# ===== 目标平台 =====
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR aarch64)

# ===== 工具链路径 =====
set(TOOLCHAIN_DIR $ENV{HOME}/aarch64_env/toolchain)

if(NOT EXISTS "${TOOLCHAIN_DIR}")
    message(FATAL_ERROR "TOOLCHAIN_DIR not found: ${TOOLCHAIN_DIR}")
endif()

# ===== sysroot =====
set(CMAKE_SYSROOT ${TOOLCHAIN_DIR}/aarch64-linux-musl)

# ===== 编译器 =====
set(CMAKE_C_COMPILER   ${TOOLCHAIN_DIR}/bin/aarch64-linux-musl-gcc)
set(CMAKE_CXX_COMPILER ${TOOLCHAIN_DIR}/bin/aarch64-linux-musl-g++)

# ===== binutils（强烈推荐）=====
set(CMAKE_AR      ${TOOLCHAIN_DIR}/bin/aarch64-linux-musl-ar)
set(CMAKE_NM      ${TOOLCHAIN_DIR}/bin/aarch64-linux-musl-nm)
set(CMAKE_RANLIB  ${TOOLCHAIN_DIR}/bin/aarch64-linux-musl-ranlib)
set(CMAKE_STRIP   ${TOOLCHAIN_DIR}/bin/aarch64-linux-musl-strip)

# ===== 静态链接 =====
set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
set(BUILD_SHARED_LIBS OFF)

# ===== 查找规则（防止宿主污染）=====
set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)