[Distutils] draft PEP: manylinux1

[Matthew Brett]

On Thu, Jan 21, 2016 at 11:05 AM, Matthew Brett <matthew.brett at gmail.com> wrote:
> Hi,
>
> On Thu, Jan 21, 2016 at 2:05 AM, M.-A. Lemburg <mal at egenix.com> wrote:
>> On 21.01.2016 10:31, Nick Coghlan wrote:
>>> On 21 January 2016 at 19:03, M.-A. Lemburg <mal at egenix.com> wrote:
>>>> By using the version based approach, we'd not run into this
>>>> problem and gain a lot more.
>>>
>>> I think it's better to start with a small core that we *know* works,
>>> then expand later, rather than trying to make the first iteration too
>>> wide. The "manylinux1" tag itself is versioned (hence the "1" at the
>>> end), so "manylinux2" may simply have *more* libraries defined, rather
>>> than newer ones.
>>
>> My argument is that the file based approach taken by the PEP
>> is too limiting to actually make things work for a large
>> set of Python packages.
>>
>> It will basically only work for packages that do not interface
>> to other external libraries (except for the few cases listed in
>> the PEP, e.g. X11, GL, which aren't always installed or
>> available either).
>>
>> IMO, testing the versions of a set of libraries is a safer
>> approach. It's perfectly fine to have a few dependencies
>> not work in a module because an optional system package is not
>> installed, e.g. say a package comes with UIs written in
>> Qt and one in GTK.
>
> Please forgive my slowness, but I don't understand exactly what you
> mean.  Can you give a specific example?
>
> Say my package depends on libpng.
>
> Call the machine I'm installing on the client machine.
>
> Are you saying that, when I build a wheel, I should specify to the
> wheel what versions of libpng I can tolerate on the the client
> machine, and if if the client does have a compatible version, then pip
> should raise an error, perhaps with a useful message about how to get
> libpng?

Sorry, slowness any typos - corrected:

Are you saying that, when I build a wheel, I should specify to the
wheel what versions of libpng I can tolerate on the the client
machine, and if the client does _not_ have a compatible version, then pip
should raise an error, perhaps with a useful message about how to get
libpng?

Best again,

Matthew