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Fri Oct 21 22:05:26 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-October/146752.html

On 10/21/2016 2:12 PM, Brett Cannon wrote:
>
>
> On Thu, 20 Oct 2016 at 04:48 Skip Montanaro <skip.montanaro at gmail.com
> <mailto:skip.montanaro at gmail.com>> wrote:
>
>     I've recently run into a problem building the math and cmath modules
>     for 2.7. (I don't rebuild very often, so this problem might have been
>     around for awhile.) My hg repos look like this:
>
>     * My cpython repo pulls from https://hg.python.org/cpython
>
>     * My 2.7 repo (and other non-tip repos) pulls from my cpython repo
>
>     I think this setup was recommended way back in the day when hg was new
>     to the Python toolchain to avoid unnecessary network bandwidth.
>
>     So, if I execute
>
>     hg pull
>     hg update
>
>     in first cpython, then 2.7 repos I should be up-to-date, correct?
>
>
> Nope, you need to execute the same steps in your 2.7 checkout if you're
> keeping it in a separate directory from your cpython repo that you're
> referring to

If the 2.7 repository shares the default repository, as described in the 
devguide, then only update is needed.  This has worked for me for at 
least two years.

-- 
Terry Jan Reedy

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[Python-Dev] Have I got my hg dependencies correct?