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
VariantInitialise__Fv @ 1 NONAME R3UNUSED ; VariantInitialise(void)
BaseLinAddress__7Variant @ 2 NONAME R3UNUSED ; Variant::BaseLinAddress(void)
MarkDebugPortOff__7Variant @ 3 NONAME R3UNUSED ; Variant::MarkDebugPortOff(void)
PowerReset__7Variant @ 4 NONAME R3UNUSED ; Variant::PowerReset(void)
Switches__7Variant @ 5 NONAME R3UNUSED ; Variant::Switches(void)
UartInit__7Variant @ 6 NONAME R3UNUSED ; Variant::UartInit(void)