[aarch64-port-dev ] OpenJDK builds fails on AARCH64 with Ubuntu 1604

[Ningsheng Jian]

We also got this build failure on hs tree. It is apparently not
aarch64 only. Maybe we should initialize need_mem_bar first. Just
curious why gcc did not complain before Roland's change of that line
of code.

Thanks,
Ningsheng

On 18 March 2017 at 16:25, Andrew Haley <aph at redhat.com> wrote:
> On 17/03/17 22:20, White, Derek wrote:
>
>> I didn't see a code change here. Did the compiler change on Jenkins?
>> Can you report the gcc version used?
>>
>> Could also be change in compiler warning maybe-uninitialized (but I
>> couldn't find one).
>
> We had to fix a few of these before.  I added code like this:
>
> static jlong as_long(LIR_Opr data) {
>   jlong result;
>   switch (data->type()) {
>   case T_INT:
>     result = (data->as_jint());
>     break;
>   case T_LONG:
>     result = (data->as_jlong());
>     break;
>   default:
>     ShouldNotReachHere();
>     result = 0;  // unreachable
>   }
>   return result;
> }
>
> I hate having to do this.  We can't tell GCC that ShouldNotReachHere
> is noreturn because then it doesn't generate backtrace information,
> and we need that for debugging.
>
> Andrew.