cross compiling xxlimited fails with "Py_LIMITED_API is incompatible with Py_DEBUG"

[xdegaye]

BPO	28918
Nosy	@doko42, @vstinner, @xdegaye, @moreati
PRs	[Do Not Merge] Convert Misc/NEWS so that it is managed by towncrier #552
Files	xxlimited_abiflags.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/xdegaye'
closed_at = <Date 2016-12-11.19:30:35.481>
created_at = <Date 2016-12-09.08:51:23.145>
labels = ['type-bug', '3.7', 'build']
title = 'cross compiling xxlimited fails with "Py_LIMITED_API is incompatible with Py_DEBUG"'
updated_at = <Date 2017-03-31.16:36:07.251>
user = 'https://github.com/xdegaye'

bugs.python.org fields:

activity = <Date 2017-03-31.16:36:07.251>
actor = 'dstufft'
assignee = 'xdegaye'
closed = True
closed_date = <Date 2016-12-11.19:30:35.481>
closer = 'xdegaye'
components = ['Cross-Build']
creation = <Date 2016-12-09.08:51:23.145>
creator = 'xdegaye'
dependencies = []
files = ['45812']
hgrepos = []
issue_num = 28918
keywords = ['patch']
message_count = 4.0
messages = ['282771', '282773', '282774', '282856']
nosy_count = 5.0
nosy_names = ['doko', 'vstinner', 'xdegaye', 'python-dev', 'Alex.Willmer']
pr_nums = ['552']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28918'
versions = ['Python 3.6', 'Python 3.7']

[xdegaye]

This happens when the cross compilation is done with '--with-pydebug' while the native interpeter used to run setup.py has been built without it. The error message is:
Py_LIMITED_API is incompatible with Py_DEBUG, Py_TRACE_REFS, and Py_REF_DEBUG

[xdegaye]

Patch attached.

[vstinner]

xxlimited_abiflags.patch LGTM.

[python-dev]

New changeset f9e0c864157c by Xavier de Gaye in branch '3.6':
Issue bpo-28918: Fix the cross compilation of xxlimited when Python
https://hg.python.org/cpython/rev/f9e0c864157c

New changeset ff82dfd558df by Xavier de Gaye in branch 'default':
Issue bpo-28918: Merge 3.6.
https://hg.python.org/cpython/rev/ff82dfd558df