Add C comment why client encoding can be set in pg_upgrade.

diff --git a/contrib/pg_upgrade/server.c b/contrib/pg_upgrade/server.c
index d6efe9a..224fc96 100644 (file)
--- a/contrib/pg_upgrade/server.c
+++ b/contrib/pg_upgrade/server.c
@@ -267,6 +267,7 @@ check_for_libpq_envvars(void)
                {
                        const char *value;
 
+                       /* This allows us to see error messages in the local encoding */
                        if (strcmp(option->envvar, "PGCLIENTENCODING") == 0)
                                continue;