Building DPDK with a gcc 11 based compiler such as the IBM Advanced Toolchain 15 (1) generates a stringop-overflow warning when using -O3 optimization (DPDK default for production releases):
writing 1 byte into a region of size 0 [-Wstringop-overflow=] The issue has been reported to the gcc project (2) but can be resolved by preventing the compiler from unrolling the loop as part of the -O3 optimization. (1) https://www.ibm.com/support/pages/advance-toolchain-linux-power (2) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102316 Bugzilla ID: 743 Signed-off-by: David Christensen <d...@linux.vnet.ibm.com> --- drivers/net/i40e/i40e_flow.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/net/i40e/i40e_flow.c index e41a84f1d7..17ab7ad9b9 100644 --- a/drivers/net/i40e/i40e_flow.c +++ b/drivers/net/i40e/i40e_flow.c @@ -3047,6 +3047,10 @@ i40e_flow_parse_fdir_pattern(struct rte_eth_dev *dev, return -rte_errno; } +#if defined(RTE_ARCH_PPC_64) && defined(RTE_TOOLCHAIN_GCC) && \ +(GCC_VERSION >= 110000) +#pragma GCC unroll 1 +#endif for (i = 0; i < raw_spec->length; i++) { j = i + next_dst_off; filter->input.flow_ext.flexbytes[j] = -- 2.27.0
