| Message ID | 20240503041843.99136-4-jhubbard@nvidia.com |
|---|---|
| State | New |
| Headers | show |
| Series | selftests/futex: clang-inspired fixes | expand |
On 5/2/24 9:18 PM, John Hubbard wrote: > 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: Hi Shuah, Edward and all, This patch now seems to be obsolete, due to Edward Liaw's comprehensive fix, "[PATCH v2 0/5] Define _GNU_SOURCE for sources using" [1]. [1] https://lore.kernel.org/20240507214254.2787305-1-edliaw@google.com A process question for Shuah: shall I gather up the selftest patches that have reviews and acks, and post them with the versions incremented? I'm new to this list, and I'm not sure of your exact workflow. And there are admittedly a flurry of patches involved. [1] https://lore.kernel.org/20240507214254.2787305-1-edliaw@google.com thanks,
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 := \
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. Signed-off-by: John Hubbard <jhubbard@nvidia.com> --- tools/testing/selftests/futex/functional/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)