unable to compile with -march=native

[darthoctopus]

Hi Rich,

Our group has run into issues where on certain machines running older versions of linux, GYRE is not able to compile unless we either remove the compiler flag -march=native from the standard set of build options in src/build/Make.inc, or add a bunch more options to suppress particular instruction sets (in this case, passing -mno-bmi2 — see e.g. here). If we don't do this, we obtain error messages such as the following:

/tmp/cc902xwd.s:43: Error: no such instruction: 'shlx %rax,8(%rdi),%rax'
/tmp/cc902xwd.s:272: Error: no such instruction: 'shlx %rax,8(%rdi),%rax'

I've seen this happen when attempting to compile gyre_grid.f90. This has happened on the following CPUs (from /proc/cpuinfo) running linux 2.6.32:

• Intel(R) Xeon(R) CPU E5-2670 v3
• Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz

This was particularly confusing to debug because these CPUs advertise themselves as supporting the relevant instruction sets (in this case bmi2) in /proc/cpuinfo. I'm pretty sure this is not a bug with GYRE per se, but I'm leaving this here in case 1. this is indicative of some deeper underlying issue, and/or 2. someone else can benefit from this quick fix.

Best regards, Joel Ong

[rhdtownsend]

Hmm, that's weird -- march=native should compile for the current host. This is more an SDK error than a GYRE error...

[rhdtownsend]

I've just checked on a 2.6.32 system, and GYRE it compiles without issue. I'm guessing the problem lies with an especially-old binutils (assembler) installation on your system.