linux-kernel - [PATCH 3.19.y-ckt 242/251] samples/bpf: fix in-source build of samples with clang

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Message-Id: <1437008972-9140-243-git-send-email-kamal@canonical.com>
Date:	Wed, 15 Jul 2015 18:09:23 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Brenden Blanco <bblanco@...mgrid.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 242/251] samples/bpf: fix in-source build of samples with clang

3.19.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Brenden Blanco <bblanco@...mgrid.com>

commit b88c06e36dcb9b4ae285f7821f62d68dc34b25d3 upstream.

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@...mgrid.com>
Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 samples/bpf/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index b5b3600..0594a58 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -27,7 +27,7 @@ HOSTLOADLIBES_sockex2 += -lelf
 # 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 $@
-- 
1.9.1

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