RFR: JDK-8282532: Allow explicitly setting build platform alongside --openjdk-target [v4]

[Julian Waters]

On Thu, 3 Mar 2022 13:16:08 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Julian Waters has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Syntax
>
> make/autoconf/configure line 298:
> 
>> 296:     exit 1
>> 297:   else
>> 298:     echo "Warning: You are using unsafe autoconf cross-compilation flags."
> 
> The autoconf flags are not really unsafe, they are just misleadingly named. I'd rather see that you restore "legacy" in this output, and the conf_legacy_crosscompile variable name.

Would it be better if I changed that to say the flags are misleading, or if I reverted it back to legacy in that case? (Since that seems to be the primary concern with using them)

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PR: https://git.openjdk.java.net/jdk/pull/7656