Voilà le code qui va chercher un symbole par son nom:

// Point the location to the appropriate symbol, if one is found.
SYMBOL *ResolveLocation (PROGRAM *Program, SECTION *Section, LOCATION *Location)
{
	if (Location->Symbol)
		return Location->Symbol;
	else
	{
		SECTION *CurSection;
		
		// For each section...
		for_each (CurSection, Program->Sections)
		{
			SYMBOL *CurSymbol;
			
			// For each symbol...
			for_each (CurSymbol, CurSection->Symbols)
			{
				// If the name matches, we have found the right symbol.
				if (CurSymbol->Exported && (!(strcmp (Location->SymbolName, CurSymbol->Name))))
				{
					// Set up the reloc accordingly, freeing its
					// destination string.
					Location->Symbol = CurSymbol;
					FreeLocationSymbolName (Section, Location);
					return CurSymbol;
				}
			}
		}
		
		return NULL;
	}
}

(et la macro for_each fait exactement ce que vous craignez ).