doc += a pex can contain artifacts from mult platforms, can work on mult platforms

[lahosken]

At the risk of revealing how dense I can be: I didn't know you could build a pex that contained both foo-macosx.egg and foo-linux.egg that would work on both osx and linux. I assumed you built a pex per platform.

The excellent @Yasumoto on the thread https://groups.google.com/forum/#!topic/pants-devel/9yeI4h9xu7k says "Ideally you'll have one pex, which includes dependencies for each of the platforms you need to support..." and I was enlightened.

[areitz]

Be sure to also mention the "platforms" argument to Python_binary -- this
is how you tell pants which platform specific eggs to mix into the pex.

On Tuesday, October 7, 2014, Larry Hosken notifications@github.com wrote:

At the risk of revealing how dense I can be: I didn't know you could build
a pex that contained both foo-macosx.egg and foo-linux.egg that would work
on both osx and linux. I assumed you built a pex per platform.

The excellent @Yasumoto https://github.com/Yasumoto on the thread
https://groups.google.com/forum/#!topic/pants-devel/9yeI4h9xu7k says
"Ideally you'll have one pex, which includes dependencies for each of the
platforms you need to support..." and I was enlightened.

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#16.

[kwlzn]

this should now be covered by the help output in pex.