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-rw-r--r--tools/testing/selftests/nolibc/Makefile.include3
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/testing/selftests/nolibc/Makefile.include b/tools/testing/selftests/nolibc/Makefile.include
index 41a0039f774c..96fe2bc2191e 100644
--- a/tools/testing/selftests/nolibc/Makefile.include
+++ b/tools/testing/selftests/nolibc/Makefile.include
@@ -5,7 +5,8 @@ _CFLAGS_STACKPROTECTOR ?= $(call try-run, \
echo 'void foo(void) {}' | $(CC) -x c - -o - -S $(CLANG_CROSS_FLAGS) $(__CFLAGS_STACKPROTECTOR) | grep -q __stack_chk_guard, \
$(__CFLAGS_STACKPROTECTOR))
_CFLAGS_SANITIZER ?= $(call cc-option,-fsanitize=undefined -fsanitize-trap=all)
-CFLAGS_NOLIBC_TEST ?= -Os -fno-ident -fno-asynchronous-unwind-tables -std=c89 -W -Wall -Wextra \
+CFLAGS_NOLIBC_TEST ?= -Os -fno-ident -fno-asynchronous-unwind-tables -std=c89 \
+ -W -Wall -Wextra -Wundef \
$(call cc-option,-fno-stack-protector) $(call cc-option,-Wmissing-prototypes) \
$(_CFLAGS_STACKPROTECTOR) $(_CFLAGS_SANITIZER)