--- a/SConstruct
+++ b/SConstruct
@@ -3217,8 +3205,12 @@ if not env.TargetOSIs('windows', 'macOS') and (env.Too
     # setting it for both C and C++ by setting both of CFLAGS and
     # CXXFLAGS.
 
+    arm_march_flag = "armv8-a"
+    if get_option('use-hardware-crc32') == "on":
+        arm_march_flag += "+crc"
+
     default_targeting_flags_for_architecture = {
-        "aarch64": {"-march=": "armv8.2-a", "-mtune=": "generic"},
+        "aarch64": {"-march=": arm_march_flag, "-mtune=": "generic"},
         "i386": {"-march=": "nocona", "-mtune=": "generic"},
         "ppc64le": {"-mcpu=": "power8", "-mtune=": "power8", "-mcmodel=": "medium"},
         "s390x": {"-march=": "z196", "-mtune=": "zEC12"},