[PATCH] selftests/bpf: add LDFLAGS when building test_verifier

[PATCH] selftests/bpf: add LDFLAGS when building test_verifier

[Jisheng Zhang]

From: Jisheng Zhang <jszhang@kernel.org>

This is useful for cross compile process to point linker to the
correct libelf, libcap, libz path.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
---
 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 044bfdcf5b74..dac1c5094e28 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -447,7 +447,7 @@ verifier/tests.h: verifier/*.c
 		) > verifier/tests.h)
 $(OUTPUT)/test_verifier: test_verifier.c verifier/tests.h $(BPFOBJ) | $(OUTPUT)
 	$(call msg,BINARY,,$@)
-	$(Q)$(CC) $(CFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
+	$(Q)$(CC) $(CFLAGS) $(LDFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
 
 # Make sure we are able to include and link libbpf against c++.
 $(OUTPUT)/test_cpp: test_cpp.cpp $(OUTPUT)/test_core_extern.skel.h $(BPFOBJ)
-- 
2.31.0

Re: [PATCH] selftests/bpf: add LDFLAGS when building test_verifier

[Song Liu]

On Mon, Mar 29, 2021 at 11:13 AM Jisheng Zhang
<jszhang3@mail.ustc.edu.cn> wrote:
>
> From: Jisheng Zhang <jszhang@kernel.org>
>
> This is useful for cross compile process to point linker to the
> correct libelf, libcap, libz path.

LGTM:
Acked-by: Song Liu <songliubraving@fb.com>

btw: Do we also need LDFLAGS for some other binaries, like test_cpp,
TRUNNER_BINARY, etc?

Thanks,
Song

>
> Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
> ---
>  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 044bfdcf5b74..dac1c5094e28 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -447,7 +447,7 @@ verifier/tests.h: verifier/*.c
>                 ) > verifier/tests.h)
>  $(OUTPUT)/test_verifier: test_verifier.c verifier/tests.h $(BPFOBJ) | $(OUTPUT)
>         $(call msg,BINARY,,$@)
> -       $(Q)$(CC) $(CFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
> +       $(Q)$(CC) $(CFLAGS) $(LDFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
>
>  # Make sure we are able to include and link libbpf against c++.
>  $(OUTPUT)/test_cpp: test_cpp.cpp $(OUTPUT)/test_core_extern.skel.h $(BPFOBJ)
> --
> 2.31.0
>
>

Re: [PATCH] selftests/bpf: add LDFLAGS when building test_verifier

[Andrii Nakryiko]

On Mon, Mar 29, 2021 at 11:11 AM Jisheng Zhang
<jszhang3@mail.ustc.edu.cn> wrote:
>
> From: Jisheng Zhang <jszhang@kernel.org>
>
> This is useful for cross compile process to point linker to the
> correct libelf, libcap, libz path.

Is this enough to make cross-compilation of selftests/bpf work? I
think there was a discussion another day about cross-compiling
selftests/bpf, so I wonder if this is the only change that's needed to
make it work.

>
> Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
> ---
>  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 044bfdcf5b74..dac1c5094e28 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -447,7 +447,7 @@ verifier/tests.h: verifier/*.c
>                 ) > verifier/tests.h)
>  $(OUTPUT)/test_verifier: test_verifier.c verifier/tests.h $(BPFOBJ) | $(OUTPUT)
>         $(call msg,BINARY,,$@)
> -       $(Q)$(CC) $(CFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
> +       $(Q)$(CC) $(CFLAGS) $(LDFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
>
>  # Make sure we are able to include and link libbpf against c++.
>  $(OUTPUT)/test_cpp: test_cpp.cpp $(OUTPUT)/test_core_extern.skel.h $(BPFOBJ)
> --
> 2.31.0
>
>