From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas.monjalon-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH] Pass CC option when building kernel modules
Date: Wed, 08 Oct 2014 19:15:04 +0200
Message-ID: <8311103.0CSzmCek1E@xps13>
References: <1412611022-8278-1-git-send-email-sergio.gonzalez.monroy@intel.com>
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To: Sergio Gonzalez Monroy <sergio.gonzalez.monroy-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
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2014-10-06 16:57, Sergio Gonzalez Monroy:
> At least on kernels 3.15 or newer, DPDK build is broken for CLANG target.
> The issue is that the kernel build system sets the flags before including
> DPDK makefile and therefore assumes the incorrect compiler.
> 
> Signed-off-by: Sergio Gonzalez Monroy <sergio.gonzalez.monroy-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

> --- a/mk/rte.module.mk
> +++ b/mk/rte.module.mk
> @@ -78,7 +78,7 @@ build: _postbuild
>  $(MODULE).ko: $(SRCS_LINKS)
>  	@if [ ! -f $(notdir Makefile) ]; then ln -nfs $(SRCDIR)/Makefile . ; fi
>  	@$(MAKE) -C $(RTE_KERNELDIR) M=$(CURDIR) O=$(RTE_KERNELDIR) \
> -		CROSS_COMPILE=$(CROSS)
> +		CC=$(KERNELCC) CROSS_COMPILE=$(CROSS)

> --- a/mk/target/generic/rte.vars.mk
> +++ b/mk/target/generic/rte.vars.mk
> @@ -149,4 +149,6 @@ endif
>  export CFLAGS
>  export LDFLAGS
>  
> +else # ! ifeq ($(KERNELRELEASE),)
> +CC = $(KERNELCC)
>  endif

Why is it needed here? Setting CC in rte.module.mk is not sufficient?

Thanks
-- 
Thomas