From c346e3bc8bc8e8c844a0d53686c8c3cae315deaa Mon Sep 17 00:00:00 2001
From: Ben Taylor <benty@amazon.com>
Date: Thu, 5 Jan 2023 16:35:54 -0800
Subject: [PATCH] Disable implicit-fallthrough warnings on gcc7 or higher when
 building the bundled version of zlib.

---
 .../share/native/libzip/zlib/infback.c         |  2 +-
 .../share/native/libzip/zlib/inflate.c         | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/java.base/share/native/libzip/zlib/infback.c b/src/java.base/share/native/libzip/zlib/infback.c
index 4c8283909c1..1a9cc6b6013 100644
--- a/src/java.base/share/native/libzip/zlib/infback.c
+++ b/src/java.base/share/native/libzip/zlib/infback.c
@@ -501,7 +501,7 @@ void FAR *out_desc;
             }
             Tracev((stderr, "inflate:       codes ok\n"));
             state->mode = LEN;
-
+            /* FALLTHROUGH */
         case LEN:
             /* use inflate_fast() if we have enough input and output */
             if (have >= 6 && left >= 258) {
diff --git a/src/java.base/share/native/libzip/zlib/inflate.c b/src/java.base/share/native/libzip/zlib/inflate.c
index ca904e74427..4abfe84a5d3 100644
--- a/src/java.base/share/native/libzip/zlib/inflate.c
+++ b/src/java.base/share/native/libzip/zlib/inflate.c
@@ -764,6 +764,7 @@ int flush;
                 CRC2(state->check, hold);
             INITBITS();
             state->mode = EXLEN;
+            /* FALLTHROUGH */
         case EXLEN:
             if (state->flags & 0x0400) {
                 NEEDBITS(16);
@@ -777,6 +778,7 @@ int flush;
             else if (state->head != Z_NULL)
                 state->head->extra = Z_NULL;
             state->mode = EXTRA;
+            /* FALLTHROUGH */
         case EXTRA:
             if (state->flags & 0x0400) {
                 copy = state->length;
@@ -799,6 +801,7 @@ int flush;
             }
             state->length = 0;
             state->mode = NAME;
+            /* FALLTHROUGH */
         case NAME:
             if (state->flags & 0x0800) {
                 if (have == 0) goto inf_leave;
@@ -820,6 +823,7 @@ int flush;
                 state->head->name = Z_NULL;
             state->length = 0;
             state->mode = COMMENT;
+            /* FALLTHROUGH */
         case COMMENT:
             if (state->flags & 0x1000) {
                 if (have == 0) goto inf_leave;
@@ -840,6 +844,7 @@ int flush;
             else if (state->head != Z_NULL)
                 state->head->comment = Z_NULL;
             state->mode = HCRC;
+            /* FALLTHROUGH */
         case HCRC:
             if (state->flags & 0x0200) {
                 NEEDBITS(16);
@@ -863,6 +868,7 @@ int flush;
             strm->adler = state->check = ZSWAP32(hold);
             INITBITS();
             state->mode = DICT;
+            /* FALLTHROUGH */
         case DICT:
             if (state->havedict == 0) {
                 RESTORE();
@@ -870,8 +876,10 @@ int flush;
             }
             strm->adler = state->check = adler32(0L, Z_NULL, 0);
             state->mode = TYPE;
+            /* FALLTHROUGH */
         case TYPE:
             if (flush == Z_BLOCK || flush == Z_TREES) goto inf_leave;
+            /* FALLTHROUGH */
         case TYPEDO:
             if (state->last) {
                 BYTEBITS();
@@ -922,8 +930,10 @@ int flush;
             INITBITS();
             state->mode = COPY_;
             if (flush == Z_TREES) goto inf_leave;
+            /* FALLTHROUGH */
         case COPY_:
             state->mode = COPY;
+            /* FALLTHROUGH */
         case COPY:
             copy = state->length;
             if (copy) {
@@ -1063,8 +1073,10 @@ int flush;
             Tracev((stderr, "inflate:       codes ok\n"));
             state->mode = LEN_;
             if (flush == Z_TREES) goto inf_leave;
+            /* FALLTHROUGH */
         case LEN_:
             state->mode = LEN;
+            /* FALLTHROUGH */
         case LEN:
             if (have >= 6 && left >= 258) {
                 RESTORE();
@@ -1114,6 +1126,7 @@ int flush;
             }
             state->extra = (unsigned)(here.op) & 15;
             state->mode = LENEXT;
+            /* FALLTHROUGH */
         case LENEXT:
             if (state->extra) {
                 NEEDBITS(state->extra);
@@ -1124,6 +1137,7 @@ int flush;
             Tracevv((stderr, "inflate:         length %u\n", state->length));
             state->was = state->length;
             state->mode = DIST;
+            /* FALLTHROUGH */
         case DIST:
             for (;;) {
                 here = state->distcode[BITS(state->distbits)];
@@ -1151,6 +1165,7 @@ int flush;
             state->offset = (unsigned)here.val;
             state->extra = (unsigned)(here.op) & 15;
             state->mode = DISTEXT;
+            /* FALLTHROUGH */
         case DISTEXT:
             if (state->extra) {
                 NEEDBITS(state->extra);
@@ -1167,6 +1182,7 @@ int flush;
 #endif
             Tracevv((stderr, "inflate:         distance %u\n", state->offset));
             state->mode = MATCH;
+            /* FALLTHROUGH */
         case MATCH:
             if (left == 0) goto inf_leave;
             copy = out - left;
@@ -1242,6 +1258,7 @@ int flush;
             }
 #ifdef GUNZIP
             state->mode = LENGTH;
+            /* FALLTHROUGH */
         case LENGTH:
             if (state->wrap && state->flags) {
                 NEEDBITS(32);
@@ -1255,6 +1272,7 @@ int flush;
             }
 #endif
             state->mode = DONE;
+            /* FALLTHROUGH */
         case DONE:
             ret = Z_STREAM_END;
             goto inf_leave;
-- 
2.39.0