Patches item #1685563, was opened at 2007-03-21 18:05
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Category: Distutils and setup.py
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Scott Dial (geekmug)
Assigned to: Nobody/Anonymous (nobody)
Summary: MSVCCompiler creates redundant and long PATH strings

Initial Comment:
The current code in MSVCCompiler.initialiaze will throw  an OSError on the 
assignment to os.environ['path'] after repeated usages of MSVCCompilers because 
the string produced may exceeed 4096 characters (usually after several 
compilations). In the call to initialize, the needed paths for compiling via 
the compiler selected are added on to the front of the path regardless of what 
the current path is set to be. This is bad because we could be adding redundant 
paths (and thus exceeding the 4096 character limit needlessly)

Furthmore, this happens regularly whenever anyone uses the VCToolkit2003 
compiler because you end up in the "if self.__version >= 7:" control path of 
get_msvc_paths which merely returns the current path back to the callee. This 
results in initialize /duplicating the entire path/.

The proposed patch adds a pass through the new path that removes duplicates 
while maintaining the ordering.

Unfortunately it is difficult for me to provide a real test case for this as it 
arises out of trying to run the translate code with PyPy. However, I hope that 
the change is obviously fixing a bug that I've made clear exists.


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