Re: [gentoo-user] Migrating existing Gentoo to binpkg

[Matt Jolly <kangie@gentoo.org>]

Hi,

> Since I'm planning to use binary packages from x86-64-v3, I presume this 
> should be changed to:
> 
>      COMMON_FLAGS="-march=x86-64-v3 -O2 -pipe"
> 
> or, perhaps:
> 
>      COMMON_FLAGS="-march=x86-64-v3 -mtune=znver4 -O2 -pipe" ?

You want to match the binhost flags:

https://wiki.gentoo.org/wiki/Gentoo_Binary_Host_Quickstart#x86-64-v3_variant


> I also have a hefty $CPU_FLA
> GS_X86 (also added to $USE) from "cpuid2cpuflags" but am not worried 
> about this as packages that don't fit will simply be built from source 
> as usual.

You could also match with the flags the binhost has if you want to avoid
compilation altogether. See above.

> 1) What would be the preferred CFLAGS configuration

See above.

> 2) To reinstall the current source based packages with their binary 
> equivalent, "--rebuilt-binaries" sufficient or should I just go for "-- 
> emptytree @world"?
> 

If you're currently using x86-64-v4 there's no benefit to replacing the
existing packages. Just let them age out and be replaced over time as
as new versions are released.

Cheers,

Matt