Warning that can be eliminated

[MathieuDutSik]

When compiling with netcdf-cxx4 I have the following warning:

/home/mathieu/opt/netcdf-cxx4-4.3.1/include/ncGroup.h:18:14: warning: ‘netCDF::file_id’ defined but not used [-Wunused-variable]
18 | static int file_id;

When eliminating that line, everything goes fine and the warning disappears.

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[WardF]

Thank you!