Attempt to find and add Clang include directory in UnixStdIncludeResolver

Author: Exanite

eng/silktouch/vulkan/settings.rsp

@@ -5,8 +5,6 @@ TODO_DEFINE_MACROS=HERE
 ../header.txt
 --include-directory
 ../../../submodules/vulkan-headers/include
-# TODO: Remove this
-/usr/lib/clang/20/include
 --with-callconv
 *=Winapi
 --with-librarypath

sources/SilkTouch/SilkTouch/Clang/UnixStdIncludeResolver.cs

@@ -1,13 +1,13 @@
 using System.Collections.Generic;
 using System.Linq;
+using System.Text.RegularExpressions;
 
 namespace Silk.NET.SilkTouch.Clang;
 
 /// <summary>
-/// Resolver for the C standard include paths on UNIX-like systems. On UNIX this is remarkably simple, it's just
-/// /usr/include and /usr/include/local.
+/// Resolver for the C standard include paths on UNIX-like systems.
 /// </summary>
-public class UnixStdIncludeResolver : IStdIncludeResolver
+public partial class UnixStdIncludeResolver : IStdIncludeResolver
 {
     private string[]? _ret = null;
 
@@ -18,7 +18,29 @@ public IEnumerable<string> GetStandardIncludes() =>
     /// <inheritdoc cref="GetStandardIncludes" />
     protected virtual IEnumerable<string> CoreGetStandardIncludes()
     {
+        // Add standard include directories
         yield return "-I/usr/include";
         yield return "-I/usr/local/include";
+
+        // Attempt to find and add clang include folder
+        if (Directory.Exists("/usr/lib/clang/"))
+        {
+            var clangIncludeFolder = Directory.GetDirectories("/usr/lib/clang/", "*", SearchOption.AllDirectories)
+                .Select(path => ClangIncludeFolderRegex().Match(path))
+                .Where(match => match.Success)
+                // Select the latest version
+                .OrderByDescending(match => int.Parse(match.Groups["Version"].Value))
+                .FirstOrDefault()
+                ?.Value;
+
+            if (clangIncludeFolder != null)
+            {
+                yield return $"-I{clangIncludeFolder}";
+            }
+        }
+
     }
+
+    [GeneratedRegex("^/usr/lib/clang/(?<Version>\\d+)/include$")]
+    private static partial Regex ClangIncludeFolderRegex();
 }