Subject: Re: [PATCH 1/1] powerpc: crtsaveres.o needed only when -Os flag is enabled

From: "Aneesh Kumar K.V" <[email-masked]>
Date: Fri, 02 May 2014 11:09:17 +0530

Ram Pai <[email-masked]> writes:

>     powerpc: crtsaveres.o needed only when -Os flag is enabled
>     
>     Currently on powerpc arch, out-of-tree module fails to build without
>     crtsaveres.o, even when the module has no dependency on the symbols
>     provided by the file; when built without the -Os flag.
>     
>     BTW: '-Os' flag is enabled when CONFIG_CC_OPTIMIZE_FOR_SIZE is
>     configured.
>     
>     This patch fixes that problem.
>     
> Signed-off-by: Ram Pai <[email-masked]>
>
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 4c0cedf..cf12f38 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -157,7 +157,10 @@ CPP		= $(CC) -E $(KBUILD_CFLAGS)
>  
>  CHECKFLAGS	+= -m$(CONFIG_WORD_SIZE) -D__powerpc__ -D__powerpc$(CONFIG_WORD_SIZE)__
>  
> +ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
>  KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
> +endif
> +
>  
>  # No AltiVec or VSX instructions when building kernel
>  KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
>

So if we enable CONFIG_CC_OPTIMIZE_FOR_SIZE can we build out-of-tree
module with this patch ? 

-aneesh