It should be possible to build successfully without external libraries

[zware]

BPO	24986
Nosy	@pfmoore, @tjguk, @zware, @zooba
Files	2.7_external_build_handling.diff 3.5_external_build_handling.diff

^{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/zware'
closed_at = <Date 2015-09-04.04:56:19.449>
created_at = <Date 2015-09-02.20:30:29.880>
labels = ['type-bug', 'OS-windows', 'build']
title = 'It should be possible to build successfully without external libraries'
updated_at = <Date 2015-09-04.06:14:48.183>
user = 'https://github.com/zware'

bugs.python.org fields:

activity = <Date 2015-09-04.06:14:48.183>
actor = 'python-dev'
assignee = 'zach.ware'
closed = True
closed_date = <Date 2015-09-04.04:56:19.449>
closer = 'python-dev'
components = ['Build', 'Windows']
creation = <Date 2015-09-02.20:30:29.880>
creator = 'zach.ware'
dependencies = []
files = ['40322', '40323']
hgrepos = []
issue_num = 24986
keywords = ['patch']
message_count = 5.0
messages = ['249567', '249568', '249712', '249713', '249719']
nosy_count = 5.0
nosy_names = ['paul.moore', 'tim.golden', 'python-dev', 'zach.ware', 'steve.dower']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue24986'
versions = ['Python 2.7', 'Python 3.5', 'Python 3.6']

[zware]

We do have the option of leaving out all extension modules ("/p:IncludeExtensions=false"), but it would be nice to be able to build everything that doesn't require external libs.

This also be adds an option to skip only Tkinter (analogous to "/p:IncludeSSL=false"), as that's what I actually need at the moment :). I'm not adding options for every external project individually, as most of them are not a big deal, but OpenSSL, Tcl/Tk/Tix, and (on 2.7) bsddb take a long time to compile and might be nice to leave out when they're not needed (so I also added the ability to leave out bsddb on 2.7).

Leaving out 3.4 as its project files are not amenable to this kind of change, and 3.4's days are numbered anyway.

[zware]

This also changes the behavior of the '-e' flag on build.bat a bit, leaving off '-e' means there will be no attempt to build the modules that require external sources even if the sources are already there. Adding '-e' means building those modules will be attempted, subject to the '--no-<module>' flags.

[python-dev]

New changeset 2bc91f1f2b34 by Zachary Ware in branch '2.7':
Issue bpo-24986: Allow building Python without external libraries on Windows
https://hg.python.org/cpython/rev/2bc91f1f2b34

New changeset 301c36746e42 by Zachary Ware in branch '3.5':
Issue bpo-24986: Allow building Python without external libraries on Windows
https://hg.python.org/cpython/rev/301c36746e42

New changeset 50d38fa13282 by Zachary Ware in branch 'default':
Closes bpo-24986: Merge with 3.5
https://hg.python.org/cpython/rev/50d38fa13282

[zware]

The committed versions are slightly different, I had bad logic in adding _socket to ExtensionModules (if IncludeExternals was false while IncludeSSL was true, _socket wasn't added). build.bat also uses the property names instead of its own internal names so as not to stomp on the environment.

[python-dev]

New changeset 252d4760f28b by Zachary Ware in branch '2.7':
Issue bpo-24986: Save some bandwidth from svn.python.org
https://hg.python.org/cpython/rev/252d4760f28b

New changeset 4e7ce0b10eea by Zachary Ware in branch '3.5':
Issue bpo-24986: Save some bandwidth from svn.python.org
https://hg.python.org/cpython/rev/4e7ce0b10eea

New changeset eca6ecc62b95 by Zachary Ware in branch 'default':
Issue bpo-24986: Merge with 3.5
https://hg.python.org/cpython/rev/eca6ecc62b95