RFR: JDK-8323008: filter out any -std* flags added by autoconf from CC/CXX

[Matthias Baesken]

On Mon, 8 Jan 2024 10:16:21 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 any -std* flags added by autoconf from CC/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

Strange, I noticed that for some reason the  UTIL_GET_NON_MATCHING_VALUES(cxx_filtered, $CXX, -std=c++11 -std=gnu++11)  seems not to remove the flags as expected, did I misinterpret how UTIL_GET_NON_MATCHING_VALUES works ? Any ideas ?
An
`CXX=`echo $CXX | cut -d ' ' -f1``
extracted what we want (not sure if we want to do it that way,  in case we have blanks in the CXX value ?

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PR Comment: https://git.openjdk.org/jdk/pull/17301#issuecomment-1883357259