Setup development environment with libbpf

external/libbpf-bootstrap/examples/c/CMakeLists.txt

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+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(examples)
+
+# Tell cmake where to find BpfObject module
+list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../../tools/cmake)
+
+# Build vendored libbpf
+include(ExternalProject)
+ExternalProject_Add(libbpf
+  PREFIX libbpf
+  SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../libbpf/src
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND make
+    BUILD_STATIC_ONLY=1
+    OBJDIR=${CMAKE_CURRENT_BINARY_DIR}/libbpf/libbpf
+    DESTDIR=${CMAKE_CURRENT_BINARY_DIR}/libbpf
+    INCLUDEDIR=
+    LIBDIR=
+    UAPIDIR=
+    install
+  BUILD_IN_SOURCE TRUE
+  INSTALL_COMMAND ""
+  STEP_TARGETS build
+)
+
+# Set BpfObject input parameters -- note this is usually not necessary unless
+# you're in a highly vendored environment (like libbpf-bootstrap)
+set(BPFOBJECT_BPFTOOL_EXE ${CMAKE_CURRENT_SOURCE_DIR}/../../tools/bpftool)
+set(BPFOBJECT_VMLINUX_H ${CMAKE_CURRENT_SOURCE_DIR}/../../vmlinux/vmlinux.h)
+set(LIBBPF_INCLUDE_DIRS ${CMAKE_CURRENT_BINARY_DIR}/libbpf)
+set(LIBBPF_LIBRARIES ${CMAKE_CURRENT_BINARY_DIR}/libbpf/libbpf.a)
+find_package(BpfObject REQUIRED)
+
+# Create an executable for each application
+file(GLOB apps *.bpf.c)
+foreach(app ${apps})
+  get_filename_component(app_stem ${app} NAME_WE)
+
+  # Build object skeleton and depend skeleton on libbpf build
+  bpf_object(${app_stem} ${app_stem}.bpf.c)
+  add_dependencies(${app_stem}_skel libbpf-build)
+
+  add_executable(${app_stem} ${app_stem}.c)
+  target_link_libraries(${app_stem} ${app_stem}_skel)
+endforeach()