cannot compile for version of 6.2.2601/2602 without Python option on

[frankldm]

I am trying to build netgen in both windows and Linux platform, and the build script in windows is like this:

• netgen 6.2.2601 && 6.2.2602
• windows (win11) && Ubuntu (24)
• cmake 15 & gcc 14

-DCMAKE_BUILD_TYPE=Release ^
-DUSE_SUPERBUILD=ON ^
-DBUILD_ZLIB=ON ^
-DZLIB_USE_STATIC_LIBS=ON ^
-DUSE_GUI=OFF ^
-DUSE_PYTHON=OFF ^
-DUSE_OCC=OFF ^
-DUSE_STLGEOM=ON ^
-DUSE_CSG=ON ^

And both see the a same error at the Linux build with the same configuration.
/libsrc/core/flags.cpp

  void Flags :: DoArchive(Archive & archive)
  {
    archive & strflags & numflags & defflags & numlistflags & strlistflags & flaglistflags & anyflags;
  }

the error message is
error C2678: binary '&': no operator found which takes a left-hand operand of type 'ngcore::Archive'

[frankldm]

The root cause is:
1. SymbolTable<std::any> has a DoArchive method withenable_if_t<ARCHIVE::template is_archivable<T>>
2. is_archivable<std::any> is false because there's no operator& for std::any when NETGEN_PYTHON is not defined
3. This causes SymbolTable<std::any>::DoArchive to be excluded from compilation.
Possible fix is to add some check if no DoArchive at libsrc/core/symboltable.hpp below the auto DoArchive(ARCHIVE& ar) condition.

template<typename ARCHIVE>
auto DoArchive(ARCHIVE& ar)-> typename std::enable_if_t<!ARCHIVE::template is_archivable<T>, void> 
{
  ar & names;
}