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-rw-r--r--assert/tst-assert-c++.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/assert/tst-assert-c++.cc b/assert/tst-assert-c++.cc
index 41cb487512..c01fc8bd25 100644
--- a/assert/tst-assert-c++.cc
+++ b/assert/tst-assert-c++.cc
@@ -16,6 +16,9 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
+/* Undefine NDEBUG to ensure the build system e.g. CFLAGS/CXXFLAGS
+   does not disable the asserts we want to test.  */
+#undef NDEBUG
 #include <assert.h>
 
 /* The C++ standard requires that if the assert argument is a constant