message: Try to clean things up using ps instead of cmd
diff: @@ -11,31 +11,25 @@ platform:
  before_build:
  - del "C:\Program Files (x86)\MSBuild\14.0\Microsoft.Common.targets\ImportAfter\Xamarin.Common.targets"
  -- if not exist C:\projects\adios2build\NUL echo 'Build tree does not yet exist'
  -- set CUSTOM_BUILD_NAME=%APPVEYOR_PULL_REQUEST_HEAD_REPO_BRANCH%_%APPVEYOR_BUILD_NUMBER%_%APPVEYOR_BUILD_WORKER_IMAGE%
  -- ctest.exe
  - -VV -S ../adios2/scripts\appveyor\av_default.cmake
  +- ps: Write-Host "$env:APPVEYOR_BUILD_WORKER_IMAGE"
  +- ps: $env:CUSTOM_BUILD_NAME = ("{0}_{1}_{2}" -f $env:APPVEYOR_PULL_REQUEST_HEAD_REPO_BRANCH, $env:APPVEYOR_BUILD_NUMBER, $env:APPVEYOR_BUILD_WORKER_IMAGE -replace " ","-" )
  +- ctest.exe -VV -S ../adios2/scripts\appveyor\av_default.cmake
  -Ddashboard_full=OFF
  -Ddashboard_do_update=true
  -DCTEST_BUILD_NAME=%CUSTOM_BUILD_NAME%
  build_script:
  -- set CUSTOM_BUILD_NAME=%APPVEYOR_PULL_REQUEST_HEAD_REPO_BRANCH%_%APPVEYOR_BUILD_NUMBER%_%APPVEYOR_BUILD_WORKER_IMAGE%
  -- ctest.exe
  - -VV -S ../adios2/scripts\appveyor\av_default.cmake
  +- ctest.exe -VV -S ../adios2/scripts\appveyor\av_default.cmake
  -Ddashboard_full=OFF
  -Ddashboard_do_configure=true
  -DCTEST_BUILD_NAME=%CUSTOM_BUILD_NAME%
  -- ctest.exe
  - -VV -S ../adios2/scripts\appveyor\av_default.cmake
  +- ctest.exe -VV -S ../adios2/scripts\appveyor\av_default.cmake
  -Ddashboard_full=OFF
  -Ddashboard_do_build=true
  -DCTEST_BUILD_NAME=%CUSTOM_BUILD_NAME%
  test_script:
  -- set CUSTOM_BUILD_NAME=%APPVEYOR_PULL_REQUEST_HEAD_REPO_BRANCH%_%APPVEYOR_BUILD_NUMBER%_%APPVEYOR_BUILD_WORKER_IMAGE%
  -- ctest.exe
  - -VV -S ../adios2/scripts\appveyor\av_default.cmake
  +- ctest.exe -VV -S ../adios2/scripts\appveyor\av_default.cmake
  -Ddashboard_full=OFF
  -Ddashboard_do_test=true
  -DCTEST_BUILD_NAME=%CUSTOM_BUILD_NAME%
  