linux-kernel - [PATCH v3 03/68] selftests: Compile with -D_GNU

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Date: Thu,  9 May 2024 19:57:55 +0000
From: Edward Liaw <edliaw@...gle.com>
To: shuah@...nel.org, "Mickaël Salaün" <mic@...ikod.net>, 
	"Günther Noack" <gnoack@...gle.com>, Christian Brauner <brauner@...nel.org>, 
	Richard Cochran <richardcochran@...il.com>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	"David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Jesper Dangaard Brouer <hawk@...nel.org>, John Fastabend <john.fastabend@...il.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Edward Liaw <edliaw@...gle.com>, 
	Muhammad Usama Anjum <usama.anjum@...labora.com>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	kernel-team@...roid.com, linux-security-module@...r.kernel.org, 
	netdev@...r.kernel.org, linux-riscv@...ts.infradead.org, bpf@...r.kernel.org, 
	John Hubbard <jhubbard@...dia.com>
Subject: [PATCH v3 03/68] selftests: Compile with -D_GNU_SOURCE when including lib.mk

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.

Fixes: 809216233555 ("selftests/harness: remove use of LINE_MAX")
Suggested-by: John Hubbard <jhubbard@...dia.com>
Signed-off-by: Edward Liaw <edliaw@...gle.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)
-- 
2.45.0.118.g7fe29c98d7-goog