Some configure checks rely on implicit function declaration

[jmroot]

BPO	42598
Nosy	@ned-deily, @jmroot, @miss-islington
PRs	bpo-42598: Fix implicit function declarations in configure #23690 [3.9] bpo-42598: Fix implicit function declarations in configure (GH-23690) #23756 [3.8] bpo-42598: Fix implicit function declarations in configure (GH-23690) #23757

^{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 = <Date 2020-12-13.22:04:41.999>
created_at = <Date 2020-12-08.11:15:17.229>
labels = ['build', '3.8', '3.9', '3.10']
title = 'Some configure checks rely on implicit function declaration'
updated_at = <Date 2020-12-13.22:04:41.995>
user = 'https://github.com/jmroot'

bugs.python.org fields:

activity = <Date 2020-12-13.22:04:41.995>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2020-12-13.22:04:41.999>
closer = 'ned.deily'
components = ['Build']
creation = <Date 2020-12-08.11:15:17.229>
creator = 'jmr'
dependencies = []
files = []
hgrepos = []
issue_num = 42598
keywords = ['patch']
message_count = 5.0
messages = ['382726', '382940', '382941', '382942', '382943']
nosy_count = 3.0
nosy_names = ['ned.deily', 'jmr', 'miss-islington']
pr_nums = ['23690', '23756', '23757']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue42598'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[jmroot]

There are several cases in the configure script of exit being used without including stdlib.h, and one case of close being used without including unistd.h. A compiler that does not allow implicit function declaration, such as clang in Xcode 12, will error out due to this, which may cause the affected checks to give incorrect results.

[ned-deily]

New changeset 674fa0a by Joshua Root in branch 'master':
bpo-42598: Fix implicit function declarations in configure (GH-23690)
674fa0a

[ned-deily]

New changeset 3dcdbde by Miss Islington (bot) in branch '3.9':
bpo-42598: Fix implicit function declarations in configure (GH-23690) (GH-23756)
3dcdbde

[ned-deily]

New changeset 9feda9f by Miss Islington (bot) in branch '3.8':
bpo-42598: Fix implicit function declarations in configure (GH-23690) (GH-23757)
9feda9f

[ned-deily]

Thanks for noticing the failures and for the PR!