[wwwdocs] Update changes.html with libstdc++ changes

[Jonathan Wakely]

On 08/04/15 13:06 +0200, Gerald Pfeifer wrote:
>On Sat, 6 Dec 2014, Jonathan Wakely wrote:
>> I'm also noting one old change in the GCC 4.5 page, and
>> removing/changing some links to the C++0x status table. The list of
>> features supported on trunk is fairly irrelevant to someone looking at
>> the 4.4 release notes, so I've linked to the docs for the relevant
>> release
>
>This was a good change, thank you.
>
>The only drawback of this, and some similar cases, is that we now
>risk referring to older versions on a release branch.  I do not
>have a good idea how to best handle this, so for now I updated
>references to online documentation to the latest versions (4.8.4
>and 4.9.2, respectively).

Yes, I realised that problem when making the change and linking to the
versions that were current at the time. One option would be to add a
gcc-4.8 symlink that points to the latest gcc-4.8.x version, but that
adds more work for the release managers and only has a small benefit.

Alternatively, since we only tend to have four or five releases from a
branch, we could just update them manually when we remember to. That's
only necessary until the branch closes, at which point the latest
release won't change. It's not a huge problem if the links don't go
to the latest docs immediately IMHO.