On 8/20/24 1:23 PM, ralfconn wrote: > Hello, > > my 8-year old gentoo HTPC is giving clear signals that the motherboard > is about to die so I ordered new components. > > The dying box is an AMD FX-6530 built with -march=native. The new box > will be Ryzen 7 5800X. > > I'd like to rebuild the dying boxwith some more generic -march option so > that I'll be able to boot into the new box and then rebuild it with more > optimized -march. > > If I understand well the GCC man page the safest option for the dying > system rebuild would be -march=x86_64 (and maybe -mtune=generic?). Is > this right?
The other safe option is to run `ld.so --help` and check for this: Subdirectories of glibc-hwcaps directories, in priority order: x86-64-v4 x86-64-v3 (supported, searched) x86-64-v2 (supported, searched) Your new CPU should support -march=x86-64-v3 but perhaps the old one doesn't. If you plan to recompile all packages with -march=native immediately after you swap anyway, then it doesn't really matter, just use "x86-64" for maximum compatibility. -- Eli Schwartz
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