Test build of vcxproj files in CI

Build the Visual Studio project file and (re-)build CBMC using that
project file via msbuild.

Author: tautschnig

buildspec-windows.yml

@@ -32,6 +32,14 @@ phases:
         cmd /c 'call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x64 && bash -c "make -j4 -C jbmc/src setup-submodules" && bash -c "make CXX=clcache.exe -j4 -C jbmc/src BUILD_ENV=MSVC" '
         cmd /c 'call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x64 && bash -c "make CXX=clcache.exe -j4 -C jbmc/unit all BUILD_ENV=MSVC" '
 
+      - |
+        $env:Path = "C:\tools\cygwin\bin;c:\tools\clcache\clcache-4.1.0;$env:Path"
+        $env:CLCACHE_DIR = "C:\clcache"
+        $env:CLCACHE_BASEDIR = (Get-Item -Path ".\").FullName
+        cmd /c 'bash -c "cd scripts ; ./generate_vcxproj"'
+        $env:Path = "C:\Program Files (x86)\MSBuild\14.0\Bin;$env:Path"
+        msbuild /p:CLToolExe=clcache.exe /m:4 cbmc.vcxproj
+
       - |
         # display cache stats
         $env:Path = "C:\tools\cygwin\bin;c:\tools\clcache\clcache-4.1.0;$env:Path"