为什么我在 cmake 生成构建文件夹时缺少一些文件？ （玛雅 2020 - CMake 3.16.4 - VS 2017）

Question

我完全按照 API 帮助中的说明创建了 visual studio 项目： The CMakeLists.txt File guide

但是我得到了这个错误：

CMake Warning (dev) in CMakeLists.txt:
  No project() command is present.  The top-level CMakeLists.txt file must
  contain a literal, direct call to the project() command.  Add a line of
  code such as

    project(ProjectName)

  near the top of the file, but after cmake_minimum_required().

  CMake is pretending there is a "project(Project)" command on the first
  line.
This warning is for project developers.  Use -Wno-dev to suppress it.

顺便说一句，这个错误并没有停止进程，CMake 为我生成了构建文件夹 但正如您所见，它没有创建一些我认为的文件，没有 helloworld.vcxproj & helloworld.vcxproj.filters

仅供参考：我使用 Cmake 3.16.4 和 visual studio 2017

Answer 1

教程不完整，因为它缺少 project() 命令。您的 CMake 项目应该 always 至少有一个 project() 命令，因为它用于初始化一些非常重要的变量，以及 CMake 文件中使用的语言等等。来自 CMake 文档：

The top-level CMakeLists.txt file for a project must contain a literal, direct call to the project() command; loading one through the include() command is not sufficient. If no such call exists, CMake will issue a warning and pretend there is a project(Project) at the top to enable the default languages (C and CXX).

使用 set() 命令初始化 PROJECT_NAME 是不好的做法，因为 project() 调用 也 会为您完成此操作。我建议修改 CMake 文件以包含 project() 命令：

cmake_minimum_required(VERSION 2.8)

include($ENV{DEVKIT_LOCATION}/cmake/pluginEntry.cmake)

# Set the project here.
project(exampleNode)

set(RESOURCES_FILES myResource.xpm)

set(MEL_FILES 
     exampleNode.mel)

set(SOURCE_FILES
     exampleNode.cpp
     ${MEL_FILES}
)

set(LIBRARIES
    OpenMaya Foundation
)

find_package(MtoA)
find_alembic()
build_plugin()

Answer 2

这是正确的 CMakeLists.txt :

cmake_minimum_required(VERSION 2.8)
project(test)

set(PROJECT_NAME test)


include($ENV{DEVKIT_LOCATION}/cmake/pluginEntry.cmake)



set(RESOURCES_FILES myResource.xpm)

set(MEL_FILES 
    test.mel)

set(SOURCE_FILES
        test.cpp
        ${MEL_FILES}
    )

set(LIBRARIES
    OpenMaya Foundation
    )

build_plugin()