Index: common/lib/libc/misc/ubsan.c
===================================================================
RCS file: /cvsroot/src/common/lib/libc/misc/ubsan.c,v
retrieving revision 1.4
diff -u -r1.4 ubsan.c
--- common/lib/libc/misc/ubsan.c	4 Feb 2019 22:07:41 -0000	1.4
+++ common/lib/libc/misc/ubsan.c	13 Feb 2019 17:05:41 -0000
@@ -110,7 +110,7 @@
 
 #define NUMBER_SIGNED_BIT	1U
 
-#if __SIZEOF_INT128__
+#ifdef __SIZEOF_INT128__
 typedef __int128 longest;
 typedef unsigned __int128 ulongest;
 #else
@@ -1192,6 +1192,7 @@
 	}
 	if (isFatal || ISSET(ubsan_flags, UBSAN_ABORT)) {
 		abort();
+		__unreachable();
 		/* NOTREACHED */
 	}
 #endif
@@ -1291,6 +1292,7 @@
 	switch (zDeserializeTypeWidth(pType)) {
 	default:
 		ASSERT(0 && "Invalid codepath");
+		__unreachable();
 		/* NOTREACHED */
 #ifdef __SIZEOF_INT128__
 	case WIDTH_128:
@@ -1298,8 +1300,11 @@
 		break;
 #endif
 	case WIDTH_64:
+		/* FALLTHROUGH */
 	case WIDTH_32:
+		/* FALLTHROUGH */
 	case WIDTH_16:
+		/* FALLTHROUGH */
 	case WIDTH_8:
 		snprintf(pBuffer, zBUfferLength, "%" PRId64, STATIC_CAST(int64_t, L));
 		break;
@@ -1318,6 +1323,7 @@
 	switch (zDeserializeTypeWidth(pType)) {
 	default:
 		ASSERT(0 && "Invalid codepath");
+		__unreachable();
 		/* NOTREACHED */
 #ifdef __SIZEOF_INT128__
 	case WIDTH_128:
@@ -1325,8 +1331,11 @@
 		break;
 #endif
 	case WIDTH_64:
+		/* FALLTHROUGH */
 	case WIDTH_32:
+		/* FALLTHROUGH */
 	case WIDTH_16:
+		/* FALLTHROUGH */
 	case WIDTH_8:
 		snprintf(pBuffer, zBUfferLength, "%" PRIu64, STATIC_CAST(uint64_t, L));
 		break;
@@ -1358,7 +1367,9 @@
 	switch (zDeserializeTypeWidth(pType)) {
 #ifdef __HAVE_LONG_DOUBLE
 	case WIDTH_128:
+		/* FALLTHROUGH */
 	case WIDTH_96:
+		/* FALLTHROUGH */
 	case WIDTH_80:
 		memcpy(&LD, pNumber, sizeof(long double));
 		snprintf(pBuffer, zBUfferLength, "%Lg", LD);
@@ -1512,7 +1523,9 @@
 		/* NOTREACHED */
 #ifdef __HAVE_LONG_DOUBLE
 	case WIDTH_128:
+		/* FALLTHROUGH */
 	case WIDTH_96:
+		/* FALLTHROUGH */
 	case WIDTH_80:
 		DeserializeFloatOverPointer(pBuffer, zBUfferLength, pType, REINTERPRET_CAST(unsigned long *, ulNumber));
 		break;
@@ -1524,6 +1537,7 @@
 		}
 		/* FALLTHROUGH */
 	case WIDTH_32:
+		/* FALLTHROUGH */
 	case WIDTH_16:
 		DeserializeFloatInlined(pBuffer, zBUfferLength, pType, ulNumber);
 		break;