Add an option to skip _decimal module

[yan12125]

BPO	26723
Nosy	@skrah, @moreati, @yan12125
Superseder	bpo-26846: Workaround for non-standard stdlib.h on Android
Files	allow-disable-libmpdec.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 = 'https://github.com/skrah'
closed_at = <Date 2016-04-09.19:35:17.249>
created_at = <Date 2016-04-09.18:40:00.464>
labels = ['extension-modules', 'type-feature', 'build']
title = 'Add an option to skip _decimal module'
updated_at = <Date 2016-04-26.09:12:10.761>
user = 'https://github.com/yan12125'

bugs.python.org fields:

activity = <Date 2016-04-26.09:12:10.761>
actor = 'skrah'
assignee = 'skrah'
closed = True
closed_date = <Date 2016-04-09.19:35:17.249>
closer = 'skrah'
components = ['Build', 'Extension Modules', 'Cross-Build']
creation = <Date 2016-04-09.18:40:00.464>
creator = 'yan12125'
dependencies = []
files = ['42415']
hgrepos = []
issue_num = 26723
keywords = ['patch']
message_count = 5.0
messages = ['263105', '263106', '263107', '263109', '264239']
nosy_count = 3.0
nosy_names = ['skrah', 'Alex.Willmer', 'yan12125']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = '26846'
type = 'enhancement'
url = 'https://bugs.python.org/issue26723'
versions = ['Python 3.6']

[yan12125]

As said by Stefan Krah in http://bugs.python.org/issue23496#msg236886, Android ports can use pure python decimal module. Of course I can, but _decimal is always built and error messages are spamming. This change allow disabling _decimal from ./configure.

For the complete build process, have a look into scripts and patches from https://github.com/yan12125/python3-android.

[skrah]

I thought you solved the locale problem in bpo-20305. So it still does not build?

[skrah]

In any case: It is not uncommon that some C module does not build.

You can disable modules in setup.py:

  # This global variable is used to hold the list of modules to be disabled.
  disabled_module_list = []

[yan12125]

Regarding bpo-20305: Now building is fine, while some runtime errors exist. I don't see reasons running ncurses on Android, so kicking those errors are not in my plan.

For this change: Thanks for pointing that variable - not noticing it before. Seems I still need to patch setup.py for disabling some specific modules? I don't like patches. They're just temporary workarounds for me. I see bpo-20210 proposing a general solution for disabling modules. Maybe I'll working on that instead.

[skrah]

After bpo-26846 _decimal builds on Android.