linux-kernel - Re: [PATCH 1/2] selftests: cgroup: build error multiple outpt files

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Message-ID: <20211201130637.phskqu7rkl5ty2xq@wittgenstein>
Date:   Wed, 1 Dec 2021 14:06:37 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     Anders Roxell <anders.roxell@...aro.org>, shuah@...nel.org,
        christian@...uner.io, nathan@...nel.org, ndesaulniers@...gle.com,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 1/2] selftests: cgroup: build error multiple outpt files

On Tue, Nov 30, 2021 at 09:41:49AM -0700, Shuah Khan wrote:
> On 11/23/21 7:26 AM, Christian Brauner wrote:
> > On Fri, Nov 19, 2021 at 05:22:20PM -0700, Shuah Khan wrote:
> > > On 11/5/21 10:25 AM, Anders Roxell wrote:
> > > > When building selftests/cgroup: with clang the following error are seen:
> > > > 
> > > > clang -Wall -pthread    test_memcontrol.c cgroup_util.c ../clone3/clone3_selftests.h  -o /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol
> > > > clang: error: cannot specify -o when generating multiple output files
> > > > make[3]: *** [../lib.mk:146: /home/anders/.cache/tuxmake/builds/current/kselftest/cgroup/test_memcontrol] Error 1
> > > > 
> > > > Rework to add the header files to LOCAL_HDRS before including ../lib.mk,
> > > > since the dependency is evaluated in '$(OUTPUT)/%:%.c $(LOCAL_HDRS)' in
> > > > file lib.mk.
> > > > 
> > > > Suggested-by: Arnd Bergmann <arnd@...db.de>
> > > > Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> > > > ---
> > > >    tools/testing/selftests/cgroup/Makefile | 12 +++++++-----
> > > >    tools/testing/selftests/lib.mk          |  2 +-
> > > >    2 files changed, 8 insertions(+), 6 deletions(-)
> > > > 
> > > > diff --git a/tools/testing/selftests/cgroup/Makefile b/tools/testing/selftests/cgroup/Makefile
> > > > index 59e222460581..745fe25fa0b9 100644
> > > > --- a/tools/testing/selftests/cgroup/Makefile
> > > > +++ b/tools/testing/selftests/cgroup/Makefile
> > > > @@ -11,10 +11,12 @@ TEST_GEN_PROGS += test_core
> > > >    TEST_GEN_PROGS += test_freezer
> > > >    TEST_GEN_PROGS += test_kill
> > > > +LOCAL_HDRS += $(selfdir)/clone3/clone3_selftests.h $(selfdir)/pidfd/pidfd.h
> > > > +
> > > 
> > > This looks odd to me. Why are we introducing dependencies between tests?
> > > clone3 includes in cgroup? Looks odd to me.
> > 
> > The cgroup tests need access to clone3() functionality in order to test
> > CLONE_INTO_CGROUP which is more suited to be placed alongside the cgroup
> > tests. There are a few other tests that include the clone3 header.
> > 
> 
> If other tests are also including this header, we could move it up under
> selftests level. Might have to add include directory.

No objection from me if that's useful. I won't have time for that in the
near future. (This might be of interest for one of the LF programs that
help get new folks interested in kernel development started.)

Christian