bpo-34689: Prevent sysconfig._parse_makefile from expanding $${variables} #20439
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The sysconfig._parse_makefile function expanded $${} formatted text
if another variable was present in a value. This change splits values
on $$ before searching for variables to avoid that.
Lib/sysconfig.py
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| value = value[:m.start()] + item + after | ||
| if "$" in after: | ||
| after = value[offset + m.end():] | ||
| value = value[:offset + m.start()] + item.replace('$', '$$') + after |
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| @@ -0,0 +1,2 @@ | |||
| Split strings prior to parsing in :func:`sysconfig._parse_makefile` so it | |||
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sysconfig._parse_makefile is not a documented function, so I don't think the func role should be used here.
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As described in [bpo-34689](https://www.bugs.python.org/issue34689), sysconfig._parse_makefile recognizes
$${variable}as a variable to expand in the second half of the_parse_makefilefunction.This pull-request aims to fix that by splitting strings on
$$before looking for variables in them and restoring the$$in values that require more processing.There is no change to the documentation as this is a bug-fix.
https://bugs.python.org/issue34689
Supersedes #9362