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From: Ben Hutchings <benh@debian.org>
Date: Sun, 20 Apr 2025 18:50:44 +0200
Subject: libbpf: Use the standard fixdep build rule
libbpf's all target depends on the fixdep target defined in
tools/scripts/Makefile.include. However the $(BPF_IN_SHARED) and
$(BPF_IN_STATIC) targets don't use it, but instead rebuild fixdep in
the staticobjs or sharedobjs subdirectory using a different command.
Change the $(BPF_IN_SHARED) and $(BPF_IN_STATIC) targets to depend on
fixdep and to symlink the executable into the respective output
subdirectory.
Signed-off-by: Ben Hutchings <benh@debian.org>
---
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -134,7 +134,7 @@ all_cmd: $(CMD_TARGETS) check
$(SHARED_OBJDIR) $(STATIC_OBJDIR):
$(Q)mkdir -p $@
-$(BPF_IN_SHARED): force $(BPF_GENERATED) | $(SHARED_OBJDIR)
+$(BPF_IN_SHARED): fixdep force $(BPF_GENERATED) | $(SHARED_OBJDIR)
@(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
(diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
@@ -144,11 +144,11 @@ $(BPF_IN_SHARED): force $(BPF_GENERATED)
@(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
(diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true
- $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(SHARED_OBJDIR) $(SHARED_OBJDIR)fixdep
+ ln -sf ../fixdep $(SHARED_OBJDIR)/
$(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
-$(BPF_IN_STATIC): force $(BPF_GENERATED) | $(STATIC_OBJDIR)
- $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(STATIC_OBJDIR) $(STATIC_OBJDIR)fixdep
+$(BPF_IN_STATIC): fixdep force $(BPF_GENERATED) | $(STATIC_OBJDIR)
+ ln -sf ../fixdep $(STATIC_OBJDIR)/
$(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
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