch forthcoming.

[bangerth]

The patch in #14698 didn't quite seem to fix it all. So I'm reopening it -- maybe #14701 does it.

@VictorEijkhout Would you mind trying out #14701?