[PATCH] D86089: [flang][driver]Add experimental flang driver and frontend with help screen

[Richard Barton via Phabricator via cfe-commits]

richard.barton.arm added a comment.

Another random thought that just came to me: what does the new driver do when you invoke it with no input files or options? I could imagine a few sensible outcomes (error: no input (clang and gcc/gfortran behaviour), print version and exit, print help and exit, etc.) and I don't have a strong preference over which we chose here but I think there should be a test for it in test/Driver


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