Add support for an ExecutionModel property (Command/Reactor) for WebAssembly.

Author: alexrp

doc/configuration/properties.md

@@ -153,6 +153,8 @@ historical reasons.
 * `ReleaseMode` (`Fast`, `Safe`, `Small`): The
   [build mode](https://ziglang.org/documentation/master/#Build-Mode) to use when
   `Configuration` is set to `Release`. Defaults to `Fast`.
+* `ExecutionModel` (`Command`, `Reactor`): Specifies the execution model to use
+  when building WebAssembly executables. Defaults to `Command`.
 * `FastMath` (`true`, `false`): Enable/disable certain lossy floating point
   optimizations that may not be standards-compliant. Defaults to `false`.
 * `LinkTimeOptimization` (`true`, `false`): Enable/disable link-time

src/sdk/ZigCompile.cs

@@ -71,6 +71,13 @@ public string Configuration
     [Required]
     public bool EagerBinding { get; set; }
 
+    [Required]
+    public string ExecutionModel
+    {
+        get => _executionModel.ToString();
+        set => _executionModel = (ZigExecutionModel)Enum.Parse(typeof(ZigExecutionModel), value);
+    }
+
     [Required]
     public bool FastMath { get; set; }
 
@@ -196,6 +203,8 @@ public string SymbolVisibility
 
     private ZigConfiguration _configuration;
 
+    private ZigExecutionModel _executionModel;
+
     private int? _imageBase;
 
     private ZigOutputType _outputType;
@@ -251,7 +260,9 @@ protected override string GenerateCommandLineCommands()
         }
         else
         {
-            if (!TargetTriple.StartsWith("wasm", StringComparison.Ordinal))
+            if (TargetTriple.StartsWith("wasm", StringComparison.Ordinal))
+                builder.AppendSwitch($"-mexec-model={ExecutionModel.ToLowerInvariant()}");
+            else
                 builder.AppendSwitch("-fPIE");
 
             if (NoEntryPoint)

src/sdk/ZigExecutionModel.cs

@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: 0BSD
+
+namespace Vezel.Zig.Tasks;
+
+public enum ZigExecutionModel
+{
+    Command,
+    Reactor,
+}

src/sdk/build/Vezel.Zig.Sdk.Build.targets

@@ -64,6 +64,7 @@
                     DynamicImageBase="$(DynamicImageBase)"
                     EagerBinding="$(EagerBinding)"
                     EnvironmentVariables="ZIG_GLOBAL_CACHE_DIR=$(GlobalCachePath); ZIG_LOCAL_CACHE_DIR=$(LocalCachePath)"
+                    ExecutionModel="$(ExecutionModel)"
                     FastMath="$(FastMath)"
                     ImageBase="$(ImageBase)"
                     IncludeDirectories="@(IncludeDirectory)"

src/sdk/build/Vezel.Zig.Sdk.Defaults.targets

@@ -56,6 +56,7 @@
         <AllowUndefinedSymbols Condition="'$(AllowUndefinedSymbols)' == ''">false</AllowUndefinedSymbols>
         <DynamicImageBase Condition="'$(DynamicImageBase)' == ''">true</DynamicImageBase>
         <EagerBinding Condition="'$(EagerBinding)' == ''">true</EagerBinding>
+        <ExecutionModel Condition="'$(ExecutionModel)' == ''">Command</ExecutionModel>
         <FastMath Condition="'$(FastMath)' == ''">false</FastMath>
         <!-- TODO: https://github.com/vezel-dev/zig-sdk/issues/33 -->
         <LinkTimeOptimization Condition="'$(LinkTimeOptimization)' == ''">true</LinkTimeOptimization>

src/sdk/build/Vezel.Zig.Sdk.Test.targets

@@ -36,6 +36,7 @@
                     DynamicImageBase="$(DynamicImageBase)"
                     EagerBinding="$(EagerBinding)"
                     EnvironmentVariables="ZIG_GLOBAL_CACHE_DIR=$(GlobalCachePath); ZIG_LOCAL_CACHE_DIR=$(LocalCachePath)"
+                    ExecutionModel="$(ExecutionModel)"
                     FastMath="$(FastMath)"
                     ImageBase="$(ImageBase)"
                     IncludeDirectories="@(IncludeDirectory)"