cmake_minimum_required(VERSION 4.0)
project(pylibbpf)

add_subdirectory(pybind11)
pybind11_add_module(pylibbpf src/main.cpp)

# 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 install_uapi_headers
  BUILD_IN_SOURCE TRUE
  INSTALL_COMMAND ""
  STEP_TARGETS build)

if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "x86_64")
  set(ARCH "x86")
elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm")
  set(ARCH "arm")
elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "aarch64")
  set(ARCH "arm64")
elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "ppc64le")
  set(ARCH "powerpc")
elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "mips")
  set(ARCH "mips")
elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "riscv64")
  set(ARCH "riscv")
elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "loongarch64")
  set(ARCH "loongarch")
endif()

set(LIBBPF_INCLUDE_DIRS ${CMAKE_CURRENT_BINARY_DIR}/libbpf)
set(LIBBPF_LIBRARIES ${CMAKE_CURRENT_BINARY_DIR}/libbpf/libbpf.a)

# EXAMPLE_VERSION_INFO is defined by setup.py and passed into the C++ code as a
# define (VERSION_INFO) here.
target_compile_definitions(pylibbpf
                           PRIVATE VERSION_INFO=${EXAMPLE_VERSION_INFO})