Re: [PATCH] build: remove obsolete compiler checks

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

On Fri, Jul 18, 2025 at 02:45:48PM +0200, David Marchand wrote:
> On Fri, Jul 18, 2025 at 2:14 PM Bruce Richardson
> <bruce.richardson@intel.com> wrote:
> > diff --git a/drivers/net/virtio/meson.build b/drivers/net/virtio/meson.build
> > index d3caa3a3b4..a9ff87e863 100644
> > --- a/drivers/net/virtio/meson.build
> > +++ b/drivers/net/virtio/meson.build
> > @@ -31,7 +31,7 @@ if arch_subdir == 'x86'
> >          sources_avx512 += files('virtio_rxtx_packed.c')
> >          if (toolchain == 'gcc' and cc.version().version_compare('>=8.3.0'))
> >              cflags += '-DVIRTIO_GCC_UNROLL_PRAGMA'
> > -        elif (toolchain == 'clang' and cc.version().version_compare('>=3.7.0'))
> > +        elif (toolchain == 'clang')
> >              cflags += '-DVIRTIO_CLANG_UNROLL_PRAGMA'
> >          endif
> >      endif
> 
> One other nit, not blocking.
> 
> There should be no need for special casing clang vs gcc, since clang
> supports gcc syntax in general.
> https://clang.llvm.org/docs/AttributeReference.html#pragma-unroll-pragma-nounroll
> 
I was actually thinking of doing a follow-up patch to remove the "if" and
instead do:

	cflags += '-DVIRTIO_' + toolchain.to_upper() + "_UNROLL_PRAGMA"

on the basis that having a define for any other unknown compilers would be
harmless. However, you are right that there seems to be little reason to do
this in meson.build, and the code can do it directly itself. I'll leave
this part as it is in the patch for now.

/Bruce