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@nvidia.com Signed-off-by: Edward Liaw edliaw@google.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)