kbuild, LLVMLinux: Add -Werror to cc-option to support clang
Clang will warn about unknown warnings but will not return false unless -Werror is set. GCC will return false if an unknown warning is passed. Adding -Werror make both compiler behave the same. [arnd: it turns out we need the same patch for testing whether -ffunction-sections works right with gcc. I've build tested extensively with this patch applied, so let's just merge this one now.] Signed-off-by: NMark Charlebois <charlebm@gmail.com> Signed-off-by: NBehan Webster <behanw@converseincode.com> Reviewed-by: NJan-Simon Möller <dl9pf@gmx.de> Signed-off-by: NArnd Bergmann <arnd@arndb.de> Acked-by: NKees Cook <keescook@chromium.org> Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
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