android: cross-compilation of extension module links to the wrong python library

[xdegaye]

BPO	26884
Nosy	@merwok, @xdegaye, @dstufft, @moreati
Files	build.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 = None
closed_at = <Date 2016-06-04.22:44:37.131>
created_at = <Date 2016-04-29.10:32:10.927>
labels = ['build']
title = 'android: cross-compilation of extension module links to the wrong python library'
updated_at = <Date 2016-06-04.22:44:37.130>
user = 'https://github.com/xdegaye'

bugs.python.org fields:

activity = <Date 2016-06-04.22:44:37.130>
actor = 'doko'
assignee = 'none'
closed = True
closed_date = <Date 2016-06-04.22:44:37.131>
closer = 'doko'
components = ['Cross-Build']
creation = <Date 2016-04-29.10:32:10.927>
creator = 'xdegaye'
dependencies = []
files = ['42650']
hgrepos = []
issue_num = 26884
keywords = ['patch']
message_count = 3.0
messages = ['264484', '265340', '267337']
nosy_count = 5.0
nosy_names = ['eric.araujo', 'xdegaye', 'python-dev', 'dstufft', 'Alex.Willmer']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue26884'
versions = ['Python 3.6']

[xdegaye]

configure of the cross compilation is run with '--enable-shared --with-pydebug'.

The cross-compilation fails attempting to link the extension module objects with a non existing libpython3.6m instead of libpython3.6dm, when the native python that is used to run setup.py had not been configured with --with-pydebug.

The attached patch fixes this problem.

[xdegaye]

Another description of the problem:

• On the build system, the native python (in one of the search directories of PATH) has been built without --with-pydebug.
• The cross-compilation is done on this build system with --with-pydebug.
• The cross-compilation of all the Python extension modules fails with:
  /bin/ld: error: cannot find -lpython3.6m
  collect2: error: ld returned 1 exit status

[python-dev]

New changeset d00837de03d7 by doko in branch '3.5':

• Issue bpo-26884: Fix linking extension modules for cross builds.
  https://hg.python.org/cpython/rev/d00837de03d7