[Skiboot] [PATCH] Honor DEAD_CODE_ELIMINATION flag
npiggin at gmail.com
Fri Feb 28 13:00:44 AEDT 2020
Mauro S. M. Rodrigues's on February 28, 2020 3:14 am:
> While trying to reduce the size of the final binary I found
> DEAD_CODE_ELIMINATION=1 but it didn't change the binary size and
> known ununsed functions were seen when inspecting the elf with nm.
> Even though the necessary parameters for compiler, -ffunction-sections
> and -fdata-sections, are set, ld's --gc-sections wasn't, so add it in
> order to honor the flag.
> Signed-off-by: Mauro S. M. Rodrigues <maurosr at linux.vnet.ibm.com>
> Makefile.main | 1 +
> 1 file changed, 1 insertion(+)
> diff --git a/Makefile.main b/Makefile.main
> index 7ff2d21be..52251aa7e 100644
> --- a/Makefile.main
> +++ b/Makefile.main
> @@ -171,6 +171,7 @@ endif
> ifeq ($(DEAD_CODE_ELIMINATION),1)
> LDFLAGS += -Wl,--gc-sections
> +LDFLAGS_FINAL += --gc-sections
> AFLAGS := -D__ASSEMBLY__ -m64
Obviously required, I got the same thing lying around.
Reviewed-by: Nicholas Piggin <npiggin at gmail.com>
Did you get much savings? It wasn't a great deal when I last tried.
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