[gentoo-user] gcc 4.2 and Core 2 Duo

[Andrew Gaydenko]

I have noticed, the official portage tree has included gcc 4.2. Now for 
Core 2 Duo CPU (amd64 Gentoo arch) I use in make.conf file:

CFLAGS="-O2 -march=nocona -pipe"

gcc' changelog has this note:

--------------------
...
IA-32/x86-64

    * -mtune=generic can now be used to generate code running well on common 
x86 chips. 
      This includes AMD Athlon, AMD Opteron, Intel Pentium-M, Intel Pentium 4 
and Intel
      Core 2.
    * -mtune=native and -march=native will produce code optimized for the host 
      architecture as detected using the cpuid instruction.
...
--------------------

The question is: must I replace '-march=nocona' with '-mtune=native and 
-march=native'?
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