Building GMP 6.0 for Ivy Bridge

Marc Glisse marc.glisse at
Fri Oct 2 06:24:21 UTC 2015

On Thu, 1 Oct 2015, Victor Shoup wrote:

> I tried the latest daily snapshot and ran "./configure".
> I get:
> Host type:         x86_64-unknown-linux-gnu

Hmm, I would have expected config.guess to 
return ivybridge-unknown-linux-gnu.

> So I guess GMP's "automagic" is not working as well as one would hope.
> Let me know if there is some config patch you want me to try.

In config.guess, if you look for the string ivybridge, you'll find a C 
program that determines your processor type from variables family, model, 
cpuid_64bit, cpu_64bit, cpu_avx, etc. It would help if you could print 
those variables and send us the result.

By the way, I hope you are not using any virtualization / emulation? Those 
tend to mess with CPU identification.

Marc Glisse

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