missing symbols in curses and readline modules on android

[xdegaye]

BPO	26853
Nosy	@skrah, @xdegaye, @Fak3, @moreati, @yan12125
Files	curses_readline.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 2016-04-28.08:01:03.501>
created_at = <Date 2016-04-26.13:01:37.720>
labels = ['type-bug', 'invalid', 'build']
title = 'missing symbols in curses and readline modules on android'
updated_at = <Date 2016-04-28.08:01:03.500>
user = 'https://github.com/xdegaye'

bugs.python.org fields:

activity = <Date 2016-04-28.08:01:03.500>
actor = 'xdegaye'
assignee = 'none'
closed = True
closed_date = <Date 2016-04-28.08:01:03.501>
closer = 'xdegaye'
components = ['Cross-Build']
creation = <Date 2016-04-26.13:01:37.720>
creator = 'xdegaye'
dependencies = []
files = ['42604']
hgrepos = []
issue_num = 26853
keywords = ['patch']
message_count = 5.0
messages = ['264274', '264319', '264327', '264329', '264422']
nosy_count = 5.0
nosy_names = ['skrah', 'xdegaye', 'Roman.Evstifeev', 'Alex.Willmer', 'yan12125']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue26853'
versions = ['Python 3.6']

[xdegaye]

The android loader complains when shared libraries are not linked against their needed libraries (see also issue bpo-21668). When ncurses is cross-compiled as a shared library, the curses and readline modules must be linked with libtinfow.so.

The attached patch is a quick hack: setup.py spawns readelf to get the list of needed libraries, but this fails as the readelf path name is wrong (it is not the absolute path) and so cannot be used as is for a correct patch.

[yan12125]

Things may be different if ncurses is built with --without-termlib or --enable-widec is not specified. I wasn't hit by this bug as my ncurses is built with --without-termlib.

[skrah]

Do you need libtinfow? It seems that it's not supported in setup.py,
and getting even libtinfo support into some Linux distributions took
quite a while.

[skrah]

IOW, on Linux tinfo should work fine in combination with ncursesw.

[xdegaye]

Thanks Chi Hsuan Yen and Stefan. Indeed the --with-termlib configure option documentation states: "When building the ncurses library, organize this as two parts: the curses library (libncurses) and the low-level terminfo library (libtinfo)". Using --without-termlib prevents that split.

My previous comment about readelf is wrong, the gcc cross-compiler is in the $PATH directory search path, as well as readelf.

Closing this issue as not a bug.