[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240529022938.129624-4-jhubbard@nvidia.com>
Date: Tue, 28 May 2024 19:29:38 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Shuah Khan <shuah@...nel.org>
Cc: 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>,
Edward Liaw <edliaw@...gle.com>,
André Almeida <andrealmeid@...lia.com>,
"Nysal Jan K . A" <nysal@...ux.ibm.com>,
Mark Brown <broonie@...nel.org>,
Valentin Obst <kernel@...entinobst.de>,
linux-kselftest@...r.kernel.org,
LKML <linux-kernel@...r.kernel.org>,
llvm@...ts.linux.dev,
John Hubbard <jhubbard@...dia.com>
Subject: [PATCH v2 3/3] selftests/futex: pass _GNU_SOURCE without a value to the compiler
It's slightly better to set _GNU_SOURCE in the source code, but if one
must do it via the compiler invocation, then the best way to do so is
this:
$(CC) -D_GNU_SOURCE=
..because otherwise, if this form is used:
$(CC) -D_GNU_SOURCE
..then that leads the compiler to set a value, as if you had passed in:
$(CC) -D_GNU_SOURCE=1
That, in turn, leads to warnings under both gcc and clang, like this:
futex_requeue_pi.c:20: warning: "_GNU_SOURCE" redefined
Fix this by using the "-D_GNU_SOURCE=" form.
Reviewed-by: Edward Liaw <edliaw@...gle.com>
Reviewed-by: Davidlohr Bueso <dave@...olabs.net>
Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
tools/testing/selftests/futex/functional/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/futex/functional/Makefile b/tools/testing/selftests/futex/functional/Makefile
index a392d0917b4e..994fa3468f17 100644
--- a/tools/testing/selftests/futex/functional/Makefile
+++ b/tools/testing/selftests/futex/functional/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
INCLUDES := -I../include -I../../ $(KHDR_INCLUDES)
-CFLAGS := $(CFLAGS) -g -O2 -Wall -D_GNU_SOURCE -pthread $(INCLUDES) $(KHDR_INCLUDES)
+CFLAGS := $(CFLAGS) -g -O2 -Wall -D_GNU_SOURCE= -pthread $(INCLUDES) $(KHDR_INCLUDES)
LDLIBS := -lpthread -lrt
LOCAL_HDRS := \
--
2.45.1
Powered by blists - more mailing lists