CMake、Ninja 和 Visual Studio 2019 重建一切

Question

我正在使用具有 CMake 支持和 Ninja 作为生成器的 Visual Studio 2019。每次我点击播放按钮进行调试时，VS 都会从头开始重建我的整个项目，甚至是库，即使我什至没有更改 main.cpp。我的项目是这样组织的

+--lib
|  +--demo
|     +--lib
|     |  + geometry
|     |  + [...]
|     +--include
|     |  + library.h
|     |  + library_other.h
|     +--src
|     |  + library.cpp
|     |  + library_other.cpp
|     +--CMakeLists.txt
+--src
|  +--main.cpp
+-- CMakeLists.txt

这是演示 CMakeLists.txt（我使用 vcpkg 来处理 glfw 和 freetype 等依赖项）

cmake_minimum_required (VERSION 3.10)
project(Demo)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

add_library (Demo 
    "src/library.cpp"
    "src/library_other.cpp"
)

target_include_directories(Demo
    PUBLIC
    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
    PRIVATE
    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
)

# Setup OpenGL and glew
target_compile_definitions(Demo PUBLIC DEMO_USE_OPENGL)
find_package(OpenGL REQUIRED)
find_package(GLEW 2.1 REQUIRED)
if (GLEW_FOUND)
    target_include_directories(Demo PRIVATE ${GLEW_INCLUDE_DIRS})
    target_link_libraries(Demo PRIVATE OpenGL::GL GLEW::GLEW)
endif()

# Link RtAudio
target_compile_definitions(Demo PUBLIC DEMO_USE_RTAUDIO)
target_compile_definitions(Demo PRIVATE __WINDOWS_DS__)
target_include_directories(Demo PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/lib/rtaudio)

# Link GLFW3
target_compile_definitions(Demo PUBLIC DEMO_USE_GLFW3)
find_package(glfw3 CONFIG REQUIRED)
target_link_libraries(Demo PRIVATE glfw)

# Third party libs
find_package(freetype CONFIG REQUIRED)
target_link_libraries(Demo PRIVATE freetype)
target_include_directories(Demo PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/lib/geometry/include)
target_include_directories(Demo PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/lib/utf8)
target_include_directories(Demo PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/lib/stb)
target_include_directories(Demo PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/lib/minimp3)
target_include_directories(Demo PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/lib/miniz)
target_include_directories(Demo PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/lib/entt)

# Enable UNICODE in windows)
target_compile_definitions(Demo PUBLIC UNICODE)
# Ensure UTF8 at runtime
string(APPEND CMAKE_CXX_FLAGS " /Zc:__cplusplus")
add_compile_options("$<$<C_COMPILER_ID:MSVC>:/utf-8>")
add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/utf-8>")

这里是主要的 CMakeLists.txt

cmake_minimum_required (VERSION 3.10)

project(DemoBase)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

add_subdirectory(lib/demo)

add_executable(DemoBase
    "src/main.cpp"
)

target_link_libraries(DemoBase)

add_custom_command(
    TARGET DemoBase POST_BUILD
    COMMAND ${CMAKE_COMMAND} -E copy_if_different
    "${PROJECT_SOURCE_DIR}/lib/demo/lib/glew/bin/glew32.dll"
    $<TARGET_FILE_DIR:DemoBase>
)

输出总是一样的：一切都重新编译

>------ Générer démarré : projet : CMakeLists, configuration : Debug ------
  [1/5] Building CXX object lib\demo\CMakeFiles\Demo.dir\src\library_other.cpp.obj
  [2/5] Building CXX object lib\demo\CMakeFiles\Demo.dir\src\library.cpp.obj
  [3/5] Linking CXX static library lib\demo\Demo.lib
  [4/5] Building CXX object CMakeFiles\DemoBase.dir\src\main.cpp.obj
  [5/5] Linking CXX executable DemoBase.exe

所以我的 CMake 文件中可能有一些东西每次都会触发重建，但我找不到什么。有什么办法可以避免重建所有东西，只重建这个项目已经改变的文件？

Answer 1

您可能指的是他们在最新更新中修复的 Visual Studio 2019 错误。

https://developercommunity2.visualstudio.com/t/VS2019-still-wipes-CMakeBuild-directory-/1142588

尝试更新到最新的更新版本

如果不是这种情况，请按照您的意思提供更多信息：

每次我点击播放按钮时，它都会重新构建整个项目，即使我没有更改代码中的任何内容。