Move iocpsupport to external dist

[twisted-trac]

	@graingert reported
Trac ID	trac#10029
Type	enhancement
Created	2020-10-20 14:19:15Z

#7945

Twisted has a handful of (mostly optional) C extension modules, to provide support for the IOCP reactor, The vast majority of Twisted's users do not require these C modules, and it only makes it harder to install (requiring python-dev + a compiler). If they were bundled into another package and distributed on PyPI, then it would make the majority case simpler, but still allowing easy access to the extension modules.

This has the following direct benefits:

• Twisted users (Tahoe, Crossbar/Autobahn, Buildbot) no longer need to have a C compiler to install Twisted. (It will still be required for things like PyOpenSSL, but that is an optional dependency)
• Twisted can distribute a single wheel and a single source distribution on PyPI. The msi and exe installers and the Windows wheel will only be the C extensions, and therefore much smaller. Since these rarely change, they will not need to be changed on pypi for a long while.
• We can add extra C modules to this package, without having to hard-depend on CFFI in the future.

Searchable metadata

trac-id__10029 10029
type__enhancement enhancement
reporter__graingert graingert
priority__normal normal
milestone__None None
branch__ 
branch_author__ 
status__closed closed
resolution__fixed fixed
component__core core
keywords__None None
time__1603203555074383 1603203555074383
changetime__1603749476111647 1603749476111647
version__None None
owner__graingert graingert

[twisted-trac]

	@graingert commented

#1446

[twisted-trac]

	@wsanchez set owner to @graingert

[twisted-trac]

	@wsanchez set status to closed