cmake可见性和AppArmor示例

cmake/visibility/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.15)
+project(visibility_demo CXX)
+set(CMAKE_CXX_STANDARD 17)
+
+# ============ color ============
+add_library(color
+    color/src/color.cpp
+    color/src/rgb_convert.cpp
+)
+target_include_directories(color
+    PUBLIC  color/public         # 对外头目录：用户由此 #include <color/color.h>
+    PRIVATE color/include        # 内部头目录：rgb_convert.h 只有 color 自己可见
+)
+# 宏出现在公开头文件的 #ifdef 里，决定 API 形状。
+# 若只标 PRIVATE：color.cpp 编译出了 brightColorCode，
+# 但用户看到的头文件里该声明被预处理掉 → 库和用户对 API 的理解不一致。
+target_compile_definitions(color PUBLIC COLOR_ENABLE_BRIGHT)
+
+# ============ timeutil ============
+add_library(timeutil timeutil/timeutil.cpp)
+target_include_directories(timeutil PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/timeutil)
+
+# ============ printer ============
+add_library(printer printer/src/printer.cpp)
+target_include_directories(printer PUBLIC printer/public)
+target_link_libraries(printer
+    PUBLIC  color                # printer.h 引用了 color/color.h → 契约的一部分
+    PRIVATE timeutil             # 只有 printer.cpp 用 → 实现细节
+)
+# 时间格式只影响 printer.cpp 的编译 → PRIVATE，不泄漏、改格式不触发下游重编
+target_compile_definitions(printer PRIVATE "PRINTER_TIME_FORMAT=\"%H:%M:%S\"")
+
+# ============ app ============
+add_executable(app app/main.cpp)
+target_link_libraries(app PRIVATE printer)