[PATCH] Option parsing: recognize the special -- token

[Chandler Carruth]

On Fri, Aug 2, 2013 at 1:56 PM, Reid Kleckner <rnk at google.com> wrote:

> This could be a breaking behavior change for people who expect clang to
> parse args after --.  They're crazy, of course, but you should ask Chandler
> if changing this for all driver modes is OK.


I hope none have built up such a dependency. To me, it is essential that
all the drivers work as this patch makes them. I actually wonder if this
was a regression when we switched to the common parsing implementation. (It
seems unlikely).

GCC-compatibility cannot be impacted by this because passing '--' to GCC
results in a hard error.

So I think we should make this change, and see if anyone screams. We should
also probably file a bug against GCC to get them to implement equivalent
behavior.
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