diff options
| -rw-r--r-- | trace/control.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/trace/control.c b/trace/control.c index 6c775e68eb..2ffe000818 100644 --- a/trace/control.c +++ b/trace/control.c @@ -226,10 +226,15 @@ void trace_init_file(const char *file) #ifdef CONFIG_TRACE_SIMPLE st_set_trace_file(file); #elif defined CONFIG_TRACE_LOG - /* If both the simple and the log backends are enabled, "--trace file" - * only applies to the simple backend; use "-D" for the log backend. + /* + * If both the simple and the log backends are enabled, "--trace file" + * only applies to the simple backend; use "-D" for the log + * backend. However we should only override -D if we actually have + * something to override it with. */ - qemu_set_log_filename(file, &error_fatal); + if (file) { + qemu_set_log_filename(file, &error_fatal); + } #else if (file) { fprintf(stderr, "error: --trace file=...: " |