[dpdk-dev] [PATCH v3 04/12] eal: allow empty compile time flags

[Zhigang Lu <zlu@ezchip.com>]

The rte_cpu_check_supported() code breaks with a "comparison is always
false due to limited range of data type" when the compile_time_flags[]
array is empty.  Assigning the array dimension to a local variable
apparently solves this.

Change-Id: I0ae21f529cf7b6dd9cf0f4532dce9198f4bf4230
Signed-off-by: Zhigang Lu <zlu@ezchip.com>
---
 lib/librte_eal/common/eal_common_cpuflags.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/librte_eal/common/eal_common_cpuflags.c b/lib/librte_eal/common/eal_common_cpuflags.c
index 6fd360c..8ba7b30 100644
--- a/lib/librte_eal/common/eal_common_cpuflags.c
+++ b/lib/librte_eal/common/eal_common_cpuflags.c
@@ -30,6 +30,7 @@
  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
+#include <rte_common.h>
 #include <rte_cpuflags.h>
 
 /*
@@ -62,10 +63,10 @@ rte_cpu_check_supported(void)
 	static const enum rte_cpu_flag_t compile_time_flags[] = {
 			RTE_COMPILE_TIME_CPUFLAGS
 	};
-	unsigned i;
+	unsigned count = RTE_DIM(compile_time_flags), i;
 	int ret;
 
-	for (i = 0; i < sizeof(compile_time_flags)/sizeof(compile_time_flags[0]); i++) {
+	for (i = 0; i < count; i++) {
 		ret = rte_cpu_get_flag_enabled(compile_time_flags[i]);
 
 		if (ret < 0) {
-- 
2.1.2