waf: added -g option to configure

this adds debug symbolds to the build without enabling other debug
code. This is needed for analysing watchdog crash dumps

Tools/ardupilotwaf/boards.py

@@ -261,6 +261,10 @@ def configure_env(self, cfg, env):
             env.DEFINES.update(
                 HAL_DEBUG_BUILD = 1,
             )
+        elif cfg.options.g:
+            env.CFLAGS += [
+                '-g',
+            ]
         if cfg.env.COVERAGE:
             env.CFLAGS += [
                 '-fprofile-arcs',

wscript

@@ -125,6 +125,11 @@ def options(opt):
         default=False,
         help='Configure as debug variant.')
 
+    g.add_option('-g',
+        action='store_true',
+        default=False,
+        help='Add debug symbolds to build.')
+
     g.add_option('--disable-watchdog',
         action='store_true',
         default=False,