linux-kernel - [PATCH v6 02/13] selftests: Add -D_GNU

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Message-ID: <20240624232718.1154427-3-edliaw@google.com>
Date: Mon, 24 Jun 2024 23:26:11 +0000
From: Edward Liaw <edliaw@...gle.com>
To: linux-kselftest@...r.kernel.org, Eric Biederman <ebiederm@...ssion.com>, 
	Kees Cook <kees@...nel.org>, Shuah Khan <shuah@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
	Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, 
	Darren Hart <dvhart@...radead.org>, Davidlohr Bueso <dave@...olabs.net>, 
	"André Almeida" <andrealmeid@...lia.com>, Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>, 
	Paolo Bonzini <pbonzini@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Fenghua Yu <fenghua.yu@...el.com>, 
	Reinette Chatre <reinette.chatre@...el.com>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Jarkko Sakkinen <jarkko@...nel.org>, Dave Hansen <dave.hansen@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, usama.anjum@...labora.com, seanjc@...gle.com, 
	kernel-team@...roid.com, Edward Liaw <edliaw@...gle.com>, linux-mm@...ck.org, 
	iommu@...ts.linux.dev, kvm@...r.kernel.org, netdev@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	linux-sgx@...r.kernel.org, John Hubbard <jhubbard@...dia.com>
Subject: [PATCH v6 02/13] selftests: Add -D_GNU_SOURCE= to CFLAGS in lib.mk

Centralizes the _GNU_SOURCE definition to CFLAGS in lib.mk.

This uses the form "-D_GNU_SOURCE=", which is equivalent to
"#define _GNU_SOURCE".

Otherwise using "-D_GNU_SOURCE" is equivalent to "-D_GNU_SOURCE=1" and
"#define _GNU_SOURCE 1", which is less commonly seen in source code and
would require many changes in selftests to avoid redefinition warnings.

Suggested-by: John Hubbard <jhubbard@...dia.com>
Signed-off-by: Edward Liaw <edliaw@...gle.com>
---
 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 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)
-- 
2.45.2.741.gdbec12cfda-goog