diff --git a/make/launcher/Launcher-jdk.pack.gmk b/make/launcher/Launcher-jdk.pack.gmk
index 1f95b64cfa7..c7138f2ee99 100644
--- a/make/launcher/Launcher-jdk.pack.gmk
+++ b/make/launcher/Launcher-jdk.pack.gmk
@@ -90,6 +90,7 @@ $(eval $(call SetupJdkExecutable, BUILD_UNPACKEXE, \
     CFLAGS_linux := -fPIC, \
     CFLAGS_solaris := -KPIC, \
     CFLAGS_macosx := -fPIC, \
+    DISABLED_WARNINGS_gcc := unused-result implicit-fallthrough, \
     LDFLAGS := $(UNPACKEXE_ZIPOBJS) \
         $(LDFLAGS_JDKEXE) $(LDFLAGS_CXX_JDK) \
         $(call SET_SHARED_LIBRARY_ORIGIN), \
diff --git a/src/jdk.pack/share/native/common-unpack/unpack.cpp b/src/jdk.pack/share/native/common-unpack/unpack.cpp
index 3883efb4dea..8f7a09d1243 100644
--- a/src/jdk.pack/share/native/common-unpack/unpack.cpp
+++ b/src/jdk.pack/share/native/common-unpack/unpack.cpp
@@ -1799,7 +1799,6 @@ unpacker::attr_definitions::parseLayout(const char* lp, band** &res,
     case 'B': case 'H': case 'I': case 'V': // unsigned_int
     case 'S': // signed_int
       --lp; // reparse
-      /* fall through */
     case 'F':
       lp = parseIntLayout(lp, b, EK_INT);
       break;
diff --git a/src/jdk.pack/share/native/common-unpack/zip.cpp b/src/jdk.pack/share/native/common-unpack/zip.cpp
index 2003427a9de..f64740e91e3 100644
--- a/src/jdk.pack/share/native/common-unpack/zip.cpp
+++ b/src/jdk.pack/share/native/common-unpack/zip.cpp
@@ -533,8 +533,6 @@ static jlong read_input_via_gzip(unpacker* u,
   char* bufptr = (char*) buf;
   char* inbuf = u->gzin->inbuf;
   size_t inbuflen = sizeof(u->gzin->inbuf);
-  // capture return values from fread to avoid -Werror=unused-result issues
-  size_t ret = 0;
   unpacker::read_input_fn_t read_gzin_fn =
     (unpacker::read_input_fn_t) u->gzin->read_input_fn;
   z_stream& zs = *(z_stream*) u->gzin->zstream;
@@ -581,8 +579,8 @@ static jlong read_input_via_gzip(unpacker* u,
         fseek(u->infileptr, -TRAILER_LEN, SEEK_END);
         uint filecrc;
         uint filelen;
-        ret = fread(&filecrc, sizeof(filecrc), 1, u->infileptr);
-        ret = fread(&filelen, sizeof(filelen), 1, u->infileptr);
+        fread(&filecrc, sizeof(filecrc), 1, u->infileptr);
+        fread(&filelen, sizeof(filelen), 1, u->infileptr);
         filecrc = SWAP_INT(filecrc);
         filelen = SWAP_INT(filelen);
         if (u->gzin->gzcrc != filecrc ||