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extra_script.py

@@ -3,8 +3,10 @@ Import("env")
 
 # Access to global construction environment
 build_tag = env['PIOENV']
-version_tag = os.getenv("FIRMWARE_VERSION")
+version_tag = os.getenv("FIRMWARE_VERSION", "dev").strip()
 
+# CPPDEFINES ensures the macro expands to a valid C string literal instead of a bare identifier.
+env.Append(CPPDEFINES=[('FIRMWARE_VERSION', f'\\"{version_tag}\\"')])
 env.Replace(PROGNAME="firmware_%s_%s" % (build_tag, version_tag))
 
 # include toolchain paths