From: Andrii Nakryiko <andriin@fb.com>
Date: Fri, 11 Oct 2019 15:01:45 -0700
Subject: selftests/bpf: Enforce libbpf build before BPF programs are built
Patch-mainline: v5.5-rc1
Git-commit: 3fbe31ae7ec4ec284a908cef7218f19e951ee55b
References: bsc#1155518
Given BPF programs rely on libbpf's bpf_helper_defs.h, which is
auto-generated during libbpf build, libbpf build has to happen before
we attempt progs/*.c build. Enforce it as order-only dependency.
Fixes: 24f25763d6de ("libbpf: auto-generate list of BPF helper definitions")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191011220146.3798961-2-andriin@fb.com
Acked-by: Gary Lin <glin@suse.com>
---
tools/testing/selftests/bpf/Makefile | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -261,7 +261,8 @@ ifeq ($(DWARF2BTF),y)
$(BTF_PAHOLE) -J $@
endif
-$(OUTPUT)/%.o: progs/%.c
+# libbpf has to be built before BPF programs due to bpf_helper_defs.h
+$(OUTPUT)/%.o: progs/%.c | $(BPFOBJ)
($(CLANG) $(BPF_CFLAGS) $(CLANG_CFLAGS) -O2 -target bpf -emit-llvm \
-c $< -o - || echo "clang failed") | \
$(LLC) -march=bpf -mcpu=$(CPU) $(LLC_FLAGS) -filetype=obj -o $@