[Interest] good-compromise compatibility setting for -march=??? option (x86)?

[Rainer Wiesenfarth]

Addendum: According to https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html,
"-march=nehalem" or "-march=sandybridge" should do the trick. Both do not
have RDRND instruction set support, as René already noted.

Cheers, Rainer

On Tue, Jul 21, 2020 at 6:50 AM Rainer Wiesenfarth <
rainer_wiesenfarth at trimble.com> wrote:

> Sorry for jumping into your discussion, but I think you are talking about
> different topics.
>
> René would like to know how to set "march" when he *compiles code on* the
> Celeron (N3150) that should *run on* the (probably first generation) Core
> i7 mobile.
>
> Thiago says that "march=native" produces code that is guaranteed to run on
> the *same architecture.*
>
> My guess would be that René has to set "march" to what the i7 supports,
> using sde64 searching for Nehalem or - eventually - Sandy Bridge. As I am
> on AMD and Windows, it might be Thiago's part to provide the sde64
> information... :-)
>
> Cheers, Rainer
>
> --
> Software Engineer | Trimble Imaging Division
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>
> Trimble Germany GmbH, Am Prime Parc 11, 65479 Raunheim
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-- 
Software Engineer | Trimble Imaging Division
Rotebühlstraße 81 | 70178 Stuttgart | Germany
Office +49 711 22881 0 | Fax +49 711 22881 11
http://www.trimble.com/imaging/ | http://www.inpho.de/

Trimble Germany GmbH, Am Prime Parc 11, 65479 Raunheim
Eingetragen beim Amtsgericht Darmstadt unter HRB 83893,
Geschäftsführer: Rob Reeder, Jürgen Kesper
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