Hi all,

I had the same issue. The problem in my case was in scons, which was selecting 
python2 when building gem5 disregarding my python3 virtualenv

$less `which scons`
#! /usr/bin/python

And /usr/bin/python was linked to python2.7.

So the available solutions are:


  *   Installing a newer scons version with

#!/usr/bin/env python


  *   changing the symbolic link,
  *   modify the shebang of the preinstalled one,
  *   CL selection of the scons interpreter:

alias scons=python `which scons`

Kind Regards

Giacomo

From: Jieming Yin via gem5-dev <gem5-dev@gem5.org>
Sent: 09 October 2020 02:43
To: Poremba, Matthew <matthew.pore...@amd.com>
Cc: gem5 Developer List <gem5-dev@gem5.org>; Jieming Yin <bjm...@gmail.com>
Subject: [gem5-dev] Re: Build failed in Jenkins: Nightly #91

Hi Matt,

My workaround is to do it in a python2 manner:

class SEWorkload(Workload):
    type = 'SEWorkload'
    __metaclass__ = SEWorkloadMeta

I have the same syntax error because I am running the gem5-gcn docker, and I 
have both python2 and python3 installed. But I don't really know how to fix it, 
it seems python2 is used sometimes.

Jieming

On Thu, Oct 8, 2020 at 7:43 PM Bobby Bruce via gem5-dev 
<gem5-dev@gem5.org<mailto:gem5-dev@gem5.org>> wrote:
Hey Matt,

Before the nightly tests were run on Jenkins server which was an Ubuntu 18.04 
machine with Python2.

The nightly tests will now run using our Ubuntu 20.04 docker image: 
gcr.io/gem5-test/ubuntu-20.04_all-dependencies<http://gcr.io/gem5-test/ubuntu-20.04_all-dependencies>
 (Dockerfile source: 
https://gem5.googlesource.com/public/gem5/+/refs/heads/develop/util/dockerfiles/ubuntu-20.04_all-dependencies/Dockerfile).

So, to compile gem5.opt for the ARM ISA, the nightly will use:

```
docker run -u $UID:$GID --volume $(pwd):$(pwd) -w $(pwd) --rm 
gcr.io/gem5-test/ubuntu-20.04_all-dependencies<http://gcr.io/gem5-test/ubuntu-20.04_all-dependencies>
 scons build/ARM/gem5.opt
```

I'm going to guess you probably still have Python2 somewhere on your machine 
and it's using it during the compilation. I'll setup some tests on my end and 
see if I can recreate this problem. I _think_ right now we only test in 
environments that either have only Python2 or have only Python3, so we should 
probably have some tests to check what happens if someone has both.

Kind regards,
Bobby
--
Dr. Bobby R. Bruce
Room 2235,
Kemper Hall, UC Davis
Davis,
CA, 95616

web: https://www.bobbybruce.net


On Thu, Oct 8, 2020 at 4:10 PM Poremba, Matthew 
<matthew.pore...@amd.com<mailto:matthew.pore...@amd.com>> wrote:

[AMD Public Use]

Hi Bobby,


What is/was the fix for this issue? I also cannot build even though I have 
python 3.6 installed (via apt-get on Ubuntu 20.04).  I am manually passing 
python3-config to scons but I’m getting a syntax error when it sees the 
metaclass keyword.


-Matt

From: Bobby Bruce via gem5-dev <gem5-dev@gem5.org<mailto:gem5-dev@gem5.org>>
Sent: Thursday, October 8, 2020 3:19 PM
To: gem5 Developer List <gem5-dev@gem5.org<mailto:gem5-dev@gem5.org>>
Cc: Bobby Bruce <bbr...@ucdavis.edu<mailto:bbr...@ucdavis.edu>>
Subject: [gem5-dev] Re: Build failed in Jenkins: Nightly #91

[CAUTION: External Email]
Hey all,

The source of this issue is that our Jenkin's server was using Python2, and a 
commit was merged which utilized some Python3 exclusive features: 
https://gem5-review.googlesource.com/c/public/gem5/+/33900<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgem5-review.googlesource.com%2Fc%2Fpublic%2Fgem5%2F%2B%2F33900&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081348428&sdata=Ux12iZ%2Bj0umYNRs7KDlkuZcHZEpE3tOvRlV6Tsyy%2B3Y%3D&reserved=0>

We are going to drop support for Python2 in the next release, so I've upgraded 
our nightly tests to use Python3. They should pass tonight.

I'm unsure if this has been officially announced in any capacity, but as we're 
dropping Python2 support in the next release, you may submit patches containing 
Python3 code without any requirement of providing some Python2 backwards 
compatibility.

The compilation tests also failed as we're using Python2 there as well. I'm 
currently working on a fix for these tests.

Kind regards,
Bobby
--
Dr. Bobby R. Bruce
Room 2235,
Kemper Hall, UC Davis
Davis,
CA, 95616

web: 
https://www.bobbybruce.net<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.bobbybruce.net%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081358426&sdata=K7p4NxR5oOe5EwzEP4mkuGWTqZOGyDMn%2BzP8J5MPSzk%3D&reserved=0>


On Wed, Oct 7, 2020 at 11:49 PM jenkins-no-reply--- via gem5-dev 
<gem5-dev@gem5.org<mailto:gem5-dev@gem5.org>> wrote:
See 
<https://jenkins.gem5.org/job/Nightly/91/display/redirect?page=changes<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjenkins.gem5.org%2Fjob%2FNightly%2F91%2Fdisplay%2Fredirect%3Fpage%3Dchanges&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081368416&sdata=UA%2BkCy45Ggv1hLVQ2vgtKisVgQxnkVaLL8NPNSSaqfY%3D&reserved=0>>

Changes:

[giacomo.travaglini] arch: Add generic BaseMMU

[giacomo.travaglini] fastmodel: Add IrisMMU model

[gabeblack] sim: Add a mechanism for finding an compatible SE workload.

[gabeblack] sparc: Clean up some code in base.isa.

[gabeblack] sparc: Simplify the IntOp format slightly.


------------------------------------------
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 [     CXX] NULL/python/marshal.cc -> .o
 [ DEFINES]  -> NULL/python/m5/defines.py
 [    INFO] COPYING, LICENSE, README -> NULL/python/m5/info.py
 [ TRACING]  -> NULL/debug/RubyNetwork.hh
 [     CXX] NULL/mem/ruby/network/garnet/GarnetLink.cc -> .o
 [     CXX] NULL/mem/ruby/network/garnet/GarnetNetwork.cc -> .o
 [    LINK]  -> NULL/marshal
 [EMBED PY] NULL/marshal, python/m5/util/attrdict.py -> 
python/m5/util/attrdict.py.cc<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fattrdict.py.cc%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081408398&sdata=Mff738dDg%2BD%2Bhc8vcaQj3ejr1Y%2BoGZ1%2B5tWnjWL%2FPxM%3D&reserved=0>
 [     CXX] 
NULL/python/m5/util/attrdict.py.cc<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fattrdict.py.cc%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081408398&sdata=Mff738dDg%2BD%2Bhc8vcaQj3ejr1Y%2BoGZ1%2B5tWnjWL%2FPxM%3D&reserved=0>
 -> .o
 [EMBED PY] NULL/marshal, NULL/mem/ruby/structures/DirectoryMemory.py -> 
NULL/mem/ruby/structures/DirectoryMemory.py.cc<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdirectorymemory.py.cc%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081418390&sdata=O%2FwZelf2l424gICz7WhCcjgONMVXFrBPaHBOXNB6Kbc%3D&reserved=0>
 [     CXX] 
NULL/mem/ruby/structures/DirectoryMemory.py.cc<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdirectorymemory.py.cc%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081418390&sdata=O%2FwZelf2l424gICz7WhCcjgONMVXFrBPaHBOXNB6Kbc%3D&reserved=0>
 -> .o
 [EMBED PY] NULL/marshal, dev/pci/PciHost.py -> 
dev/pci/PciHost.py.cc<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fpcihost.py.cc%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081428386&sdata=Uwv3KNoVmTwEUWVpRv2%2F1UO1FJKiTvcLM3ukjg6GaQ4%3D&reserved=0>
 [EMBED PY] NULL/marshal, NULL/mem/ruby/network/BasicRouter.py -> 
NULL/mem/ruby/network/BasicRouter.py.cc<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fbasicrouter.py.cc%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081438387&sdata=G9grHjylduUp91PXkowKB9zj%2FJ%2F2HDSE43M28vq5QHc%3D&reserved=0>
 [     CXX] 
NULL/dev/pci/PciHost.py.cc<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fpcihost.py.cc%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081438387&sdata=QaPwyhpCjoRuw6jrAogTqclblXfbuI8phdxVfFq0vN0%3D&reserved=0>
 -> .o
 [     CXX] 
NULL/mem/ruby/network/BasicRouter.py.cc<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fbasicrouter.py.cc%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081448380&sdata=hOtvCJyLENjQ9G4wSgw%2FmVzfZ8yuL6F8xVvGJ54ATQE%3D&reserved=0>
 -> .o
 [EMBED PY] NULL/marshal, python/m5/objects/__init__.py -> 
python/m5/objects/__init__.py.cc
 [     CXX] NULL/python/m5/objects/__init__.py.cc -> .o
 [EMBED PY] NULL/marshal, NULL/mem/cache/prefetch/Prefetcher.py -> 
NULL/mem/cache/prefetch/Prefetcher.py.cc<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fprefetcher.py.cc%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081448380&sdata=%2BW1S3QeSht2Maf53LN0CnBF10PEmFHiH5MU3vwIJAxU%3D&reserved=0>
 [     CXX] 
NULL/mem/cache/prefetch/Prefetcher.py.cc<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fprefetcher.py.cc%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081458376&sdata=C83eYtI%2BUefOKFsASFl9Yg00T%2FvdXY5JRyRAr%2BSzzZ4%3D&reserved=0>
 -> .o
 [EMBED PY] NULL/marshal, sim/Workload.py -> 
sim/Workload.py.cc<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fworkload.py.cc%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081458376&sdata=ml2qmDHOW1euBdEifr8bMvtL8VXIk3Awl%2B0IzTrjASY%3D&reserved=0>
terminate called after throwing an instance of 'pybind11::error_already_set'
  what():  SyntaxError: ('invalid syntax', ('build/NULL/sim/Workload.py', 61, 
37, 'class SEWorkload(Workload, metaclass=SEWorkloadMeta):\n'))

At:
  <string>(4): <module>

scons: *** 
[build/NULL/sim/Workload.py.cc<https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fworkload.py.cc%2F&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081468372&sdata=dUKqB0ZKy%2BOD2FiAsG6nXZNrkU6cgpbdqz4gwWR5A9I%3D&reserved=0>]
 CalledProcessError : Command 
'['<https://jenkins.gem5.org/job/Nightly/ws/build/NULL/marshal<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjenkins.gem5.org%2Fjob%2FNightly%2Fws%2Fbuild%2FNULL%2Fmarshal&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081478372&sdata=JlRaOti3X1n7srb0NkcGxBLHPHv0uYC0YNHycSSTX4Y%3D&reserved=0>',>
 'build/NULL/sim/Workload.py']' died with <Signals.SIGABRT: 6>.
Traceback (most recent call last):
  File "/usr/lib/scons/SCons/Action.py", line 1209, in execute
    result = self.execfunction(target=target, source=rsources, env=env)
  File 
"<https://jenkins.gem5.org/job/Nightly/ws/build/NULL/SConscript<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjenkins.gem5.org%2Fjob%2FNightly%2Fws%2Fbuild%2FNULL%2FSConscript&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081478372&sdata=sSgYL4p8YLHHwQZpC7rDWR5WggafX5VyG36jqkwiCvk%3D&reserved=0>",>
 line 1166, in embedPyFile
    marshalled = subprocess.check_output(
  File "/usr/lib/python3.8/subprocess.py", line 411, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/usr/lib/python3.8/subprocess.py", line 512, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command 
'['<https://jenkins.gem5.org/job/Nightly/ws/build/NULL/marshal<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjenkins.gem5.org%2Fjob%2FNightly%2Fws%2Fbuild%2FNULL%2Fmarshal&data=02%7C01%7Cmatthew.poremba%40amd.com%7Cfbadcb5540864f21620c08d86bd84e41%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637377924081488365&sdata=lpGK%2FVYNSgndFa%2FANyH%2FzEqqIYWzrZ3399nzcChxJ0c%3D&reserved=0>',>
 'build/NULL/sim/Workload.py']' died with <Signals.SIGABRT: 6>.
scons: building terminated because of errors.
*** Summary of Warnings ***
Warning: Your compiler doesn't support incremental linking and lto at the same
         time, so lto is being disabled. To force lto on anyway, use the
         --force-lto option. That will disable partial linking.
Warning: python3-config could not be found.
         Future releases of gem5 will drop support for python2.
Warning: Header file <png.h> not found.
         This host has no libpng library.
         Disabling support for PNG framebuffers.
Build step 'Execute shell' marked build as failure
Archiving artifacts
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