src/jdk.pack/share/native/common-unpack/zip.cpp

@@ -531,10 +531,12 @@
   assert(minlen <= maxlen);  // don't talk nonsense
   jlong numread = 0;
   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;
   while (numread < minlen) {
     int readlen = (1 << 16);  // pretty arbitrary

@@ -577,12 +579,12 @@
       if (u->gzin->gzcrc != 0) {
         // Read the CRC information from the gzip container
         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 ||
                 // rfc1952; ISIZE is the input size modulo 2^32
                 u->gzin->gzlen != (filelen & 0xffffffff)) { // CRC error