CMake、Ninja 和 Visual Studio 2019 重建一切

如何解决CMake、Ninja 和 Visual Studio 2019 重建一切

我使用带有 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。我的项目是这样构建的

+--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新构建所有内容而只重新构建已随此项目更改的文件？

解决方法

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，请在此处提供更多信息：

每次我点击播放按钮时，它都会重建整个项目，即使我没有更改代码中的任何内容。