distutils doesn't search ".dll.a" as library on cygwin

[ocean-city]

BPO	4032
Nosy	@amauryfa, @tarekziade, @merwok, @zooba, @dstufft, @ma8ma
PRs	bpo-2445: Allow the UnixCCompiler.find_library_file to correctly find DLL import libs (.dll.a) on Cygwin #4136 bpo-4032: Cygwin: Add .dll.a to UnixCCompiler for searching libraries #4153
Dependencies	bpo-2445: Use The CygwinCCompiler Under Cygwin
Files	unixccompiler-implib.patch 2.7-unixccompiler-implib.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/tarekziade'
closed_at = <Date 2021-02-03.18:19:19.242>
created_at = <Date 2008-10-03.17:38:53.780>
labels = ['3.7', 'type-bug', 'library', 'build']
title = 'distutils doesn\'t search ".dll.a" as library on cygwin'
updated_at = <Date 2021-02-03.18:19:19.241>
user = 'https://bugs.python.org/ocean-city'

bugs.python.org fields:

activity = <Date 2021-02-03.18:19:19.241>
actor = 'steve.dower'
assignee = 'tarek'
closed = True
closed_date = <Date 2021-02-03.18:19:19.242>
closer = 'steve.dower'
components = ['Build', 'Distutils']
creation = <Date 2008-10-03.17:38:53.780>
creator = 'ocean-city'
dependencies = ['2445']
files = ['45261', '45262']
hgrepos = []
issue_num = 4032
keywords = ['patch']
message_count = 9.0
messages = ['74265', '119371', '119378', '119379', '119843', '279661', '279662', '305125', '386326']
nosy_count = 11.0
nosy_names = ['jlt63', 'amaury.forgeotdarc', 'ocean-city', 'vitalyy2000', 'tarek', 'tan2', 'eric.araujo', 'rpetrov', 'steve.dower', 'dstufft', 'masamoto']
pr_nums = ['4136', '4153']
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue4032'
versions = ['Python 2.7', 'Python 3.7']

[ocean-city]

This issue is derived from bpo-1706863.

[merwok]

Can you produce a patch?

(Removing Terry from nosy at his request)

[ocean-city]

I used to create the patch
http://bugs.python.org/file11597/experimental_distutils.patch
in bpo-1706863, but cygwin guys wanted this code implemented
in CCygwinCompiler class (See bpo-2445).

I think bpo-2445 should be resolved before.

[ocean-city]

Can you port that patch? I don't have cygwin installed now.

[merwok]

Okay, let’s reach a conclusion on the other bug before getting back to this one.

[ma8ma]

Move version to 3.7 and 2.7, and I updated two patches adding import library type for file searching.

Current Cygwin is used UnixCCompiler, and the compiler has be able to build extension module that doesn't need to library link at build time (e.g. array). And CygwinCCompiler has supported old version compilers, but its haven't maintained on Current Cygwin any longer. Therefore I think there is no necessary that waits solution to bpo-2445 and bpo-18654.

So would you be able to free dependence to bpo-2445, and start to review the patches?
Many thanks.