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

Edward Liaw
2024-05-10T00:09:17Z

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@nvidia.com>
Signed-off-by: Edward Liaw <edliaw@google.com>
---
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)