--- nono/vm/test_busio.cpp	2026/04/29 17:04:36	1.1.1.2
+++ nono/vm/test_busio.cpp	2026/04/29 17:04:45	1.1.1.3
@@ -15,7 +15,7 @@ class IODevice
 {
  public:
 	IODevice() {}
-	virtual ~IODevice() {}
+	virtual ~IODevice();
 
 	virtual uint64 Read8(uint32 addr) { return 0xef; }
 	virtual uint64 Read16(uint32 addr) {
@@ -39,6 +39,7 @@ class IODevice
 	}
 	virtual uint64 Peek8(uint32 addr) { return 0xff; }
 };
+IODevice::~IODevice() { }
 
 #define SELFTEST
 #include "busio.h"
@@ -47,7 +48,7 @@ class TestByteDev : public IODevice
 {
  public:
 	TestByteDev() {}
-	virtual ~TestByteDev() {}
+	virtual ~TestByteDev() override;
 
 	static const uint32 NPORT = 4;
 	uint32 reg[NPORT] {};
@@ -66,12 +67,13 @@ class TestByteDev : public IODevice
 		return reg[addr];
 	}
 };
+TestByteDev::~TestByteDev() { }
 
 class TestWordDev : public IODevice
 {
  public:
 	TestWordDev() {}
-	virtual ~TestWordDev() {}
+	virtual ~TestWordDev() override;
 
 	static const uint32 NPORT = 4;
 	uint32 reg[NPORT] {};
@@ -90,6 +92,7 @@ class TestWordDev : public IODevice
 		return reg[addr];
 	}
 };
+TestWordDev::~TestWordDev() { }
 
 // テストデータ
 // expected[] の1エントリは1バイトを表す(WordDevの時も同様)。