OpenJDK11 build on macOS with autoconf 2.72 / -std=gnu++11 option

[erik.joelsson at oracle.com]

That looks like a neat solution.

/Erik

On 1/5/24 07:36, Baesken, Matthias wrote:
> Seems there is already an util helper   " UTIL_GET_NON_MATCHING_VALUES"  .
> So should we do something like this  (maybe with a few more unwanted  -std= settings ?
> Seems the  UTIL_GET_NON_MATCHING_VALUES  so far accepts  only fix strings, is that correct ?
>
>
> diff --git a/make/autoconf/toolchain.m4 b/make/autoconf/toolchain.m4
> index 289eec3356b..8ff95c1114c 100644
> --- a/make/autoconf/toolchain.m4
> +++ b/make/autoconf/toolchain.m4
> @@ -389,6 +389,12 @@ AC_DEFUN_ONCE([TOOLCHAIN_POST_DETECTION],
>     # This is necessary since AC_PROG_CC defaults CFLAGS to "-g -O2"
>     CFLAGS="$ORG_CFLAGS"
>     CXXFLAGS="$ORG_CXXFLAGS"
> +
> +  # filter out some unwanted additions autoconf may add to CXX; we saw this on macOS with autoconf 2.72
> +  UTIL_GET_NON_MATCHING_VALUES(cxx_filtered, $CXX, -std=c++11 -std=gnu++11)
> +  if test "x$cxx_filtered" != x; then
> +    CXX="$cxx_filtered"
> +  fi
>   ])
>
>
> Best regards, Matthias
>
>> Btw. Is there already something  at make/autoconf that does similar filtering of unwanted flags ?
>> The mentioned TOOLCHAIN_POST_DETECTION  seems just to reset some variables  like CXX_CFLAGS to old values ,  not sure if  this is what we want here ?
>>
>>
>>> Hi Erik, I created  :
>>>
>>> https://bugs.openjdk.org/browse/JDK-8323008
>>> 8323008: filter out any -std* flags added by autoconf from CC/CXX
>>>
>