RFR: 8271869: AArch64: build errors with GCC11 in frame::saved_oop_result

Tue Aug 10 07:41:35 UTC 2021

On Thu, 5 Aug 2021 14:14:38 GMT, Alan Hayward <github.com+4146708+a74nh at openjdk.org> wrote:

> GCC11 warns that r0 is null. It does not complain if r1 is used instead.
> 
> AIUI, it is undefined behaviour in C++ to call member functions without
> a valid this pointer. So, technically GCC is correct to warn.

Yuck!  But I guess we don't have any other quick solution to supporting this compiler version, so as with JDK-8270083 I'm conditionally approving this as a temporary workaround.  I see this bug is already linked to JDK-8270140.

@theRealAph - You mentioned a prototype patch to fix the register definitions (probably addressing JDK-8270140?).  How close are you on that?  Do you need any help?

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PR: https://git.openjdk.java.net/jdk/pull/5020