AppVeyor CI: Test build of Go bindings

appveyor.yml

@@ -14,18 +14,45 @@ environment:
 
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       GENERATOR: "Visual Studio 14 2015 Win64"
+
+    - GO: true
 cache:
   - C:\.hunter\_Base\Cache -> cmake\HunterConfig.cmake
 
-before_build: |
-  if not exist build mkdir build
-  cd build
-  cmake -G "%GENERATOR%" .. -DBUILD_SHARED_LIBS=ON -DEVMC_EXAMPLES=ON -DEVMC_TESTING=ON -DCMAKE_INSTALL_PREFIX=C:\install
+before_build:
+- ps: >-
+    if ($env:GENERATOR) {
+      if (!(test-path build)) { mkdir build }
+      cd build
+      cmake -G "$env:GENERATOR" .. -DBUILD_SHARED_LIBS=ON -DEVMC_EXAMPLES=ON -DEVMC_TESTING=ON -DCMAKE_INSTALL_PREFIX=C:\install
+    }
+
+build_script:
+- ps: >-
+    if ($env:GENERATOR) {
+      cmake --build . --config $env:CONFIGURATION --target install
+    }
+    elseif ($env:GO) {
+      $env:PATH = "C:\msys64\mingw64\bin;$env:PATH"
+      $env:GOPATH = "C:\Users\appveyor\go"
+
+      mkdir $env:GOPATH
+      gcc --version
+      go env
+      go get github.com/ethereum/go-ethereum/common
+
+      copy include/evmc/evmc.h bindings/go/evmc
+      copy include/evmc/helpers.h bindings/go/evmc
+      copy include/evmc/loader.h bindings/go/evmc
+      copy lib/loader/loader.c bindings/go/evmc
 
-build_script: |
-  cmake --build . --config %CONFIGURATION% --target install
+      go build ./bindings/go/evmc
+    }
 
-after_build: |
-  cd C:\projects\evmc\build\test
-  Release\evmc-test.exe
-  C:\install\bin\evmc-vmtester.exe C:\install\bin\evmc-examplevm.dll
+after_build:
+- ps: >-
+    if ($env:GENERATOR) {
+      cd C:\projects\evmc\build\test
+      Release\evmc-test.exe
+      C:\install\bin\evmc-vmtester.exe C:\install\bin\evmc-examplevm.dll
+    }