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When compiling modules under Solaris, distutils generates directories like "build/lib.solaris-2.10-i86pc-3.2". The "i86pc" part is the same both in 32 and 64 bits.
So when building 32 and 64 bit C code, the binaries are mixed and the best result you can get is something like:
"""
ImportError: ld.so.1: python: fatal: /home/pybsddb/build/lib.solaris-2.10-i86pc-2.7/bsddb3/_pybsddb.so: wrong ELF class: ELFCLASS64
"""
In other platforms, bitness is correctly detected and included in the directory name.
Since Solaris is explicitly managed in the sourcecode ("distutils.util.get_platform()"), adding "platform.architecture()[0]" in the directory name seems trivial.
I think this patch should be applied to 2.6 and 3.1, unless they are open only for security fixes.

Proposed patch for Python 2.7:
"""
--- util.py.old 2011年12月12日 01:34:04.412234183 +0100
+++ util.py 2012年01月17日 15:15:23.262257886 +0100
@@ -12,6 +12,7 @@
 from distutils.spawn import spawn
 from distutils import log
 from distutils.errors import DistutilsByteCompileError
+import platform
 
 def get_platform ():
 """Return a string that identifies the current platform. This is used
@@ -76,6 +77,7 @@
 if release[0] >= "5": # SunOS 5 == Solaris 2
 osname = "solaris"
 release = "%d.%s" % (int(release[0]) - 3, release[2:])
+ machine += ".%s" %platform.architecture()[0]
 # fall through to standard osname-release-machine representation
 elif osname[:4] == "irix": # could be "irix64"!
 return "%s-%s" % (osname, release)
"""
So now the directory is named like "lib.solaris-2.10-i86pc.32bit-2.7".
Please, review.
I will commit it to 2.7, 3.1, 3.2 and 3.3 in a few days.

OK.
 from distutils.spawn import spawn
 from distutils import log
 from distutils.errors import DistutilsByteCompileError
+import platform
Please put that import higher up (with the other "import X", before the "from X import Y").
 
+ machine += ".%s" %platform.architecture()[0]
One space after the % operator please.
> I will commit it to 2.7, 3.1, 3.2 and 3.3 in a few days.
Not to 3.1, this is not a security issue.

New changeset 284550d0d8ae by Jesus Cea in branch '2.7':
Closes #13803: Under Solaris, distutils doesn't include bitness in the directory name
http://hg.python.org/cpython/rev/284550d0d8ae
New changeset eed73b16e71f by Jesus Cea in branch '3.2':
Closes #13803: Under Solaris, distutils doesn't include bitness in the directory name
http://hg.python.org/cpython/rev/eed73b16e71f
New changeset 8d0ccb4ad206 by Jesus Cea in branch 'default':
MERGE: Closes #13803: Under Solaris, distutils doesn't include bitness in the directory name
http://hg.python.org/cpython/rev/8d0ccb4ad206 

New changeset 2ec4ab2a6f65 by Jesus Cea in branch '2.7':
Emergency fix for #13803 bootstrap issue: Under Solaris, distutils doesn't include bitness in the directory name
http://hg.python.org/cpython/rev/2ec4ab2a6f65
New changeset 9d62f5aa35ff by Jesus Cea in branch '3.2':
Emergency fix for #13803 bootstrap issue: Under Solaris, distutils doesn't include bitness in the directory name
http://hg.python.org/cpython/rev/9d62f5aa35ff
New changeset 4a6e0b6d493b by Jesus Cea in branch 'default':
MERGE: Emergency fix for #13803 bootstrap issue: Under Solaris, distutils doesn't include bitness in the directory name
http://hg.python.org/cpython/rev/4a6e0b6d493b 

New changeset 4074439c3894 by Jesus Cea in branch '2.7':
Yet another emergency fix for #13803 bootstrap issue: Under Solaris, distutils doesn't include bitness in the directory name
http://hg.python.org/cpython/rev/4074439c3894
New changeset 37efae3bf912 by Jesus Cea in branch '3.2':
Yet another emergency fix for #13803 bootstrap issue: Under Solaris, distutils doesn't include bitness in the directory name
http://hg.python.org/cpython/rev/37efae3bf912
New changeset afdce2e2f98d by Jesus Cea in branch 'default':
MERGE: Yet another emergency fix for #13803 bootstrap issue: Under Solaris, distutils doesn't include bitness in the directory name
http://hg.python.org/cpython/rev/afdce2e2f98d 

A trivial check-in causing a nightmare at 5AM just hours before a day-long offline trip :-).
Eric, could you possibly review the committed version?. I can't use "platform.architecture()" because bootstrap issues. For instance: http://www.python.org/dev/buildbot/all/builders/x86%20OpenIndiana%202.7/builds/828/steps/compile/logs/stdio
Moreover, there are function redundancy between "distutils/util.py" and "sysconfig.py", and the return value must be consistent. This is just created issue13813.

New changeset 147ad02875fa by Jesus Cea in branch '3.2':
And yet another emergency fix for #13803 bootstrap issue: Under Solaris, distutils doesn't include bitness in the directory name
http://hg.python.org/cpython/rev/147ad02875fa
New changeset 582274636446 by Jesus Cea in branch 'default':
MERGE: And yet another emergency fix for #13803 bootstrap issue: Under Solaris, distutils doesn't include bitness in the directory name
http://hg.python.org/cpython/rev/582274636446 

Final code looks OK to me.