Do not let internal JDK zlib symbols leak out of fastdebug libzip.so

[Xueming Shen]

Here is the bugid you will need.

8008759: Do not let internal JDK zlib symbols leak out of fastdebug libzip.so

On 02/22/2013 02:03 PM, Martin Buchholz wrote:
> Hi Alan, Xueming, build-ers,
>
> I'd like you to do a code review.
>
> I've finally figured out why fastdebug jdk occasionally gives InternalError in the zip code.
>
> Exception in thread "main" java.lang.InternalError
> at java.util.zip.Inflater.init(Native Method)
> at java.util.zip.Inflater.<init>(Inflater.java:101)
> at java.util.zip.ZipFile.getInflater(ZipFile.java:448)
>
> It's because:
> - jdk changed structure size of z_stream struct
> - making jdk zlib incompatible with stock zlib
> - as a result of which, it is imperative to keep jdk zlib sequestered from system zlib
> - so need to not export zlib symbols from libzip.so
> - so need to tell makefiles to use linker script unconditionally
>
> http://cr.openjdk.java.net/~martin/webrevs/openjdk8/hide-zlib/ <http://cr.openjdk.java.net/%7Emartin/webrevs/openjdk8/hide-zlib/>
>