From fcec64b3cc4c19bdb4b5d6c390ff26451a192d0d Mon Sep 17 00:00:00 2001
From: BeanCheeseBurrito <mrbeancheeseburrito@protonmail.com>
Date: Sun, 27 Oct 2024 21:28:51 -0700
Subject: [PATCH] Pass zig include headers to binding generator

---
 src/Directory.Build.props                     | 25 ++++++++++++++
 .../Flecs.NET.Bindgen.csproj                  | 22 ++++++++++++
 src/Flecs.NET.Bindgen/Program.cs              | 34 +++----------------
 src/Flecs.NET.Native/Flecs.NET.Native.csproj  | 26 --------------
 4 files changed, 52 insertions(+), 55 deletions(-)

diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index 1463b731..7f634308 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -25,4 +25,29 @@
         <Deterministic Condition="'$(GITHUB_ACTIONS)' == 'true' And '$(Deterministic)' == ''">true</Deterministic>
         <AllowedOutputExtensionsInPackageBuildOutputFolder Condition="'$(FlecsPackPdb)' == 'true'">$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
     </PropertyGroup>
+
+    <PropertyGroup>
+        <HostArch>$([System.Runtime.InteropServices.RuntimeInformation]::ProcessArchitecture)</HostArch>
+    </PropertyGroup>
+
+    <Choose>
+        <When Condition="$([MSBuild]::IsOSPlatform('Windows'))">
+            <PropertyGroup>
+                <HostRuntime Condition="'$(HostArch)' == 'X64'">win-x64</HostRuntime>
+                <HostRuntime Condition="'$(HostArch)' == 'Arm64'">win-arm64</HostRuntime>
+            </PropertyGroup>
+        </When>
+        <When Condition="$([MSBuild]::IsOSPlatform('Linux'))">
+            <PropertyGroup>
+                <HostRuntime Condition="'$(HostArch)' == 'X64'">linux-x64</HostRuntime>
+                <HostRuntime Condition="'$(HostArch)' == 'Arm64'">linux-arm64</HostRuntime>
+            </PropertyGroup>
+        </When>
+        <When Condition="$([MSBuild]::IsOSPlatform('OSX'))">
+            <PropertyGroup>
+                <HostRuntime Condition="'$(HostArch)' == 'X64'">osx-x64</HostRuntime>
+                <HostRuntime Condition="'$(HostArch)' == 'Arm64'">osx-arm64</HostRuntime>
+            </PropertyGroup>
+        </When>
+    </Choose>
 </Project>
diff --git a/src/Flecs.NET.Bindgen/Flecs.NET.Bindgen.csproj b/src/Flecs.NET.Bindgen/Flecs.NET.Bindgen.csproj
index bd7f57ef..eff1b9a1 100644
--- a/src/Flecs.NET.Bindgen/Flecs.NET.Bindgen.csproj
+++ b/src/Flecs.NET.Bindgen/Flecs.NET.Bindgen.csproj
@@ -13,6 +13,28 @@
 
     <ItemGroup>
         <PackageReference Include="Bindgen.NET" Version="0.1.14"/>
+        <PackageReference Include="Vezel.Zig.Toolsets.$(HostRuntime)" Version="0.13.0.1">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
     </ItemGroup>
 
+    <!-- Store the location of the zig lib folder as a global variable that can be accessed in code. -->
+    <ItemGroup>
+        <Compile Include="$(IntermediateOutputPath)BuildConstants.cs"/>
+    </ItemGroup>
+
+    <Target Name="GenerateConstants" BeforeTargets="CoreCompile">
+        <PropertyGroup>
+            <ConstantsFileContent>
+                $([MSBuild]::Escape('public static class BuildConstants { public const string ZigLibPath = "$(ZigLibPath)"; }'))
+            </ConstantsFileContent>
+        </PropertyGroup>
+
+        <WriteLinesToFile
+            File="$(IntermediateOutputPath)BuildConstants.cs"
+            Lines="$(ConstantsFileContent)"
+            Overwrite="true"/>
+    </Target>
+
 </Project>
diff --git a/src/Flecs.NET.Bindgen/Program.cs b/src/Flecs.NET.Bindgen/Program.cs
index b5e3b15a..d2b23a0a 100644
--- a/src/Flecs.NET.Bindgen/Program.cs
+++ b/src/Flecs.NET.Bindgen/Program.cs
@@ -23,7 +23,11 @@
 
     SuppressedWarnings = { "CS8981" },
 
-    IncludeBuiltInClangHeaders = true,
+    SystemIncludeDirectories =
+    {
+        Path.Combine(BuildConstants.ZigLibPath, "include"),
+        Path.Combine(BuildConstants.ZigLibPath, "libc", "include", "any-macos-any")
+    },
 
     InputFile = GetFlecsHeaderPath(),
     OutputFile = GetBindingsOutputPath(),
@@ -33,9 +37,6 @@
     GenerateStructEqualityFunctions = true
 };
 
-if (OperatingSystem.IsMacOS())
-    bindingOptions.SystemIncludeDirectories.Add(GetMacOsHeaders());
-
 BindingGenerator.Generate(bindingOptions);
 
 string GetFlecsHeaderPath([CallerFilePath] string filePath = "")
@@ -47,28 +48,3 @@ string GetBindingsOutputPath([CallerFilePath] string filePath = "")
 {
     return Path.GetFullPath(Path.Combine(filePath, "..", "..", "Flecs.NET.Bindings", "Flecs.g.cs"));
 }
-
-string GetMacOsHeaders()
-{
-    using Process process = new()
-    {
-        StartInfo = new ProcessStartInfo
-        {
-            FileName = "xcrun",
-            Arguments = "--sdk macosx --show-sdk-path",
-            RedirectStandardOutput = true,
-            UseShellExecute = false,
-            CreateNoWindow = true
-        }
-    };
-
-    process.Start();
-    process.WaitForExit();
-
-    string path = process.StandardOutput.ReadToEnd().Trim();
-
-    if (!Directory.Exists(path))
-        throw new DirectoryNotFoundException("Couldn't find system headers. Install XCode.");
-
-    return path + "/usr/include";
-}
diff --git a/src/Flecs.NET.Native/Flecs.NET.Native.csproj b/src/Flecs.NET.Native/Flecs.NET.Native.csproj
index af81d4ce..10c8fe90 100644
--- a/src/Flecs.NET.Native/Flecs.NET.Native.csproj
+++ b/src/Flecs.NET.Native/Flecs.NET.Native.csproj
@@ -20,10 +20,6 @@
         <Description>Native libraries for flecs</Description>
     </PropertyGroup>
 
-    <PropertyGroup>
-        <HostArch>$([System.Runtime.InteropServices.RuntimeInformation]::ProcessArchitecture)</HostArch>
-    </PropertyGroup>
-
     <!-- We want 2 separate natives packages for debug and release modes -->
     <Choose>
         <When Condition="'$(Configuration)' == 'Debug'">
@@ -40,28 +36,6 @@
         </When>
     </Choose>
 
-    <!-- As we are cross-compiling, RID != host runtime so we need to determine it for later -->
-    <Choose>
-        <When Condition="$([MSBuild]::IsOSPlatform('Windows'))">
-            <PropertyGroup>
-                <HostRuntime Condition="'$(HostArch)' == 'X64'">win-x64</HostRuntime>
-                <HostRuntime Condition="'$(HostArch)' == 'Arm64'">win-arm64</HostRuntime>
-            </PropertyGroup>
-        </When>
-        <When Condition="$([MSBuild]::IsOSPlatform('Linux'))">
-            <PropertyGroup>
-                <HostRuntime Condition="'$(HostArch)' == 'X64'">linux-x64</HostRuntime>
-                <HostRuntime Condition="'$(HostArch)' == 'Arm64'">linux-arm64</HostRuntime>
-            </PropertyGroup>
-        </When>
-        <When Condition="$([MSBuild]::IsOSPlatform('OSX'))">
-            <PropertyGroup>
-                <HostRuntime Condition="'$(HostArch)' == 'X64'">osx-x64</HostRuntime>
-                <HostRuntime Condition="'$(HostArch)' == 'Arm64'">osx-arm64</HostRuntime>
-            </PropertyGroup>
-        </When>
-    </Choose>
-
     <!-- Fallback to host runtime when not specified -->
     <PropertyGroup>
         <RuntimeIdentifier Condition="'$(RuntimeIdentifier)' == ''">$(HostRuntime)</RuntimeIdentifier>