Hey all, In November 2022 Python 3.11 was release and is slowly being rolled out for usage. In January of this year I became aware of an issue which makes gem5 incompatible with Python 3.11. I’ve outlined my findings, in detail, here: https://gem5.atlassian.net/browse/GEM5-1321.
In brief, Python 3.11 enforces a rule that Python Regex global flags must occur at the start of the regex expression which causes problems with Python Ply (our Python based lex and yacc tool, from here: https://github.com/dabeaz/ply). In gem5 we have code like this: ``` def t_STRLIT(self, t): r'(?m)"([^"])*"' # strip off quotes t.value = t.value[1:-1] t.lexer.lineno += t.value.count('\n') return t ``` In Python Ply this regex is appended to the end of a regex expression and, therefore, the Python Regex global flag (`(?m)` in this case) is not at the start of the expression and the following error is returned: ``` ERROR:fm_proj_ply:/gem5/build/ALL/arch/arm/fastmodel/SConscript:220: Invalid regular expression for rule 't_STRLIT'. global flags not at the start of the expression at position 13 SyntaxError: Can't build lexer ``` I’ve tried hacking away at this but have yet to find a solution that works correctly (more details about this are outlined in the Jira ticket). I’m reaching out to wonder if anyone has any nice solutions to this problem or, even better, if someone’s already found a work around on their end. This is a part of the code-base I don’t have much experience in and would appreciate some assistance if anyone has any ideas. Kind regards, Bobby -- Dr. Bobby R. Bruce Room 3050, Kemper Hall, UC Davis Davis, CA, 95616 web: https://www.bobbybruce.net
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