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-rw-r--r--tools/testing/selftests/lib.mk3
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index 7b299ed5ff45..d6edcfcb5be8 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -196,6 +196,9 @@ endef
clean: $(if $(TEST_GEN_MODS_DIR),clean_mods_dir)
$(CLEAN)
+# Build with _GNU_SOURCE by default
+CFLAGS += -D_GNU_SOURCE=
+
# Enables to extend CFLAGS and LDFLAGS from command line, e.g.
# make USERCFLAGS=-Werror USERLDFLAGS=-static
CFLAGS += $(USERCFLAGS)