issue-sl-setup  OS X Installer: readline module broken

            Changes for Issue6877 to enable the readline module to use the
            native OS X editline library instead of GNU readline introduce
            a problem for OS X installer builds or other builds using
            MACOSX_DEPLOYMENT_TARGET.  The test in setup.py to determine
            whether to search for a non-system library is based solely 
            on the OS level of the build system and not the minimum
            deployment target level.  Without this patch to setup.py,
            10.3- or 10.4-targeted installer builds on 10.5 or 10.6
            will fail to search for the installer-supplied GNU readline
            *and* will be dynamically linked with the crippled
            10.4u SDK version of editline, thereby causing the readline
            module to crash on all levels of OS X.
            The patch also corrects a incorrect version test in setup.py
            that causes builds on 10.6 to be flooded with OS X deprecation
            warnings.

APPLIES     py3k, trunk, 2.6

NOTE        issue-sl-setup-py3k.txt                 py3k
            issue-sl-setup-trunk.txt                trunk
            issue-sl-setup-26.txt (this file)       2.6

diff -r a0d63f5d2c9a setup.py
--- setup.py	Thu Mar 04 17:01:40 2010 -0800
+++ setup.py	Thu Mar 04 20:45:23 2010 -0800
@@ -558,6 +558,9 @@
         do_readline = self.compiler.find_library_file(lib_dirs, 'readline')
         if platform == 'darwin':
             os_release = int(os.uname()[2].split('.')[0])
+            dep_target = sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET')
+            if dep_target and dep_target.split('.') < ['10', '5']:
+                os_release = 8
             if os_release < 9:
                 # MacOSX 10.4 has a broken readline. Don't try to build
                 # the readline module unless the user has installed a fixed
@@ -1366,7 +1380,7 @@
         if platform == 'darwin' and ("--disable-toolbox-glue" not in
                 sysconfig.get_config_var("CONFIG_ARGS")):
 
-            if os.uname()[2] > '8.':
+            if int(os.uname()[2].split('.')[0]) >= 8:
                 # We're on Mac OS X 10.4 or later, the compiler should
                 # support '-Wno-deprecated-declarations'. This will
                 # surpress deprecation warnings for the Carbon extensions,