[PATCH v5 01/68] selftests: Compile with -D_GNU_SOURCE when including lib.mk

[Edward Liaw]

lib.mk will add -D_GNU_SOURCE to CFLAGS by default.  This will make it
unnecessary to add #define _GNU_SOURCE in the source code.

Suggested-by: John Hubbard <jhubbard@xxxxxxxxxx>
Signed-off-by: Edward Liaw <edliaw@xxxxxxxxxx>
---
 tools/testing/selftests/lib.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index 429535816dbd..e782f4c96aee 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -188,6 +188,9 @@ 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)
-- 
2.45.1.288.g0e0cd299f1-goog