Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Anders Roxell <anders.roxell@linaro.org>
To:     ast@kernel.org, daniel@iogearbox.net, shuah@kernel.org
Cc:     netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-kselftest@vger.kernel.org,
        Anders Roxell <anders.roxell@linaro.org>
Subject: [PATCH] selftests: bpf: fix urandom_read build issue
Date:   Thu,  7 Jun 2018 12:57:12 +0200
Message-Id: <20180607105712.553-1-anders.roxell@linaro.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

gcc complains that urandom_read gets built twice.

gcc -o tools/testing/selftests/bpf/urandom_read
-static urandom_read.c -Wl,--build-id
gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf
-I../../../../include/generated  -I../../../include    urandom_read.c
urandom_read -lcap -lelf -lrt -lpthread -o
tools/testing/selftests/bpf/urandom_read
gcc: fatal error: input file
‘tools/testing/selftests/bpf/urandom_read’ is the
same as output file
compilation terminated.
../lib.mk:110: recipe for target
'tools/testing/selftests/bpf/urandom_read' failed
To fix this issue remove the urandom_read target and so target
TEST_CUSTOM_PROGS gets used.

Fixes: 81f77fd0deeb ("bpf: add selftest for stackmap with BPF_F_STACK_BUILD_ID")
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
---
 tools/testing/selftests/bpf/Makefile | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 607ed8729c06..67285591ffd7 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -16,10 +16,8 @@ LDLIBS += -lcap -lelf -lrt -lpthread
 TEST_CUSTOM_PROGS = $(OUTPUT)/urandom_read
 all: $(TEST_CUSTOM_PROGS)
 
-$(TEST_CUSTOM_PROGS): urandom_read
-
-urandom_read: urandom_read.c
-	$(CC) -o $(TEST_CUSTOM_PROGS) -static $< -Wl,--build-id
+$(TEST_CUSTOM_PROGS): $(OUTPUT)/%: %.c
+	$(CC) -o $@ -static $< -Wl,--build-id
 
 # Order correspond to 'make run_tests' order
 TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
-- 
2.17.1