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

[Florian Weimer]

On 02/22/2013 11:03 PM, Martin Buchholz wrote:

> I've finally figured out why fastdebug jdk occasionally gives InternalError
> in the zip code.

In the distant past, I also saw this with product builds.  Triggering 
conditions involved a JNI DSO calling dlopen(RTLD_GLOBAL) on another DSO 
which eventually triggered loading the system zlib.  This might still be 
relevant on stock OpenJDK 7.

IcedTea avoids this by linking against system zlib.

-- 
Florian Weimer / Red Hat Product Security Team