JDK 17: First Release Candidate

[David Holmes]

On 14/08/2021 7:23 pm, Florian Weimer wrote:
> * David Holmes:
> 
>> Hi Matthias,
>>
>> On 14/08/2021 2:00 am, Matthias Klose wrote:
>>> On 8/6/21 7:09 PM, mark.reinhold at oracle.com wrote:
>>>> There are no unresolved P1 bugs in build 35, so that is our
>>>> first JDK 17 Release Candidate.
>>>>
>>>> Binaries available here, as usual: https://jdk.java.net/17
>>> this fails to build with glibc 2.34, i.e. on recent Fedora and
>>> Ubuntu
>>> development versions:
>>> /<<PKGBUILDDIR>>/test/hotspot/jtreg/runtime/StackGuardPages/exeinvoke.c:
>>> In
>>> function 'set_signal_handler':
>>> /<<PKGBUILDDIR>>/test/hotspot/jtreg/runtime/StackGuardPages/exeinvoke.c:72:15:
>>> error: storage size of 'altstack' isn't constant
>>>      72 |   static char altstack[SIGSTKSZ];
>>>         |               ^~~~~~~~
>>> gmake[4]: *** [test/JtregNativeHotspot.gmk:1525:
>>> /<<PKGBUILDDIR>>/build/support/test/hotspot/jtreg/native/support/exeinvoke/exeinvoke.o]
>>> Error 1
>>
>> That seems like a glibc bug to me as SIGSTKSZ is supposed to be a constant.
> 
> It is still a constant in glibc's POSIX mode, but OpenJDK does not use
> POSIX mode (with good reason).  8192 bytes is really tight on AVX-512
> capability CPUs, so the code could still be buggy if it compiled.

Please note this only relates to building a test file not the product, 
so we should be able to change the way the test is built with no issue.

Cheers,
David

> Thanks,
> Florian
>