Do not build lib/bpf/bpf.o with this Makefile but use the one from the
library directory. This avoid making a buggy bpf.o file (e.g. missing
symbols).
This patch is useful if some code (e.g. Landlock tests) needs both the
bpf.o (from tools/lib/bpf) and the bpf_load.o (from samples/bpf).
Signed-off-by: Mickaël Salaün <m...@digikod.net>
Cc: Alexei Starovoitov <a...@kernel.org>
Cc: Daniel Borkmann <dan...@iogearbox.net>
---
This is not a complet fix because the call to multi_depend with
$(host-cmulti) from scripts/Makefile.host force the build of bpf.o
anyway. I'm not sure how to completely avoid this automatic build
though.
---
samples/bpf/Makefile | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 7f61a3d57fa7..64335bb94f9f 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -201,13 +201,16 @@ CLANG_ARCH_ARGS = -target $(ARCH)
endif
# Trick to allow make to be run from this directory
-all:
+all: $(LIBBPF)
$(MAKE) -C ../../ $(CURDIR)/
clean:
$(MAKE) -C ../../ M=$(CURDIR) clean
@rm -f *~
+$(LIBBPF): FORCE
+ $(MAKE) -C $(dir $@) $(notdir $@)
+
$(obj)/syscall_nrs.s: $(src)/syscall_nrs.c
$(call if_changed_dep,cc_s_c)
--
2.15.1
