Issue1837

gderived.py fails on a Python 2.x Windows platform because os.path.samefile is not supported. This prevents the development of new built-in types. The templates section of "ant template" fails like this:
template-init:
    [javac] .\build.xml:476: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
    [javac] Compiling 1 source file to .\build\classes

template:
 [gentempl] executing: python .\src\templates\gexpose.py --lazy
 [gentempl] executing: python .\src\templates\gderived.py --lazy
 [gentempl] Traceback (most recent call last):
 [gentempl]   File ".\src\templates\gderived.py", line 251, in <module>
 [gentempl] Processing .\src\templates\ast_Subscript.derived into .\src\org\python\antlr\ast\SubscriptDerived.java
 [gentempl]     process(mapping[0], mapping[1], lazy)
 [gentempl]   File ".\src\templates\gderived.py", line 206, in process
 [gentempl]     result = hack_derived_header(outfile, result)
 [gentempl]   File ".\src\templates\gderived.py", line 215, in hack_derived_header
 [gentempl]     if os.path.samefile(parent, core_dir):
 [gentempl] AttributeError: 'module' object has no attribute 'samefile'

I've replaced the (rather long) absolute path to the root of the project by "." in this dump.

Patch addressing this by providing, when os.path.samefile is missing, a sunstitute that compares absolute paths.

I have tested this by running the ant template target to regenerate all *Derived.java files, then rebuilding successfully.

The patch seems to have been committed

http://hg.python.org/jython/rev/76b77b00a4fe

But the patch wasn't committed against 2.5?

And the NEWS file should be updated too, to say that it's fixed.

oops, my bad - will fix.