[PATCH net-next] samples/bpf: fix in-source build of samples with clang

[PATCH net-next] samples/bpf: fix in-source build of samples with clang

[Alexei Starovoitov]

From: Brenden Blanco <bblanco@plumgrid.com>

in-source build of 'make samples/bpf/' was incorrectly
using default compiler instead of invoking clang/llvm.
out-of-source build was ok.

Fixes: a80857822b0c ("samples: bpf: trivial eBPF program in C")
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
---
It's a minor fix and not strictly necessary for stable.

 samples/bpf/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 76e3458a5419..8fdbd73429dd 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 $@
-- 
1.7.9.5

Re: [PATCH net-next] samples/bpf: fix in-source build of samples with clang

[David Miller]

From: Alexei Starovoitov <ast@plumgrid.com>
Date: Mon, 11 May 2015 21:25:51 -0700

> From: Brenden Blanco <bblanco@plumgrid.com>
> 
> in-source build of 'make samples/bpf/' was incorrectly
> using default compiler instead of invoking clang/llvm.
> out-of-source build was ok.
> 
> Fixes: a80857822b0c ("samples: bpf: trivial eBPF program in C")
> Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>
> Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>

Applied.