[petsc-users] Warning at the beginning of compiling

[Jed Brown]

If you want your compiler to use more aggressive optimization, e.g., -O3
-march=native, then you should pass them as

  ./configure COPTFLAGS='-O3 -march=native' --any-other-options-you-might-have

Edoardo alinovi <edoardo.alinovi at gmail.com> writes:

> Dear users,
>
> what does this warning means?
>
>  ***** WARNING: Using default FORTRAN optimization flags -g -O
>
>                                You might consider manually setting
> optimal optimization flags for your system with
>
> FOPTFLAGS="optimization flags" see config/examples/arch-*-opt.py for
> examples
>
>
> thank you very much,
>
> Edoardo