Building DPDK on Ubuntu 20.04 with GCC 9.3.0 results in a "subscript is outside array bounds" message in rte_memcpy function. The build error is caused by an interaction between __builtin_constant_p and "-Werror=array-bounds" as described in this bugzilla:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90387 Modify the code to disable the array-bounds check for GCC versions 9.0 to 9.3. Signed-off-by: David Christensen <d...@linux.vnet.ibm.com> --- lib/librte_eal/ppc/include/rte_memcpy.h | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/lib/librte_eal/ppc/include/rte_memcpy.h b/lib/librte_eal/ppc/include/rte_memcpy.h index 25311ba1d..dce173d4b 100644 --- a/lib/librte_eal/ppc/include/rte_memcpy.h +++ b/lib/librte_eal/ppc/include/rte_memcpy.h @@ -8,8 +8,7 @@ #include <stdint.h> #include <string.h> -/*To include altivec.h, GCC version must >= 4.8 */ -#include <altivec.h> +#include "rte_altivec.h" #ifdef __cplusplus extern "C" { @@ -17,6 +16,11 @@ extern "C" { #include "generic/rte_memcpy.h" +#if (__GNUC__ == 9 && __GNUC_MINOR__ < 4) +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Warray-bounds" +#endif + static inline void rte_mov16(uint8_t *dst, const uint8_t *src) { @@ -192,6 +196,10 @@ rte_memcpy_func(void *dst, const void *src, size_t n) return ret; } +#if (__GNUC__ == 9 && __GNUC_MINOR__ < 4) +#pragma GCC diagnostic pop +#endif + #ifdef __cplusplus } #endif -- 2.18.1
