--- a/src/jdk.pack/share/native/common-unpack/zip.cpp	Mon Jun 11 22:35:07 2018 -0400
+++ b/src/jdk.pack/share/native/common-unpack/zip.cpp	Tue Jun 12 14:16:41 2018 +0530
@@ -533,6 +533,8 @@
   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;
@@ -579,8 +581,8 @@
         fseek(u->infileptr, -TRAILER_LEN, SEEK_END);
         uint filecrc;
         uint filelen;
-        fread(&filecrc, sizeof(filecrc), 1, u->infileptr);
-        fread(&filelen, sizeof(filelen), 1, u->infileptr);
+        ret = fread(&filecrc, sizeof(filecrc), 1, u->infileptr);
+        ret = fread(&filelen, sizeof(filelen), 1, u->infileptr);
         filecrc = SWAP_INT(filecrc);
         filelen = SWAP_INT(filelen);
         if (u->gzin->gzcrc != filecrc ||