[dpdk-dev] Compiler minimum versions. (Was: [PATCH v5 05/10] qede: Add core driver)

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

On Wed, Apr 20, 2016 at 10:54:51AM +0200, Thomas Monjalon wrote:
> 2016-04-20 01:09, Rasesh Mody:
> > Hi Thomas,
> > 
> > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > Sent: Tuesday, April 19, 2016 5:59 AM
> > > 
> > > 2016-03-31 19:15, Rasesh Mody:
> > > > +ifeq ($(OS_TYPE),Linux)
> > > > +CFLAGS_ECORE_DRIVER += -Wno-shift-negative-value endif
> > > 
> > > I see an error with clang:
> > > fatal error: unknown warning option '-Wno-shift-negative-value';
> > > 	did you mean '-Wno-shift-sign-overflow'?
> > 
> > We had compiled all our v5 driver patches against clang v3.8 on  RH7.1 and didn't see a similar error. 
> >          "clang version 3.8.0 (trunk 249596) (llvm/trunk 249595)"
> > 
> > The '-Wno-shift-negative-value' option only got introduced after 3.6.0 clang release.  Pls. let us know if we need to support a minimum version of clang. We had asked this question earlier in the dpdk community, however we didn't hear back from anyone so far.
> 
> I use clang-3.6.2.
> You are right there is no official requirement in
> doc/guides/linux_gsg/sys_reqs.rst.
> Opinions about minimal version to support?

[Updating subject to make this discussion easier to find in searches]

Given that we support FreeBSD 10.x, Clang 3.4 may be a good minimum version
to support.
On the gcc side, v4.5 is rather old by now, should we update min to v4.8?

/Bruce