know compilation options of a binary

Hi,
I've a binary on my redhat box : MySQL-3.23.58-1.i386.rpm
How can i know the compilation options used to compile the binaries of
this package?

I want to use some compilation options to optimize mysql (like
CFLAGS="-mcpu=i686 -march=i686 -O3 -pipe -fomit-frame-pointer" \)
but how to know if thoses options have already ben used for the
binaries in the "official" rpm package ? (in this case, recompiling from
the source would be not very useful..)

Any idea?