Fixed module loading (again), only audio tx works for now

firmware/baseband-tx/clock_recovery.hpp

@@ -116,19 +116,21 @@ private:
 template<typename ErrorFilter>
 class ClockRecovery {
 public:
+	using SymbolHandler = std::function<void(const float)>;
+
 	ClockRecovery(
 		const float sampling_rate,
 		const float symbol_rate,
 		ErrorFilter error_filter,
-		std::function<void(const float)> symbol_handler
-	) : symbol_handler { symbol_handler }
+		SymbolHandler symbol_handler
+	) : symbol_handler { std::move(symbol_handler) }
 	{
 		configure(sampling_rate, symbol_rate, error_filter);
 	}
 
 	ClockRecovery(
-		std::function<void(const float)> symbol_handler
-	) : symbol_handler { symbol_handler }
+		SymbolHandler symbol_handler
+	) : symbol_handler { std::move(symbol_handler) }
 	{
 	}
 
@@ -155,7 +157,7 @@ private:
 	dsp::interpolation::LinearResampler resampler;
 	GardnerTimingErrorDetector timing_error_detector;
 	ErrorFilter error_filter;
-	std::function<void(const float)> symbol_handler;
+	const SymbolHandler symbol_handler;
 
 	void resampler_callback(const float interpolated_sample) {
 		timing_error_detector(interpolated_sample,
@@ -166,7 +168,12 @@ private:
 	}
 
 	void symbol_callback(const float symbol, const float lateness) {
-		symbol_handler(symbol);
+		// NOTE: This check is to avoid std::function nullptr check, which
+		// brings in "_ZSt25__throw_bad_function_callv" and a lot of extra code.
+		// TODO: Make symbol_handler known at compile time.
+		if( symbol_handler) {
+			symbol_handler(symbol);
+		}
 
 		const float adjustment = error_filter(lateness);
 		resampler.advance(adjustment);