Ubuntu x64 Build Options

[Null Ack]

Hi everyone :)

I was reading on a blog about some drastic performance gains a bloke
got from recompiling various bits of his video software with GCC
compiler options optimised for his CPU. The results were good. This
got me curious:

1. What compiler options are used for compiling official Ubuntu x64 packages?
2. Is it possible to query a compiled program to identify the compile
options used?

I know that video algorithms in particular are sped up by sse4 and so on.

Many thanks