Re: [PATCH] build: riscv is not a valid -march value

[Bruce Richardson <bruce.richardson@intel.com>]

On Wed, Nov 22, 2023 at 05:02:56PM +0100, David Marchand wrote:
> On Tue, Nov 21, 2023 at 5:49 PM <christian.ehrhardt@canonical.com> wrote:
> >
> > From: Christian Ehrhardt <christian.ehrhardt@canonical.com>
> >
> > If building riscv natively with -Dplatform=generic config/meson.build
> > will select cpu_instruction_set=riscv.
> >
> > That was fine because config/riscv/meson.build did override it to valid
> > values later, but since b7676fcccab4 ("config: verify machine arch
> > flag") it will break the build as it tries to test -march=riscv which
> > is not a value value.
> >
> > The generic setting used in most cases is rv64gc, set this here
> > as well.
> >
> > Fixes: b7676fcccab4 ("config: verify machine arch flag")
> > Fixes: f22e705ebf12 ("eal/riscv: support RISC-V architecture")
> >
> > Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
> > ---
> >  config/meson.build | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/config/meson.build b/config/meson.build
> > index d732154731..a9ccd56deb 100644
> > --- a/config/meson.build
> > +++ b/config/meson.build
> > @@ -152,7 +152,7 @@ if cpu_instruction_set == 'generic'
> >      elif host_machine.cpu_family().startswith('ppc')
> >          cpu_instruction_set = 'power8'
> >      elif host_machine.cpu_family().startswith('riscv')
> > -        cpu_instruction_set = 'riscv'
> > +        cpu_instruction_set = 'rv64gc'
> 
> Copying more people.
> 
> This fix is probably the best, so close to the release.
> 

Agreed

> 
> However, I think a more complete fix would be to set this here to generic.
> And do the march validation in config/riscv/meson.build in a similar
> fashion to ARM.
> 
> Or maybe the validation added in b7676fcccab4 ("config: verify machine
> arch flag") should be moved after subdir(arch_subdir).
> Bruce, opinion?
> 

Probably the first of these two is best, to do the march validation in the
riscv-specific file. However, I've no strong opinions either way.

/Bruce

> 
> -- 
> David Marchand
>