Description

assignee = None
closed_at = None
created_at = <Date 2018-09-14.20:11:33.198>
labels = ['type-bug', 'library', '3.10']
title = 'Lib/sysconfig.py expands non-variables'
updated_at = <Date 2020-07-06.08:47:02.118>
user = 'https://github.com/lepaperwan'

activity = <Date 2020-07-06.08:47:02.118>
actor = 'terry.reedy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-09-14.20:11:33.198>
creator = 'lepaperwan'
dependencies = []
files = []
hgrepos = []
issue_num = 34689
keywords = ['patch']
message_count = 1.0
messages = ['325393']
nosy_count = 3.0
nosy_names = ['berker.peksag', 'serhiy.storchaka', 'lepaperwan']
pr_nums = ['9362', '20439']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34689'
versions = ['Python 3.10']

Activity

1. lepaperwan commented on Sep 14, 2018

   

   lepaperwanmannequin

   on Sep 14, 2018

   MannequinAuthor

   More actions

   Lib/sysconfig.py _parse_makefile needs to expand Makefile-style variables which includes $() ${} variables with a litteral $ being $$.

   That last particular point is properly accounted for in the first half of the function when determining values that need expansion and those that don't. However, the second half that actually performs variable expansion doesn't.

   Sample breaking input:
   VAR1= VALUE1
   VAR2= VALUE2
   VAR3=$${VAR1} ${VAR2}

   Output:
   Expect: {'VAR1': 'VALUE1', 'VAR2': 'VALUE2', 'VAR3': '$${VAR1} VALUE2'}
   Actual: {'VAR1': 'VALUE1', 'VAR2': 'VALUE2', 'VAR3': '$VALUE1 VALUE2'}

   I'm working on patching this but I'm putting this here as feedback is welcome.

   As far as I could tell, this is a side effect of b2b1217, which patched bpo-24705.
2. lepaperwan

   added

   3.7 (EOL)end of lifeend of life

   3.8 (EOL)end of lifeend of life

   stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   on Sep 14, 2018
3. terryjreedy

   added

   3.10 (EOL)end of lifeend of life

   and removed

   3.7 (EOL)end of lifeend of life

   3.8 (EOL)end of lifeend of life

   on Jul 6, 2020
4. ezio-melotti

   transferred this issue fromon Apr 10, 2022
5. FFY00

   added

   3.11only security fixesonly security fixes

   3.12only security fixesonly security fixes

   topic-sysconfig

   on Apr 3, 2023
6. StanFromIreland

   removed

   3.11only security fixesonly security fixes

   3.10 (EOL)end of lifeend of life

   3.12only security fixesonly security fixes

   on Aug 12, 2025
7. FFY00

   added a commit that references this issue on Oct 10, 2025

   pythonGH-78870: copy test from pythonGH-20439

   d110b05
8. FFY00 commented on Oct 10, 2025

   

   FFY00

   on Oct 10, 2025

   Member

   More actions

   This issue seems to have been fixed by GH-136166.
9. FFY00

   closed this as completedon Oct 10, 2025
10. FFY00

    added a commit that references this issue on Oct 10, 2025

    GH-78870: copy test from GH-20439 (#139884)

    9e15770

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