cmake_minimum_required(VERSION 3.16)
project(torrent_peer C)

set(CMAKE_C_STANDARD 11)
set(CMAKE_C_STANDARD_REQUIRED ON)

if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE Release)
endif()

# Fast by default; -march=native is great for local benchmarking. Disable with
# -DPEER_NATIVE=OFF for portable / CI builds.
option(PEER_NATIVE "Optimize for the build host (-march=native)" ON)
option(PEER_ASAN "Build with AddressSanitizer/UBSan" OFF)

add_library(torrentpeer SHARED
    src/engine.c
    src/loop.c
    src/connection.c
    src/transport.c
    src/transport_mse.c
    src/transport_utp.c
    src/crypto.c
    src/proto.c
    src/scheduler.c
    src/reqtab.c
    src/ring.c
    src/arena.c
    src/peer_compat.c
)
target_include_directories(torrentpeer PUBLIC include)

target_compile_options(torrentpeer PRIVATE
    -O3 -Wall -Wextra -Wno-unused-parameter
)
if(PEER_NATIVE AND NOT PEER_ASAN)
    target_compile_options(torrentpeer PRIVATE -march=native)
endif()
if(PEER_ASAN)
    target_compile_options(torrentpeer PRIVATE -O1 -g -fsanitize=address,undefined -fno-omit-frame-pointer)
    target_link_options(torrentpeer PRIVATE -fsanitize=address,undefined)
endif()

find_package(Threads REQUIRED)
target_link_libraries(torrentpeer PRIVATE Threads::Threads)

# P3a: link-time optimization for release builds (skipped under ASan).
option(PEER_LTO "Enable link-time optimization" ON)
if(PEER_LTO AND NOT PEER_ASAN)
    include(CheckIPOSupported)
    check_ipo_supported(RESULT _ipo_ok OUTPUT _ipo_msg)
    if(_ipo_ok)
        set_target_properties(torrentpeer PROPERTIES INTERPROCEDURAL_OPTIMIZATION ON)
    endif()
endif()

# Keep the .so name predictable for ctypes: libtorrentpeer.so
set_target_properties(torrentpeer PROPERTIES OUTPUT_NAME torrentpeer)