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 Cheers, Rafael
t.patch
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