Re: [PATCH 2/2] gnu: zita-convolver: Drop the '-march=native' optimization.

[iyzsong@member.fsf.org (宋文武)]

Ricardo Wurmus <rekado@elephly.net> writes:

>> +              (snippet
>> +               ;; Don't optimize for a specific processor architecture.
>> +               '(substitute* "libs/Makefile"
>> +                  (("^CXXFLAGS \\+= -march=native") "")))
>> +              (modules '((guix build utils)))
>
> Is this to avoid that packages are optimised for the CPU of the build
> slave?
Yes, using that from hydra will crash guitarix for me.
Same as: <https://bugs.archlinux.org/task/36248>.

> If so, could we instead pass different optimisation flags for
> different architectures?  For a convolver I’d prefer to have *some*
> optimisation, even if it’s just the greatest common divisor.
I don't familiar with optimization flags, but according to:
  <https://wiki.gentoo.org/wiki/GCC_optimization#Optimizing>
I think '-march=native' should be dropped definitely, it enable all
the CPU specified instruction set when building on the slave.
And it's not clear to me what *some* flags are, suppose we don't want
any CPU specified (-msse3, -msse4, etc.) thing.