configure check for HAVE_CRYPT_R is wrong

[tiran]

BPO	45808
Nosy	@tiran
PRs	bpo-45808: Fix check for crypt_r on platforms without crypt.h #29563

^{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 2021-11-15.15:41:05.271>
labels = ['type-bug', '3.11']
title = 'configure check for HAVE_CRYPT_R is wrong'
updated_at = <Date 2021-11-15.15:52:50.230>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2021-11-15.15:52:50.230>
actor = 'christian.heimes'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2021-11-15.15:41:05.271>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 45808
keywords = ['patch']
message_count = 2.0
messages = ['406352', '406353']
nosy_count = 1.0
nosy_names = ['christian.heimes']
pr_nums = ['29563']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45808'
versions = ['Python 3.11']

[tiran]

The configure check for HAVE_CRYPT_R assumes that all platforms have <crypt.h>. Some platforms like FreeBSD don't have <crypt.h> at all. Instead the crypt_r() prototype is defined in <unistd.h>.

[tiran]

https://www.freebsd.org/cgi/man.cgi?crypt(3)

LIBRARY
Crypt Library (libcrypt, -lcrypt)

SYNOPSIS
 #include <unistd.h>

 char *
 crypt(const char *key, const char *salt);

[gstein]

Isn't the crypt module deprecated for 3.11 ?

[erlend-aasland]

Isn't the crypt module deprecated for 3.11 ?

Yes, it was deprecated in 3.11, and is now removed. Also, this issue was resolved by gh-29725.