[build] Add Azure build using cmake on Windows (#2588)

More people are starting to use this build, so make sure it doesn't break.
Also tests that build succeeds with OpenCV 4.

azure-pipelines.yml

@@ -23,6 +23,8 @@ trigger:
 stages:
 - stage: Build
   jobs:
+  - template: azure-templates/job-build-vcpkg.yml
+
   - template: azure-templates/job-build.yml
     parameters:
       jobName: Linux_Arm

azure-templates/job-build-vcpkg.yml

@@ -0,0 +1,26 @@
+jobs:
+- job: Windows_CMake
+  pool:
+    vmImage: 'windows-2019'
+
+  variables:
+    vcpkgGitRef: 544f8e4593764f78faa94bac2adb81cca5232943
+
+  steps:
+    - task: Cache@2
+      displayName: Cache vcpkg
+      inputs:
+        key: $(Build.SourcesDirectory)/azure-templates/vcpkg_x64-windows.txt | "$(vcpkgGitCommitId)" | "$(Agent.OS)"
+        path: '$(Build.BinariesDirectory)/vcpkg'
+    - task: run-vcpkg@0
+      displayName: Run vcpkg
+      inputs:
+        vcpkgArguments: '@$(Build.SourcesDirectory)/azure-templates/vcpkg_x64-windows.txt'
+        vcpkgGitCommitId: $(vcpkgGitRef)
+    - task: run-cmake@0
+      displayName: Build With CMake
+      inputs:
+        cmakeListsOrSettingsJson: 'CMakeListsTxtAdvanced'
+        vcpkgTriplet: '$(RUNVCPKG_VCPKG_TRIPLET)'
+        useVcpkgToolchainFile: true
+        cmakeAppendedArgs: '-DWITHOUT_JAVA=ON -DWITHOUT_ALLWPILIB=OFF -DWITHOUT_CSCORE=OFF'

azure-templates/vcpkg_x64-windows.txt

@@ -0,0 +1,3 @@
+--triplet
+x64-windows
+opencv

wpiutil/CMakeLists.txt

@@ -64,7 +64,11 @@ if (NOT WITHOUT_JAVA)
 
   execute_process(COMMAND python3 ${CMAKE_SOURCE_DIR}/wpiutil/generate_numbers.py ${CMAKE_BINARY_DIR}/wpiutil RESULT_VARIABLE generateResult)
   if(NOT (generateResult EQUAL "0"))
-    message(FATAL_ERROR "python3 generate_numbers.py failed")
+    # Try python
+    execute_process(COMMAND python ${CMAKE_SOURCE_DIR}/wpiutil/generate_numbers.py ${CMAKE_BINARY_DIR}/wpiutil RESULT_VARIABLE generateResult)
+    if(NOT (generateResult EQUAL "0"))
+      message(FATAL_ERROR "python and python3 generate_numbers.py failed")
+    endif()
   endif()
 
   set(CMAKE_JNI_TARGET true)
@@ -171,7 +175,7 @@ set_property(TARGET wpiutil PROPERTY FOLDER "libraries")
 
 target_compile_features(wpiutil PUBLIC cxx_std_17)
 if (MSVC)
-    target_compile_options(wpiutil PUBLIC /permissive- /Zc:throwingNew)
+    target_compile_options(wpiutil PUBLIC /permissive- /Zc:throwingNew /MP)
     target_compile_definitions(wpiutil PRIVATE -D_CRT_SECURE_NO_WARNINGS)
 endif()
 wpilib_target_warnings(wpiutil)