linux-kernel - [PATCH v2] selftests: bpf: fix urandom

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Message-Id: <20180608065127.28115-1-anders.roxell@linaro.org>
Date:   Fri,  8 Jun 2018 08:51:27 +0200
From:   Anders Roxell <anders.roxell@...aro.org>
To:     ast@...nel.org, daniel@...earbox.net, ys114321@...il.com,
        shuah@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Anders Roxell <anders.roxell@...aro.org>
Subject: [PATCH v2] selftests: bpf: fix urandom_read build issue

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@...aro.org>
Acked-by: Yonghong Song <yhs@...com>
---
 tools/testing/selftests/bpf/Makefile | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 607ed8729c06..7a6214e9ae58 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -16,9 +16,7 @@ LDLIBS += -lcap -lelf -lrt -lpthread
 TEST_CUSTOM_PROGS = $(OUTPUT)/urandom_read
 all: $(TEST_CUSTOM_PROGS)
 
-$(TEST_CUSTOM_PROGS): urandom_read
-
-urandom_read: urandom_read.c
+$(TEST_CUSTOM_PROGS): $(OUTPUT)/%: %.c
 	$(CC) -o $(TEST_CUSTOM_PROGS) -static $< -Wl,--build-id
 
 # Order correspond to 'make run_tests' order
-- 
2.17.1