public CompilerSpecID getOldCompilerSpecID() {
		Collection<CompilerSpecDescription> compatibleCompilerSpecDescriptions =
			langDescription.getCompatibleCompilerSpecDescriptions();
		if (!compatibleCompilerSpecDescriptions.isEmpty()) {
			return compatibleCompilerSpecDescriptions.iterator().next().getCompilerSpecID();
		}
		return null;
	}
If this old language corresponds to a legacy language which was tied to a
specific compiler specification, a suitable ID will be returned.

@return associated compiler specification ID or null if unknown
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/util/OldLanguage.java