Added passage of VS Version selected at config time to the build (#886)

Fixes #815
Fixes #814

build/premake5.lua

@@ -9,6 +9,14 @@ dofile "LLVM.lua"
 
 solution "CppSharp"
 
+  buildconfig = io.open("../BuildConfig.cs", "w+")
+  io.output(buildconfig)
+  io.write("namespace CppSharp.Parser", "\n{\n    ")
+  io.write("public static class BuildConfig", "\n    {\n        ")
+  io.write("public const string Choice = \"" .. action .. "\";\n")
+  io.write("    }\n}")
+  io.close(buildconfig)
+
   configurations { "Debug", "Release" }
   platforms { target_architecture() }
 

src/Parser/ParserOptions.cs

@@ -14,8 +14,25 @@ namespace CppSharp.Parser
         public bool IsMicrosoftAbi { get { return Abi == CppAbi.Microsoft; } }
 
         /// Sets up the parser options to work with the given Visual Studio toolchain.
-        public void SetupMSVC(VisualStudioVersion vsVersion = VisualStudioVersion.Latest)
+        public void SetupMSVC()
         {
+            VisualStudioVersion vsVersion = VisualStudioVersion.Latest;
+            switch (BuildConfig.Choice)
+            {
+                case "vs2012":
+                    vsVersion = VisualStudioVersion.VS2012;
+                    break;
+                case "vs2013":
+                    vsVersion = VisualStudioVersion.VS2013;
+                    break;
+                case "vs2015":
+                    vsVersion = VisualStudioVersion.VS2015;
+                    break;
+                case "vs2017":
+                    vsVersion = VisualStudioVersion.VS2017;
+                    break;
+            }
+
             MicrosoftMode = true;
             NoBuiltinIncludes = true;
             NoStandardIncludes = true;

src/Parser/premake5.lua

@@ -6,7 +6,7 @@ project "CppSharp.Parser"
   language "C#"
   clr "Unsafe"
 
-  files { "**.cs" }
+  files { "**.cs", "../../BuildConfig.cs" }
   vpaths { ["*"] = "*" }
 
   links