[patch] Fix pr9701

[Richard Smith]

What about -munknown-to-clang-option? We really want an error on those
ones, since they can change the ABI.


On Tue, Sep 3, 2013 at 4:35 PM, Eli Friedman <eli.friedman at gmail.com> wrote:

> On Tue, Sep 3, 2013 at 9:31 AM, Rafael Espíndola <
> rafael.espindola at gmail.com> wrote:
>
>> The attached patch fixes pr9701. It was marked wontfix, but I could
>> not find why.
>>
>> Requiring -Werror=unknown-warning-option is a fairly annoying behavior
>> difference from gcc.
>>
>> Before this patch:
>>
>> $ clang -HHH -c test.c; echo $?
>> clang: warning: argument unused during compilation: '-HHH'
>> 0
>>
>> with this patch:
>>
>> $ clang -HHH -c test.c; echo $?
>> clang-3.4: error: unknown argument: '-HHH'
>> 1
>>
>> Does this affect -funknown-to-clang-option?  -Wunknown-to-clang-option?
>  Any other potentially interesting cases?  The testcase is a bit lacking.
>
> -Eli
>
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