RFR: 8319818: Address GCC 13.2.0 warnings (stringop-overflow and dangling-pointer) [v2]

[Mikael Vidstedt]

On Fri, 10 Nov 2023 18:08:17 GMT, Mikael Vidstedt <mikael at openjdk.org> wrote:

>> This PR is splitting out the GCC 13.2.0 warning related changes from #16550, excluding the Oracle/devkit parts, for clarity and to make potential backports more straightforward.
>> 
>> GCC 13.2.0 generates two new warnings:
>> 
>> * linux-aarch64-debug
>> 
>> src/hotspot/os_cpu/linux_aarch64/atomic_linux_aarch64.hpp:203:66: error: 'long unsigned int __atomic_load_8(const volatile void*, int)' writing 8 bytes into a region of size 0 overflows the destination [-Werror=stringop-overflow=]
>> 
>> I did not find any way to adjust the code to avoid this warning, so I instead chose to disable it in `CompileJvm.gmk` for linux-aarch64-(fast)debug only.
>> 
>> * linux-zero
>> 
>> src/hotspot/share/runtime/thread.hpp:579:77: error: storing the address of local variable 'rm' in '*_thr_current.Thread::_current_resource_mark' [-Werror=dangling-pointer=]
>> 
>> Lots and lots of warnings related to ResourceMark. Thanks to @stefank for suggesting moving the ASSERT implementation of the ResourceMark constructor to the .cpp file. With that change there's no need to explicitly disable the warning.
>
> Mikael Vidstedt has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add comment for stringop-overflow warning
>   
>   Co-authored-by: Hao Sun <hao.sun at arm.com>

Thank you for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/16584#issuecomment-1808666187