Virtual environment sysconfig.get_path() and distutils.sysconfig.get_python_inc() reports base Python include directory

[MarkCampanelli]

BPO	36383
Nosy	@merwok, @zooba, @dstufft, @uranusjr

^{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 = None
closed_at = <Date 2021-02-03.18:07:53.083>
created_at = <Date 2019-03-20.16:53:48.144>
labels = ['3.7', 'type-bug', 'library']
title = 'Virtual environment sysconfig.get_path() and distutils.sysconfig.get_python_inc() reports base Python include directory'
updated_at = <Date 2021-02-03.18:07:53.082>
user = 'https://bugs.python.org/MarkCampanelli'

bugs.python.org fields:

activity = <Date 2021-02-03.18:07:53.082>
actor = 'steve.dower'
assignee = 'none'
closed = True
closed_date = <Date 2021-02-03.18:07:53.083>
closer = 'steve.dower'
components = ['Distutils', 'Library (Lib)']
creation = <Date 2019-03-20.16:53:48.144>
creator = 'Mark Campanelli'
dependencies = []
files = []
hgrepos = []
issue_num = 36383
keywords = []
message_count = 3.0
messages = ['338494', '357851', '386258']
nosy_count = 5.0
nosy_names = ['eric.araujo', 'steve.dower', 'dstufft', 'uranusjr', 'Mark Campanelli']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36383'
versions = ['Python 2.7', 'Python 3.7']

[MarkCampanelli]

On Windows 10 64bit, using virtualenv in Python 2.7.15 or venv in Python 3.7.2, calling distutils.sysconfig.get_python_inc() returns the path to the include directory for the (respective) Python base installation instead of the include directory installed with the virtual environment. This happens regardless of the True/False value of the plat_specific argument. I would expect the virtual environment's include directory to be returned.

[uranusjr]

I can replicate this on Linux as well. Furthormore, sysconfig.get_path('include') also returns the global path.

[zooba]

Distutils is now deprecated (see PEP-632) and all tagged issues are being closed. From now until removal, only release blocking issues will be considered for distutils.

If this issue does not relate to distutils, please remove the component and reopen it. If you believe it still requires a fix, most likely the issue should be re-reported at https://github.com/pypa/setuptools