improve debug logging of emcc invocation

emcc

@@ -95,7 +95,8 @@ AUTODEBUG = os.environ.get('EMCC_AUTODEBUG') # If set to 1, we will run the auto
                                              # dlmalloc makes it hard to compare native and js builds
 EMCC_CFLAGS = os.environ.get('EMCC_CFLAGS') # Additional compiler flags that we treat as if they were passed to us on the commandline
 
-logging.debug('invocation: ' + ' '.join(sys.argv) + (' + ' + EMCC_CFLAGS if EMCC_CFLAGS else ''))
+if DEBUG: logging.warning('invocation: ' + ' '.join(sys.argv) + (' + ' + EMCC_CFLAGS if EMCC_CFLAGS else ''))
+
 if EMCC_CFLAGS: sys.argv.append(EMCC_CFLAGS)
 
 if DEBUG and LEAVE_INPUTS_RAW: logging.warning('leaving inputs raw')