[PATCH v4 01/66] selftests: Compile with -D_GNU_SOURCE when including lib.mk

[Edward Liaw <edliaw@xxxxxxxxxx>]

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/Makefile | 4 ++--
 tools/testing/selftests/lib.mk   | 5 ++++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index f0431e6cb67e..9039f3709aff 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -170,11 +170,11 @@ ifneq ($(KBUILD_OUTPUT),)
   # $(realpath ...) resolves symlinks
   abs_objtree := $(realpath $(abs_objtree))
   BUILD := $(abs_objtree)/kselftest
-  KHDR_INCLUDES := -D_GNU_SOURCE -isystem ${abs_objtree}/usr/include
+  KHDR_INCLUDES := -isystem ${abs_objtree}/usr/include
 else
   BUILD := $(CURDIR)
   abs_srctree := $(shell cd $(top_srcdir) && pwd)
-  KHDR_INCLUDES := -D_GNU_SOURCE -isystem ${abs_srctree}/usr/include
+  KHDR_INCLUDES := -isystem ${abs_srctree}/usr/include
   DEFAULT_INSTALL_HDR_PATH := 1
 endif

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index 3023e0e2f58f..e782f4c96aee 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -67,7 +67,7 @@ MAKEFLAGS += --no-print-directory
 endif

 ifeq ($(KHDR_INCLUDES),)
-KHDR_INCLUDES := -D_GNU_SOURCE -isystem $(top_srcdir)/usr/include
+KHDR_INCLUDES := -isystem $(top_srcdir)/usr/include
 endif

 # In order to use newer items that haven't yet been added to the user's system
@@ -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)
--
2.45.0.118.g7fe29c98d7-goog