public boolean undefinePreprocValue(String nm) {
		IteratorSTL<Pair<String, String>> iter = preproc_defines.find(nm);
		if (iter.isEnd()) {
			return false;
		}
		preproc_defines.erase(iter);
		return true;
	}
Sets whether or not to print out warning info about
{@link Constructor}s which reference varnodes in the
unique space larger than {@link SleighBase#MAX_UNIQUE_SIZE}.
@param val whether to print info about contructors using large varnodes
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/pcodeCPort/slgh_compile/SleighCompile.java