[Swift-devel] CLASSPATH construction order

[Ben Clifford]

The bin/swift wrapper currently constructs a classpath for swift 
automatically, as whatever is already on the classpath in the current 
environment followed by all of the swift classes.

This order seems to cause more problems than it solves - specifically, 
when there are overlapping classes specified in the environment (which I 
have seen with falkon and pegasus users, and potentially is also a problem 
for people with the Globus Toolkit installed).

I think it would be better to construct the classpath the other way round. 
This would remove the ability for people to override internal Swift 
classes by presetting classpath, which, in the above cases, happens 
accidentally and produces obscure errors.

If there is a desire to still be able to override swift classes from the 
environment, which I think there is not, then another Swift specific 
environment variable should be used for the prefix.

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