diff --git a/Analyser/Static/AmstradCPC/StaticAnalyser.cpp b/Analyser/Static/AmstradCPC/StaticAnalyser.cpp
index c45adf2b2..ea1834a34 100644
--- a/Analyser/Static/AmstradCPC/StaticAnalyser.cpp
+++ b/Analyser/Static/AmstradCPC/StaticAnalyser.cpp
@@ -179,7 +179,7 @@ static bool CheckBootSector(const std::shared_ptr<Storage::Disk::Disk> &disk, co
 	return false;
 }
 
-Analyser::Static::TargetList Analyser::Static::AmstradCPC::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType potential_platforms) {
+Analyser::Static::TargetList Analyser::Static::AmstradCPC::GetTargets(const Media &media, const std::string &, TargetPlatform::IntType) {
 	TargetList destination;
 	auto target = std::make_unique<Target>();
 	target->confidence = 0.5;
diff --git a/Analyser/Static/Atari2600/StaticAnalyser.cpp b/Analyser/Static/Atari2600/StaticAnalyser.cpp
index 5e4416f5d..a84dc6ad5 100644
--- a/Analyser/Static/Atari2600/StaticAnalyser.cpp
+++ b/Analyser/Static/Atari2600/StaticAnalyser.cpp
@@ -88,7 +88,7 @@ static void DeterminePagingFor8kCartridge(Target &target, const Storage::Cartrid
 	else if(tigervision_access_count > atari_access_count) target.paging_model = Target::PagingModel::Tigervision;
 }
 
-static void DeterminePagingFor16kCartridge(Target &target, const Storage::Cartridge::Cartridge::Segment &segment, const Analyser::Static::MOS6502::Disassembly &disassembly) {
+static void DeterminePagingFor16kCartridge(Target &target, const Storage::Cartridge::Cartridge::Segment &, const Analyser::Static::MOS6502::Disassembly &disassembly) {
 	// Make an assumption that this is the Atari paging model.
 	target.paging_model = Target::PagingModel::Atari16k;
 
@@ -108,7 +108,7 @@ static void DeterminePagingFor16kCartridge(Target &target, const Storage::Cartri
 	if(mnetwork_access_count > atari_access_count) target.paging_model = Target::PagingModel::MNetwork;
 }
 
-static void DeterminePagingFor64kCartridge(Target &target, const Storage::Cartridge::Cartridge::Segment &segment, const Analyser::Static::MOS6502::Disassembly &disassembly) {
+static void DeterminePagingFor64kCartridge(Target &target, const Storage::Cartridge::Cartridge::Segment &, const Analyser::Static::MOS6502::Disassembly &disassembly) {
 	// Make an assumption that this is a Tigervision if there is a write to 3F.
 	target.paging_model =
 		(disassembly.external_stores.find(0x3f) != disassembly.external_stores.end()) ?
@@ -177,7 +177,7 @@ static void DeterminePagingForCartridge(Target &target, const Storage::Cartridge
 	}
 }
 
-Analyser::Static::TargetList Analyser::Static::Atari2600::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType potential_platforms) {
+Analyser::Static::TargetList Analyser::Static::Atari2600::GetTargets(const Media &media, const std::string &, TargetPlatform::IntType) {
 	// TODO: sanity checking; is this image really for an Atari 2600?
 	auto target = std::make_unique<Target>();
 	target->confidence = 0.5;
diff --git a/Analyser/Static/Coleco/StaticAnalyser.cpp b/Analyser/Static/Coleco/StaticAnalyser.cpp
index 3165f7538..08fd64744 100644
--- a/Analyser/Static/Coleco/StaticAnalyser.cpp
+++ b/Analyser/Static/Coleco/StaticAnalyser.cpp
@@ -52,7 +52,7 @@ static std::vector<std::shared_ptr<Storage::Cartridge::Cartridge>>
 	return coleco_cartridges;
 }
 
-Analyser::Static::TargetList Analyser::Static::Coleco::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType potential_platforms) {
+Analyser::Static::TargetList Analyser::Static::Coleco::GetTargets(const Media &media, const std::string &, TargetPlatform::IntType) {
 	TargetList targets;
 	auto target = std::make_unique<Target>(Machine::ColecoVision);
 	target->confidence = 1.0f - 1.0f / 32768.0f;
diff --git a/Analyser/Static/Commodore/StaticAnalyser.cpp b/Analyser/Static/Commodore/StaticAnalyser.cpp
index 8ae02d491..0a7a55e3e 100644
--- a/Analyser/Static/Commodore/StaticAnalyser.cpp
+++ b/Analyser/Static/Commodore/StaticAnalyser.cpp
@@ -42,7 +42,7 @@ static std::vector<std::shared_ptr<Storage::Cartridge::Cartridge>>
 	return vic20_cartridges;
 }
 
-Analyser::Static::TargetList Analyser::Static::Commodore::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType potential_platforms) {
+Analyser::Static::TargetList Analyser::Static::Commodore::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType) {
 	TargetList destination;
 
 	auto target = std::make_unique<Target>();
diff --git a/Analyser/Static/MSX/StaticAnalyser.cpp b/Analyser/Static/MSX/StaticAnalyser.cpp
index 256e188ee..b2bdf02de 100644
--- a/Analyser/Static/MSX/StaticAnalyser.cpp
+++ b/Analyser/Static/MSX/StaticAnalyser.cpp
@@ -260,7 +260,7 @@ static Analyser::Static::TargetList CartridgeTargetsFrom(
 	return targets;
 }
 
-Analyser::Static::TargetList Analyser::Static::MSX::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType potential_platforms) {
+Analyser::Static::TargetList Analyser::Static::MSX::GetTargets(const Media &media, const std::string &, TargetPlatform::IntType) {
 	TargetList destination;
 
 	// Append targets for any cartridges that look correct.
diff --git a/Analyser/Static/Macintosh/StaticAnalyser.cpp b/Analyser/Static/Macintosh/StaticAnalyser.cpp
index 658ce2897..9c9b203d8 100644
--- a/Analyser/Static/Macintosh/StaticAnalyser.cpp
+++ b/Analyser/Static/Macintosh/StaticAnalyser.cpp
@@ -9,7 +9,7 @@
 #include "StaticAnalyser.hpp"
 #include "Target.hpp"
 
-Analyser::Static::TargetList Analyser::Static::Macintosh::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType potential_platforms) {
+Analyser::Static::TargetList Analyser::Static::Macintosh::GetTargets(const Media &media, const std::string &, TargetPlatform::IntType) {
 	// This analyser can comprehend disks and mass-storage devices only.
 	if(media.disks.empty() && media.mass_storage_devices.empty()) return {};
 
diff --git a/Analyser/Static/Sega/StaticAnalyser.cpp b/Analyser/Static/Sega/StaticAnalyser.cpp
index 7e0db0c84..02ad18f23 100644
--- a/Analyser/Static/Sega/StaticAnalyser.cpp
+++ b/Analyser/Static/Sega/StaticAnalyser.cpp
@@ -13,7 +13,7 @@
 #include <algorithm>
 #include <cstring>
 
-Analyser::Static::TargetList Analyser::Static::Sega::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType potential_platforms) {
+Analyser::Static::TargetList Analyser::Static::Sega::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType) {
 	if(media.cartridges.empty())
 		return {};
 
diff --git a/Analyser/Static/ZX8081/StaticAnalyser.cpp b/Analyser/Static/ZX8081/StaticAnalyser.cpp
index 2f9681325..5fc80d64b 100644
--- a/Analyser/Static/ZX8081/StaticAnalyser.cpp
+++ b/Analyser/Static/ZX8081/StaticAnalyser.cpp
@@ -28,7 +28,7 @@ static std::vector<Storage::Data::ZX8081::File> GetFiles(const std::shared_ptr<S
 	return files;
 }
 
-Analyser::Static::TargetList Analyser::Static::ZX8081::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType potential_platforms) {
+Analyser::Static::TargetList Analyser::Static::ZX8081::GetTargets(const Media &media, const std::string &, TargetPlatform::IntType potential_platforms) {
 	TargetList destination;
 	if(!media.tapes.empty()) {
 		std::vector<Storage::Data::ZX8081::File> files = GetFiles(media.tapes.front());
diff --git a/Components/6850/6850.cpp b/Components/6850/6850.cpp
index 882850df7..100f82c8d 100644
--- a/Components/6850/6850.cpp
+++ b/Components/6850/6850.cpp
@@ -148,7 +148,7 @@ uint8_t ACIA::parity(uint8_t value) {
 	return value ^ (parity_ == Parity::Even);
 }
 
-bool ACIA::serial_line_did_produce_bit(Serial::Line *line, int bit) {
+bool ACIA::serial_line_did_produce_bit(Serial::Line *, int bit) {
 	// Shift this bit into the 11-bit input register; this is big enough to hold
 	// the largest transmission symbol.
 	++bits_received_;
diff --git a/Inputs/Keyboard.cpp b/Inputs/Keyboard.cpp
index 6491744e5..3d49081e7 100644
--- a/Inputs/Keyboard.cpp
+++ b/Inputs/Keyboard.cpp
@@ -19,7 +19,7 @@ Keyboard::Keyboard(const std::set<Key> &essential_modifiers) : essential_modifie
 Keyboard::Keyboard(const std::set<Key> &observed_keys, const std::set<Key> &essential_modifiers) :
 	observed_keys_(observed_keys), essential_modifiers_(essential_modifiers), is_exclusive_(false) {}
 
-bool Keyboard::set_key_pressed(Key key, char value, bool is_pressed) {
+bool Keyboard::set_key_pressed(Key key, char, bool is_pressed) {
 	const size_t key_offset = size_t(key);
 	if(key_offset >= key_states_.size()) {
 		key_states_.resize(key_offset+1, false);
diff --git a/Machines/Apple/AppleII/Video.cpp b/Machines/Apple/AppleII/Video.cpp
index c249b3540..c72ef18f0 100644
--- a/Machines/Apple/AppleII/Video.cpp
+++ b/Machines/Apple/AppleII/Video.cpp
@@ -252,7 +252,7 @@ void VideoBase::output_low_resolution(uint8_t *target, const uint8_t *const sour
 	}
 }
 
-void VideoBase::output_fat_low_resolution(uint8_t *target, const uint8_t *const source, size_t length, int column, int row) const {
+void VideoBase::output_fat_low_resolution(uint8_t *target, const uint8_t *const source, size_t length, int, int row) const {
 	const int row_shift = row&4;
 	for(size_t c = 0; c < length; ++c) {
 		// Fat low-resolution mode appears not to do anything to try to make odd and
diff --git a/Machines/Atari/ST/IntelligentKeyboard.cpp b/Machines/Atari/ST/IntelligentKeyboard.cpp
index a1f325b9c..56ad67a24 100644
--- a/Machines/Atari/ST/IntelligentKeyboard.cpp
+++ b/Machines/Atari/ST/IntelligentKeyboard.cpp
@@ -286,7 +286,7 @@ void IntelligentKeyboard::set_mouse_position(uint16_t x, uint16_t y) {
 	mouse_position_[1] = std::min(int(y), mouse_range_[1]);
 }
 
-void IntelligentKeyboard::set_mouse_keycode_reporting(uint8_t delta_x, uint8_t delta_y) {
+void IntelligentKeyboard::set_mouse_keycode_reporting(uint8_t, uint8_t) {
 	LOG("Unimplemented: set mouse keycode reporting");
 }
 
@@ -308,7 +308,7 @@ void IntelligentKeyboard::set_mouse_y_upward() {
 	mouse_y_multiplier_ = -1;
 }
 
-void IntelligentKeyboard::set_mouse_button_actions(uint8_t actions) {
+void IntelligentKeyboard::set_mouse_button_actions(uint8_t) {
 	LOG("Unimplemented: set mouse button actions");
 }
 
@@ -461,6 +461,10 @@ void IntelligentKeyboard::set_joystick_interrogation_mode() {
 }
 
 void IntelligentKeyboard::set_joystick_keycode_mode(VelocityThreshold horizontal, VelocityThreshold vertical) {
+	// TODO: honour velocity thresholds.
+	(void)horizontal;
+	(void)vertical;
+
 	joystick_mode_ = JoystickMode::KeyCode;
 	clear_joystick_events();
 }
@@ -494,7 +498,7 @@ void IntelligentKeyboard::interrogate_joysticks() {
 	}
 }
 
-void IntelligentKeyboard::set_joystick_monitoring_mode(uint8_t rate) {
+void IntelligentKeyboard::set_joystick_monitoring_mode(uint8_t) {
 	LOG("Unimplemented: joystick monitoring mode");
 }
 
diff --git a/Machines/Atari/ST/Video.cpp b/Machines/Atari/ST/Video.cpp
index 5a12ff781..a0a841e82 100644
--- a/Machines/Atari/ST/Video.cpp
+++ b/Machines/Atari/ST/Video.cpp
@@ -130,7 +130,7 @@ Video::Video() :
 	crt_.set_visible_area(crt_.get_rect_for_area(33, 260, 440, 1700, 4.0f / 3.0f));
 }
 
-void Video::set_ram(uint16_t *ram, size_t size) {
+void Video::set_ram(uint16_t *ram, size_t) {
 	ram_ = ram;
 }
 
diff --git a/Machines/Electron/Tape.cpp b/Machines/Electron/Tape.cpp
index bc9d7b548..ee6b94349 100644
--- a/Machines/Electron/Tape.cpp
+++ b/Machines/Electron/Tape.cpp
@@ -52,6 +52,9 @@ void Tape::set_is_in_input_mode(bool is_in_input_mode) {
 }
 
 void Tape::set_counter(uint8_t value) {
+	// TODO: use value.
+	(void)value;
+
 	output_.cycles_into_pulse = 0;
 	output_.bits_remaining_until_empty = 0;
 }
diff --git a/Machines/KeyboardMachine.cpp b/Machines/KeyboardMachine.cpp
index 6b4846318..29b419097 100644
--- a/Machines/KeyboardMachine.cpp
+++ b/Machines/KeyboardMachine.cpp
@@ -14,14 +14,14 @@ MachineTypes::MappedKeyboardMachine::MappedKeyboardMachine(const std::set<Inputs
 	keyboard_.set_delegate(this);
 }
 
-bool MappedKeyboardMachine::keyboard_did_change_key(Inputs::Keyboard *keyboard, Inputs::Keyboard::Key key, bool is_pressed) {
+bool MappedKeyboardMachine::keyboard_did_change_key(Inputs::Keyboard *, Inputs::Keyboard::Key key, bool is_pressed) {
 	const uint16_t mapped_key = get_keyboard_mapper()->mapped_key_for_key(key);
 	if(mapped_key == KeyNotMapped) return false;
 	set_key_state(mapped_key, is_pressed);
 	return true;
 }
 
-void MappedKeyboardMachine::reset_all_keys(Inputs::Keyboard *keyboard) {
+void MappedKeyboardMachine::reset_all_keys(Inputs::Keyboard *) {
 	// TODO: unify naming.
 	clear_all_keys();
 }
diff --git a/OSBindings/Mac/Clock Signal/Machine/CSMachine.mm b/OSBindings/Mac/Clock Signal/Machine/CSMachine.mm
index b5d73c8dc..8d7d841f0 100644
--- a/OSBindings/Mac/Clock Signal/Machine/CSMachine.mm	
+++ b/OSBindings/Mac/Clock Signal/Machine/CSMachine.mm	
@@ -72,7 +72,7 @@ struct ActivityObserver: public Activity::Observer {
 		[machine.delegate machine:machine led:[NSString stringWithUTF8String:name.c_str()] didChangeToLit:lit];
 	}
 
-	void announce_drive_event(const std::string &name, DriveEvent event) final {
+	void announce_drive_event(const std::string &name, DriveEvent) final {
 		[machine.delegate machine:machine ledShouldBlink:[NSString stringWithUTF8String:name.c_str()]];
 	}
 
diff --git a/OSBindings/Mac/Clock Signal/Machine/NSData+CRC32.m b/OSBindings/Mac/Clock Signal/Machine/NSData+CRC32.m
index 177830c3c..4296fb1b0 100644
--- a/OSBindings/Mac/Clock Signal/Machine/NSData+CRC32.m	
+++ b/OSBindings/Mac/Clock Signal/Machine/NSData+CRC32.m	
@@ -8,6 +8,8 @@
 
 #import "NSData+CRC32.h"
 
+#include <zlib.h>
+
 @implementation NSData (StdVector)
 
 - (NSNumber *)crc32 {
diff --git a/OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m b/OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m
index a30510de7..2b6759170 100644
--- a/OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m	
+++ b/OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m	
@@ -67,7 +67,7 @@
 	CVDisplayLinkStart(_displayLink);
 }
 
-static CVReturn DisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeStamp *now, const CVTimeStamp *outputTime, CVOptionFlags flagsIn, CVOptionFlags *flagsOut, void *displayLinkContext) {
+static CVReturn DisplayLinkCallback(__unused CVDisplayLinkRef displayLink, const CVTimeStamp *now, const CVTimeStamp *outputTime, __unused CVOptionFlags flagsIn, __unused CVOptionFlags *flagsOut, void *displayLinkContext) {
 	CSOpenGLView *const view = (__bridge CSOpenGLView *)displayLinkContext;
 
 	// Schedule an opportunity to check that the display link is still linked to the correct display.
@@ -298,7 +298,7 @@ static CVReturn DisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeSt
 	if(!self.shouldCaptureMouse) {
 		[_mouseHideTimer invalidate];
 
-		_mouseHideTimer = [NSTimer scheduledTimerWithTimeInterval:3.0 repeats:NO block:^(NSTimer * _Nonnull timer) {
+		_mouseHideTimer = [NSTimer scheduledTimerWithTimeInterval:3.0 repeats:NO block:^(__unused NSTimer * _Nonnull timer) {
 			[NSCursor setHiddenUntilMouseMoves:YES];
 			[self.delegate openGLViewWillHideOSMouseCursor:self];
 		}];
diff --git a/Outputs/DisplayMetrics.cpp b/Outputs/DisplayMetrics.cpp
index 8ab24a942..05632b4b1 100644
--- a/Outputs/DisplayMetrics.cpp
+++ b/Outputs/DisplayMetrics.cpp
@@ -50,7 +50,7 @@ void Metrics::announce_did_resize() {
 	frames_missed_ = frames_hit_ = 0;
 }
 
-void Metrics::announce_draw_status(size_t lines, std::chrono::high_resolution_clock::duration duration, bool complete) {
+void Metrics::announce_draw_status(size_t, std::chrono::high_resolution_clock::duration, bool complete) {
 	if(!complete) {
 		++frames_missed_;
 	} else {
diff --git a/Storage/Data/ZX8081.cpp b/Storage/Data/ZX8081.cpp
index 9db56d313..f9393acb9 100644
--- a/Storage/Data/ZX8081.cpp
+++ b/Storage/Data/ZX8081.cpp
@@ -125,6 +125,8 @@ std::vector<uint8_t> Storage::Data::ZX8081::DataFromString(const std::wstring &s
 	std::vector<uint8_t> data;
 
 	// TODO
+	(void)string;
+	(void)is_zx81;
 
 	return data;
 }
diff --git a/Storage/Disk/Encodings/AppleGCR/Encoder.cpp b/Storage/Disk/Encodings/AppleGCR/Encoder.cpp
index db8f60765..fc9308d3b 100644
--- a/Storage/Disk/Encodings/AppleGCR/Encoder.cpp
+++ b/Storage/Disk/Encodings/AppleGCR/Encoder.cpp
@@ -103,6 +103,9 @@ Storage::Disk::PCMSegment AppleGCR::five_and_three_data(const uint8_t *source) {
 	data[411] = epilogue[1];
 	data[416] = epilogue[2];
 
+	// TODO: encode.
+	(void)source;
+
 //	std::size_t source_pointer = 0;
 //	std::size_t destination_pointer = 3;
 //	while(source_pointer < 255) {
diff --git a/Storage/Disk/Encodings/MFM/Encoder.cpp b/Storage/Disk/Encodings/MFM/Encoder.cpp
index accc7280c..391cfac7d 100644
--- a/Storage/Disk/Encodings/MFM/Encoder.cpp
+++ b/Storage/Disk/Encodings/MFM/Encoder.cpp
@@ -156,7 +156,7 @@ class FMEncoder: public Encoder {
 			output_short(FMDeletedDataAddressMark);
 		}
 
-		size_t item_size(SurfaceItem item) {
+		size_t item_size(SurfaceItem) {
 			// Marks are just slightly-invalid bytes, so everything is the same length.
 			return 2;
 		}
diff --git a/Storage/Disk/Track/UnformattedTrack.cpp b/Storage/Disk/Track/UnformattedTrack.cpp
index ed0e1669d..b80f75e7b 100644
--- a/Storage/Disk/Track/UnformattedTrack.cpp
+++ b/Storage/Disk/Track/UnformattedTrack.cpp
@@ -17,7 +17,7 @@ Track::Event UnformattedTrack::get_next_event() {
 	return event;
 }
 
-Storage::Time UnformattedTrack::seek_to(const Time &time_since_index_hole) {
+Storage::Time UnformattedTrack::seek_to(const Time &) {
 	return Time(0);
 }
 
diff --git a/Storage/Tape/Parsers/Commodore.cpp b/Storage/Tape/Parsers/Commodore.cpp
index 11c77757b..a8a15d3bd 100644
--- a/Storage/Tape/Parsers/Commodore.cpp
+++ b/Storage/Tape/Parsers/Commodore.cpp
@@ -120,6 +120,9 @@ void Header::serialise(uint8_t *target, uint16_t length) {
 		case Header::EndOfTape:				target[0] = 0x05;	break;
 	}
 
+	// TODO: validate length.
+	(void)length;
+
 	std::memcpy(&target[1], data.data(), 191);
 }