On Fri, Mar 4, 2022 at 9:18 AM KP Singh <kpsingh@xxxxxxxxxx> wrote:
>
> On Fri, Mar 4, 2022 at 5:57 PM sunyucong@xxxxxxxxx <sunyucong@xxxxxxxxx> wrote:
> >
> > On Fri, Mar 4, 2022 at 8:48 AM KP Singh <kpsingh@xxxxxxxxxx> wrote:
> > >
> > > Dynamic linking when compiling on the host can cause issues when the
> > > libc version does not match the one in the VM image.
> > > Allow the user to use static compilation when this issue arises:
> > >
> > > Before:
> > > ./vmtest.sh -- ./test_progs -t test_ima
> > > ./test_progs: /usr/lib/libc.so.6: version `GLIBC_2.33' not found (required by ./test_progs)
> > >
> > > After:
> > >
> > > TRUNNER_LDFLAGS=-static ./vmtest.sh -- ./test_progs -t test_ima
> > > test_ima:OK
> > > Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
> > >
> > > Not using static as the default as some distros may not have dependent
> > > static libraries.
> > >
> > > Reported-by: "Geyslan G. Bem" <geyslan@xxxxxxxxx>
> > > Signed-off-by: KP Singh <kpsingh@xxxxxxxxxx>
> > > ---
> > > tools/testing/selftests/bpf/Makefile | 4 ++--
> > > tools/testing/selftests/bpf/vmtest.sh | 2 +-
> > > 2 files changed, 3 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> > > index fe12b4f5fe20..2473c9b0cb2e 100644
> > > --- a/tools/testing/selftests/bpf/Makefile
> > > +++ b/tools/testing/selftests/bpf/Makefile
> > > @@ -162,7 +162,7 @@ $(MAKE_DIRS):
> > >
> > > $(OUTPUT)/%.o: %.c
> > > $(call msg,CC,,$@)
> > > - $(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
> > > + $(Q)$(CC) $(CFLAGS) $(TRUNNER_LDFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
> > >
> > > $(OUTPUT)/%:%.c
> > > $(call msg,BINARY,,$@)
> > > @@ -468,7 +468,7 @@ $(OUTPUT)/$(TRUNNER_BINARY): $(TRUNNER_TEST_OBJS) \
> > > $(RESOLVE_BTFIDS) \
> > > | $(TRUNNER_BINARY)-extras
> > > $$(call msg,BINARY,,$$@)
> > > - $(Q)$$(CC) $$(CFLAGS) $$(filter %.a %.o,$$^) $$(LDLIBS) -o $$@
> > > + $(Q)$$(CC) $$(CFLAGS) $(TRUNNER_LDFLAGS) $$(filter %.a %.o,$$^) $$(LDLIBS) -o $$@
> > > $(Q)$(RESOLVE_BTFIDS) --btf $(TRUNNER_OUTPUT)/btf_data.o $$@
> > > $(Q)ln -sf $(if $2,..,.)/tools/build/bpftool/bootstrap/bpftool $(if $2,$2/)bpftool
> > >
> > > diff --git a/tools/testing/selftests/bpf/vmtest.sh b/tools/testing/selftests/bpf/vmtest.sh
> > > index e0bb04a97e10..a8bf6ceb3d06 100755
> > > --- a/tools/testing/selftests/bpf/vmtest.sh
> > > +++ b/tools/testing/selftests/bpf/vmtest.sh
> > > @@ -155,7 +155,7 @@ update_selftests()
> > > local selftests_dir="${kernel_checkout}/tools/testing/selftests/bpf"
> > >
> > > cd "${selftests_dir}"
> > > - ${make_command}
> > > + ${make_command} TRUNNER_LDFLAGS=-static
> >
> > In the commit message you mentioned we are not making it default for
> > everyone, Yet here making it default?
>
> I have already sent a v2, maybe you missed that
>
> https://lore.kernel.org/bpf/20220304150708.729904-1-kpsingh@xxxxxxxxxx/T/#u
>
> after noticing my mistake
>
> https://lore.kernel.org/bpf/CAJygYd1uwX05w3-+avZfz9d2a=8OD7VTMEv8Uo9AHLHrnu=k+Q@xxxxxxxxxxxxxx/T/#m1a3eedc831d8b27e5639b1d57e3af36a2b20f449
>
> > Also, do we need to add a new TRUNNER_LDFLAGS ? Why not just LDFLAGS,
> > we also use CFLAGS. Thinking ahead if we want add ASAN support later,
>
> Simple LDFLAGS and CFLAGS (not TRUNNER_*) did not work for me for some reason.
I think LDFLAGS are not wired properly everywhere. But have you tried
LDLIBS=-static ./vmtest.sh ?
In my case I can't get libcap.a to be installed in my system, so
compilation never completely succeeds, but I think it should get you
what you want
>
> > maybe add a switch to vmtest.sh for choosing flavor to run would be
> > better.
>
> I am not sure if we want to add a switch for everything. But I don't
> mind if folks think it would be useful.
>
> >
> >
> > >
> > > # Mount the image and copy the selftests to the image.
> > > mount_image
> > > --
> > > 2.35.1.616.g0bdcbb4464-goog
> > >
