RFR: JDK-8031767 Support system or alternative implementations of zlib

[Seán Coffey]

Is there an option to fall back to the older v.1.2.8 implementation if 
necessary ? It would certainly alleviate issues for any applications 
that might run into issues with the latest and greatest zlib libraries. 
JDK-8133206 would be one such example.

Regards,
Sean.

On 05/02/2016 18:55, Xueming Shen wrote:
> Hi
>
> Please help codereview the change to build the jdk9 runtime to use the 
> system zlib on
> Solaris and Linux platforms by default.
>
> Issue: https://bugs.openjdk.java.net/browse/JDK-8031767
> Webrev: http://cr.openjdk.java.net/~sherman/8031767/webrev/
>
> Background info:
>
> Compression is heavily used in Java based big data/middle-ware 
> applications.
> There are many products in market today that help compression performance
> either through software or hardware acceleration and most likely these 
> products
> support the zlib interface as API, for example Intel's IPP library has 
> a faster
> version of compression libraries. To configure the Java runtime to use 
> the system
> zlib would make these acceleration capabilities available to java 
> users through
> java.util.zip package directly. The jdk already has a build 
> configuration option
> to build the jdk to use the system zlib via "--with-zlib=system" and 
> the OSX is
> by default built to use the system zlib. This proposal is to propose 
> to build
> the jdk to use the system zlib library (the zlib bundled by the 
> underlying Solaris/
> Linuxplatforms), instead of the binary  built from source code jdk 
> repository
> (current 1.2.8 from the open source zlib.org)
>
> Thanks,
> Sherman
>
>
> btw, attached is the similar change in the closed repo: 
> autoconf/generated-configure.sh
> -------------------------------------------------------------
>
> # Do not change or remove the following line, it is needed for 
> consistency checks:
> -DATE_WHEN_GENERATED=1454436146
> +DATE_WHEN_GENERATED=1454626552
>
>  ############################################################################### 
>
>  #
>  # Initialization / Boot-strapping
>  #
>
> ------------------------------------------------------------------------
>
> @@ -58839,14 +58839,14 @@
>
>
>    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for which zlib to 
> use" >&5
>  $as_echo_n "checking for which zlib to use... " >&6; }
>
> - DEFAULT_ZLIB=bundled
> - if test "x$OPENJDK_TARGET_OS" = xmacosx; then
> - # On macosx default is system...on others default is bundled
>      DEFAULT_ZLIB=system
> + if test "x$OPENJDK_TARGET_OS" = xwindows; then
> + # On windows default is bundled...on others default is system
> + DEFAULT_ZLIB=bundled
>    fi
>
>    if test "x${ZLIB_FOUND}" != "xyes"; then
>      # If we don't find any system...set default to bundled
>      DEFAULT_ZLIB=bundled
>
>