[Python-Dev] Is distutils.util.get_platform() the "current" or the "target" platform

[Paul Monson]

Thanks for the feedback. 
I updated the PR to use get_platform and get_host_platform.
More testing is still needed before it's ready to merge to make sure it still does what it was intended to do.

-----Original Message-----
From: Python-Dev <python-dev-bounces+paulmon=microsoft.com at python.org> On Behalf Of Xavier de Gaye
Sent: Tuesday, February 19, 2019 12:06 PM
To: Steve Dower <steve.dower at python.org>; python-dev at python.org
Subject: Re: [Python-Dev] Is distutils.util.get_platform() the "current" or the "target" platform

> [Any reason for dropping python-dev?]

Sorry. just clicked the wrong button.

> And the answer is a resounding "yes, it returns the target platform"? It seems you're saying this, but the wording of your email sounds just enough of a question that I'm not sure whether you are definitively answering it or not.

The answer is yes indeed, it returns the target platform.
This is a listing of the non-obvious steps that lead to this conclusion.

Xavier


On 2/19/19 8:45 PM, Steve Dower wrote:
> [Any reason for dropping python-dev?]
> 
> On 19Feb2019 1139, Xavier de Gaye wrote:
>> Is distutils.util.get_platform() the "current" or the "target" platform ?
> 
> I *think* you're answering this below, yes?
> 
>> * When cross-compiling on posix platforms using autoconf, configure is
>>    run with the '--host=host-type' [1] command line option to specify
>>    the target platform.
>>
>> * The AC_CANONICAL_HOST macro is used by configure.ac to get the
>>    canonical variables `host' and `host_cpu' [2].
>>    Those variables are used to compute _PYTHON_HOST_PLATFORM.
>>
>> * The Makefile generated by configure runs setup.py,
>>    generate-posix-vars, etc... on the build platform using
>>    PYTHON_FOR_BUILD, a native python interpreter that is set
>>    to run with the _PYTHON_HOST_PLATFORM environment variable.
>>
>> * get_platform() in setup.py and in Lib/distutils/util.py returns the
>>    value of _PYTHON_HOST_PLATFORM when cross-compiling.
>>
>> So the process of cross-compilation on posix platforms has
>> get_platform() return the target ('host' in autoconf terminology) platform.
>>
>> [1] https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.gnu.org%2Fsavannah-checkouts%2Fgnu%2Fautoconf%2Fmanual%2Fautoconf-2.69%2Fhtml_node%2FSpecifying-Target-Triplets.html&data=02%7C01%7CPaul.Monson%40microsoft.com%7C186de203c3d644c7517208d696a5f266%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636862036817328765&sdata=2PMKn%2Bt5ed82gkSBnew0nT1TA1qzDuU3VZNOFPYPqIM%3D&reserved=0
>> [2] https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.gnu.org%2Fsavannah-checkouts%2Fgnu%2Fautoconf%2Fmanual%2Fautoconf-2.69%2Fhtml_node%2FCanonicalizing.html&data=02%7C01%7CPaul.Monson%40microsoft.com%7C186de203c3d644c7517208d696a5f266%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636862036817328765&sdata=zRtcyLjDrkL%2BfcignLCDjtUri29j7mCscdVkGqhNk50%3D&reserved=0
> 
> And the answer is a resounding "yes, it returns the target platform"? It seems you're saying this, but the wording of your email sounds just enough of a question that I'm not sure whether you are definitively answering it or not.
> 
> Cheers,
> Steve

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