pythonnative version mismatch?

[Rick Altherr]

This was a really good question.  I wrote a blog post to document the
answer: https://www.kc8apf.net/2017/10/snakes-in-a-sysroot/.

On Fri, Oct 6, 2017 at 11:00 AM, Kun Yi <kunyi at google.com> wrote:

> Hello folks,
>
> I searched through the mailing list but haven't seen anyone brought up.
> Here's a weird bug I found on my setup: pythonnative seems to be using
> python3.4.3 whereas the recipe specified 2.7.
>
> Before diving into the layers of bitbake recipes to root cause what caused
> this, I want to post on the mailing list to see if it is reproducible on
> other setups, and if people have ideas why this went wrong (environment
> variable accidentally being overwritten?)
>
> *What I tested:*
> I found the code in phosphor-settings-manager, which inherits
> pythonnative, seems to be working per python 3, so added the following line
> into a native python function:
>
> python do_check_version () {
>   import sys
>   bb.warn(sys.version)
> }
> addtask check_version after do_configure before do_compile
>
> WARNING: phosphor-settings-manager-1.0-r1 do_check_version: 3.4.3
> (default, Nov 17 2016, 01:08:31)
>
> This is with openbmc git tip, building MACHINE=zaius
>
> *What the recipe should be using is seemingly 2.7:*
> $ cat ../import-layers/yocto-poky/meta/classes/pythonnative.bbclass
>
> inherit python-dir
> [...]
>
> $ cat ../import-layers/yocto-poky/meta/classes/python-dir.bbclass
> PYTHON_BASEVERSION = "2.7"
> PYTHON_ABI = ""
> PYTHON_DIR = "python${PYTHON_BASEVERSION}"
> PYTHON_PN = "python"
> PYTHON_SITEPACKAGES_DIR = "${libdir}/${PYTHON_DIR}/site-packages"
>
> *Why this is bad:*
> well, python2.7 and python3 have a ton of differences. A bug I discovered
> is due to usage of filter(), which returns different objects between
> Python2/3.
>
> --
> Regards,
> Kun
>
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