[Build] Make extensions depend on header files

[tiran]

BPO	45595
Nosy	@brettcannon, @tiran
PRs	bpo-45595: Make extensions depend on header files #29198

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/tiran'
closed_at = <Date 2021-10-25.18:38:31.275>
created_at = <Date 2021-10-24.09:01:25.224>
labels = ['type-feature', 'build', '3.11']
title = '[Build] Make extensions depend on header files'
updated_at = <Date 2021-10-25.18:38:31.275>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2021-10-25.18:38:31.275>
actor = 'christian.heimes'
assignee = 'christian.heimes'
closed = True
closed_date = <Date 2021-10-25.18:38:31.275>
closer = 'christian.heimes'
components = ['Build']
creation = <Date 2021-10-24.09:01:25.224>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 45595
keywords = ['patch']
message_count = 2.0
messages = ['404921', '404986']
nosy_count = 2.0
nosy_names = ['brett.cannon', 'christian.heimes']
pr_nums = ['29198']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue45595'
versions = ['Python 3.11']

[tiran]

Any change to a Python header file triggers a rebuild of Python core objects. The extension modules are not automatically rebuild in several cases. This is slightly annoying for core development because it forces me to do make clean too often.

• setup.py adds dependencies on Includes/*.h but not on header files in "internal" and "cpython" subdirectory
• Modules/Setup and makesetup do not add a dependency on PYTHON_HEADERS
• Modules/Setup is also missing dependencies on module-specific headers, e.g. _sre.o should depend on sre.h.

[tiran]

New changeset 81669d1 by Christian Heimes in branch 'main':
bpo-45595: Make extensions depend on header files (GH-29198)
81669d1