[MacPorts] #30120: NetCDF 4 c++ headers.

[MacPorts]

#30120: NetCDF 4 c++ headers.
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 Reporter:  f.baart@…          |       Owner:  takeshi@…           
     Type:  enhancement        |      Status:  new                 
 Priority:  Normal             |   Milestone:                      
Component:  ports              |     Version:                      
 Keywords:                     |        Port:  netcdf              
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Comment(by f.baart@…):

 I checked a build with and without --enable-cxx-4 and the old header files
 are always there, so it's not likely to break anything build against the
 old header files.
 It is not useful if netcdf-4 is not used, because in the configure.ac
 enable-cxx is disabled if netcdf-4 is not enabled:

 {{{
 if test "x$enable_netcdf_4" = xno; then
    enable_cxx_4=no
 fi
 }}}

 So the --enable-cxx-4 flag can be set when the netcdf-4 variant is used.
 No need for an extra variant.

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Ticket URL: <https://trac.macports.org/ticket/30120#comment:4>
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