Add TryGetToolchain to build platform

#631

Source/Tools/Flax.Build/Build/Builder.Projects.cs

@@ -34,7 +34,7 @@ namespace Flax.Build
                         var platform = Platform.BuildPlatform;
                         var architecture = TargetArchitecture.AnyCPU;
                         var architectureName = "AnyCPU";
-                        var toolchain = platform.HasRequiredSDKsInstalled ? platform.GetToolchain(architecture) : null;
+                        var toolchain = platform.TryGetToolchain(architecture);
 
                         var configuration = TargetConfiguration.Debug;
                         var configurationName = "Debug";
@@ -113,7 +113,7 @@ namespace Flax.Build
                             if (platform is IProjectCustomizer customizer)
                                 customizer.GetProjectArchitectureName(project, platform, architecture, ref architectureName);
 
-                            var toolchain = platform.HasRequiredSDKsInstalled ? platform.GetToolchain(architecture) : null;
+                            var toolchain = platform.TryGetToolchain(architecture);
                             var targetBuildOptions = GetBuildOptions(target, platform, toolchain, architecture, configuration, project.WorkspaceRootPath);
                             var modules = CollectModules(rules, platform, target, targetBuildOptions, toolchain, architecture, configuration);
                             foreach (var module in modules)

Source/Tools/Flax.Build/Build/NativeCpp/Builder.NativeCpp.cs

@@ -954,7 +954,7 @@ namespace Flax.Build
                 throw new Exception($"Cannot build target {target.Name}. The project file is missing (.flaxproj located in the folder above).");
 
             // Setup build environment for the target
-            var targetBuildOptions = GetBuildOptions(target, platform, null, architecture, configuration, project.ProjectFolderPath, skipBuild ? string.Empty : Configuration.HotReloadPostfix);
+            var targetBuildOptions = GetBuildOptions(target, platform, platform.TryGetToolchain(architecture), architecture, configuration, project.ProjectFolderPath, skipBuild ? string.Empty : Configuration.HotReloadPostfix);
 
             using (new ProfileEventScope("PreBuild"))
             {
@@ -977,7 +977,7 @@ namespace Flax.Build
                 Target = target,
                 TargetOptions = targetBuildOptions,
                 Platform = platform,
-                Toolchain = null,
+                Toolchain = targetBuildOptions.Toolchain,
                 Architecture = architecture,
                 Configuration = configuration,
             };

Source/Tools/Flax.Build/Build/Platform.cs

@@ -183,6 +183,16 @@ namespace Flax.Build
             throw new Exception(string.Format("Platform {0} is not supported.", targetPlatform));
         }
 
+        /// <summary>
+        /// Tries to create the build toolchain for a given architecture. Returns null if platform is not supported.
+        /// </summary>
+        /// <param name="targetArchitecture">The target architecture.</param>
+        /// <returns>The toolchain.</returns>
+        public Toolchain TryGetToolchain(TargetArchitecture targetArchitecture)
+        {
+            return HasRequiredSDKsInstalled ? GetToolchain(targetArchitecture) : null;
+        }
+
         /// <summary>
         /// Creates the build toolchain for a given architecture.
         /// </summary>