[PATCH] [GraphWriter] Attempt to open .dot files with xdg-open/open first

[Matthias Braun]

I have it set to /Applications/GraphViz.app (from a macos "development snapshot" from graphviz.org <http://graphviz.org/> download area). The generated .ps files tended to look very strange for me (lots of whitespace so I had to zoom in before I could really see the graph).

> On Apr 14, 2015, at 2:23 PM, Adam Nemet <anemet at apple.com> wrote:
> 
> What do you set the viewer to?  dotty?  I think that before the patch this was using dot to generate the PS and then open to view.  Which is probably better than using an X11 program.
> 
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>  rL LLVM
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> http://reviews.llvm.org/D6534
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