RFR: JDK-8175795 configure should verify that system zlib contains needed functionality

[Erik Joelsson]

Looks good.

/Erik


On 2017-12-04 03:30, Magnus Ihse Bursie wrote:
> On 2017-12-04 12:14, Magnus Ihse Bursie wrote:
>> I retract this review for now. The issue turned out to be not so 
>> simple as this. We *are* able to build with older versions of zlib. 
>> The dependency for inflateValidate arises from the bundled libpng; a 
>> system libpng does not necessary have that issue.
> Actually, the bundled libpng makes a version check for zlib... So it 
> *should* work even with older zlibs. Probably the reporter of the bug 
> had run into an issue with a zlib clone like zlib-ng, e.g. 
> https://github.com/Dead2/zlib-ng/issues/80.
>
> Normally, I don't think it's worth adding checks to configure for 
> every possible broken package there is out there. But since someone 
> actually ran into this (and I've already written most of the patch), 
> here's an updated version:
>
> http://cr.openjdk.java.net/~ihse/JDK-8175795-check-for-system-zlib-functionality/webrev.02 
>
>
> /Magnus
>
>>
>> /Magnus
>>
>> On 2017-12-04 11:57, Magnus Ihse Bursie wrote:
>>> If we're using the system zlib instead of the bundled zlib, we 
>>> should verify that it includes all relevant functions. We now rely 
>>> on the inflateValidate() function, which was introduced in zlib 
>>> 1.2.9 which is very recent. This patch adds a test to the system 
>>> zlib to verify this and to fail fast in case it's too old.
>>>
>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8175795
>>> WebRev: 
>>> http://cr.openjdk.java.net/~ihse/JDK-8175795-check-for-system-zlib-functionality/webrev.01
>>>
>>> /Magnus
>>>
>>
>