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
?GetAddressOfData@@YAPAPAXAAHAAPAX1@Z @ 1 NONAME ; void * * GetAddressOfData(int &, void * &, void * &)
?TestDataSize@@3JA @ 2 NONAME ; long TestDataSize
?WritableTestData@@3PAPAXA @ 3 NONAME ; void * * WritableTestData
?PointerToStaticData@@3PBQBXB @ 4 NONAME ; void const * * PointerToStaticData
?PointerToWritableData@@3PAPAXA @ 5 NONAME ; void * * PointerToWritableData