Support 64-bit build

src/include/FlashString/Object.hpp

@@ -66,7 +66,7 @@
  */
 #define FSTR_CHECK_STRUCT(name)                                                                                        \
 	static_assert(std::is_standard_layout<decltype(name)>::value, "FSTR structure not Standard Layout");               \
-	static_assert(offsetof(decltype(name), data) == sizeof(uint32_t), "FSTR structure alignment error");
+	static_assert(offsetof(decltype(name), data) % sizeof(uint32_t) == 0, "FSTR structure alignment error");
 
 /**
  * @brief Import an object from an external file with reference

src/include/FlashString/ObjectBase.hpp

@@ -103,7 +103,7 @@ class ObjectBase
 
 	/* Member data must be public for initialisation to work but DO NOT ACCESS DIRECTLY !! */
 
-	const uint32_t flashLength_;
+	const size_t flashLength_;
 	// const uint8_t data[]
 
 protected:

test/app/array.cpp

@@ -60,7 +60,7 @@ struct Item {
 
 	size_t printTo(Print& p) const
 	{
-		return p.printf("%s=%u, %ux%ux%u cm", toString(kind).c_str(), count, size.cx, size.cy, size.cz);
+		return p.printf("%s=%u, %lux%lux%lu cm", toString(kind).c_str(), count, size.cx, size.cy, size.cz);
 	}
 };
 

test/app/map.cpp

@@ -85,7 +85,7 @@ class MapTest : public TestGroup
 
 		TEST_CASE("Map of enum MapKey => String")
 		{
-			Serial.printf(_F("enumMap[%u]\n"), enumMap.length());
+			Serial.printf(_F("enumMap[%lu]\n"), enumMap.length());
 
 			Serial.println(_F("  for-loop:"));
 			for(unsigned i = 0; i < enumMap.length(); ++i) {