Suppress santize alignment warnings on 64-bit builds

Author: mikee47

src/include/FlashString/Map.hpp

@@ -123,7 +123,7 @@ class Map : public Object<Map<KeyType, ContentType>, Pair>
 	 * @brief Get a map entry by index, if it exists
 	 * @note Result validity can be checked using if()
 	 */
-	const Pair valueAt(unsigned index) const
+	FSTR_ALIGN32 const Pair valueAt(unsigned index) const
 	{
 		if(index >= this->length()) {
 			return Pair::empty();
@@ -139,7 +139,7 @@ class Map : public Object<Map<KeyType, ContentType>, Pair>
 	 * @retval int If key isn't found, return -1
 	 */
 	template <typename TRefKey, typename T = KeyType>
-	typename std::enable_if<!std::is_class<T>::value, int>::type indexOf(const TRefKey& key) const
+	FSTR_ALIGN32 typename std::enable_if<!std::is_class<T>::value, int>::type indexOf(const TRefKey& key) const
 	{
 		auto p = this->data();
 		auto len = this->length();
@@ -159,8 +159,8 @@ class Map : public Object<Map<KeyType, ContentType>, Pair>
 	 * @retval int If key isn't found, return -1
 	 */
 	template <typename TRefKey, typename T = KeyType>
-	typename std::enable_if<std::is_same<T, String>::value, int>::type indexOf(const TRefKey& key,
-																			   bool ignoreCase = true) const
+	FSTR_ALIGN32 typename std::enable_if<std::is_same<T, String>::value, int>::type
+	indexOf(const TRefKey& key, bool ignoreCase = true) const
 	{
 		auto p = this->data();
 		auto len = this->length();

src/include/FlashString/MapPair.hpp

@@ -62,7 +62,8 @@ template <typename KeyType, class ContentType> class MapPair
 	/**
 	 * @brief Get the key (non-class key types)
 	 */
-	template <typename T = KeyType> typename std::enable_if<!std::is_class<T>::value, KeyType>::type key() const
+	template <typename T = KeyType>
+	FSTR_ALIGN32 typename std::enable_if<!std::is_class<T>::value, KeyType>::type key() const
 	{
 		// Ensure access is aligned for 1/2 byte keys
 		return readValue<KeyType>(&key_);
@@ -72,7 +73,7 @@ template <typename KeyType, class ContentType> class MapPair
 	 * @brief Get the key (String key type)
 	 */
 	template <typename T = KeyType>
-	typename std::enable_if<std::is_same<T, String>::value, const KeyType&>::type key() const
+	FSTR_ALIGN32 typename std::enable_if<std::is_same<T, String>::value, const KeyType&>::type key() const
 	{
 		return (key_ == nullptr) ? String::empty() : *key_;
 	}

src/include/FlashString/ObjectIterator.hpp

@@ -92,8 +92,9 @@ template <class ObjectType, typename ElementType> class ObjectIterator
 	 * @brief Accessor returns a reference for pointer-type elements
 	 */
 	template <typename T = ElementType>
-	typename std::enable_if<std::is_pointer<T>::value, const typename std::remove_pointer<ElementType>::type&>::type
-	operator*() const
+	FSTR_ALIGN32
+		typename std::enable_if<std::is_pointer<T>::value, const typename std::remove_pointer<ElementType>::type&>::type
+		operator*() const
 	{
 		auto ptr = data[index];
 		return ptr ? *ptr : std::remove_pointer<ElementType>::type::empty();

src/include/FlashString/Utility.hpp

@@ -141,7 +141,7 @@ template <typename T> FSTR_INLINE typename std::enable_if<sizeof(T) == 2, T>::ty
 	return static_cast<T>(pgm_read_word(ptr));
 }
 
-template <typename T> FSTR_INLINE typename std::enable_if<sizeof(T) == 4, T>::type readValue(const T* ptr)
+template <typename T> FSTR_ALIGN32 FSTR_INLINE typename std::enable_if<sizeof(T) == 4, T>::type readValue(const T* ptr)
 {
 	union {
 		uint32_t u32;

src/include/FlashString/Vector.hpp

@@ -170,7 +170,7 @@ template <class ObjectType> class Vector : public Object<Vector<ObjectType>, con
 		return printer().printTo(p);
 	}
 
-	FSTR_INLINE static const ObjectType& unsafeValueAt(const DataPtrType dataptr, unsigned index)
+	FSTR_ALIGN32 static const ObjectType& unsafeValueAt(const DataPtrType dataptr, unsigned index)
 	{
 		auto ptr = dataptr[index];
 		return ptr ? *ptr : ObjectType::empty();

src/include/FlashString/config.hpp

@@ -29,6 +29,7 @@
 #define FSTR_NOINLINE __attribute__((noinline))
 #define FSTR_ALIGNED __attribute__((aligned(4)))
 #define FSTR_PACKED __attribute__((packed))
+#define FSTR_ALIGN32 __attribute__((no_sanitize("alignment")))
 
 #ifdef __clang__
 // Clang has a habit of throwing stuff away we want