Hi,
I find where the problem is.
ctypes.util.find_library uses following command to find the library
name:
gcc -Wl,-t -o xxx -lxxx
I tested this on Ubuntu, it will output some messages including library
names. But on Solaris, it does not.
The reason is that gcc on Solaris actually does not use GNU ld as the
linker. Instead, it uses SUN ld.
Different linker generates different messages, this makes find_library
does not work correctly.
Regards,
Ke
On Tue, 2009-02-17 at 19:17 +0900, Takao Fujiwara - Tokyo S/W Center
wrote:
> Ke Wang-san wrote (02/17/09 05:33 PM):
> > This seems to be a bug of python.
> > ctypes.util.find_library() does not work correctly.
> > I've submitted a patch for libproxy python binding to avoid the use of
> > find_library.
> >
> > You can now try the following python sample code with python2.6:
> >
> > ////////////////////////////////////////////////////
> >
> > import libproxy
> >
> > URL = "http://www.google.com";
> >
> > pf = libproxy.ProxyFactory()
> > for proxy in pf.getProxies(URL):
> > print proxy
> >
> > ////////////////////////////////////////////////////
> >
> > I also filed a bug to bugs.python.org. The link is:
> > http://bugs.python.org/issue5289
>
> OK, thanks for your workaround. I confirmed the example program works.
>
> I read util.py now. My idea is to check LD_LIBRARY_PATH to fix
> ctypes.util.find_library() .
>
> --- /usr/lib/python2.6/ctypes/util.py.orig 2009-02-17 18:02:17.764163000
> +0900
> +++ /usr/lib/python2.6/ctypes/util.py 2009-02-17 19:09:34.251456000 +0900
> @@ -159,6 +159,9 @@
> else:
>
> def _findLib_ldconfig(name):
> + if not os.path.exists('/sbin/ldconfig'):
> + return None
> +
> # XXX assuming GLIBC's ldconfig (with option -p)
> expr = r'/[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
> res = re.search(expr,
> @@ -171,8 +174,24 @@
> return None
> return res.group(0)
>
> + def _findLib_env(name):
> + paths = os.environ.get('LD_LIBRARY_PATH')
> + if paths:
> + paths += ':/usr/lib'
> + else:
> + paths = '/usr/lib'
> +
> + for dir in paths.split(":"):
> + libfile = os.path.join(dir, "lib%s.so" % name)
> + if os.path.exists(libfile):
> + return libfile
> +
> + return None
> +
> def find_library(name):
> - return _get_soname(_findLib_ldconfig(name) or _findLib_gcc(name))
> + return _get_soname(_findLib_ldconfig(name) or
> + _findLib_env(name) or
> + _findLib_gcc(name))
>
> ################################################################
> # test code
>
>
>
> >
> > Regards,
> >
> > Ke
> >
> >
> >
>
