Binary builds and workspaces

[Aleksey Shipilev]

On 12/09/2017 01:09 AM, Aleksey Shipilev wrote:
> On 12/08/2017 01:06 PM, Per Liden wrote:
>> On 2017-12-07 20:42, Aleksey Shipilev wrote:
>>>  *) Binary builds:
>>>      https://builds.shipilev.net/openjdk-zgc/
>>>
>>>    x86_64 is built natively, other targets are cross-compiled. Builds are updated every night,
>>>    build frequency might change in future, in both directions. I would try to make build logs
>>>    available too, for easier debugging.
>>
>> I noticed that you have aarch64 and IA32 builds there. Just a heads up, the ZGC code base only
>> supports Linux/x86_64 and Solaris/Sparc at this time.
> 
> That's not a problem. Shenandoah currently supports Linux/x86_64 and Linux/aarch64, but we build
> other platforms anyway, because sometimes changes in shared code may break the other platform's
> builds. It also helps to check that unsupported configurations fail predictably and reliably.

For example, aarch64 build fails with:

/pool/buildbot/slaves/sobornost/zgc/build/src/hotspot/share/gc/z/zGlobals.hpp:29:33: fatal error:
zGlobals_linux_aarch64.hpp: No such file or directory
 #include OS_CPU_HEADER(zGlobals)


And i386 build fails with multiple errors like these:

/pool/buildbot/slaves/sobornost/zgc/build/src/hotspot/os_cpu/linux_x86/zGlobals_linux_x86.hpp:83:65:
error: left shift count >= width of type [-Werror=shift-count-overflow]
 const uintptr_t ZPlatformAddressSpaceStart    = (uintptr_t)1 << ZPlatformAddressOffsetBits;
                                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~
/pool/buildbot/slaves/sobornost/zgc/build/src/hotspot/os_cpu/linux_x86/zGlobals_linux_x86.hpp:84:66:
error: left shift count >= width of type [-Werror=shift-count-overflow]
 const uintptr_t ZPlatformAddressSpaceSize     = ((uintptr_t)1 << ZPlatformAddressOffsetBits) * 4;
                                                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~

We were at the same position at some point, but the requirements for shipping Shenandoah with 8u
forced us to maintain buildable workspace even on platforms Shenandoah does not support.

Thanks,
-Aleksey