Re: [dpdk-dev] [PATCH] test: Disable strict-aliasing warnings

[Thomas Monjalon <thomas.monjalon@6wind.com>]

2015-03-26 19:17, Pablo de Lara:
> DPDK does not build on gcc 4.4, as it complains due to
> strict-aliasing rules in virtual_pmd and link_bonding_mode4 tests,
> with no errors in next gcc versions:

Do you mean it's not possible to fix it in the code?
You are disabling some checks which may be relevant.

> CC virtual_pmd.o
> CC test_link_bonding_mode4.o
> cc1: warnings being treated as errors
> /root/dpdk/app/test/test_link_bonding_mode4.c: In function ‘test_mode4_expired’:
> /root/dpdk/x86_64-native-linuxapp-gcc/include/rte_ring.h:645: error: dereferencing pointer ‘pkt.409’ does break strict-aliasing rules
> /root/dpdk/x86_64-native-linuxapp-gcc/include/rte_ring.h:729: error: dereferencing pointer ‘pkt.409’ does break strict-aliasing rules
> ...
> cc1: warnings being treated as errors
> /root/dpdk/app/test/virtual_pmd.c: In function ‘virtual_ethdev_stats_reset’:
> /root/dpdk/x86_64-native-linuxapp-gcc/include/rte_ring.h:645: error: dereferencing pointer ‘pkt.338’ does break strict-aliasing rules
> /root/dpdk/x86_64-native-linuxapp-gcc/include/rte_ring.h:729: error: dereferencing pointer ‘pkt.338’ does break strict-aliasing rules
> 
> This patch fixes the compilation by disabling
> these warnings.
> 
> Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
> ---
>  app/test/Makefile |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/app/test/Makefile b/app/test/Makefile
> index 4aca77c..0d62d07 100644
> --- a/app/test/Makefile
> +++ b/app/test/Makefile
> @@ -158,6 +158,11 @@ CFLAGS_test_memcpy_perf.o += -fno-var-tracking-assignments
>  endif
>  endif
>  
> +# Disable warnings of no-strict-aliasing in virtual_pmd
> +# and test_link_bonding_mode4 tests
> +CFLAGS_virtual_pmd.o += -Wno-strict-aliasing
> +CFLAGS_test_link_bonding_mode4.o += -Wno-strict-aliasing
> +
>  # this application needs libraries first
>  DEPDIRS-y += lib
>  
>