A script to fix Apple-installed Python 2.3 (and a test whether the user
needs to run it in the Makefile).
After installing a newer framework Python the apple-installed Python can
no longer build extension modules, because they will inadvertantly be linked
against the newer framework. This script modifies lib/config/Makefile so
it will link extensions with "-undefined dynamic_lookup", which forestalls
this problem.
Will backport to 2.4 and 2.3.
diff --git a/Mac/OSX/fixapplepython23.py b/Mac/OSX/fixapplepython23.py
new file mode 100644
index 0000000..4547347
--- /dev/null
+++ b/Mac/OSX/fixapplepython23.py
@@ -0,0 +1,95 @@
+"""fixapplepython23 - Fix Apple-installed Python 2.3 (on Mac OS X 10.3)
+
+Python 2.3 (and 2.3.X for X<5) have the problem that building an extension
+for a framework installation may accidentally pick up the framework
+of a newer Python, in stead of the one that was used to build the extension.
+
+This script modifies the Makefile (in .../lib/python2.3/config) to use
+the newer method of linking extensions with "-undefined dynamic_lookup"
+which fixes this problem.
+
+The script will first check all prerequisites, and return a zero exit
+status also when nothing needs to be fixed.
+"""
+import sys
+import os
+import gestalt
+
+MAKEFILE='/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/config/Makefile'
+OLD_LDSHARED='LDSHARED=\t$(CC) $(LDFLAGS) -bundle -framework $(PYTHONFRAMEWORK)\n'
+OLD_BLDSHARED='B' + OLD_LDSHARED
+NEW_LDSHARED='LDSHARED=\t$(CC) $(LDFLAGS) -bundle -undefined dynamic_lookup\n'
+NEW_BLDSHARED='B' + NEW_LDSHARED
+
+def findline(lines, start):
+ """return line starting with given string or -1"""
+ for i in range(len(lines)):
+ if lines[i][:len(start)] == start:
+ return i
+ return -1
+
+def fix(makefile, do_apply):
+ """Fix the Makefile, if required."""
+ fixed = False
+ lines = open(makefile).readlines()
+
+ i = findline(lines, 'LDSHARED=')
+ if i < 0:
+ print 'fixapplepython23: Python installation not fixed (appears broken, no LDSHARED)'
+ return 2
+ if lines[i] == OLD_LDSHARED:
+ lines[i] = NEW_LDSHARED
+ fixed = True
+ elif lines[i] != NEW_LDSHARED:
+ print 'fixapplepython23: Python installation not fixed (appears modified, unexpected LDSHARED)'
+ return 2
+
+ i = findline(lines, 'BLDSHARED=')
+ if i < 0:
+ print 'fixapplepython23: Python installation not fixed (appears broken, no BLDSHARED)'
+ return 2
+ if lines[i] == OLD_BLDSHARED:
+ lines[i] = NEW_BLDSHARED
+ fixed = True
+ elif lines[i] != NEW_BLDSHARED:
+ print 'fixapplepython23: Python installation not fixed (appears modified, unexpected BLDSHARED)'
+ return 2
+
+ if fixed:
+ if do_apply:
+ print 'fixapplepython23: Fix to Apple-installed Python 2.3 applied'
+ os.rename(makefile, makefile + '~')
+ open(makefile, 'w').writelines(lines)
+ return 0
+ else:
+ print 'fixapplepython23: Fix to Apple-installed Python 2.3 should be applied'
+ return 1
+ else:
+ print 'fixapplepython23: No fix needed, appears to have been applied before'
+ return 0
+
+def main():
+ # Check for -n option
+ if len(sys.argv) > 1 and sys.argv[1] == '-n':
+ do_apply = False
+ else:
+ do_apply = True
+ # First check OS version
+ if gestalt.gestalt('sysv') < 0x1030:
+ print 'fixapplepython23: no fix needed on MacOSX < 10.3'
+ sys.exit(0)
+ # Test that a framework Python is indeed installed
+ if not os.path.exists(MAKEFILE):
+ print 'fixapplepython23: Python framework does not appear to be installed (?), nothing fixed'
+ sys.exit(0)
+ # Check that we can actually write the file
+ if do_apply and not os.access(MAKEFILE, os.W_OK):
+ print 'fixapplepython23: No write permission, please run with "sudo"'
+ sys.exit(2)
+ # And finally fix it
+ rv = fix(MAKEFILE, do_apply)
+ sys.exit(rv)
+
+if __name__ == '__main__':
+ main()
+