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"""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()
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