RFR: 8366777: Build fails unknown pseudo-op with old AS on linux-aarch64 [v13]

[SendaoYan]

On Thu, 11 Sep 2025 21:13:57 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> SendaoYan has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Create a seperate macro FLAGS_SETUP_SVE
>
> make/autoconf/flags-other.m4 line 140:
> 
>> 138:           ])],
>> 139:           [AVAILABLE=yes],
>> 140:           [AVAILABLE=no]
> 
> The documentation of `UTIL_ARG_ENABLE` says that `AVAILABLE` needs to be set to `false` when not available.

Thanks for the advice. Updated.

> make/autoconf/flags-other.m4 line 146:
> 
>> 144:         CFLAGS="$saved_cflags"
>> 145:         AC_LANG_POP([C])
>> 146:       fi
> 
> I think we need `AVAILABLE=fallse` when not matching the toolchain. This can also be expressed as `AVAILABLE: false` as a parameter to `UTIL_ARG_ENABLE`. The `CHECK_AVAILABLE` gets a chance to overwrite that value.

Thanks for the advice. Updated.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27073#discussion_r2342866398
PR Review Comment: https://git.openjdk.org/jdk/pull/27073#discussion_r2342866074