waf: add build option to include dates in binary

Tools/ardupilotwaf/boards.py

@@ -246,6 +246,9 @@ class Board:
                 cfg.srcnode.find_dir('modules/uavcan/libuavcan/include').abspath()
             ]
 
+        if cfg.env.build_dates:
+            env.build_dates = True
+
         # We always want to use PRI format macros
         cfg.define('__STDC_FORMAT_MACROS', 1)
 
@@ -259,9 +262,10 @@ class Board:
         bld.ap_version_append_str('GIT_VERSION', bld.git_head_hash(short=True))
         import time
         ltime = time.localtime()
-        bld.ap_version_append_int('BUILD_DATE_YEAR', ltime.tm_year)
-        bld.ap_version_append_int('BUILD_DATE_MONTH', ltime.tm_mon)
-        bld.ap_version_append_int('BUILD_DATE_DAY', ltime.tm_mday)
+        if bld.env.build_dates:
+            bld.ap_version_append_int('BUILD_DATE_YEAR', ltime.tm_year)
+            bld.ap_version_append_int('BUILD_DATE_MONTH', ltime.tm_mon)
+            bld.ap_version_append_int('BUILD_DATE_DAY', ltime.tm_mday)
 
     def embed_ROMFS_files(self, ctx):
         '''embed some files using AP_ROMFS'''

wscript

@@ -196,6 +196,10 @@ configuration in order to save typing.
                  default=False,
                  help="Enable SITL RGBLed")
 
+    g.add_option('--build-dates', action='store_true',
+                 default=False,
+                 help="Include build date in binaries.  Appears in AUTOPILOT_VERSION.os_sw_version")
+
     g.add_option('--sitl-flash-storage',
         action='store_true',
         default=False,