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Under Solaris, find_library can not give the correct path.
Solaris does not have /sbin/ldconfig, so _findLib_gcc is used.
def _findLib_gcc(name):
 expr = r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
 fdout, ccout = tempfile.mkstemp()
 os.close(fdout)
 cmd = 'if type gcc >/dev/null 2>&1; then CC=gcc; else CC=cc; fi;' \
 '$CC -Wl,-t -o ' + ccout + ' 2>&1 -l' + name
 try:
 f = os.popen(cmd)
 trace = f.read()
 f.close()
 finally:
 try:
 os.unlink(ccout)
 except OSError, e:
 if e.errno != errno.ENOENT:
 raise
 res = re.search(expr, trace)
 if not res:
 return None
 return res.group(0)
I executed these code manually, and after ‘trace = f.read()‘, I printed
the content of 'trace', which was just as following:
Undefined			first referenced
 symbol 			 in file
main /usr/lib/crt1.o
ld: fatal: symbol referencing errors. No output written to /tmp/tmpYN85Fm
collect2: ld returned 1 exit status

I tested the command 'gcc -Wl,-t' on Ubuntu, it works fine.
But on Solaris, it doesn't work as expected.
Finally I find that gcc does not use GNU ld on Solaris, instead, it uses
SUN ld.

On Solaris, we can use crle to find system library path.
Attached a patch to get find_library work with Solaris.

Above patch failed in a TabError.
Attached a new one.

Under Ubuntu 11.04 is the _findLib_gcc used and not a ldconfig method.
Why should I install a gcc only to find a dynamic library ? It seems not a well design. The usage of ldconfig, what is more natural at a server in the net than a c compiler. Perhaps it can be changed in the next version, because I can see that on other os th ldconfig method would be preferred.
I'm not an python programmer and have not the possibilities to make a regeression test, thats why I can not help.

Is there still time to get this bug fixed in 2.7.3? I patched my 2.7 ctypes/util.py with the latest version (offset a few lines, but no other problems) and verified that it seems to fix the issue. When running util.py as a main program I see this before running patch:
% python /opt/TWWfsw/python27/lib/python2.7/ctypes/util.py
None
None
None
<CDLL 'libm.so', handle fed807b8 at 82c320c>
<CDLL 'libcrypt.so', handle feb703a8 at 82c320c>
None
After applying the patch:
% python /opt/TWWfsw/python27/lib/python2.7/ctypes/util.py
libm.so.2
libc.so.1
libbz2.so.1
<CDLL 'libm.so', handle fed807b8 at 82c296c>
<CDLL 'libcrypt.so', handle feb703a8 at 82c296c>
libcrypt_d.so.1

New changeset d76fb24d79c3 by Benjamin Peterson in branch '2.7':
fix find_library on Solaris (closes #5289)
http://hg.python.org/cpython/rev/d76fb24d79c3
New changeset 73574de2068b by Benjamin Peterson in branch '3.3':
fix find_library on Solaris (closes #5289)
http://hg.python.org/cpython/rev/73574de2068b
New changeset 640a80adb9df by Benjamin Peterson in branch 'default':
merge 3.3 (#5289)
http://hg.python.org/cpython/rev/640a80adb9df