RFR: 8263718: unused-result warning happens at os_linux.cpp

[Yasumasa Suenaga]

On Wed, 17 Mar 2021 13:06:46 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>>> Isn't the standard way to silence these kind of problem to cast the result to (void):
>>> 
>>> ```
>>> (void)alloca(((pid ^ counter++) & 7) * 128);
>>> ```
>> 
>> I tried it at first, but I still saw the warning.
>
> I see. I found this page:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66425

Thanks @stefank !
Status of the Bugzilla ticket which you told is unconfirmed (and it does not seem to be updated since last year!).

I want to suppress the warning if we cannot remove `alloca()` call.

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PR: https://git.openjdk.java.net/jdk/pull/3042