#15317: Troubles with Python and ncurses on Cygwin
-------------------------------------+-------------------------------------
Reporter: jpflori | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.1
Component: porting: Cygwin | Resolution:
Keywords: cygwin spkg | Merged in:
ncurses | Reviewers:
Authors: Jean-Pierre Flori | Work issues:
Report Upstream: Workaround found; | Commit:
Bug reported upstream. | 79166403ba2f72a9cda9a6641a8914293d3cd2d1
Branch: | Stopgaps:
u/jpflori/ticket/15317 |
Dependencies: |
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Changes (by {'newvalue': u'Jean-Pierre Flori', 'oldvalue': ''}):
* status: new => needs_review
* author: => Jean-Pierre Flori
* branch: => u/jpflori/ticket/15317
* upstream: Fixed upstream, but not in a stable release. => Workaround
found; Bug reported upstream.
* commit: => 79166403ba2f72a9cda9a6641a8914293d3cd2d1
Old description:
> Python currently fails/is suboptimal on Cygwin because:
> * it does not properly detect readline which is only installed as a
> shared library, patch "2.7.3-dylib.patch" from Cygwin package fixes that;
> * the curses module is not built because of undefined refs, just passing
> -lcurses when linking is not enough, one should add -ltinfo; in fact the
> real problem is that setup.py tries to run ldd on the import library
> (dll.a) which fails to detect what libraries are already linked and
> anyway would decide to discard -ltinfo as its already linked to readline,
> but on Cygwin you have to explicitely pass everything...
> * it segfault at startup when loading the readline module, not sure why.
> It looks exactly as what is reported at
> http://trac.macports.org/ticket/29496 . Rebuilding ncurses with debug
> info (including CFLAGS="-O0 -g" which cannot easily be passed right now)
> does not give much info. The offending line pointed by GCC is "char
> *result = exit_attribute_mode;"; maybe some dark magic going on as
> reported in http://lists.gnu.org/archive/html/bug-
> ncurses/2006-10/msg00002.html ; please not that on Cygwin the stack is
> small by default but playing a little bit with that did not really help.
> Further info: ncurses 5.7 is fine, ncurses 5.8 fails in the same way.
> Upstream bu report: http://lists.gnu.org/archive/html/bug-
> ncurses/2013-10/msg00014.html. Should be fixed with
> http://lists.gnu.org/archive/html/bug-ncurses/2013-10/msg00017.html
New description:
Python currently fails/is suboptimal on Cygwin because:
* it does not properly detect readline which is only installed as a shared
library, patch "2.7.3-dylib.patch" from Cygwin package fixes that;
* the curses module is not built because of undefined refs, just passing
-lcurses when linking is not enough, one should add -ltinfo; in fact the
real problem is that setup.py tries to run ldd on the import library
(dll.a) which fails to detect what libraries are already linked and anyway
would decide to discard -ltinfo as its already linked to readline, but on
Cygwin you have to explicitely pass everything...
* it segfault at startup when loading the readline module, not sure why.
It looks exactly as what is reported at
http://trac.macports.org/ticket/29496 . Rebuilding ncurses with debug info
(including CFLAGS="-O0 -g" which cannot easily be passed right now) does
not give much info. The offending line pointed by GCC is "char *result =
exit_attribute_mode;"; maybe some dark magic going on as reported in
http://lists.gnu.org/archive/html/bug-ncurses/2006-10/msg00002.html ;
please not that on Cygwin the stack is small by default but playing a
little bit with that did not really help. Further info: ncurses 5.7 is
fine, ncurses 5.8 fails in the same way. Upstream bu report:
http://lists.gnu.org/archive/html/bug-ncurses/2013-10/msg00014.html.
Should be fixed with http://lists.gnu.org/archive/html/bug-
ncurses/2013-10/msg00017.html
This ticket fixes the Python part.
The ncurses part is #15617
--
Comment:
The branch I pushed is cleaner and should be good to go.
----
New commits:
||[http://git.sagemath.org/sage.git/commit/?id=79166403ba2f72a9cda9a6641a8914293d3cd2d1
7916640]||{{{Make sure tinfo is correctly linked in when needed on
Cygwin.}}}||
||[http://git.sagemath.org/sage.git/commit/?id=9acea9b4e12e69f433d269e0ff18a390ce56497e
9acea9b]||{{{Actually add the NTL patch.}}}||
--
Ticket URL: <http://trac.sagemath.org/ticket/15317#comment:17>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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