| Message ID | 20170314213600.3812349-1-arnd@arndb.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/Makefile b/Makefile index 6e7e644a0b84..608727d3e47f 100644 --- a/Makefile +++ b/Makefile @@ -662,7 +662,11 @@ KBUILD_CFLAGS += -Wextra 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> Cc: Namhyung Kim <namhyung.with.foss@gmail.com> --- v2: accidentally resend the same patch as before v3: actually fixed version number in check as pointed out by Namhyung Kim --- Makefile | 4 ++++ 1 file changed, 4 insertions(+)