Can I set CFLAGS="-march=broadwell" optimizations in /etc/makepkg.conf

Hi
does the Arch Build System allow the new compiler optimizations
-march=broadwell
to be set as CFLAGS and CXXFLAGS in /etc/makepkg.conf?
I recently installed Arch on a machine having this processor (an Intel Broadwell NUC) and I was wondering if I should change CFLAGS from the generic "x86-64" to the more specific broadwell setting. As far as I understood gcc > 4.9 does support this.
What else needs to be adjusted in Arch in order to use this optimizations?
Thanks
gen2arch

Thanks everyone for your input!
graysky: actually the linux kernel is exactly the package in view of which I was looking into the Arch Build System; having come over from gentoo, I thought it would be a good idea to streamline the generic arch kernel and, in the process, apply processor specific optimizations. So your point that precisely the kernel doesn't honor these settings is indeed very helpful!
Against which sources do I have to apply your patch: actually, where can I download the source package of Arch linux' own kernel build?
Thanks again
gen2arch

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- I want the join/quit text (... has joined/quit) in gray
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all without any luck. Also tried to put the format strings outside the curly braces, with the same result. I've been editing the config file for a while now, not sure what other information could you possibly need.
I know it's not a big deal, I stil can use the program with no hassle, but it would really be nice to set the colors like that, to help me distinguish between lines.
Thank you for reading, and sorry for my lousy english

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