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PEP 517: add clarifying sentence about duplicate keys in config-settings (GH-2996)

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Ralf Gommers 2023-02-01 08:31:26 +00:00 committed by GitHub
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pep-0517.txt
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@ -374,9 +374,11 @@ dictionary provided as an "escape hatch" for users to pass ad-hoc
configuration into individual package builds. Build backends MAY
assign any semantics they like to this dictionary. Build frontends
SHOULD provide some mechanism for users to specify arbitrary
string-key/string-value pairs to be placed in this dictionary. For
example, they might support some syntax like ``--package-config
CC=gcc``. Build frontends MAY also provide arbitrary other mechanisms
string-key/string-value pairs to be placed in this dictionary.
For example, they might support some syntax like ``--package-config CC=gcc``.
In case a user provides duplicate string-keys, build frontends SHOULD
combine the corresponding string-values into a list of strings.
Build frontends MAY also provide arbitrary other mechanisms
for users to place entries in this dictionary. For example, ``pip``
might choose to map a mix of modern and legacy command line arguments
like::