119 lines
4.4 KiB
Markdown
119 lines
4.4 KiB
Markdown
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---
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title: 编写CMake实现构建多版本工程
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date: 2022-08-09 13:55:15
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tags: Maya CMake
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rating: ⭐️⭐️
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---
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# 编写CMake实现构建多版本工程
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1. 点击Configure与Generate根据当前年份与起始年份生成对应的子项目CMakeList.txt。
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2. 填入所要生成版本的Devkit路径。
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3. 再次点击Configure与Generate，即可生成项目。
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## 知识点
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### 变量共享
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在set中增加**CACHE**关键字就可以到主模块与子模块变量共享的目的。比如：
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> set("Maya${CURRENT_YEAR}_DEVKIT_LOCATION" "" CACHE PATH "")
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### 子模块
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调用**add_subdirectory**添加含有CMakeList.txt的文件夹即可。
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### CMake生成文件
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使用**file(GENERATE OUTPUT Path CONTENT Code)** 就可以生成文本文件了。这样就做到让CMake生成子CMakeList.txt的功能。代码如下（xxx为文本内容）：
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```cmake
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file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/Maya${CURRENT_YEAR}/CMakeLists.txt" CONTENT XXXX)
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```
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需要注意代码中的${}，需要将他们拆开放置它转义。
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### winsock库报错问题
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>在cmake里加上一行：**link_libraries(ws2_32)**
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或者在VisualStudio的Linker->Input->AdditionalDependencies中添加 Ws2_32.lib即可。
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## 具体代码
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具体代码如下：
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```cmake
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cmake_minimum_required(VERSION 3.24)
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project(DrivenByUE4)
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# 取得现在是XX年,之后计算Maya最新版本
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string(TIMESTAMP COMPILE_TIME %Y)
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math(EXPR THIS_YEAR "${COMPILE_TIME} + 1")
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set(START_YEAR 2018)
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set(CURRENT_YEAR "${START_YEAR}")
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# 生成设置变量
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while(CURRENT_YEAR LESS_EQUAL THIS_YEAR)
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set("Maya${CURRENT_YEAR}_DEVKIT_LOCATION" "" CACHE PATH "")
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set("Maya${CURRENT_YEAR}_LOCATION" "" CACHE PATH "")
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math(EXPR CURRENT_YEAR "${CURRENT_YEAR} + 1")
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# message(STATUS "result:${CURRENT_YEAR}")
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endwhile()
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# 不存在子项目则生成
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if(NOT EXISTS "${CMAKE_CURRENT_BINARY_DIR}/Maya${CURRENT_YEAR}/CMakeLists.txt")
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set(CURRENT_YEAR "${START_YEAR}")
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while(CURRENT_YEAR LESS_EQUAL THIS_YEAR)
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# 防止生成文件把${}进行转义
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set(ENV_String "$")
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string(APPEND ENV_String "ENV{PATH}")
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string(APPEND ENV_String "\$ENV")
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string(APPEND ENV_String "{MAYA_LOCATION}/bin;")
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set(ENV_String2 "$")
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string(APPEND ENV_String2 "ENV{DEVKIT_LOCATION}")
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set(ENV_String3 "$")
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string(APPEND ENV_String3 "{PROJECT_NAME}")
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# 因为生成文件会在Generate按钮按下后执行，所以需要执行2遍Configure与Generate
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file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/Maya${CURRENT_YEAR}/CMakeLists.txt" CONTENT
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"project(\"DrivenByUE4_Maya${CURRENT_YEAR}\")
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set(ENV{DEVKIT_LOCATION} \"${Maya${CURRENT_YEAR}_DEVKIT_LOCATION}\")
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set(ENV{MAYA_LOCATION} \"${Maya${CURRENT_YEAR}_LOCATION}\")
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set(ENV{PATH} \"${ENV_String}\")
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include(${ENV_String2}/cmake/pluginEntry.cmake)
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set(SOURCE_FILES
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../DBU_AddMesh.cpp
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../DBU_AddMesh.h
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../DBU_ScenePrimitiveCollector.cpp
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../DBU_ScenePrimitiveCollector.h
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../DBU_ControlCmd.cpp
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../DBU_ControlCmd.h
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../DBU_TCPSocket.cpp
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../DBU_TCPSocket.h
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../PluginRegister.cpp)
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set(LIBRARIES OpenMaya Foundation)
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set(PDB_OUTPUT_DIRECTORY ${Maya${CURRENT_YEAR}_DEVKIT_LOCATION}/plug-ins/plug-ins/DrivenByUE4.pdb)
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link_libraries(ws2_32)
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set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${Maya${CURRENT_YEAR}_DEVKIT_LOCATION}/plug-ins/plug-ins)
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set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG ${Maya${CURRENT_YEAR}_DEVKIT_LOCATION}/plug-ins/plug-ins)
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set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE ${Maya${CURRENT_YEAR}_DEVKIT_LOCATION}/plug-ins/plug-ins)
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set(VS_DEBUGGER_COMMAND ${Maya${CURRENT_YEAR}_LOCATION}/bin/mayabatch.exe)
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set(INCLUDE_DIRS \"\")
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set(DEVKIT_BASE_DIR \"${Maya${CURRENT_YEAR}_DEVKIT_LOCATION}\")
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set(LIBRARY_DIRS \"${Maya${CURRENT_YEAR}_DEVKIT_LOCATION}/lib\")
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set(Foundation_PATH \"${Maya${CURRENT_YEAR}_DEVKIT_LOCATION}/lib/Foundation.lib\")
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set(OpenMaya_PATH \"${Maya${CURRENT_YEAR}_DEVKIT_LOCATION}/lib/OpenMaya.lib\")
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build_plugin()
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set_target_properties(${ENV_String3} PROPERTIES OUTPUT_NAME \"DrivenByUE4\")")
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math(EXPR CURRENT_YEAR "${CURRENT_YEAR} + 1")
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endwhile()
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endif()
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set(CURRENT_YEAR "${START_YEAR}")
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while(CURRENT_YEAR LESS_EQUAL THIS_YEAR)
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if(NOT "${Maya${CURRENT_YEAR}_DEVKIT_LOCATION}" STREQUAL "" AND EXISTS "${CMAKE_CURRENT_BINARY_DIR}/Maya${CURRENT_YEAR}/CMakeLists.txt")
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add_subdirectory("Maya${CURRENT_YEAR}" "Maya${CURRENT_YEAR}")
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endif()
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math(EXPR CURRENT_YEAR "${CURRENT_YEAR} + 1")
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endwhile()
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```
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