[committed] libstdc++: Deprecate the --enable-cheaders=c_std configuration

[Jonathan Wakely]

On 13/08/20 16:37 +0100, Jonathan Wakely wrote:
>These headers do not offer any tangible benefit compared to the default
>c_global version. They are not actively maintained meaning that they
>have bugs which have already been fixed for the c_global headers.
>
>This change adds a warning if they are used, and requires a new
>--enable-cheaders-obsolete option to allow their use. Unless we receive
>reports from users who rely on the c_std headers they should be removed
>at some point in future.
>
>libstdc++-v3/ChangeLog:
>
>	* acinclude.m4 (GLIBCXX_ENABLE_CHEADERS): Warn if the c_std
>	option is used and fail unless --enable-cheaders-obsolete is
>	also used.
>	* configure: Regenerate.
>
>Tested powerpc64le-linux. Committed to trunk.

And this is the change for the release notes. Pushed to wwwdocs.


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