On 6/26/24 3:34 AM, Edward Liaw wrote:
> Centralize the _GNU_SOURCE definition to CFLAGS in lib.mk. Remove
> redundant defines from Makefiles that import lib.mk. Convert any usage
> of "#define _GNU_SOURCE 1" to "#define _GNU_SOURCE".
>
> 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@xxxxxxxxxx>
> Signed-off-by: Edward Liaw <edliaw@xxxxxxxxxx>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>
> ---
> tools/testing/selftests/exec/Makefile | 1 -
> tools/testing/selftests/futex/functional/Makefile | 2 +-
> tools/testing/selftests/intel_pstate/Makefile | 2 +-
> tools/testing/selftests/iommu/Makefile | 2 --
> tools/testing/selftests/kvm/Makefile | 2 +-
> tools/testing/selftests/lib.mk | 3 +++
> tools/testing/selftests/mm/thuge-gen.c | 2 +-
> tools/testing/selftests/net/Makefile | 2 +-
> tools/testing/selftests/net/tcp_ao/Makefile | 2 +-
> tools/testing/selftests/proc/Makefile | 1 -
> tools/testing/selftests/resctrl/Makefile | 2 +-
> tools/testing/selftests/ring-buffer/Makefile | 1 -
> tools/testing/selftests/riscv/mm/Makefile | 2 +-
> tools/testing/selftests/sgx/Makefile | 2 +-
> tools/testing/selftests/tmpfs/Makefile | 1 -
> 15 files changed, 12 insertions(+), 15 deletions(-)
>
> diff --git a/tools/testing/selftests/exec/Makefile b/tools/testing/selftests/exec/Makefile
> index ab67d58cfab7..ba012bc5aab9 100644
> --- a/tools/testing/selftests/exec/Makefile
> +++ b/tools/testing/selftests/exec/Makefile
> @@ -1,7 +1,6 @@
> # SPDX-License-Identifier: GPL-2.0
> CFLAGS = -Wall
> CFLAGS += -Wno-nonnull
> -CFLAGS += -D_GNU_SOURCE
>
> ALIGNS := 0x1000 0x200000 0x1000000
> ALIGN_PIES := $(patsubst %,load_address.%,$(ALIGNS))
> diff --git a/tools/testing/selftests/futex/functional/Makefile b/tools/testing/selftests/futex/functional/Makefile
> index 994fa3468f17..f79f9bac7918 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 -pthread $(INCLUDES) $(KHDR_INCLUDES)
> LDLIBS := -lpthread -lrt
>
> LOCAL_HDRS := \
> diff --git a/tools/testing/selftests/intel_pstate/Makefile b/tools/testing/selftests/intel_pstate/Makefile
> index 05d66ef50c97..f45372cb00fe 100644
> --- a/tools/testing/selftests/intel_pstate/Makefile
> +++ b/tools/testing/selftests/intel_pstate/Makefile
> @@ -1,5 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0
> -CFLAGS := $(CFLAGS) -Wall -D_GNU_SOURCE
> +CFLAGS := $(CFLAGS) -Wall
> LDLIBS += -lm
>
> ARCH ?= $(shell uname -m 2>/dev/null || echo not)
> diff --git a/tools/testing/selftests/iommu/Makefile b/tools/testing/selftests/iommu/Makefile
> index 32c5fdfd0eef..fd6477911f24 100644
> --- a/tools/testing/selftests/iommu/Makefile
> +++ b/tools/testing/selftests/iommu/Makefile
> @@ -2,8 +2,6 @@
> CFLAGS += -Wall -O2 -Wno-unused-function
> CFLAGS += $(KHDR_INCLUDES)
>
> -CFLAGS += -D_GNU_SOURCE
> -
> TEST_GEN_PROGS :=
> TEST_GEN_PROGS += iommufd
> TEST_GEN_PROGS += iommufd_fail_nth
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index ac280dcba996..4ee37abf70ff 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -231,7 +231,7 @@ LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/$(ARCH)/include
> endif
> CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
> -Wno-gnu-variable-sized-type-not-at-end -MD -MP -DCONFIG_64BIT \
> - -D_GNU_SOURCE -fno-builtin-memcmp -fno-builtin-memcpy \
> + -fno-builtin-memcmp -fno-builtin-memcpy \
> -fno-builtin-memset -fno-builtin-strnlen \
> -fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \
> -I$(LINUX_TOOL_ARCH_INCLUDE) -I$(LINUX_HDR_PATH) -Iinclude \
> 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)
> diff --git a/tools/testing/selftests/mm/thuge-gen.c b/tools/testing/selftests/mm/thuge-gen.c
> index d50dc71cac32..e4370b79b62f 100644
> --- a/tools/testing/selftests/mm/thuge-gen.c
> +++ b/tools/testing/selftests/mm/thuge-gen.c
> @@ -13,7 +13,7 @@
> sudo ipcs | awk '$1 == "0x00000000" {print $2}' | xargs -n1 sudo ipcrm -m
> (warning this will remove all if someone else uses them) */
>
> -#define _GNU_SOURCE 1
> +#define _GNU_SOURCE
> #include <sys/mman.h>
> #include <linux/mman.h>
> #include <stdlib.h>
> diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
> index bc3925200637..8eaffd7a641c 100644
> --- a/tools/testing/selftests/net/Makefile
> +++ b/tools/testing/selftests/net/Makefile
> @@ -1,7 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0
> # Makefile for net selftests
>
> -CFLAGS = -Wall -Wl,--no-as-needed -O2 -g
> +CFLAGS += -Wall -Wl,--no-as-needed -O2 -g
> CFLAGS += -I../../../../usr/include/ $(KHDR_INCLUDES)
> # Additional include paths needed by kselftest.h
> CFLAGS += -I../
> diff --git a/tools/testing/selftests/net/tcp_ao/Makefile b/tools/testing/selftests/net/tcp_ao/Makefile
> index 522d991e310e..bd88b90b902b 100644
> --- a/tools/testing/selftests/net/tcp_ao/Makefile
> +++ b/tools/testing/selftests/net/tcp_ao/Makefile
> @@ -26,7 +26,7 @@ LIB := $(LIBDIR)/libaotst.a
> LDLIBS += $(LIB) -pthread
> LIBDEPS := lib/aolib.h Makefile
>
> -CFLAGS := -Wall -O2 -g -D_GNU_SOURCE -fno-strict-aliasing
> +CFLAGS += -Wall -O2 -g -fno-strict-aliasing
> CFLAGS += $(KHDR_INCLUDES)
> CFLAGS += -iquote ./lib/ -I ../../../../include/
>
> diff --git a/tools/testing/selftests/proc/Makefile b/tools/testing/selftests/proc/Makefile
> index 6066f607f758..ee424a9f075f 100644
> --- a/tools/testing/selftests/proc/Makefile
> +++ b/tools/testing/selftests/proc/Makefile
> @@ -1,6 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0-only
> CFLAGS += -Wall -O2 -Wno-unused-function
> -CFLAGS += -D_GNU_SOURCE
> LDFLAGS += -pthread
>
> TEST_GEN_PROGS :=
> diff --git a/tools/testing/selftests/resctrl/Makefile b/tools/testing/selftests/resctrl/Makefile
> index 021863f86053..f408bd6bfc3d 100644
> --- a/tools/testing/selftests/resctrl/Makefile
> +++ b/tools/testing/selftests/resctrl/Makefile
> @@ -1,6 +1,6 @@
> # SPDX-License-Identifier: GPL-2.0
>
> -CFLAGS = -g -Wall -O2 -D_FORTIFY_SOURCE=2 -D_GNU_SOURCE
> +CFLAGS = -g -Wall -O2 -D_FORTIFY_SOURCE=2
> CFLAGS += $(KHDR_INCLUDES)
>
> TEST_GEN_PROGS := resctrl_tests
> diff --git a/tools/testing/selftests/ring-buffer/Makefile b/tools/testing/selftests/ring-buffer/Makefile
> index 627c5fa6d1ab..23605782639e 100644
> --- a/tools/testing/selftests/ring-buffer/Makefile
> +++ b/tools/testing/selftests/ring-buffer/Makefile
> @@ -1,7 +1,6 @@
> # SPDX-License-Identifier: GPL-2.0
> CFLAGS += -Wl,-no-as-needed -Wall
> CFLAGS += $(KHDR_INCLUDES)
> -CFLAGS += -D_GNU_SOURCE
>
> TEST_GEN_PROGS = map_test
>
> diff --git a/tools/testing/selftests/riscv/mm/Makefile b/tools/testing/selftests/riscv/mm/Makefile
> index c333263f2b27..4664ed79e20b 100644
> --- a/tools/testing/selftests/riscv/mm/Makefile
> +++ b/tools/testing/selftests/riscv/mm/Makefile
> @@ -3,7 +3,7 @@
> # Originally tools/testing/arm64/abi/Makefile
>
> # Additional include paths needed by kselftest.h and local headers
> -CFLAGS += -D_GNU_SOURCE -std=gnu99 -I.
> +CFLAGS += -std=gnu99 -I.
>
> TEST_GEN_FILES := mmap_default mmap_bottomup
>
> diff --git a/tools/testing/selftests/sgx/Makefile b/tools/testing/selftests/sgx/Makefile
> index 867f88ce2570..03b5e13b872b 100644
> --- a/tools/testing/selftests/sgx/Makefile
> +++ b/tools/testing/selftests/sgx/Makefile
> @@ -12,7 +12,7 @@ OBJCOPY := $(CROSS_COMPILE)objcopy
> endif
>
> INCLUDES := -I$(top_srcdir)/tools/include
> -HOST_CFLAGS := -Wall -Werror -g $(INCLUDES) -fPIC
> +HOST_CFLAGS := -Wall -Werror -g $(INCLUDES) -fPIC $(CFLAGS)
> HOST_LDFLAGS := -z noexecstack -lcrypto
> ENCL_CFLAGS += -Wall -Werror -static-pie -nostdlib -ffreestanding -fPIE \
> -fno-stack-protector -mrdrnd $(INCLUDES)
> diff --git a/tools/testing/selftests/tmpfs/Makefile b/tools/testing/selftests/tmpfs/Makefile
> index aa11ccc92e5b..3be931e1193f 100644
> --- a/tools/testing/selftests/tmpfs/Makefile
> +++ b/tools/testing/selftests/tmpfs/Makefile
> @@ -1,6 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0-only
> CFLAGS += -Wall -O2
> -CFLAGS += -D_GNU_SOURCE
>
> TEST_GEN_PROGS :=
> TEST_GEN_PROGS += bug-link-o-tmpfile
--
BR,
Muhammad Usama Anjum
