[Xapian-discuss] Problem with bindings and MinGW

[Francesco Garosi]

Message body follows:

Hi,

I'm interested in Xapian as a possible search engine for a 
Python project I'm developing. The reason why I write to you, 
is that I saw that you've been fixing bugs... so please excuse 
me if I'm bothering you: I saw no other contact on the 
xapian.org web pages.

I've been spending the last two days trying to set up Python 
bindings for the library on Win32 with MinGW/MSYS. I know, 
it's probably not your main platform, but someone might need 
it as I do, for whatever reason. The reason why it fails, I think, 
is that Xapian::Remote::open is probably not supported on 
Win32.

When I realized it, I finally managed to exclude from the 
(provided) SWIG-generated xapian_wrap.cc the unsupported 
lines, and to "gently" raise an exception when remote_open() 
is called. Here is the patch for 
python/modern/xapian_wrap.cc:

--- xapian_wrap.cc_ORIG	Fri Mar 25 16:42:49 2005
+++ xapian_wrap.cc	Fri Mar 25 17:53:18 2005
@@ -15350 +15350,2 @@
-
+// remote_open should be removed to wrap in 
Win32/MinGW32
+#ifndef NO_REMOTE_OPEN
@@ -15597,0 +15599,6 @@
+#else
+static PyObject *_wrap_remote_open(PyObject *self, 
PyObject *args) {
+    PyErr_SetString(PyExc_NotImplementedError,"No 
matching function for 'remote_open'");
+    return NULL;
+}
+#endif // NO_REMOTE_OPEN

(I hope, the web mail program will not break too many lines). 
This patch works in conjunction with a Python distutils 
styled "setup.py" script, that follows:

#!/usr/bin/env python
# setup file for xapian

import os, sys
from distutils.core import setup, Extension

XAPIAN_BASE = ""
try:
    XAPIAN_BASE = os.environ['XAPIAN_BASE']
except KeyError:
    print "warning: XAPIAN_BASE not set, use xapian-config 
to determine it"

# please do not change the lines below
EXTRA_LDFLAGS = (
    "-v -Wl,--enable-runtime-pseudo-reloc "
    "-L%(xapianbase)s/lib -lstdc++ "
    "-lxapianqueryparser -lxapian "
    % {'xapianbase': XAPIAN_BASE}).split()
EXTRA_CFLAGS = (
    "-I%(xapianbase)s/include "
    % {'xapianbase': XAPIAN_BASE}).split()

DATA_FILES = []
if sys.platform == "win32":
    df = (
        "%(xapianbase)s/bin/libxapianqueryparser-5.dll "
        "%(xapianbase)s/bin/libxapian-5.dll "
        % {'xapianbase': XAPIAN_BASE}).split()
    DATA_FILES = [('.', df)]
    EXTRA_CFLAGS.append("-DNO_REMOTE_OPEN")

setup(name="Xapian",
      version="0.8.5",
      description="Xapian bindings for Python",
      author="The Xapian Team",
      author_email="xapian at users.sourceforge.net",
      url="http://xapian.org/",
      py_modules=["xapian"],
      data_files=DATA_FILES,
      ext_modules=[
          Extension("_xapian",
                    ["xapian_wrap.cc"],
                    extra_compile_args=EXTRA_CFLAGS,
                    extra_link_args=EXTRA_LDFLAGS,
                    )]
      )

# end.

...if a user wants to build it using the standard Python build 
system, he just has to patch the .cc file, copy this script in 
the python/modern directory, set the XAPIAN_BASE 
directory to where Xapian is installed and launch "python 
setup.py build -c mingw32 install" from a command line 
there. Still don't know how to make it work on other 
platforms - the provided build system should work perfectly.

I hope this will help someone if you disclose it...

Thank you for releasing the library as open source,

F.

>>@
Risposte/Replies :
Francesco Garosi
  Office: <f.garosi at usl7.toscana.it> (++39/0577/586937)
  Home: <franz.g at infinito.it> (++39/0577/47806)

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