Enhance the base/rom extension to generate the symbol file of the rom built.
The symbol file is placed in epoc32/rom/<baseport_name>, along with the rom log and final oby file.
EXPORTS
?Get@HAL@@SAHW4TAttribute@HALData@@AAH@Z @ 1 NONAME ; public: static int __cdecl HAL::Get(enum HALData::TAttribute,int &)
?GetAll@HAL@@SAHAAHAAPAUSEntry@1@@Z @ 2 NONAME ; public: static int __cdecl HAL::GetAll(int &,struct HAL::SEntry * &)
?Set@HAL@@SAHW4TAttribute@HALData@@H@Z @ 3 NONAME ; public: static int __cdecl HAL::Set(enum HALData::TAttribute,int)
?Get@HAL@@SAHHW4TAttribute@HALData@@AAH@Z @ 4 NONAME ; public: static int __cdecl HAL::Get(int,enum HALData::TAttribute,int &)
?Set@HAL@@SAHHW4TAttribute@HALData@@H@Z @ 5 NONAME ; public: static int __cdecl HAL::Set(int,enum HALData::TAttribute,int)
?InitialValue@HalInternal@@2QBHB @ 6 NONAME ; public: static int const * const HalInternal::InitialValue