I follow the instructions on gem5 website and try to compile using command scons build/X86/gem5.opt -j 4.
However, it shows such error: "Error: Can't find a working Python installation”.

My environment is M2 MacBook Air, gem5 v22.1.0.0.
I’m sure that I have already installed Python 3.11.4 on my machine.
When I type which python in my zsh, it shows /opt/homebrew/opt/python@3.11/libexec/bin/python.
When I type which python-config, it shows /opt/homebrew/opt/python@3.11/libexec/bin/python-config.

I have searched the web and tried to add PYTHON_CONFIG=<PATH-TO-PYCONFIG>, but it doesn’t work.
I have no idea why scons can’t find my Python.

Hi,

With the current latest version of gem5, you must use python <= 3.10. Python 3.11 will be supported in the next release of gem5 coming very soon.

For details: https://gem5.atlassian.net/browse/GEM5-1295

Regards,

Gabriel

Hello,

The default python-config probably picks up your default Python installation (3.11) even if you choose a different Python version to invoke scons.
You could check this by running python-config and checking which link options it produces.

As Gabriel mentioned, Python 3.11 isn’t supported in the stable release of gem5 yet – full support will be added in the upcoming gem5 v23.0 release.

Until then, you could either:

1. Use the develop branch of gem5

2. Make sure you are using the correct python-config. It looks like you should be able to set this with an environment variable before running scons:

export PYTHON_CONFIG=python3.10-config

3. You could alternatively find where the list of possible python-configs is defined (site_scons/gem5_scons/defaults.py) and add e.g. python3.10-config at a higher priority.

4. Cherry pick the following three patches onto gem5 v22.1:

https://gem5-review.googlesource.com/c/public/gem5/+/70237
https://gem5-review.googlesource.com/c/public/gem5/+/68818
https://gem5-review.googlesource.com/c/public/gem5/+/68817

There is more information in this thread:
https://www.mail-archive.com/gem5-users@gem5.org/msg21505.html

I hope one of these options fixes your problem!

Best regards,

Richard.

From: 李明轩 via gem5-users gem5-users@gem5.org
Sent: Tuesday, June 20, 2023 8:41 PM
To: gem5-users@gem5.org
Cc: 李明轩 2000012801@stu.pku.edu.cn
Subject: [gem5-users] Re: Help: "Error: Can't find a working Python installation"

Hello, I’ve looked through the web you provided and tried python 3.8.17, python 3.9.17, python 3.10.12. None of them solved my problem, the terminal still outputs "Error: Can't find a working Python installation”.

Hi,

With the current latest version of gem5, you must use python <= 3.10. Python 3.11 will be supported in the next release of gem5 coming very soon.

For details: https://gem5.atlassian.net/browse/GEM5-1295

Regards,

Gabriel

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