From 438df0f4f5e5fe487d19703d1b8b14a20029bf3b Mon Sep 17 00:00:00 2001
From: Moritz Bunkus <mo@bunkus.online>
Date: Thu, 8 Apr 2021 00:06:17 +0200
Subject: [PATCH] configure: fix --enable-ubsan which didn't actually enable
 anything

---
 NEWS.md                   | 5 +++++
 ac/debugging_profiling.m4 | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/NEWS.md b/NEWS.md
index 4ed4a7ca0..4a82a61d5 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -17,6 +17,11 @@
   mid-stream) from certain containers (e.g. Matroska). This bug was introduced
   in release 56.0.0. Fixes #3083.
 
+## Build system changes
+
+* configure: the `--enable-ubsan` option hasn't actually enabled anything
+  since release 39.0.0.
+
 
 # Version 56.0.0 "Strasbourg / St. Denis" 2021-04-05
 
diff --git a/ac/debugging_profiling.m4 b/ac/debugging_profiling.m4
index d162525f2..8b75a374f 100644
--- a/ac/debugging_profiling.m4
+++ b/ac/debugging_profiling.m4
@@ -94,7 +94,7 @@ AC_ARG_ENABLE([ubsan],
   AC_HELP_STRING([--enable-ubsan],[compile with sanitization for undefined behavior turned on (no)]),
   [],[enable_ubsan=no])
 
-if test x"$USE_UBSAN" = xyes ; then
+if test x"$enable_ubsan" = xyes ; then
   opt_features_yes="$opt_features_yes\n   * development technique 'undefined behavior sanitizer'"
 else
   opt_features_no="$opt_features_no\n   * development technique 'undefined behavior sanitizer'"