Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> writes:
> On 3/4/20 3:42 PM, Kees Cook wrote:
>> On Wed, Mar 04, 2020 at 03:13:33PM -0700, Shuah Khan wrote:
>>> Fix seccomp relocatable builds. This is a simple fix to use the
>>> right lib.mk variable TEST_GEN_PROGS for objects to leverage
>>> lib.mk common framework for relocatable builds.
>>>
>>> Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
>>> ---
>>> tools/testing/selftests/seccomp/Makefile | 16 +++-------------
>>> 1 file changed, 3 insertions(+), 13 deletions(-)
>>>
>>> diff --git a/tools/testing/selftests/seccomp/Makefile b/tools/testing/selftests/seccomp/Makefile
>>> index 1760b3e39730..a8a9717fc1be 100644
>>> --- a/tools/testing/selftests/seccomp/Makefile
>>> +++ b/tools/testing/selftests/seccomp/Makefile
>>> @@ -1,17 +1,7 @@
>>> # SPDX-License-Identifier: GPL-2.0
>>> -all:
>>> -
>>> -include ../lib.mk
>>> -
>>> -.PHONY: all clean
>>> -
>>> -BINARIES := seccomp_bpf seccomp_benchmark
>>> CFLAGS += -Wl,-no-as-needed -Wall
>>> +LDFLAGS += -lpthread
>>>
>>> -seccomp_bpf: seccomp_bpf.c ../kselftest_harness.h
>>
>> How is the ../kselftest_harness.h dependency detected in the resulting
>> build rules?
>>
>> Otherwise, looks good.
>
> Didn't see any problems. I will look into adding the dependency.
Before:
$ make --no-print-directory -C tools/testing/selftests/ TARGETS=seccomp
make --no-builtin-rules INSTALL_HDR_PATH=$BUILD/usr \
ARCH=powerpc -C ../../.. headers_install
INSTALL /home/michael/build/adhoc/kselftest/usr/include
gcc -Wl,-no-as-needed -Wall seccomp_bpf.c -lpthread -o seccomp_bpf
gcc -Wl,-no-as-needed -Wall seccomp_benchmark.c -o seccomp_benchmark
$ touch tools/testing/selftests/kselftest_harness.h
$ make --no-print-directory -C tools/testing/selftests/ TARGETS=seccomp
make --no-builtin-rules INSTALL_HDR_PATH=$BUILD/usr \
ARCH=powerpc -C ../../.. headers_install
INSTALL /home/michael/build/adhoc/kselftest/usr/include
gcc -Wl,-no-as-needed -Wall seccomp_bpf.c -lpthread -o seccomp_bpf
$
Note that touching the header causes it to rebuild seccomp_bpf.
With this patch applied:
$ make --no-print-directory -C tools/testing/selftests/ TARGETS=seccomp
make -s --no-builtin-rules INSTALL_HDR_PATH=$BUILD/usr \
ARCH=powerpc -C ../../.. headers_install
gcc -Wl,-no-as-needed -Wall -lpthread seccomp_bpf.c -o /home/michael/build/adhoc/kselftest/seccomp/seccomp_bpf
gcc -Wl,-no-as-needed -Wall -lpthread seccomp_benchmark.c -o /home/michael/build/adhoc/kselftest/seccomp/seccomp_benchmark
$ touch tools/testing/selftests/kselftest_harness.h
$ make --no-print-directory -C tools/testing/selftests/ TARGETS=seccomp
make -s --no-builtin-rules INSTALL_HDR_PATH=$BUILD/usr \
ARCH=powerpc -C ../../.. headers_install
make[1]: Nothing to be done for 'all'.
$
So yeah it still needs:
seccomp_bpf: ../kselftest_harness.h
cheers
