backout 66e30c4870bb for breaking OSX (#13150)

sysconfig.py

@@ -387,11 +387,66 @@ _config_vars = None
 
 def _init_posix():
     """Initialize the module as appropriate for POSIX systems."""
-    # _sysconfigdata is generated at build time, see the sysconfig module
-    from _sysconfigdata import build_time_vars
+    g = {}
+    # load the installed Makefile:
+    try:
+        filename = get_makefile_filename()
+        parse_makefile(filename, g)
+    except IOError, msg:
+        my_msg = "invalid Python installation: unable to open %s" % filename
+        if hasattr(msg, "strerror"):
+            my_msg = my_msg + " (%s)" % msg.strerror
+
+        raise DistutilsPlatformError(my_msg)
+
+    # load the installed pyconfig.h:
+    try:
+        filename = get_config_h_filename()
+        parse_config_h(file(filename), g)
+    except IOError, msg:
+        my_msg = "invalid Python installation: unable to open %s" % filename
+        if hasattr(msg, "strerror"):
+            my_msg = my_msg + " (%s)" % msg.strerror
+
+        raise DistutilsPlatformError(my_msg)
+
+    # On AIX, there are wrong paths to the linker scripts in the Makefile
+    # -- these paths are relative to the Python source, but when installed
+    # the scripts are in another directory.
+    if python_build:
+        g['LDSHARED'] = g['BLDSHARED']
+
+    elif get_python_version() < '2.1':
+        # The following two branches are for 1.5.2 compatibility.
+        if sys.platform == 'aix4':          # what about AIX 3.x ?
+            # Linker script is in the config directory, not in Modules as the
+            # Makefile says.
+            python_lib = get_python_lib(standard_lib=1)
+            ld_so_aix = os.path.join(python_lib, 'config', 'ld_so_aix')
+            python_exp = os.path.join(python_lib, 'config', 'python.exp')
+
+            g['LDSHARED'] = "%s %s -bI:%s" % (ld_so_aix, g['CC'], python_exp)
+
+        elif sys.platform == 'beos':
+            # Linker script is in the config directory.  In the Makefile it is
+            # relative to the srcdir, which after installation no longer makes
+            # sense.
+            python_lib = get_python_lib(standard_lib=1)
+            linkerscript_path = string.split(g['LDSHARED'])[0]
+            linkerscript_name = os.path.basename(linkerscript_path)
+            linkerscript = os.path.join(python_lib, 'config',
+                                        linkerscript_name)
+
+            # XXX this isn't the right place to do this: adding the Python
+            # library to the link, if needed, should be in the "build_ext"
+            # command.  (It's also needed for non-MS compilers on Windows, and
+            # it's taken care of for them by the 'build_ext.get_libraries()'
+            # method.)
+            g['LDSHARED'] = ("%s -L%s/lib -lpython%s" %
+                             (linkerscript, PREFIX, get_python_version()))
+
     global _config_vars
-    _config_vars = {}
-    _config_vars.update(build_time_vars)
+    _config_vars = g
 
 
 def _init_nt():