[issue34986] python finds test modules from the wrong directory during PGO build

[Kal Sze]

Kal Sze  added the comment:

Oops, sorry for the noise. This is mostly a duplicate of #34985 because the 
crash log attachment was too big and caused the issue tracker's proxy server to 
return an error code, so I thought the initial bug report creation failed. An 
e-mail confirmation arrived only much later.

--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed

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[issue34986] python finds test modules from the wrong directory during PGO build

[Kal Sze]

New submission from Kal Sze :

OS: Ubuntu Desktop 18.04.1 x86-64
Python 3.7.0

When trying to build Python 3.7 from source, with the `--enable-shared 
--enable-optimizations --with-lto` configure options, python needs to run the 
test suite in order to generate PGO data. However, it turns out that it would 
find test modules from the wrong directory, if there is already another version 
of Python 3 installed system-wide (Ubuntu 18.04 comes with Python 3.6 
pre-installed).

I found out because Ubuntu's automatic crash reporter caught a core dump during 
`python -m tests.regrtest` and I could see that python found the tests.regrtest 
module at `/usr/lib/python3.6/test/regrtest.py`.

In the end, the build is reported as "successful", I guess it's because the 
Makefile expects it the crash anyway. In any case, it still seems wrong because 
it means the wrong test suite is run.

Ubuntu's crash report in raw format is attached, for anybody who knows how to 
read it (it's in plain text anyway)

--
components: Build
files: _usr_lib_python3.6_test_regrtest.py.1000.crash
messages: 327726
nosy: Kal Sze2
priority: normal
severity: normal
status: open
title: python finds test modules from the wrong directory during PGO build
type: behavior
versions: Python 3.7
Added file: 
https://bugs.python.org/file47868/_usr_lib_python3.6_test_regrtest.py.1000.crash

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