RFR: 8329257: AIX: Switch HOTSPOT_TOOLCHAIN_TYPE from xlc to gcc [v3]

[Joachim Kern]

On Tue, 30 Apr 2024 12:46:31 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> I got it. And what about simply disabling the `__STRICT_ANSI__` with
>> `CFLAGS_OS_DEF_JVM="-DAIX -D_LARGE_FILES -U__STRICT_ANSI__"` in flags-cflags.m4 for AIX. This worked too. The build is fine.
>
> So what you are saing is basically replacing
> 
>  CFLAGS_OS_DEF_JVM="-DAIX -Dalloca'(size)'=__builtin_alloca'(size)' -D_LARGE_FILES"
>  ```
> with
> 
>  CFLAGS_OS_DEF_JVM="-DAIX -D_LARGE_FILES -U__STRICT_ANSI__"
>  ```
> ?
> 
> Yeah, that'll work, I guess. "strict ansi" sounds like a problematic thing to have enabled, and that it is added by `-std=c++14` sounds close to a bug in my ears. So a "workaround" where this is disabled seem reasonable.

Yes this would be the replacement. This is our 4th way to fix the issue.
Anyone else who would prefer this too?

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PR Review Comment: https://git.openjdk.org/jdk/pull/18536#discussion_r1584847372