@@ -1,6 +1,21 @@
# SPDX-License-Identifier: GPL-2.0-only
+
+# To link dynamically with libbpf run:
+# make LIBBPF_DYNAMIC=1
+# build will try to detect installed devel package of libbpf.
+#
+# For linking dynamically with libbpf installed at specific PATH run:
+# make LIBBPF_DYNAMIC=1 LIBBPF_DIR=<PATH>
+
include ../../scripts/Makefile.include
include ../../scripts/utilities.mak
+include ../../scripts/Makefile.arch
+
+ifeq ($(LP64), 1)
+ libdir_relative = lib64
+else
+ libdir_relative = lib
+endif
ifeq ($(srctree),)
srctree := $(patsubst %/,%,$(dir $(CURDIR)))
@@ -63,6 +78,17 @@ RM ?= rm -f
FEATURE_USER = .bpftool
FEATURE_TESTS = libbfd disassembler-four-args reallocarray zlib
FEATURE_DISPLAY = libbfd disassembler-four-args zlib
+ifdef LIBBPF_DYNAMIC
+ FEATURE_TESTS += libbpf
+ FEATURE_DISPLAY += libbpf
+
+ ifdef LIBBPF_DIR
+ LIBBPF_CFLAGS := -I$(LIBBPF_DIR)/include
+ LIBBPF_LDFLAGS := -L$(LIBBPF_DIR)/$(libdir_relative)
+ FEATURE_CHECK_CFLAGS-libbpf := $(LIBBPF_CFLAGS)
+ FEATURE_CHECK_LDFLAGS-libbpf := $(LIBBPF_LDFLAGS)
+ endif
+endif
check_feat := 1
NON_CHECK_FEAT_TARGETS := clean uninstall doc doc-clean doc-install doc-uninstall
@@ -88,6 +114,18 @@ ifeq ($(feature-reallocarray), 0)
CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
endif
+ifdef LIBBPF_DYNAMIC
+ ifeq ($(feature-libbpf), 1)
+ # bpftool uses non-exported functions from libbpf, so just add the dynamic
+ # version of libbpf and let the linker figure it out
+ LIBS := -lbpf $(LIBS)
+ CFLAGS += $(LIBBPF_CFLAGS)
+ LDFLAGS += $(LIBBPF_LDFLAGS)
+ else
+ dummy := $(error Error: No libbpf devel library found, please install libbpf-devel or libbpf-dev.)
+ endif
+endif
+
include $(wildcard $(OUTPUT)*.d)
all: $(OUTPUT)bpftool