[dpdk-dev] [PATCH v2] 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:

[Thomas Monjalon]

2015-03-30 12:06, Pablo de Lara:
> 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.
> 
> Changes in v2:
> 
> Added missing gcc version check (checking if gcc 4.4 is present)
> 
> Signed-off-by: Pablo de Lara <pablo.de.lara.guarch at intel.com>

Pawel's proposal was chosen because it doesn't require handling special
compiler version.