Use fallthrough attribute instead of comment as the comment no longer works in Clang 10.

vendor/newrelic/axiom/nr_axiom.h

@@ -80,6 +80,21 @@ NRINLINE void* nr_remove_const(const void* ptr) {
 
 #endif /* } */
 
+
+#if defined(__clang__)
+#if __has_attribute(fallthrough)
+#define FALLTHROUGH __attribute__((fallthrough));
+#else
+#define FALLTHROUGH
+#endif
+#else
+#if defined(__GNUC__) && __GNUC__ >= 7
+#define FALLTHROUGH __attribute__((fallthrough));
+#else
+#define FALLTHROUGH
+#endif /* __GNUC__ >= 7 */
+#endif
+
 /*
  * The macro nr_clang_assert is redefined to assert iff we are compiling using
  * the clang static analyzer scan-build.  scan-build is sensitive to

vendor/newrelic/axiom/util_hash.c

@@ -189,10 +189,10 @@ uint32_t nr_mkhash(const char* str, int* len) {
   switch (str_len & 3) {
     case 3:
       k1 ^= tail[2] << 16;
-      /* FALLTHROUGH */
+      FALLTHROUGH /* FALLTHROUGH */
     case 2:
       k1 ^= tail[1] << 8;
-      /* FALLTHROUGH */
+      FALLTHROUGH /* FALLTHROUGH */
     case 1:
       k1 ^= tail[0];
 

vendor/newrelic/axiom/util_object.c

@@ -1349,12 +1349,12 @@ static const char* parse_string(nrintobj_t* item, const char* str) {
             case 3:
               *--ptr2 = ((uc | 0x80) & 0xBF);
               uc >>= 6;
-              /*FALLTHROUGH*/
+              FALLTHROUGH /* FALLTHROUGH */
 
             case 2:
               *--ptr2 = ((uc | 0x80) & 0xBF);
               uc >>= 6;
-              /*FALLTHROUGH*/
+              FALLTHROUGH /* FALLTHROUGH */
 
             case 1:
               *--ptr2 = (uc | firstByteMark[len]);

vendor/newrelic/axiom/util_regex.c

@@ -328,7 +328,7 @@ void nr_regex_add_quoted_to_buffer(nrbuf_t* buf,
       case ':':
       case '-':
         nr_buffer_add(buf, NR_PSTR("\\"));
-        /* FALLTHROUGH */
+        FALLTHROUGH /* FALLTHROUGH */
 
       default:
         nr_buffer_add(buf, &str[i], 1);