From: Marc-André Lureau <marcandre.lureau@redhat.com>

This can help debugging issues or develop, when error handling is
introduced.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 include/qapi/error.h |  6 ++++++
 util/error.c         | 10 +++++++---
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/include/qapi/error.h b/include/qapi/error.h
index d798faeec3..f21a231bb1 100644
--- a/include/qapi/error.h
+++ b/include/qapi/error.h
@@ -519,6 +519,12 @@ static inline void error_propagator_cleanup(ErrorPropagator *prop)
 
 G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC(ErrorPropagator, error_propagator_cleanup);
 
+/*
+ * Special error destination to warn on error.
+ * See error_setg() and error_propagate() for details.
+ */
+extern Error *error_warn;
+
 /*
  * Special error destination to abort on error.
  * See error_setg() and error_propagate() for details.
diff --git a/util/error.c b/util/error.c
index 1e7af665b8..5537245da6 100644
--- a/util/error.c
+++ b/util/error.c
@@ -27,8 +27,9 @@ struct Error
 
 Error *error_abort;
 Error *error_fatal;
+Error *error_warn;
 
-static void error_handle_fatal(Error **errp, Error *err)
+static void error_handle(Error **errp, Error *err)
 {
     if (errp == &error_abort) {
         fprintf(stderr, "Unexpected error in %s() at %s:%d:\n",
@@ -43,6 +44,9 @@ static void error_handle_fatal(Error **errp, Error *err)
         error_report_err(err);
         exit(1);
     }
+    if (errp == &error_warn) {
+        warn_report_err(err);
+    }
 }
 
 G_GNUC_PRINTF(6, 0)
@@ -71,7 +75,7 @@ static void error_setv(Error **errp,
     err->line = line;
     err->func = func;
 
-    error_handle_fatal(errp, err);
+    error_handle(errp, err);
     *errp = err;
 
     errno = saved_errno;
@@ -284,7 +288,7 @@ void error_propagate(Error **dst_errp, Error *local_err)
     if (!local_err) {
         return;
     }
-    error_handle_fatal(dst_errp, local_err);
+    error_handle(dst_errp, local_err);
     if (dst_errp && !*dst_errp) {
         *dst_errp = local_err;
     } else {
-- 
2.39.1