netdev - Re: [PATCH] selftests/bpf: fix vmtest static compilation error

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Date:   Wed, 25 Jan 2023 15:07:11 +0900
From:   "Daniel T. Lee" <danieltimlee@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Yonghong Song <yhs@...com>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
        Yosry Ahmed <yosryahmed@...gle.com>, bpf <bpf@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH] selftests/bpf: fix vmtest static compilation error

On Wed, Jan 25, 2023 at 1:21 AM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> On 1/21/23 7:41 AM, Daniel T. Lee wrote:
> > As stated in README.rst, in order to resolve errors with linker errors,
> > 'LDLIBS=-static' should be used. Most problems will be solved by this
> > option, but in the case of urandom_read, this won't fix the problem. So
> > the Makefile is currently implemented to strip the 'static' option when
> > compiling the urandom_read. However, stripping this static option isn't
> > configured properly on $(LDLIBS) correctly, which is now causing errors
> > on static compilation.
> >
> >      # LDLIBS=-static ./vmtest.sh
> >      ld.lld: error: attempted static link of dynamic object liburandom_read.so
> >      clang: error: linker command failed with exit code 1 (use -v to see invocation)
> >      make: *** [Makefile:190: /linux/tools/testing/selftests/bpf/urandom_read] Error 1
> >      make: *** Waiting for unfinished jobs....
> >
> > This commit fixes this problem by configuring the strip with $(LDLIBS).
> >
> > Fixes: 68084a136420 ("selftests/bpf: Fix building bpf selftests statically")
> > Signed-off-by: Daniel T. Lee <danieltimlee@...il.com>
> > ---
> >   tools/testing/selftests/bpf/Makefile | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> > index 22533a18705e..7bd1ce9c8d87 100644
> > --- a/tools/testing/selftests/bpf/Makefile
> > +++ b/tools/testing/selftests/bpf/Makefile
> > @@ -188,7 +188,7 @@ $(OUTPUT)/liburandom_read.so: urandom_read_lib1.c urandom_read_lib2.c
> >   $(OUTPUT)/urandom_read: urandom_read.c urandom_read_aux.c $(OUTPUT)/liburandom_read.so
> >       $(call msg,BINARY,,$@)
> >       $(Q)$(CLANG) $(filter-out -static,$(CFLAGS) $(LDFLAGS)) $(filter %.c,$^) \
> > -                  liburandom_read.so $(LDLIBS)                              \
> > +                  liburandom_read.so $(filter-out -static,$(LDLIBS))      \
>
> Do we need the same also for liburandom_read.so target's $(LDLIBS) further above?
>

Oops, I didn't notice that.
I'll apply the review and send the next version of patch!

> >                    -fuse-ld=$(LLD) -Wl,-znoseparate-code -Wl,--build-id=sha1 \
> >                    -Wl,-rpath=. -o $@
> >
> >
>


-- 
Best,
Daniel T. Lee