RFR: JDK-8323008: filter out harmful -std* flags added by autoconf from CXX [v4]

[Julian Waters]

On Thu, 11 Jan 2024 14:31:47 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> It was observed, that autoconf 2.72 added on macOS x86_64 the flag -std=gnu++11 by default to CXX in the configure process .
>> This is not really wanted so better remove / filter out those -std* flags added by autoconf from CXX .
>> 
>> Seems we have something similar for some time for CFLAGS and CXXFLAGS ( see TOOLCHAIN_POST_DETECTION in make/autoconf/toolchain.m4) that
>>  dates back to JDK 9.
>> 
>> See the discussion about this issue : https://mail.openjdk.org/pipermail/build-dev/2024-January/042551.html
>
> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
> 
>   adjust GREP, remove unneeded test

The only downside to that solution on the other hand is the shell will issue a diagnostic about writing to a readonly var. Not sure if that is an acceptable tradeoff

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PR Comment: https://git.openjdk.org/jdk/pull/17301#issuecomment-1889220615