linux-kernel - Re: [RFC PATCH 4/5] samples/bpf: Add proper prefix to objects in Makefile

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Date:	Mon, 18 May 2015 12:59:23 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	He Kuang <hekuang@...wei.com>, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, mingo@...hat.com, acme@...nel.org,
	namhyung@...nel.org, jolsa@...nel.org, dsahern@...il.com,
	daniel@...earbox.net, brendan.d.gregg@...il.com,
	masami.hiramatsu.pt@...achi.com
CC:	wangnan0@...wei.com, lizefan@...wei.com,
	linux-kernel@...r.kernel.org, pi3orama@....com
Subject: Re: [RFC PATCH 4/5] samples/bpf: Add proper prefix to objects in
 Makefile

On 5/17/15 10:30 PM, He Kuang wrote:
> Always use $(obj) when referring to generated files and use $(src) when
> referring to files located in the src tree.
>
> Signed-off-by: He Kuang <hekuang@...wei.com>
> ---
>   samples/bpf/Makefile | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
> index 76e3458..8fdbd73 100644
> --- a/samples/bpf/Makefile
> +++ b/samples/bpf/Makefile
> @@ -44,7 +44,7 @@ HOSTLOADLIBES_tracex4 += -lelf -lrt
>   # point this to your LLVM backend with bpf support
>   LLC=$(srctree)/tools/bpf/llvm/bld/Debug+Asserts/bin/llc
>
> -%.o: %.c
> +$(obj)/%.o: $(src)/%.c
>   	clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \
>   		-D__KERNEL__ -Wno-unused-value -Wno-pointer-sign \
>   		-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@

the same fix is already in net-next:
https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=b88c06e36dcb9b4ae285f7821f62d68dc34b25d3

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