[Python-Dev] PyObject_GenericGetAttr vs cygwin

Thu, 8 Nov 2001 15:20:52 -0500

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Michael,

On Thu, Nov 08, 2001 at 01:52:01PM -0500, Michael Hudson wrote:
> It works.  Do you want to see the patches or shall I just check the
> changes in?

If they are just the standard "PyObject_HEAD_INIT(NULL)" style fix, then
please just commit them.

> BTW, _cursesmodule.c doesn't compile; you get things like:
> 
> Warning: resolving _stdscr by linking to __imp__stdscr (auto-import)
> [snip]
> build/temp.cygwin-1.3.3-i686-2.2/_cursesmodule.o: In function `PyCurses_InitScr':
> /cygdrive/c/src/python/dist/src/Modules/_cursesmodule.c:1842: undefined reference to `acs_map'
> [snip]

I'm getting a feeling of deja vu from the above, but I can't quite
remember...  I believe that the above is related to the auto-import
features recently added to Cygwin's binutils.  Please send me your

    /etc/setup/installed.db

via private email.  In the meantime, I will dig some on my own.

> and contrary to README,

The Cygwin section of Python README has become stale -- I need to submit
a doco patch.  Sigh...

> test_poll

The test_poll problem was fixed by:

    http://sources.redhat.com/ml/cygwin-patches/2001-q3/msg00109.html

and released in Cygwin 1.3.4.

> and threads seem to work fine.

There is still one known Cygwin pthreads hang.  If interested, see the
following for the current state of affairs:

   http://sources.redhat.com/ml/cygwin-developers/2001-10/msg00193.html

> test_strftime is still bust, though:

The test_strftime problem was fixed by:

    http://sources.redhat.com/ml/newlib/2001/msg00504.html

and released in Cygwin 1.3.4.

I've attached the latest README, since it is the most complete description
of the current state.

Thanks,
Jason

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$Id: README,v 1.10 2001/09/26 13:28:31 jt Exp $

Abstract:

This is the README for the Cygwin Python distribution.

As of Python 2.1, Cygwin Python is built with a DLL core very similar
to how Win32 Python is built.  This enables Cygwin Python to support
building shared extensions with the traditional Misc/Makefile.pre.in
and the newer distutils methods.

As of Python 2.1.1-2, the Cygwin Python port is essentially complete (at
least for Windows NT 4.0 and 2000).  The most notable changes are the
addition of the _tkinter module and the elimination of the test_poll hang.

I was tempted to enable threading in the 2.1.1-2 release too.
Unfortunately, there is still one known problem with Cygwin's pthreads
support.  So, I opted for the more prudent choice which is to continue
to disable threading until this problem is resolved.  See the issues
section for more details, if interested.

Requirements:

The following packages or later are required to build and/or execute
Cygwin Python:

    Cygwin 1.3.3-2
    gcc 2.95.3-1

The following packages or later are required to build and/or execute
some of the standard Cygwin Python extension modules:

    gdbm-1.8.0-3     (gdbm)
    ncurses-5.2-5    (_curses and _curses_panel)
    readline 4.2-3   (readline)
    zlib 1.1.3-6     (zlib)
    tcltk-20001125-1 (_tkinter)

Install:

Cygwin Python does not require any special installation procedures.
However, to use the _tkinter module you must define the following
environment variables:

    $ export TCL_LIBRARY=$(cygpath -w /usr/share/tcl8.0)
    $ export TK_LIBRARY=$(cygpath -w /usr/share/tk8.0)

since tcltk-20001125-1 is a native Win32 (i.e., not Cygwin) application.

Source:

The Python source builds OOTB under Cygwin.  However, there are a few
minor issues so the source has been patched to correct them.

The following patches have been submitted to Python CVS:

    http://sourceforge.net/tracker/index.php?func=detail&aid=429442&group_id=5470&atid=305470
    http://sourceforge.net/tracker/index.php?func=detail&aid=443669&group_id=5470&atid=305470
    http://sourceforge.net/tracker/index.php?func=detail&aid=459385&group_id=5470&atid=305470
    http://sourceforge.net/tracker/index.php?func=detail&aid=462255&group_id=5470&atid=305470
    http://sourceforge.net/tracker/index.php?func=detail&aid=462258&group_id=5470&atid=305470

for consideration and have been accepted into Python CVS.  Hence, these
minor issues will be resolved in Python 2.2.

I also added the following files to the source archive:

    CYGWIN-PATCHES/README
    CYGWIN-PATCHES/build.sh
    CYGWIN-PATCHES/python.patch

and renamed the original source archive to match Cygwin's setup.exe
naming conventions.

To restore the Python source to its original state, perform the following:

    $ cd python-2.1.1
    $ patch -R -p1 <CYGWIN-PATCHES/python.patch
    $ autoconf
    $ rm -fr CYGWIN-PATCHES

Build:

This distribution has been configured as follows:

    configure --prefix=/usr

See CYGWIN-PATCHES/build.sh in the source archive for my exact build
recipe for configuring, making, and packaging this distribution.

Test:

On NT/2000, Cygwin Python passes all tests.  Use the following to run the
regression test:

    $ make test

On 9X/Me, Cygwin Python hangs in test_select and test_socket fails.  Use the
following to run the regression test:

    $ make TESTOPTS='-l -x test_select' test

Note that the above 9X/Me regression test results has been reported to me.
I do not have access to 9X/Me so I cannot verify this behavior myself.

Issues:

The following are the known Cygwin Python issues:

1. On all platforms, the test_strftime regression test fails due to a bug in
newlibs's strftime().  See the following for details:

    http://sources.redhat.com/ml/newlib/2001/msg00504.html

This bug has been corrected in the Cygwin 2001-Sep-13 snapshot.  So,
upgrade to this snapshot, Cygwin 1.3.4, or later if this affects you.

2. On 9X/ME, the regression test test_select hangs and test_socket fail.

3. The _tkinter extension module will only be built if the X11 header files
from the tcltk-20001125-1 source archive have been copied to /usr/include:

    $ mkdir -p /usr/include/X11
    $ tar -xzf tcltk-20001125-1-src.tar.gz
    $ cp tcltk-20001125-1/tk/xlib/X11/*.h /usr/include/X11

4. Although Cygwin Python builds OOTB with threading enabled, there is a known
but non-trivial to fix race condition in Cygwin's pthreads support.  Hence, I
have decided to continue to disable threading until this problem is corrected.
If interested, see the following mailing list thread for the gory details:

    http://www.cygwin.com/ml/cygwin/2001-09/msg01543.html

Homepage:

The primary Python web site is:

    http://www.python.org/

Download:

The primary Python ftp site is:

    ftp://ftp.python.org/pub/python/

Mailing Lists:

Please report problems, suggestions, etc. dependent on their nature to one of
the following:

    python-list@python.org
    cygwin@sources.redhat.com

Maintainer:

    Jason Tishler <jason@tishler.net>

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