distutils: broken error reporting about vcvarsall.bat

[mgedmin]

BPO	25316
Nosy	@pfmoore, @mgedmin, @tjguk, @merwok, @zware, @zooba, @dstufft

^{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/zooba'
closed_at = <Date 2015-10-05.17:35:59.544>
created_at = <Date 2015-10-05.07:19:45.067>
labels = ['type-bug', 'library', 'OS-windows']
title = 'distutils: broken error reporting about vcvarsall.bat'
updated_at = <Date 2015-10-05.17:35:59.543>
user = 'https://github.com/mgedmin'

bugs.python.org fields:

activity = <Date 2015-10-05.17:35:59.543>
actor = 'steve.dower'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2015-10-05.17:35:59.544>
closer = 'steve.dower'
components = ['Distutils', 'Windows']
creation = <Date 2015-10-05.07:19:45.067>
creator = 'mgedmin'
dependencies = []
files = []
hgrepos = []
issue_num = 25316
keywords = ['3.5regression']
message_count = 4.0
messages = ['252308', '252349', '252350', '252351']
nosy_count = 8.0
nosy_names = ['paul.moore', 'mgedmin', 'tim.golden', 'eric.araujo', 'python-dev', 'zach.ware', 'steve.dower', 'dstufft']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue25316'
versions = ['Python 3.5']

[mgedmin]

When you try to build a C extension on Windows without having a C compiler, distutils tries to raise DistutilsPlatformError("Unable to find vcvarsall.bat"). However, on Python 3.5, it doesn't do that -- instead it lets a WinError(2 "no such file or directory") from _find_vcvarsall escape.

This breaks packages such as zope.interface that ship optional C modules for faster execution, but would like to work on people's computers even when there is no C compiler. See zopefoundation/zope.interface#24 for details.

[zooba]

Do you have a full stack trace for that exception? I don't see anywhere that should be able to raise WinError in _find_vcvarsall.

[zooba]

Ah, found it in the linked thread. I'll fix for 3.5.1.

[python-dev]

New changeset a2016b29762c by Steve Dower in branch '3.5':
Issue bpo-25316: distutils raises OSError instead of DistutilsPlatformError when MSVC is not installed.
https://hg.python.org/cpython/rev/a2016b29762c

New changeset 07161dd8a078 by Steve Dower in branch 'default':
Issue bpo-25316: distutils raises OSError instead of DistutilsPlatformError when MSVC is not installed.
https://hg.python.org/cpython/rev/07161dd8a078