One version number, &c, take two

[Zack Weinberg]

Benjamin Kosnik <bkoz@redhat.com> writes:

>>  - From the libstdc++ folks: Advice on how to eliminate the copy of
>>    the date stamp in c++config (note that config/DATESTAMP presently
>>    is empty in a release tarball, although that could be changed ...
>>    come to think, that would reduce the number of steps in the release
>>    process, too).
>
> Yes, this should be changed if at all possible. I don't think this is
> unreasonable, actually.
>
> libstdc++ uses this in c++config.h, which is a generated file. Adding
> one more piece to the build machinery to paste in DATESTAMP for the
> __GLIBCXX__ define doesn't seem especially onerous to me.

Ah hah! I thought c++config was used as is.  I see how to make this work.

> I can't do this right now but if you check this in I'll get to it in
> the next two weeks.

I'll do better than that; I'll change it myself.  Revised patch coming
in a few hours, after testing completes.

zw