Cannot compile with /fp:strict with MSVC

[zware]

BPO	26262
Nosy	@tim-one, @pfmoore, @mdickinson, @pitrou, @vstinner, @tjguk, @bitdancer, @skrah, @zware, @serhiy-storchaka, @zooba
Files	constants.patch

^{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 2016-02-01.17:50:08.954>
labels = ['easy', 'build', 'OS-windows']
title = 'Cannot compile with /fp:strict with MSVC'
updated_at = <Date 2016-06-13.20:31:54.324>
user = 'https://github.com/zware'

bugs.python.org fields:

activity = <Date 2016-06-13.20:31:54.324>
actor = 'nharold'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build', 'Windows']
creation = <Date 2016-02-01.17:50:08.954>
creator = 'zach.ware'
dependencies = []
files = ['43379']
hgrepos = []
issue_num = 26262
keywords = ['patch', 'easy']
message_count = 2.0
messages = ['259336', '268471']
nosy_count = 13.0
nosy_names = ['tim.peters', 'paul.moore', 'mark.dickinson', 'pitrou', 'vstinner', 'tim.golden', 'r.david.murray', 'skrah', 'python-dev', 'zach.ware', 'serhiy.storchaka', 'steve.dower', 'nharold']
pr_nums = []
priority = 'low'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue26262'
versions = ['Python 3.6']

Linked PRs

• gh-70450: Fix MSVC /fp:strict builds #154849

[zware]

As reported in msg258685 (bpo-25934), Python cannot be built with /fp:strict while using MSVC. As Mark showed in msg258686 and msg258689, there are three calculations that could be replaced with suitable constants to allow /fp:strict to be used.

(Nosy list copied from bpo-25934)

[nharold]

Here's a patch with those three replacements and related comments.