Build Python with -Wundef: don't use undefined macros

[vstinner]

BPO	46670
Nosy	@vstinner, @markshannon
PRs	bpo-46670: Define all macros for stringlib #31176 bpo-46670: Remove unused get_frame_state() function #31177 bpo-46670: Test if a macro is defined, not its value #31178 bpo-46670: Fix #ifdef WORDS_BIGENDIAN in audioop.c #31179 bpo-46670: Fix #ifdef in sha3module.c #31180 bpo-46670: Remove unused macros in the Python directory #31192 bpo-46670: Remove unused macros in the Objects directory #31193 bpo-46670: Remove unused macros in the Modules directory #31194 bpo-46670: Remove unused macros in ceval.c #31196

^{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 = None
closed_at = None
created_at = <Date 2022-02-06.23:52:36.108>
labels = ['build', '3.11']
title = "Build Python with -Wundef: don't use undefined macros"
updated_at = <Date 2022-02-07.15:22:33.054>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2022-02-07.15:22:33.054>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build']
creation = <Date 2022-02-06.23:52:36.108>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 46670
keywords = ['patch']
message_count = 10.0
messages = ['412690', '412695', '412696', '412697', '412746', '412753', '412755', '412756', '412757', '412758']
nosy_count = 2.0
nosy_names = ['vstinner', 'Mark.Shannon']
pr_nums = ['31176', '31177', '31178', '31179', '31180', '31192', '31193', '31194', '31196']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue46670'
versions = ['Python 3.11']

[vstinner]

Building Python with "gcc -Wundef" emits many warnings about usage of undefined macros. If a macro is not defined, it is equal to 0.

The problem is that a macro can be undefined because of a missing #include, or because of a typo in its name, or because "#ifdef MACRO" should be used instead of "#if MACRO". It can hide bugs.

I plan to fix these warnings.

[vstinner]

New changeset 16f96a4 by Victor Stinner in branch 'main':
bpo-46670: Remove unused get_frame_state() function (GH-31177)
16f96a4

[vstinner]

New changeset 097f74a by Victor Stinner in branch 'main':
bpo-46670: Define all macros for stringlib (GH-31176)
097f74a

[vstinner]

New changeset b556f53 by Victor Stinner in branch 'main':
bpo-46670: Test if a macro is defined, not its value (GH-31178)
b556f53

[vstinner]

-Wexpansion-to-defined and -Wunused-macros options are also interesting.

[markshannon]

New changeset 4b603f6 by Victor Stinner in branch 'main':
bpo-46670: Remove unused macros in ceval.c (GH-31196)
4b603f6

[vstinner]

New changeset 4f1d3f3 by Victor Stinner in branch 'main':
bpo-46670: Remove unused macros in the Modules directory (GH-31194)
4f1d3f3

[vstinner]

New changeset 7603491 by Victor Stinner in branch 'main':
bpo-46670: Remove unused macros in the Objects directory (GH-31193)
7603491

[vstinner]

New changeset 7d8b69e by Victor Stinner in branch 'main':
bpo-46670: Remove unused macros in the Python directory (GH-31192)
7d8b69e

[vstinner]

New changeset f20ca76 by Victor Stinner in branch 'main':
bpo-46670: Fix #ifdef in sha3module.c (GH-31180)
f20ca76