[issue20212] distutils: fix build_ext check to find whether we're building Python or not

[Steve Dower]

Steve Dower  added the comment:

Distutils is now deprecated (see PEP 632) and all tagged issues are being 
closed. From now until removal, only release blocking issues will be considered 
for distutils.

If this issue does not relate to distutils, please remove the component and 
reopen it. If you believe it still requires a fix, most likely the issue should 
be re-reported at https://github.com/pypa/setuptools

--
nosy: +steve.dower
resolution:  -> out of date
stage: patch review -> resolved
status: open -> closed

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[issue20212] distutils: fix build_ext check to find whether we're building Python or not

[Roumen Petrov]

Roumen Petrov added the comment:

P.S. two patches posted to Issue17219 are for master branch as second one 
should apply cleanly to current.

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[issue20212] distutils: fix build_ext check to find whether we're building Python or not

[Roumen Petrov]

Roumen Petrov added the comment:

actually proposed fix is my patch from 17219 with long history before.

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nosy: +rpetrov

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[issue20212] distutils: fix build_ext check to find whether we're building Python or not

[Éric Araujo]

Éric Araujo added the comment:

Hi, thanks for the report and patch.  How can I reproduce the error?

Matthias: which versions did you change to support cross-compile?  I understand 
this is a bug, not a new feature, so it should be fixed in all affected 
versions.

--
components: +Distutils
nosy: +eric.araujo
stage:  -> patch review

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[issue20212] distutils: fix build_ext check to find whether we're building Python or not

[STINNER Victor]

Changes by STINNER Victor :


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nosy: +doko, haypo

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[issue20212] distutils: fix build_ext check to find whether we're building Python or not

[Thomas Petazzoni]

New submission from Thomas Petazzoni:

The build_ext logic uses 
sys.executable.startswith(os.path.join(sys.exec_prefix, "bin")) to determine 
whether we're building a third-party Python extension, or a built-in Python 
extension. However, this check is wrong in cross-compilation mode, because the 
host Python interpreter might very well be installed in its prefix, when it is 
used to cross-compile the target modules and extensions. The current check 
would mis-detect this as we're building third-party Python modules, while we 
are in fact building the internal Python modules of the target Python.

Therefore, use the existing sysconfig.python_build variable, which provides the 
information of whether we're building Python itself or not in a correct way.

--
components: Cross-Build
files: 0002-distutils-fix-build_ext-check-to-find-whether-we-re-.patch
keywords: patch
messages: 207806
nosy: thomas-petazzoni
priority: normal
severity: normal
status: open
title: distutils: fix build_ext check to find whether we're building Python or 
not
type: compile error
versions: Python 3.4
Added file: 
http://bugs.python.org/file33394/0002-distutils-fix-build_ext-check-to-find-whether-we-re-.patch

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