architecture level argument for x86_64 not liked

[Reinoud Koornstra]

Hi Everyone,

In target option I selected x86
Bitness: 64 bit.
Is there a value I can fill out for the architecture level?
The values suggested here:

https://gcc.gnu.org/onlinedocs/gcc/i386-and-x86-64-Options.html#i386-and-x86-64-Options

for march aren't known (nehalem etc), the options for mtune (generic
or intel) or stumble upon problems.
for arm I can just set a arm cpu type without problems, not for x86_64.
Any advice?
Thanks,

Reinoud.

--
For unsubscribe information see http://sourceware.org/lists.html#faq