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From:   Anders Roxell <anders.roxell@linaro.org>
Date:   Thu, 7 Jun 2018 21:07:49 +0200
Message-ID: <CADYN=9J3wY1f6q4NvH1mHJXnu6GnErOqz75CfzfG1q5-WzcyCg@mail.gmail.com>
Subject: Re: [PATCH] selftests: bpf: fix urandom_read build issue
To:     Y Song <ys114321@gmail.com>
Cc:     Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Shuah Khan <shuah@kernel.org>, netdev <netdev@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        linux-kselftest@vger.kernel.org
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On 7 June 2018 at 19:52, Y Song <ys114321@gmail.com> wrote:
> On Thu, Jun 7, 2018 at 3:57 AM, Anders Roxell <anders.roxell@linaro.org> =
wrote:
>> 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
>> =E2=80=98tools/testing/selftests/bpf/urandom_read=E2=80=99 is the
>> same as output file
>> compilation terminated.
>> ../lib.mk:110: recipe for target
>> 'tools/testing/selftests/bpf/urandom_read' failed
>
> What is the build/make command to reproduce the above failure?

make -C tools/testing/selftests

Cheers,
Anders

>
>> 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_BU=
ILD_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/selfte=
sts/bpf/Makefile
>> index 607ed8729c06..67285591ffd7 100644
>> --- a/tools/testing/selftests/bpf/Makefile
>> +++ b/tools/testing/selftests/bpf/Makefile
>> @@ -16,10 +16,8 @@ LDLIBS +=3D -lcap -lelf -lrt -lpthread
>>  TEST_CUSTOM_PROGS =3D $(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 =3D test_verifier test_tag test_maps test_lru_map test_l=
pm_map test_progs \
>> --
>> 2.17.1
>>