def cmake_tasks() {
    def tasks=[:]
    def steps = [[withCmake: true]]
    def os = "windows"
    def config = "Debug"
    def generator = "Ninja"

// ==== addidional env vars ====
    def vars="""
LIB=C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\LIB\\amd64;C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\ATLMFC\\LIB\\amd64;C:\\Program Files (x86)\\Windows Kits\\10\\lib\\10.0.17763.0\\ucrt\\x64;C:\\Program Files (x86)\\Windows Kits\\NETFXSDK\\4.6.1\\lib\\um\\x64;C:\\Program Files (x86)\\Windows Kits\\10\\lib\\10.0.17763.0um\\x64;
PATH=C:\\Program Files (x86)\\MSBuild\\14.0\\binamd64;C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\BIN\\amd64;C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319;C:\\Windows\\Microsoft.NET\\Framework64;C:\\Program Files (x86)\\Windows Kits\\10\\binx64;C:\\Program Files (x86)\\Windows Kits\\10\\binx86;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v10.0A\\bin\\NETFX 4.6.1 Tools\\x64;C:\\Program Files (x86)\\Common Files\\Oracle\\Java\\javapath;C:\\ProgramData\\Oracle\\Java\\javapath;C:\\CMake\\bin;c:\\windows\\system32;C:\\
 Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v7.0bin;C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v7.0libnvvp;g:\\Bin;
"""

// another variant, also does not affect CMake
//   vars = bat returnStdout: true, script: """
//@call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" amd64
//set
//"""

// third variant, also doesn't work
//    bat """call c:\Path\to\Visual\Studio\vcvarsall.bat    
//           set > build.props"""
//    var = readFile("build.props")

     def cmakeArgs = "-DARG=VALUE"
     def cmake_inst = 'InSearchPath'
     steps.add([envVars: vars])
     cmakeArgs = cmakeArgs + " -DCMAKE_C_COMPILER=cl -DCMAKE_CXX_COMPILER=cl -DCMAKE_MAKE_PROGRAM=g:\\Bin\\ninja"
     tasks["${os}"] = {
         node("${os}"){
             stage("${os}/${config}") {
                 withEnv([vars]){
                     if (os == "windows"){
                         bat "set | sort"
                         println vars
                         println steps
                     }
   
                     cmakeBuild(buildDir: "build_${config}",
                                buildType: config, 
                                cleanBuild: true,
                                cmakeArgs: cmakeArgs,
                                generator: generator,
                                installation: cmake_inst,
                                sourceDir: ".", 
                                steps: steps)
                }
            }
         }
      }
 
      return tasks
}
 
pipeline {
    agent none
    stages{
        stage('Configurte') {
            steps{
                script {
                    parallel cmake_tasks()
                }
            }
        }
    }
}
 

cmake_minimum_required(VERSION 3.12)
message(STATUS "LIB value = $ENV{LIB}")
message(STATUS "PATH value = $ENV{PATH}")

LIB value = 
PATH value = C:\\Program Files (x86)\\Common Files\\Oracle\\Java\\javapath;C:\\ProgramData\\Oracle\\Java\\javapath;C:\\CMake\\bin;c:\\windows\\system32;C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v7.0bin;C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v7.0\\libnvvp;g:\\Bin;