diff --git a/apps/aomdec.c b/apps/aomdec.c
index 333478a..1efc091 100644
--- a/apps/aomdec.c
+++ b/apps/aomdec.c
@@ -381,7 +381,7 @@
         case '7': snprintf(q, q_len - 1, "%07d", frame_in); break;
         case '8': snprintf(q, q_len - 1, "%08d", frame_in); break;
         case '9': snprintf(q, q_len - 1, "%09d", frame_in); break;
-        default: die("Unrecognized pattern %%%c\n", p[1]); break;
+        default: die("Unrecognized pattern %%%c\n", p[1]);
       }
 
       pat_len = strlen(q);
diff --git a/av1/common/reconinter.c b/av1/common/reconinter.c
index 5e19e58..602fab7 100644
--- a/av1/common/reconinter.c
+++ b/av1/common/reconinter.c
@@ -819,11 +819,11 @@
 #if DISABLE_CHROMA_U8X8_OBMC
     case BLOCK_4X4:
     case BLOCK_8X4:
-    case BLOCK_4X8: return 1; break;
+    case BLOCK_4X8: return 1;
 #else
     case BLOCK_4X4:
     case BLOCK_8X4:
-    case BLOCK_4X8: return dir == 0; break;
+    case BLOCK_4X8: return dir == 0;
 #endif
     default: return 0;
   }
@@ -832,8 +832,6 @@
 void av1_modify_neighbor_predictor_for_obmc(MB_MODE_INFO *mbmi) {
   mbmi->ref_frame[1] = NONE_FRAME;
   mbmi->interinter_comp.type = COMPOUND_AVERAGE;
-
-  return;
 }
 
 struct obmc_inter_pred_ctxt {
diff --git a/av1/encoder/arm/neon/highbd_fwd_txfm_neon.c b/av1/encoder/arm/neon/highbd_fwd_txfm_neon.c
index 0549a48..64e4dae 100644
--- a/av1/encoder/arm/neon/highbd_fwd_txfm_neon.c
+++ b/av1/encoder/arm/neon/highbd_fwd_txfm_neon.c
@@ -3886,9 +3886,9 @@
 
 static INLINE TxfmFuncNEON fwd_txfm_type_to_func(TXFM_TYPE txfm_type) {
   switch (txfm_type) {
-    case TXFM_TYPE_DCT32: return fdct32_new_neon; break;
-    case TXFM_TYPE_DCT64: return fdct64_new_neon; break;
-    case TXFM_TYPE_IDENTITY32: return idtx32x32_neon; break;
+    case TXFM_TYPE_DCT32: return fdct32_new_neon;
+    case TXFM_TYPE_DCT64: return fdct64_new_neon;
+    case TXFM_TYPE_IDENTITY32: return idtx32x32_neon;
     default: assert(0);
   }
   return NULL;
diff --git a/av1/encoder/encodeframe.c b/av1/encoder/encodeframe.c
index e5e9b75..50f046d 100644
--- a/av1/encoder/encodeframe.c
+++ b/av1/encoder/encodeframe.c
@@ -611,7 +611,7 @@
       }
 
       // TODO(jingning): revisit this function.
-      if (cpi->oxcf.algo_cfg.enable_tpl_model && 0) {
+      if (cpi->oxcf.algo_cfg.enable_tpl_model && (0)) {
         adjust_rdmult_tpl_model(cpi, x, mi_row, mi_col);
       }
     }
diff --git a/av1/encoder/firstpass.c b/av1/encoder/firstpass.c
index c0d658b..cb4a580 100644
--- a/av1/encoder/firstpass.c
+++ b/av1/encoder/firstpass.c
@@ -221,7 +221,6 @@
         case BLOCK_8X16: return aom_highbd_8_mse8x16;
         default: return aom_highbd_8_mse16x16;
       }
-      break;
     case 10:
       switch (bsize) {
         case BLOCK_8X8: return aom_highbd_10_mse8x8;
@@ -229,7 +228,6 @@
         case BLOCK_8X16: return aom_highbd_10_mse8x16;
         default: return aom_highbd_10_mse16x16;
       }
-      break;
     case 12:
       switch (bsize) {
         case BLOCK_8X8: return aom_highbd_12_mse8x8;
@@ -237,7 +235,6 @@
         case BLOCK_8X16: return aom_highbd_12_mse8x16;
         default: return aom_highbd_12_mse16x16;
       }
-      break;
   }
 }
 
diff --git a/av1/encoder/x86/av1_fwd_txfm2d_sse4.c b/av1/encoder/x86/av1_fwd_txfm2d_sse4.c
index e23f38d..825da8d 100644
--- a/av1/encoder/x86/av1_fwd_txfm2d_sse4.c
+++ b/av1/encoder/x86/av1_fwd_txfm2d_sse4.c
@@ -75,9 +75,9 @@
 
 static INLINE TxfmFuncSSE2 fwd_txfm_type_to_func(TXFM_TYPE txfm_type) {
   switch (txfm_type) {
-    case TXFM_TYPE_DCT32: return fdct32_sse4_1; break;
-    case TXFM_TYPE_DCT64: return fdct64_new_sse4_1; break;
-    case TXFM_TYPE_IDENTITY32: return idtx32x32_sse4_1; break;
+    case TXFM_TYPE_DCT32: return fdct32_sse4_1;
+    case TXFM_TYPE_DCT64: return fdct64_new_sse4_1;
+    case TXFM_TYPE_IDENTITY32: return idtx32x32_sse4_1;
     default: assert(0);
   }
   return NULL;
diff --git a/build/cmake/aom_configure.cmake b/build/cmake/aom_configure.cmake
index ebf8a81..ad33f9a 100644
--- a/build/cmake/aom_configure.cmake
+++ b/build/cmake/aom_configure.cmake
@@ -349,6 +349,7 @@
   add_compiler_flag_if_supported("-Wstring-conversion")
   add_compiler_flag_if_supported("-Wtype-limits")
   add_compiler_flag_if_supported("-Wuninitialized")
+  add_compiler_flag_if_supported("-Wunreachable-code-aggressive")
   add_compiler_flag_if_supported("-Wunused")
   add_compiler_flag_if_supported("-Wvla")
   add_cxx_flag_if_supported("-Wc++14-extensions")
diff --git a/common/tools_common.c b/common/tools_common.c
index 114e635..afe4619 100644
--- a/common/tools_common.c
+++ b/common/tools_common.c
@@ -309,7 +309,7 @@
     case AOM_IMG_FMT_I42016:
     case AOM_IMG_FMT_I42216:
     case AOM_IMG_FMT_I44416: break;
-    default: fatal("Unsupported image conversion"); break;
+    default: fatal("Unsupported image conversion");
   }
   for (plane = 0; plane < 3; plane++) {
     int w = src->d_w;
@@ -345,7 +345,7 @@
     case AOM_IMG_FMT_I420:
     case AOM_IMG_FMT_I422:
     case AOM_IMG_FMT_I444: break;
-    default: fatal("Unsupported image conversion"); break;
+    default: fatal("Unsupported image conversion");
   }
   for (plane = 0; plane < 3; plane++) {
     int w = src->d_w;
@@ -386,7 +386,7 @@
     case AOM_IMG_FMT_I420:
     case AOM_IMG_FMT_I422:
     case AOM_IMG_FMT_I444: break;
-    default: fatal("Unsupported image conversion"); break;
+    default: fatal("Unsupported image conversion");
   }
   for (plane = 0; plane < 3; plane++) {
     int w = src->d_w;
@@ -420,7 +420,7 @@
     case AOM_IMG_FMT_I42016:
     case AOM_IMG_FMT_I42216:
     case AOM_IMG_FMT_I44416: break;
-    default: fatal("Unsupported image conversion"); break;
+    default: fatal("Unsupported image conversion");
   }
   for (plane = 0; plane < 3; plane++) {
     int w = src->d_w;
@@ -453,7 +453,7 @@
     case AOM_IMG_FMT_I420:
     case AOM_IMG_FMT_I422:
     case AOM_IMG_FMT_I444: break;
-    default: fatal("Unsupported image conversion"); break;
+    default: fatal("Unsupported image conversion");
   }
   for (plane = 0; plane < 3; plane++) {
     int w = src->d_w;
diff --git a/examples/inspect.c b/examples/inspect.c
index 8e7213a..ed77b5d 100644
--- a/examples/inspect.c
+++ b/examples/inspect.c
@@ -509,7 +509,6 @@
   int r, c, t, i;
   if (compress && len == 1) {
     die("Can't encode scalars as arrays when RLE compression is enabled.");
-    return -1;
   }
   if (map) {
     buf += snprintf(buf, MAX_BUFFER, "  \"%sMap\": {", name);
diff --git a/examples/lightfield_bitstream_parsing.c b/examples/lightfield_bitstream_parsing.c
index 66e9993..05272ba 100644
--- a/examples/lightfield_bitstream_parsing.c
+++ b/examples/lightfield_bitstream_parsing.c
@@ -92,7 +92,6 @@
     case AOM_IMG_FMT_I44416: return 48;
     default: die("Invalid image format");
   }
-  return 0;
 }
 
 static void process_tile_list(const TILE_LIST_INFO *tiles, int num_tiles,
diff --git a/examples/svc_encoder_rtc.c b/examples/svc_encoder_rtc.c
index 77a123c..387f08e 100644
--- a/examples/svc_encoder_rtc.c
+++ b/examples/svc_encoder_rtc.c
@@ -347,7 +347,6 @@
           break;
         default:
           die("Error: Invalid bit depth selected (%d)\n", enc_cfg->g_bit_depth);
-          break;
       }
 #endif  // CONFIG_VP9_HIGHBITDEPTH
     } else if (arg_match(&arg, &dropframe_thresh_arg, argi)) {
diff --git a/test/noise_model_test.cc b/test/noise_model_test.cc
index e9cf9e2..c169117 100644
--- a/test/noise_model_test.cc
+++ b/test/noise_model_test.cc
@@ -36,7 +36,6 @@
       return sigma * (u * sqrt(-2.0 * log(s) / s));
     }
   }
-  return 0;
 }
 
 // Synthesizes noise using the auto-regressive filter of the given lag,