New submission from Anand B Pillai:
On Python 3.5.0a1+ built from source,
>>> import sysconfig
>>> sysconfig.is_python_build()
False
>>> sysconfig.is_python_build(True)
False
>>> sysconfig._PROJECT_BASE
'/opt/bin'
>>> import sys
>>> sys._home
>>>
The problem is, when sys._home is None, this function uses
_is_python_source_dir(_PROJECT_BASE) . In this case the _PROJECT_BASE is
clearly passed wrongly as '/opt/bin'. That is the INSTALL_PREFIX, not
_PROJECT_BASE .
Let us do a small hack and set _PROJECT_BASE to the folder where I build this
Python version.
# Of course this can't be reproduced but you get the idea.
>>> sysconfig._PROJECT_BASE='/home/anand/code/cpython/'
>>> sysconfig.is_python_build()
True
The documentation says,
"
sysconfig.is_python_build()
Return True if the current Python installation was built from source.
"
which is clearly in conflict with what it is doing.
>From a quick look at sysconfig.py it looks like it is calculating
>_PROJECT_BASE wrongly.
I can give a patch for this, but first I am more interested in finding out what
this function is supposed to do - why have this function if you are not able to
get the details of the build environment from the built interpreter ? Clearly
it is not doing that here.
The conclusions are part of the attached file in comments.
----------
components: Library (Lib)
messages: 238993
nosy: pythonhacker
priority: normal
severity: normal
status: open
title: sysconfg.is_python_build() is buggy
versions: Python 3.4, Python 3.5
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23746>
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