| Message ID | 20161216092503.2654754-1-arnd@arndb.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi, On Fri, Dec 16, 2016 at 6:24 PM, Arnd Bergmann <arnd@arndb.de> wrote: > When ftrace is enabled and we build with gcc-4.7 or older, we > get a warning for each file on architectures that select > CONFIG_LD_DEAD_CODE_DATA_ELIMINATION: > > warning: -ffunction-sections disabled; it makes profiling impossible [enabled by default] > > This turns off function sections in that specific case, leaving > it enabled for all other configurations. > > Fixes: b67067f1176d ("kbuild: allow archs to select link dead code/data elimination") > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > --- > Makefile | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/Makefile b/Makefile > index 4fb4b889c862..7dfd0aa4f3f7 100644 > --- a/Makefile > +++ b/Makefile > @@ -638,7 +638,11 @@ KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) > KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) > > ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION > +ifdef CONFIG_FUNCTION_TRACER > +KBUILD_CFLAGS += $(call cc-ifversion, -ge,0409,$(call cc-option,-ffunction-sections,)) s/0409/0408/ ? Thanks, Namhyung > +else > KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) > +endif > KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) > endif > > -- > 2.9.0 > -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Makefile b/Makefile index 4fb4b889c862..7dfd0aa4f3f7 100644 --- a/Makefile +++ b/Makefile @@ -638,7 +638,11 @@ KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION +ifdef CONFIG_FUNCTION_TRACER +KBUILD_CFLAGS += $(call cc-ifversion, -ge,0409,$(call cc-option,-ffunction-sections,)) +else KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) +endif KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) endif
When ftrace is enabled and we build with gcc-4.7 or older, we get a warning for each file on architectures that select CONFIG_LD_DEAD_CODE_DATA_ELIMINATION: warning: -ffunction-sections disabled; it makes profiling impossible [enabled by default] This turns off function sections in that specific case, leaving it enabled for all other configurations. Fixes: b67067f1176d ("kbuild: allow archs to select link dead code/data elimination") Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- Makefile | 4 ++++ 1 file changed, 4 insertions(+)