bad library order returned by python-config.in

[taylor]

BPO	18096
Nosy	@warsaw, @doko42, @ned-deily, @davidmalcolm
Files	xx: Patch (unified diff format) of Misc/python-config.in against 3.3.1 fix-undef-ref.patch: Revised patch file for python-config.

^{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 2014-10-02.11:50:01.069>
created_at = <Date 2013-05-29.16:45:24.129>
labels = ['type-bug', 'library', 'build']
title = 'bad library order returned by python-config.in'
updated_at = <Date 2014-10-02.11:50:01.067>
user = 'https://bugs.python.org/taylor'

bugs.python.org fields:

activity = <Date 2014-10-02.11:50:01.067>
actor = 'doko'
assignee = 'none'
closed = True
closed_date = <Date 2014-10-02.11:50:01.069>
closer = 'doko'
components = ['Build', 'Demos and Tools', 'Library (Lib)']
creation = <Date 2013-05-29.16:45:24.129>
creator = 'taylor'
dependencies = []
files = ['30414', '36767']
hgrepos = []
issue_num = 18096
keywords = ['patch']
message_count = 4.0
messages = ['190319', '228107', '228141', '228221']
nosy_count = 7.0
nosy_names = ['barry', 'doko', 'ned.deily', 'dmalcolm', 'python-dev', 'taylor', 'logan']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'patch review'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue18096'
versions = ['Python 2.7', 'Python 3.4', 'Python 3.5']

[taylor]

Misc/python-config.in returns a bad library order when given the --ldflags or --libs arguments. A library should be listed *BEFORE* those libraries that it depends upon. The python library depends upon all the other libraries listed, but it is listed last -- it should be first.

When linking with shared libraries, you can generally get away with the current behaviour. When linking with static libraries, it fails

[logan]

It seems that this is still reproducible with Python 3.5 (dev) by running:

$ gcc test.c `python3-config --includes --ldflags`

cpython-install/lib/python3.5/config-3.5m/libpython3.5m.a(pytime.o): In function _PyTime_ObjectToTime_t': cpython-build/../cpython/Python/pytime.c:371: undefined reference to ceil'
cpython-build/../cpython/Python/pytime.c:373: undefined reference to `floor'
... skipped ...

I have slightly revised the patch to include Misc/python-config.sh.in as well. Please have a look. Thanks.

[python-dev]

New changeset 6316475af62d by doko in branch '2.7':

• Issue bpo-18096: Fix library order returned by python-config.
  https://hg.python.org/cpython/rev/6316475af62d

New changeset b826ba76d1ce by doko in branch '3.4':

• Issue bpo-18096: Fix library order returned by python-config.
  https://hg.python.org/cpython/rev/b826ba76d1ce

New changeset 8db7fcf6c67d by doko in branch 'default':

• Issue bpo-18096: Fix library order returned by python-config.
  https://hg.python.org/cpython/rev/8db7fcf6c67d

[doko42]

fixed in 2.7, 3.4 and 3.5