Re: [dpdk-dev] [PATCH v3 13/17] gcc/arm: avoid alignment errors to break build

[Jan Viktorin <viktorin@rehivetech.com>]

On Wed, 28 Oct 2015 13:16:24 +0100
David Marchand <david.marchand@6wind.com> wrote:

> On Tue, Oct 27, 2015 at 8:13 PM, Jan Viktorin <viktorin@rehivetech.com>
> wrote:
> 
> > There several issues with alignment when compiling for ARMv7.
> > They are not considered to be fatal (ARMv7 supports unaligned
> > access of 32b words), so we just leave them as warnings. They
> > should be solved later, however.
> >
> > Signed-off-by: Jan Viktorin <viktorin@rehivetech.com>
> > Signed-off-by: Vlastimil Kosar <kosar@rehivetech.com>
> > ---
> >  mk/toolchain/gcc/rte.vars.mk | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/mk/toolchain/gcc/rte.vars.mk b/mk/toolchain/gcc/rte.vars.mk
> > index 0f51c66..8f9c396 100644
> > --- a/mk/toolchain/gcc/rte.vars.mk
> > +++ b/mk/toolchain/gcc/rte.vars.mk
> > @@ -77,6 +77,12 @@ WERROR_FLAGS += -Wcast-align -Wnested-externs
> > -Wcast-qual
> >  WERROR_FLAGS += -Wformat-nonliteral -Wformat-security
> >  WERROR_FLAGS += -Wundef -Wwrite-strings
> >
> > +# There are many issues reported for ARMv7 architecture
> > +# which are not necessarily fatal. Report as warnings.
> > +ifeq ($(CONFIG_RTE_ARCH_ARMv7),y)
> > +WERROR_FLAGS += -Wno-error
> > +endif
> > +
> >  
> 
> Can we disable only "known" problems ?
> 
> Something like :
> WERROR_FLAGS += -Wno-error=cast-align
> 
> 

Sure! That's better idea, I always forgot about this possibilities in
GCC...

Jan

-- 
  Jan Viktorin                E-mail: Viktorin@RehiveTech.com
  System Architect            Web:    www.RehiveTech.com
  RehiveTech
  Brno, Czech Republic