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libfacedetection/CMakeLists.txt

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+# ============================================================================
+# libfacedetection —— 独立动态库 (SHARED)
+# 对外仅导出 facedetect_cnn (由 FACEDETECTION_EXPORT 标记)。
+# AVX/NEON 内联函数代码在此目标内编译，对应编译标志也只加到这里。
+# ============================================================================
+
+add_library(facedetection SHARED
+    src/facedetectcnn.cpp
+    src/facedetectcnn-model.cpp
+    src/facedetectcnn-data.cpp
+)
+
+# 对外头文件目录（PUBLIC：使用本库的目标会自动获得该 include 路径）
+target_include_directories(facedetection PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}/include
+)
+
+# 动态库符号可见性：默认隐藏，仅 FACEDETECTION_EXPORT 标记的符号导出。
+# CMake 会为 SHARED 目标自动定义 facedetection_EXPORTS，配合 facedetection_export.h 使用。
+set_target_properties(facedetection PROPERTIES
+    POSITION_INDEPENDENT_CODE ON
+    CXX_VISIBILITY_PRESET hidden
+    VISIBILITY_INLINES_HIDDEN ON
+)
+
+# ----------------------------------------------------------------------------
+# SIMD 加速：AVX/NEON 内联函数需要对应编译标志 + 宏定义
+# ----------------------------------------------------------------------------
+if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+    target_compile_options(facedetection PRIVATE -O3)
+
+    if(ENABLE_AVX512)
+        target_compile_options(facedetection PRIVATE
+            -mavx512f -mavx512cd -mavx512dq -mavx512bw -mavx512vl -mfma)
+        target_compile_definitions(facedetection PRIVATE _ENABLE_AVX512)
+        message(STATUS "libfacedetection: SIMD = AVX512")
+    elseif(ENABLE_AVX2)
+        target_compile_options(facedetection PRIVATE -mavx2 -mfma)
+        target_compile_definitions(facedetection PRIVATE _ENABLE_AVX2)
+        message(STATUS "libfacedetection: SIMD = AVX2")
+    elseif(ENABLE_NEON)
+        target_compile_definitions(facedetection PRIVATE _ENABLE_NEON)
+        # AArch64 下 NEON 默认开启无需标志；32 位 ARM 需要 -mfpu=neon。
+        if(CXX_HAS_MFPU_NEON)
+            target_compile_options(facedetection PRIVATE -mfpu=neon)
+        endif()
+        message(STATUS "libfacedetection: SIMD = NEON")
+    else()
+        message(STATUS "libfacedetection: SIMD disabled")
+    endif()
+elseif(MSVC)
+    target_compile_options(facedetection PRIVATE /O2)
+
+    if(ENABLE_AVX512)
+        target_compile_options(facedetection PRIVATE /arch:AVX512)
+        target_compile_definitions(facedetection PRIVATE _ENABLE_AVX512)
+    elseif(ENABLE_AVX2)
+        target_compile_options(facedetection PRIVATE /arch:AVX2)
+        target_compile_definitions(facedetection PRIVATE _ENABLE_AVX2)
+    elseif(ENABLE_NEON)
+        # MSVC for ARM: NEON 默认开启，无需额外标志。
+        target_compile_definitions(facedetection PRIVATE _ENABLE_NEON)
+    endif()
+endif()
+
+# OpenMP：加速卷积运算（可选）
+if(OpenMP_FOUND)
+    target_link_libraries(facedetection PRIVATE OpenMP::OpenMP_CXX)
+endif()