Turn off warnings only for external code

code/extra_scripts.py

@@ -10,7 +10,7 @@ from platformio import util
 
 import distutils.spawn
 
-Import("env")
+Import("env", "projenv")
 
 # ------------------------------------------------------------------------------
 # Utils
@@ -86,6 +86,9 @@ def check_size(source, target, env):
 # Hooks
 # ------------------------------------------------------------------------------
 
+# Always show warnings for project code
+projenv.ProcessUnFlags("-w")
+
 remove_float_support()
 
 env.AddPostAction("$BUILD_DIR/${PROGNAME}.bin", check_size)