Patch failures using crosstool

[Daniel Kegel]

Dave wrote:
>>yes.  The greps wouldn't be needed if patch were better about
>>returning nonzero status on failed patches.
> 
> 
> patch -p1 -f --dry-run
> 
> should exit 0 if applied successfully even with fuzz...else exit 1
> 
> I haven't done too much checking to see how reliable it is though...

I think -f is the problem.  It means both "don't ask me anything"
and "never fail".  What I need instead is a flag that just means
"don't ask me any questions, but do exit with nonzero status if you
can't apply a patch".
- Dan

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