public static boolean isUnknownCallingConvention(String callingConventionName) {
		return StringUtils.isBlank(callingConventionName) ||
			CompilerSpec.CALLING_CONVENTION_unknown.equals(callingConventionName);
	}
Determine if the specified calling convention name is treated as the unknown calling
convention (blank or {code "unknown"}).  Other unrecognized names will return false.
This static method does not assume any specific compiler specification.

@param callingConventionName calling convention name or null
@return true if specified name is blank or {code "unknown"}
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/CompilerSpec.java