diff --git a/native/jni/Android.mk b/native/jni/Android.mk
index 69a9aa970..da05894f5 100644
--- a/native/jni/Android.mk
+++ b/native/jni/Android.mk
@@ -28,7 +28,9 @@ LATIN_IME_SRC_FULLPATH_DIR := $(LOCAL_PATH)/$(LATIN_IME_SRC_DIR)
 
 LOCAL_C_INCLUDES += $(LATIN_IME_SRC_FULLPATH_DIR) $(LATIN_IME_SRC_FULLPATH_DIR)/gesture
 
-LOCAL_CFLAGS += -Werror -Wall -Wextra -Weffc++ -Wno-system-headers
+LOCAL_CFLAGS += -Werror -Wall -Wextra -Weffc++ -Wformat=2 -Wcast-qual -Wcast-align \
+    -Wwrite-strings -Wfloat-equal -Wpointer-arith -Winit-self -Wredundant-decls \
+    -Winline -Wno-system-headers
 
 # To suppress compiler warnings for unused variables/functions used for debug features etc.
 LOCAL_CFLAGS += -Wno-unused-parameter -Wno-unused-function
diff --git a/native/jni/src/additional_proximity_chars.h b/native/jni/src/additional_proximity_chars.h
index d420c4664..0333c2dbd 100644
--- a/native/jni/src/additional_proximity_chars.h
+++ b/native/jni/src/additional_proximity_chars.h
@@ -39,7 +39,7 @@ class AdditionalProximityChars {
     static const int EN_US_ADDITIONAL_U_SIZE = 4;
     static const int32_t EN_US_ADDITIONAL_U[];
 
-    static bool isEnLocale(const char *localeStr) {
+    AK_FORCE_INLINE static bool isEnLocale(const char *localeStr) {
         const size_t LOCALE_EN_US_SIZE = strlen(LOCALE_EN_US);
         return localeStr && strlen(localeStr) >= LOCALE_EN_US_SIZE
                 && strncmp(localeStr, LOCALE_EN_US, LOCALE_EN_US_SIZE) == 0;
diff --git a/native/jni/src/binary_format.h b/native/jni/src/binary_format.h
index c0aec50d7..7bb976097 100644
--- a/native/jni/src/binary_format.h
+++ b/native/jni/src/binary_format.h
@@ -123,7 +123,7 @@ class BinaryFormat {
     static int skipAllAttributes(const uint8_t *const dict, const uint8_t flags, const int pos);
 };
 
-inline int BinaryFormat::detectFormat(const uint8_t *const dict) {
+AK_FORCE_INLINE int BinaryFormat::detectFormat(const uint8_t *const dict) {
     // The magic number is stored big-endian.
     const uint32_t magicNumber = (dict[0] << 24) + (dict[1] << 16) + (dict[2] << 8) + dict[3];
     switch (magicNumber) {
@@ -166,7 +166,8 @@ inline unsigned int BinaryFormat::getHeaderSize(const uint8_t *const dict) {
     }
 }
 
-inline int BinaryFormat::getGroupCountAndForwardPointer(const uint8_t *const dict, int *pos) {
+AK_FORCE_INLINE int BinaryFormat::getGroupCountAndForwardPointer(const uint8_t *const dict,
+        int *pos) {
     const int msb = dict[(*pos)++];
     if (msb < 0x80) return msb;
     return ((msb & 0x7F) << 8) | dict[(*pos)++];
@@ -176,7 +177,8 @@ inline uint8_t BinaryFormat::getFlagsAndForwardPointer(const uint8_t *const dict
     return dict[(*pos)++];
 }
 
-inline int BinaryFormat::getCodePointAndForwardPointer(const uint8_t *const dict, int *pos) {
+AK_FORCE_INLINE int BinaryFormat::getCodePointAndForwardPointer(const uint8_t *const dict,
+        int *pos) {
     const int origin = *pos;
     const int codePoint = dict[origin];
     if (codePoint < MINIMAL_ONE_BYTE_CHARACTER_VALUE) {
@@ -200,7 +202,7 @@ inline int BinaryFormat::readFrequencyWithoutMovingPointer(const uint8_t *const
     return dict[pos];
 }
 
-inline int BinaryFormat::skipOtherCharacters(const uint8_t *const dict, const int pos) {
+AK_FORCE_INLINE int BinaryFormat::skipOtherCharacters(const uint8_t *const dict, const int pos) {
     int currentPos = pos;
     int character = dict[currentPos++];
     while (CHARACTER_ARRAY_TERMINATOR != character) {
@@ -226,7 +228,7 @@ static inline int attributeAddressSize(const uint8_t flags) {
     */
 }
 
-static inline int skipExistingBigrams(const uint8_t *const dict, const int pos) {
+static AK_FORCE_INLINE int skipExistingBigrams(const uint8_t *const dict, const int pos) {
     int currentPos = pos;
     uint8_t flags = BinaryFormat::getFlagsAndForwardPointer(dict, &currentPos);
     while (flags & BinaryFormat::FLAG_ATTRIBUTE_HAS_NEXT) {
@@ -255,7 +257,7 @@ inline int BinaryFormat::skipFrequency(const uint8_t flags, const int pos) {
     return FLAG_IS_TERMINAL & flags ? pos + 1 : pos;
 }
 
-inline int BinaryFormat::skipShortcuts(const uint8_t *const dict, const uint8_t flags,
+AK_FORCE_INLINE int BinaryFormat::skipShortcuts(const uint8_t *const dict, const uint8_t flags,
         const int pos) {
     if (FLAG_HAS_SHORTCUT_TARGETS & flags) {
         return pos + shortcutByteSize(dict, pos);
@@ -264,7 +266,7 @@ inline int BinaryFormat::skipShortcuts(const uint8_t *const dict, const uint8_t
     }
 }
 
-inline int BinaryFormat::skipBigrams(const uint8_t *const dict, const uint8_t flags,
+AK_FORCE_INLINE int BinaryFormat::skipBigrams(const uint8_t *const dict, const uint8_t flags,
         const int pos) {
     if (FLAG_HAS_BIGRAMS & flags) {
         return skipExistingBigrams(dict, pos);
@@ -273,7 +275,7 @@ inline int BinaryFormat::skipBigrams(const uint8_t *const dict, const uint8_t fl
     }
 }
 
-inline int BinaryFormat::skipAllAttributes(const uint8_t *const dict, const uint8_t flags,
+AK_FORCE_INLINE int BinaryFormat::skipAllAttributes(const uint8_t *const dict, const uint8_t flags,
         const int pos) {
     // This function skips all attributes: shortcuts and bigrams.
     int newPos = pos;
@@ -282,7 +284,7 @@ inline int BinaryFormat::skipAllAttributes(const uint8_t *const dict, const uint
     return newPos;
 }
 
-inline int BinaryFormat::skipChildrenPosAndAttributes(const uint8_t *const dict,
+AK_FORCE_INLINE int BinaryFormat::skipChildrenPosAndAttributes(const uint8_t *const dict,
         const uint8_t flags, const int pos) {
     int currentPos = pos;
     currentPos = skipChildrenPosition(flags, currentPos);
@@ -290,8 +292,8 @@ inline int BinaryFormat::skipChildrenPosAndAttributes(const uint8_t *const dict,
     return currentPos;
 }
 
-inline int BinaryFormat::readChildrenPosition(const uint8_t *const dict, const uint8_t flags,
-        const int pos) {
+AK_FORCE_INLINE int BinaryFormat::readChildrenPosition(const uint8_t *const dict,
+        const uint8_t flags, const int pos) {
     int offset = 0;
     switch (MASK_GROUP_ADDRESS_TYPE & flags) {
         case FLAG_GROUP_ADDRESS_TYPE_ONEBYTE:
@@ -318,7 +320,7 @@ inline bool BinaryFormat::hasChildrenInFlags(const uint8_t flags) {
     return (FLAG_GROUP_ADDRESS_TYPE_NOADDRESS != (MASK_GROUP_ADDRESS_TYPE & flags));
 }
 
-inline int BinaryFormat::getAttributeAddressAndForwardPointer(const uint8_t *const dict,
+AK_FORCE_INLINE int BinaryFormat::getAttributeAddressAndForwardPointer(const uint8_t *const dict,
         const uint8_t flags, int *pos) {
     int offset = 0;
     const int origin = *pos;
@@ -352,8 +354,8 @@ inline int BinaryFormat::getAttributeFrequencyFromFlags(const int flags) {
 
 // This function gets the byte position of the last chargroup of the exact matching word in the
 // dictionary. If no match is found, it returns NOT_VALID_WORD.
-inline int BinaryFormat::getTerminalPosition(const uint8_t *const root, const int *const inWord,
-        const int length, const bool forceLowerCaseSearch) {
+AK_FORCE_INLINE int BinaryFormat::getTerminalPosition(const uint8_t *const root,
+        const int *const inWord, const int length, const bool forceLowerCaseSearch) {
     int pos = 0;
     int wordPos = 0;
 
@@ -438,7 +440,7 @@ inline int BinaryFormat::getTerminalPosition(const uint8_t *const root, const in
  * outUnigramFrequency: a pointer to an int to write the frequency into.
  * Return value : the length of the word, of 0 if the word was not found.
  */
-inline int BinaryFormat::getWordAtAddress(const uint8_t *const root, const int address,
+AK_FORCE_INLINE int BinaryFormat::getWordAtAddress(const uint8_t *const root, const int address,
         const int maxDepth, int *outWord, int *outUnigramFrequency) {
     int pos = 0;
     int wordPos = 0;
diff --git a/native/jni/src/correction.h b/native/jni/src/correction.h
index 105a95f38..912cd838e 100644
--- a/native/jni/src/correction.h
+++ b/native/jni/src/correction.h
@@ -56,7 +56,8 @@ class Correction {
         // No need to initialize it explicitly here.
     }
 
-    virtual ~Correction() {}
+    // Non virtual inline destructor -- never inherit this class
+    ~Correction() {}
     void resetCorrection();
     void initCorrection(
             const ProximityInfo *pi, const int inputSize, const int maxWordLength);
diff --git a/native/jni/src/geometry_utils.h b/native/jni/src/geometry_utils.h
index 927b44f96..38b91cc50 100644
--- a/native/jni/src/geometry_utils.h
+++ b/native/jni/src/geometry_utils.h
@@ -19,6 +19,8 @@
 
 #include <cmath>
 
+#include "defines.h"
+
 #define DEBUG_DECODER false
 
 #define M_PI_F 3.14159265f
@@ -44,19 +46,19 @@ static inline float getDistanceFloat(const float x1, const float y1, const float
     return hypotf(x1 - x2, y1 - y2);
 }
 
-static inline int getDistanceInt(const int x1, const int y1, const int x2, const int y2) {
+static AK_FORCE_INLINE int getDistanceInt(const int x1, const int y1, const int x2, const int y2) {
     return static_cast<int>(getDistanceFloat(static_cast<float>(x1), static_cast<float>(y1),
             static_cast<float>(x2), static_cast<float>(y2)));
 }
 
-static inline float getAngle(const int x1, const int y1, const int x2, const int y2) {
+static AK_FORCE_INLINE float getAngle(const int x1, const int y1, const int x2, const int y2) {
     const int dx = x1 - x2;
     const int dy = y1 - y2;
     if (dx == 0 && dy == 0) return 0;
     return atan2f(static_cast<float>(dy), static_cast<float>(dx));
 }
 
-static inline float getAngleDiff(const float a1, const float a2) {
+static AK_FORCE_INLINE float getAngleDiff(const float a1, const float a2) {
     const float deltaA = fabsf(a1 - a2);
     const float diff = ROUND_FLOAT_10000(deltaA);
     if (diff > M_PI_F) {
diff --git a/native/jni/src/gesture/gesture_decoder_wrapper.cpp b/native/jni/src/gesture/gesture_decoder_wrapper.cpp
index afbe0c5c3..20ad4a58c 100644
--- a/native/jni/src/gesture/gesture_decoder_wrapper.cpp
+++ b/native/jni/src/gesture/gesture_decoder_wrapper.cpp
@@ -19,4 +19,8 @@
 namespace latinime {
     IncrementalDecoderInterface *
             (*GestureDecoderWrapper::sGestureDecoderFactoryMethod)(int, int) = 0;
+
+    GestureDecoderWrapper::~GestureDecoderWrapper() {
+        delete mIncrementalDecoderInterface;
+    }
 } // namespace latinime
diff --git a/native/jni/src/gesture/gesture_decoder_wrapper.h b/native/jni/src/gesture/gesture_decoder_wrapper.h
index eb80bd2e2..5b056b647 100644
--- a/native/jni/src/gesture/gesture_decoder_wrapper.h
+++ b/native/jni/src/gesture/gesture_decoder_wrapper.h
@@ -33,9 +33,7 @@ class GestureDecoderWrapper : public IncrementalDecoderInterface {
             : mIncrementalDecoderInterface(getGestureDecoderInstance(maxWordLength, maxWords)) {
     }
 
-    virtual ~GestureDecoderWrapper() {
-        delete mIncrementalDecoderInterface;
-    }
+    virtual ~GestureDecoderWrapper();
 
     int getSuggestions(ProximityInfo *pInfo, void *traverseSession, int *inputXs, int *inputYs,
             int *times, int *pointerIds, int *codes, int inputSize, int commitPoint, int *outWords,
diff --git a/native/jni/src/gesture/incremental_decoder_wrapper.cpp b/native/jni/src/gesture/incremental_decoder_wrapper.cpp
index 8fcda6c9e..f6e45623a 100644
--- a/native/jni/src/gesture/incremental_decoder_wrapper.cpp
+++ b/native/jni/src/gesture/incremental_decoder_wrapper.cpp
@@ -19,4 +19,8 @@
 namespace latinime {
     IncrementalDecoderInterface *
             (*IncrementalDecoderWrapper::sIncrementalDecoderFactoryMethod)(int, int) = 0;
+
+    IncrementalDecoderWrapper::~IncrementalDecoderWrapper() {
+        delete mIncrementalDecoderInterface;
+    }
 } // namespace latinime
diff --git a/native/jni/src/gesture/incremental_decoder_wrapper.h b/native/jni/src/gesture/incremental_decoder_wrapper.h
index 691d4952d..7d16560ef 100644
--- a/native/jni/src/gesture/incremental_decoder_wrapper.h
+++ b/native/jni/src/gesture/incremental_decoder_wrapper.h
@@ -33,9 +33,7 @@ class IncrementalDecoderWrapper : public IncrementalDecoderInterface {
             : mIncrementalDecoderInterface(getIncrementalDecoderInstance(maxWordLength, maxWords)) {
     }
 
-    virtual ~IncrementalDecoderWrapper() {
-        delete mIncrementalDecoderInterface;
-    }
+    virtual ~IncrementalDecoderWrapper();
 
     int getSuggestions(ProximityInfo *pInfo, void *traverseSession, int *inputXs, int *inputYs,
             int *times, int *pointerIds, int *codes, int inputSize, int commitPoint, int *outWords,
diff --git a/native/jni/src/proximity_info.cpp b/native/jni/src/proximity_info.cpp
index a12d43acc..84db7c196 100644
--- a/native/jni/src/proximity_info.cpp
+++ b/native/jni/src/proximity_info.cpp
@@ -31,8 +31,8 @@ namespace latinime {
 
 /* static */ const float ProximityInfo::NOT_A_DISTANCE_FLOAT = -1.0f;
 
-static inline void safeGetOrFillZeroIntArrayRegion(JNIEnv *env, jintArray jArray, jsize len,
-        jint *buffer) {
+static AK_FORCE_INLINE void safeGetOrFillZeroIntArrayRegion(JNIEnv *env, jintArray jArray,
+        jsize len, jint *buffer) {
     if (jArray && buffer) {
         env->GetIntArrayRegion(jArray, 0, len, buffer);
     } else if (buffer) {
@@ -40,8 +40,8 @@ static inline void safeGetOrFillZeroIntArrayRegion(JNIEnv *env, jintArray jArray
     }
 }
 
-static inline void safeGetOrFillZeroFloatArrayRegion(JNIEnv *env, jfloatArray jArray, jsize len,
-        jfloat *buffer) {
+static AK_FORCE_INLINE void safeGetOrFillZeroFloatArrayRegion(JNIEnv *env, jfloatArray jArray,
+        jsize len, jfloat *buffer) {
     if (jArray && buffer) {
         env->GetFloatArrayRegion(jArray, 0, len, buffer);
     } else if (buffer) {
diff --git a/native/jni/src/proximity_info_state.h b/native/jni/src/proximity_info_state.h
index 9b859606d..39a238889 100644
--- a/native/jni/src/proximity_info_state.h
+++ b/native/jni/src/proximity_info_state.h
@@ -50,7 +50,7 @@ class ProximityInfoState {
     /////////////////////////////////////////
     // Defined here                        //
     /////////////////////////////////////////
-    ProximityInfoState()
+    AK_FORCE_INLINE ProximityInfoState()
             : mProximityInfo(0), mMaxPointToKeyLength(0),
               mHasTouchPositionCorrectionData(false), mMostCommonKeyWidthSquare(0), mLocaleStr(),
               mKeyCount(0), mCellHeight(0), mCellWidth(0), mGridHeight(0), mGridWidth(0),
@@ -63,13 +63,14 @@ class ProximityInfoState {
         memset(mPrimaryInputWord, 0, sizeof(mPrimaryInputWord));
     }
 
-    virtual ~ProximityInfoState() {}
+    // Non virtual inline destructor -- never inherit this class
+    AK_FORCE_INLINE ~ProximityInfoState() {}
 
     inline int getPrimaryCodePointAt(const int index) const {
         return getProximityCodePointsAt(index)[0];
     }
 
-    inline bool existsCodePointInProximityAt(const int index, const int c) const {
+    AK_FORCE_INLINE bool existsCodePointInProximityAt(const int index, const int c) const {
         const int *codePoints = getProximityCodePointsAt(index);
         int i = 0;
         while (codePoints[i] > 0 && i < MAX_PROXIMITY_CHARS_SIZE_INTERNAL) {
diff --git a/native/jni/src/words_priority_queue.h b/native/jni/src/words_priority_queue.h
index b0cc92e2f..7d0c4d17d 100644
--- a/native/jni/src/words_priority_queue.h
+++ b/native/jni/src/words_priority_queue.h
@@ -53,7 +53,8 @@ class WordsPriorityQueue {
         }
     }
 
-    virtual ~WordsPriorityQueue() {
+    // Non virtual inline destructor -- never inherit this class
+    AK_FORCE_INLINE ~WordsPriorityQueue() {
         delete[] mSuggestedWords;
     }
 
@@ -98,7 +99,7 @@ class WordsPriorityQueue {
         return static_cast<int>(mSuggestions.size());
     }
 
-    void clear() {
+    AK_FORCE_INLINE void clear() {
         mHighestSuggestedWord = 0;
         while (!mSuggestions.empty()) {
             SuggestedWord *sw = mSuggestions.top();
diff --git a/native/jni/src/words_priority_queue_pool.h b/native/jni/src/words_priority_queue_pool.h
index 2d52903e0..c14afa07b 100644
--- a/native/jni/src/words_priority_queue_pool.h
+++ b/native/jni/src/words_priority_queue_pool.h
@@ -36,7 +36,8 @@ class WordsPriorityQueuePool {
         }
     }
 
-    virtual ~WordsPriorityQueuePool() {
+    // Non virtual inline destructor -- never inherit this class
+    ~WordsPriorityQueuePool() {
         // Note: these explicit calls to the destructor match the calls to placement new() above.
         if (mMasterQueue) mMasterQueue->~WordsPriorityQueue();
         for (int i = 0; i < MULTIPLE_WORDS_SUGGESTION_MAX_WORDS * SUB_QUEUE_MAX_COUNT; ++i) {
@@ -68,7 +69,7 @@ class WordsPriorityQueuePool {
         }
     }
 
-    inline void clearSubQueue(const int wordIndex) {
+    AK_FORCE_INLINE void clearSubQueue(const int wordIndex) {
         for (int i = 0; i < SUB_QUEUE_MAX_COUNT; ++i) {
             WordsPriorityQueue *queue = getSubQueue(wordIndex, i);
             if (queue) {